RESEARCHES IN STELLAR PHOTOMETRY 
 
 DURING THE YEARS 1894 TO 190(5 
 
 MADE CHIEFLY AT THE 
 
 YERKES OBSERVATORY 
 
 BY 
 
 JOHN A. PARKHURST, S. ML, 
 
 Instructor in Practical Astronomy in the University of Chicago. 
 
 WASHINGTON, D. C. : 
 
 Published by the Carnegie Institution of Washington 
 October, 1906 
 
RESEARCHES IN STELLAR PHOTOMETRY 
 
 DURING THE YEARS 1894 TO 1906 
 
 MADE CHIEFLY AT THE 
 
 YERKES OBSERVATORY 
 
 BY 
 
 JOHN A. PARKHURST, S. M., 
 
 Instructor in Practical Astronomy in the University of Chicago. 
 
 WASHINGTON, D. C. : 
 
 Published by the Carnegie Institution of Washington 
 October, 1906 
 
^ 
 
 Attron. Deft, 
 
 CARNEGIE INSTITUTION OF WASHINGTON. 
 PUBLICATION No. )}. 
 
 DEFT i*- 
 
 PRESS OF GIBSON BROS., 
 WASHINGTON, D. C. 
 

 CONTENTS. 
 
 PAGB 
 
 Introduction, Plan of work, . i 
 
 Chapter i. Instruments 5 
 
 Chapter 2. 103 T Andromedae, 1 1 
 
 Chapter 3. 267 V Andromedae, 31 
 
 Chapter 4. 787 W Andromedae, 45 
 
 Chapter 5. 4315 R Comas, 59 
 
 Chapter 6. 5798 RU Herculis, 73 
 
 Chapter 7. 6100 RV Herculis 87 
 
 Chapter 8. 6894 S Lyrae, 103 
 
 Chapter 9. 7220 S Cygni, 117 
 
 Chapter 10. 7269 SX Cygni, 133 
 
 Chapter u. 7458 V Delphini 145 
 
 Chapter 12. 8518 Z Cassiopeiae, 161 
 
 Chapter 13. 8629 Y Cassiopeiae, 175 
 
 Chapter 14. General Conclusions, Precision of Measures, Limit of Vision, . . 187 
 
 960569 
 
INDEX TO TABLES AND FIGURES. 
 
 TABLES. 
 
 List of Variable Stars table i, page 
 
 Summary of Visual Observations 
 
 Absorption of Photometer Wedges 
 
 Limit of Vision of Telescopes J 
 
 Agreement of Magnitude Results for Standard Stars 
 " " " " Measured " 
 
 2, 
 3, 
 4, 
 
 "9, 
 "7, 
 118, 
 
 4 
 
 10 
 
 10 
 
 190 
 
 1 88 
 
 189 
 
 
 omedae. 
 
 to 
 o 
 u 
 
 romedae. 
 
 to 
 
 VI 
 
 \ 
 
 en 
 
 3 
 
 fij 
 
 
 B 
 M 
 
 'H 
 ' 
 
 K 
 'C 
 o. 
 _o 
 
 iopeiap. 
 
 
 M 
 
 o 
 c 
 
 1 
 
 o 
 
 E 
 o 
 
 X 
 
 W 
 
 8 
 
 X 
 
 X 
 
 o 
 
 S 
 
 rt 
 
 a 
 
 
 ! 
 
 3 
 
 ^ 
 
 
 
 p 
 
 > 
 
 >4 
 
 O 
 
 X 
 
 M 
 
 6 
 
 o 
 
 
 H 
 
 > 
 
 * 
 
 rt 
 
 rt 
 
 P) 
 
 03 
 
 w 
 
 w 
 
 > 
 
 N 
 
 _** 
 
 Standard Magnitude Stars. -J ~g^ 
 
 5 
 ii 
 
 15 
 32 
 
 24 
 46 
 
 33 
 59 
 
 43 
 73 
 
 52 
 87 
 
 61 
 103 
 
 70 
 117 
 
 80 
 
 8 9 
 146 
 
 99 
 161 
 
 108 
 
 175 
 
 Comparison Stars in B. D. (table 
 
 6 
 
 16 
 
 25 
 
 34 
 
 44 
 
 53 
 
 62 
 
 71 
 
 81 
 
 9 
 
 IOO 
 
 109 
 
 Catalogue ^ page 
 
 12 
 
 ""2 
 
 46 
 
 60 
 
 74 
 
 87 
 
 1 04 
 
 117 
 
 I -37 
 
 146 
 
 161 
 
 176 
 
 Notation, Positions, and (table 
 
 7 
 
 17 
 
 T 1 
 
 26 
 
 35 
 
 / T^ 
 
 45 
 
 / 
 
 54 
 
 Vf 
 
 63 
 
 72 
 
 * OO 
 
 82 
 
 * 1* 
 91 
 
 IOI 
 
 no 
 
 Magnitudes of Compar- < 
 
 
 
 
 
 
 
 
 
 
 
 
 
 ison Stars . (page 
 
 I 2 
 
 32 
 
 4.7 
 
 60 
 
 74 
 
 88 
 
 IO4 
 
 118 
 
 I "^4 
 
 147 
 
 162 
 
 176 
 
 Photometer Measures of J table 
 
 8 
 
 O"* 
 
 18 
 
 27 
 
 36 
 
 / *T 
 
 46 
 
 55 
 
 6 4 
 
 73 
 
 83 
 
 92 
 
 102 
 
 * / v 
 III 
 
 Comparison Stars .... i page 
 
 I "I 
 
 JA 
 
 
 60 
 
 
 88 
 
 
 118 
 
 
 148 
 
 162 
 
 177 
 
 Constants for Reduction (table 
 
 1 3 
 
 9 
 
 Of 
 
 19 
 
 28 
 
 37 
 
 47 
 
 56 
 
 65 
 
 74 
 
 8 4 
 
 lf.VJ 
 
 93 
 
 
 * / / 
 112 
 
 and Comparison with -.' 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Catalogue Magnitudes. . (page 
 
 '7 
 
 37 
 
 51 
 
 64 
 
 78 
 
 92 
 
 1 08 
 
 122 
 
 138 
 
 15' 
 
 1 66 
 
 1 80 
 
 Mean Magnitudes of Com- (table 
 
 IO 
 
 20 
 
 29 
 
 38 
 
 48 
 
 57 
 
 66 
 
 75 
 
 85 
 
 94 
 
 104 
 
 "3 
 
 parison Stars "< page 
 
 18 
 
 -,8 
 
 
 
 7O 
 
 Q-l 
 
 IOO 
 
 124 
 
 
 152 
 
 168 
 
 181 
 
 Visual Observations of the (table 
 
 ii 
 
 3^ 
 21 
 
 30 
 
 39 
 
 / y 
 49 
 
 :7J 
 
 58 
 
 67 
 
 * T^ 
 76 
 
 86 
 
 95 
 
 105 
 
 114 
 
 Variable * page 
 
 20 
 
 Q 
 
 
 66 
 
 81 
 
 QC 
 
 I IO 
 
 
 I J.O 
 
 T C 7 
 
 T 60 
 
 182 
 
 Mean Magnitudes of the (table 
 Variable from Grouped < 
 
 12 
 
 22 
 
 31 
 
 40 
 
 50 
 
 yo 
 
 59 
 
 68 
 
 77 
 
 !*(.!_ 
 
 87 
 
 A OO 
 
 96 
 
 **ry 
 
 106 
 
 "5 
 
 Observations (page 
 
 26 
 
 42 
 
 s6 
 
 7O 
 
 8s 
 
 IOO 
 
 114 
 
 129 
 
 143 
 
 157 
 
 172 
 
 185 
 
 Observed Maxima and f table 
 
 13 
 
 T" 
 
 23 
 
 32 
 
 / 
 41 
 
 J 
 
 51 
 
 60 
 
 
 78 
 
 88 
 
 98 
 
 107 
 
 116 
 
 Minima \ page 
 
 27 
 
 
 ^6 
 
 71 
 
 86 
 
 1 02 
 
 116 
 
 I IO 
 
 144 
 
 1 60 
 
 173 
 
 jg r 
 
 Measures by other Obser- (table 
 
 * / 
 
 
 
 / * 
 
 42 
 
 
 
 
 3 
 
 79 
 
 4 *T*T 
 
 97 
 
 
 
 vers 1 page 
 
 28 
 
 
 
 71 
 
 
 
 
 I ^O 
 
 
 I QQ 
 
 
 
 
 
 
 
 / * 
 
 
 
 
 * o 
 
 
 * Jy 
 
 
 
 FIGURES. 
 
 Photographic Chart opposite page 
 
 12 
 
 32 
 
 47 
 
 60 
 
 74 
 
 88 
 
 104 
 
 118 
 
 134 
 
 I 
 147 
 
 162 
 
 176 
 
 Magnitude-Curve . J %' 
 
 4 
 24 
 
 7 
 33 
 
 IO 
 
 13 
 6 4 
 
 16 
 
 80 
 
 '9 
 94 
 
 22 
 1 08 
 
 25 
 
 123 
 
 28 
 "38 
 
 31 
 
 IS' 
 
 34 
 167 
 
 37 
 1 80 
 
 (page 
 
 Light-Curve . - <fig " 
 
 5 
 25 
 
 8 
 
 43 
 
 1 1 
 
 55 
 
 '4 
 69 
 
 17 
 84 
 
 20 
 
 99 
 
 23 
 
 "3 
 
 26 
 
 128 
 
 29 
 142 
 
 32 
 156 
 
 35 
 171 
 
 38 
 184 
 
 ' (page 
 
 Mean Light -Curve. .. .. J***' 
 
 6 
 
 27 
 
 9 
 
 44 
 
 12 
 
 57 
 
 15 
 
 72 
 
 18 
 86 
 
 21 
 IOI 
 
 24 
 
 "5 
 
 27 
 130 
 
 30 
 143 
 
 33 
 158 
 
 36 
 172 
 
 39 
 1 86 
 
 ( page 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 BY JOHN A. PARKHURST. 
 
 INTRODUCTION. 
 
 The problems of stellar photometry are closely connected with many cosmic 
 questions, primarily with the light changes of variable stars; but they have an 
 equally important bearing on the questions of stellar distribution and evolution. 
 It has been said by good authorities that it is of more importance to measure 
 the light than the place of a star, and if one considers merely the astonishing 
 number of variable stars now being discovered, it will be admitted that the import- 
 ance of stellar photometry can scarcely be overestimated. The material here 
 submitted is the natural outgrowth of the writer's variable-star work, the plans 
 being extended as the instrumental and other facilities were improved. 
 
 The following contribution is offered towards the solution of several pho- 
 tometric problems, among them being: 
 
 (1) The accurate determination of complete light-curves of twelve variable 
 stars of long period, having faint minima. 
 
 (2) The question of the behavior of variable stars during their faint stages 
 which can only be observed with the largest apertures. 
 
 (3) The adaptation of the Pickering "equalizing wedge photometer" to the 
 determinations of magnitudes. 
 
 (4) The photometric measurement of very faint magnitudes, and their 
 relation to estimates founded on the limit of visibility of different apertures of 
 telescopes. 
 
 I wish to acknowledge here the efficient assistance rendered in the reductions 
 by Miss Kate Bloodgood, also by Mr. F. R. Sullivan of the observatory staff, who 
 recorded all the photometric measures made with the 4o-inch telescope. 
 
 HISTORICAL. 
 
 The writer's variable-star work began at Marengo, Illinois, in May, 1893, with 
 visual comparisons by Argelander's method of a list of long-period variables, 
 including at first the circumpolar stars in Professor E. C. Pickering's pamphlet, 
 "Variable Stars of Long Period, " published in 1891; with additions, from time 
 to time, of new variables which were not receiving sufficient attention elsewhere. 
 By the end of 1899 the number of observations amounted to about 5,000, fur- 
 nishing data for determining 162 maxima and n6 minima. Provisional results 
 were published in the Astronomical Journal, vols. 13 to 21, and in Popular Astron- 
 omy, vols. 2 to 8. This work was made possible largely by the kind assistance 
 of P. S. Yendell, of Dorchester, Massachusetts, who with great patience gave the 
 instructions needed by a beginner and corrected the errors into which one was 
 so likely to fall; also of Henry M. Parkhurst, of Brooklyn, New York, who, beside 
 
2 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 other assistance, made photographic copies of the forty Durchmusterung charts, 
 then out of print, making possible the finding of the newer variables and the iden- 
 \tiric : 8Jtj6n ; of the brighter comparison stars; and of Prof. E. C. Pickering, who 
 furnished "charts and photometric magnitudes of many of the comparison stars. 
 1 J0 "'' 'The instrument used so far was a 6. 5-inch reflector by Brashear, but connection 
 with the Yerkes Observatory for three months in 1898 and since January, 1900, 
 has made possible the extension of the work to the determination of the minima 
 of very faint stars, fixing the photometric magnitudes of the stars used for com- 
 parison, and making photographic charts of the fields surrounding the variables. 
 
 PLAN OF WORK. 
 
 Two points were determined from the start : ( i ) To follow the variables as far 
 as possible throughout their period; (2) to give special attention to the positions 
 and identifications of the comparison stars. To carry out the first point, prefer- 
 ence was given to circumpolar stars, which could be followed the year around. 
 To fulfill point 2, the coordinates of the comparison stars from the variable 
 were measured with a filar position micrometer, at first on the 6-inch, afterwards 
 for twenty fields with the 4o-inch for the faint stars. The completion of the 
 24-inch reflector in 1901 made it possible to accomplish this object much easier 
 and better by photography, so beginning in November of that year plates were 
 taken to show the faintest comparison stars used. 
 
 The addition of the Pickering equalizing wedge photometer to the outfit in 
 1900 made it possible to complete the plan of work by adding (3) the determina- 
 tion of the photometric magnitudes of the comparison stars, based on standard 
 stars which had been measured both at Harvard and Potsdam. The publication 
 of the Harvard catalogue and the approaching completion of the Potsdam work, 
 including all stars north of the equator to magnitude 7.5, furnished the basis 
 for this work, but it did more than that; it called for a minute comparison of 
 the two magnitude systems in conditions of practical work. It is not enough 
 to know the average differences between the two systems; the practical question 
 is, What systematic differences will be found in standards selected for a particular 
 field? To anticipate the results discussed in Chapter XIV it may be stated here 
 that the irregularities found in the systematic differences leave an outstanding 
 uncertainty of about o.i magnitude in stars as bright as 7.0. 
 
 ESSENTIALS FOR GOOD VISUAL COMPARISONS. 
 
 Among the precautions kept in mind to insure good visual comparisons, 
 the following were foremost : 
 
 (1) The two stars to be compared were made parallel to the line of the 
 eyes. To the writer this precaution was of the utmost importance, for if two 
 equal stars were placed in a vertical line the lower would appear more than half 
 a magnitude the brighter. The required position of the stars was easily secured 
 with the 6-inch reflector by turning the tube in its cradle. 
 
 (2) Two or three comparison stars were used at each observation if they 
 could be found in proper distances and magnitudes, though this rule often con- 
 flicted with the two following. 
 
INTRODUCTION. 3 
 
 (3) The stars to be compared should be in the same field, and 
 
 (4) The interval in brightness should be less than half a magnitude. If this 
 limit was exceeded the comparisons were weighted in the reductions, inversely 
 as the interval. 
 
 (5) Prejudice which would arise from anticipating the star's expected changes, 
 was avoided by postponing the reductions till the maximum or minimum was 
 completed. The observing list was long enough so that the previous observa- 
 tions were usually forgotten at the time of a comparison. 
 
 (6) The comparison of too bright stars was avoided by reducing the aper- 
 ture when necessary. 
 
 (7) Light in the eyes was avoided by using for recording a one-candlepower 
 incandescent lamp, so shielded as to illuminate faintly a circle one or two inches 
 in diameter on the record book. 
 
 ESSENTIALS FOR GOOD PHOTOMETER MEASURES. 
 
 Experience taught the necessity of close adherence to the following principles : 
 
 (1) A sky free from clouds and of uniform transparency is the prime requisite. 
 A "patchy" sky is a signal to stop photometric work. All observers agree to 
 this in theory, but their adherence to it is a variable quantity, yet it is doubtless 
 the largest single factor affecting the quality of the work. According to my 
 experience a lack of transparency amounting to a perceptible haziness is liable 
 to introduce a systematic error in the night's measures. This is not the "local" 
 error entering when distant regions, like polar and equatorial, are compared; 
 but it shows in measures of a field limited to one degree in diameter. 
 
 (2) Measures of a field should be repeated immediately, in inverse order from 
 the first set, to eliminate progressive changes (a) in the transparency of the air 
 and (6) in the brightness of the artificial star. Under (a), at least in the climate 
 of the northern Middle States, progressive change in the transparency of the air 
 is to be expected from hour to hour, and I suspect that this is true in all except 
 a few favored regions. Admitting this, the duty of repetition in inverse order 
 follows. The neglect of this apparently obvious precaution in most photometric 
 work is difficult to explain or justify. 
 
 (3) The real and artificial stars should resemble each other closely. This was 
 possible in the present work with the 6- and 1 2-inch telescopes, the stars being 
 usually indistinguishable, but it was not always possible with the 4O-inch. 
 
 (4) The stars to be compared should be in a uniform relative position. The 
 practice of the writer has been to place them in a horizontal line, with the real star 
 to the left of the artificial, and distant about 0.4 the space between the two images 
 of the artificial star. Following the principle mentioned under (i) in "Visual 
 comparisons ' ' this uniform position seemed preferable to the four recommended 
 by Professor Ceraski. 
 
 (5) Nothing but the photometer lamp should be in the circuit from the storage 
 cell supplying the current, and there should be no sliding contacts in the circuit; 
 all should be soldered or screwed. The lamp should burn very nearly at its 
 specified candlepower. 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 (6) At least three standard stars should be used in each series; the measures 
 of a field should be made on at least three nights; three settings of the pho- 
 tometer on each star (repeated as specified under (2), making six settings in all). 
 Experience convinced the writer that three settings were as good as four, with 
 the added advantage that three could be kept in mind and recorded at once. 
 
 (7) The use of too dark a shade glass (see Chapter I) should be avoided, a 
 change as great as two magnitudes in the background had an injurious effect 
 on the measures. 
 
 Table i gives the selected list of variable stars in whose fields the investi- 
 gations were conducted, with a summary from the following chapters of the periods 
 determined and the magnitudes at maxima and minima. The positions given 
 were (with the single exception of RU Herculis) measured with the filar microm- 
 eters on the 6- and 4O-inch telescopes. 
 
 Table 2 summarizes the visual observations of the variables, giving the num- 
 ber, limiting dates, and resulting number of maxima and minima. 
 
 TABLB i. LIST OF VARIABLE STARS. 
 
 Star. 
 
 1900. 
 
 Period. 
 
 M--m. 
 
 Range. 
 
 RightAscension. 
 
 Declination. 
 
 Max. 
 
 Min. 
 
 103 T Andromedae 
 
 km s 
 o 17 10.0 
 o 44 39-7 
 
 2 II 14. I 
 
 ii 59 8.4 
 16 6 2.7 
 16 56 44.7 
 19 9 6.3 
 
 20 3 24.7 
 
 20 II 33.2 
 
 20 43 13.6 
 23 39 39-9 
 23 58 13-8 
 
 919 
 
 + 26 26 27 
 
 + 35 6 30 
 + 43 50 26 
 + 19 20 19 
 
 + 25 19 56 
 + 31 22 18 
 + 25 50 17 
 + 57 4 1 52 
 + 3 45 58 
 + 18 58 i 
 + 56 i 33 
 + 55 7 25 
 
 d 
 284 
 259 
 396 
 361.8 
 484 
 
 200 
 438 
 326 
 409 
 529 
 492 
 4 IO 
 
 d 
 126 
 in 
 192 
 119 
 217 
 81 
 
 '54 
 162 
 
 173 
 161 
 
 '73 
 158 
 
 Mag. 
 
 8-5 
 9.0 
 
 7-5 
 8-5 
 7-5 
 9-7 
 
 IO.O 
 IO.O 
 
 9.0 
 
 8 
 
 IO.2 
 
 9-i 
 
 Mag. 
 13.0 
 14.0 
 13-8 
 14.0 
 14.0 
 
 15-3 
 15.0 
 16.7 
 14.0 
 17 
 15-2 
 14.0 
 
 267 V Andromeda 
 787 W Andromedae 
 
 5798 RU Herculis 
 
 6100 RV Herculis 
 
 
 7220 S Cygni 
 
 7269 SX Cygni 
 
 7458 V Delphini 
 
 8518 Z Cassiopeia . . . . 
 8629 Y Cassiopeiae 
 
 
 TABLE 2. SUMMARY OF VISUAL OBSERVATIONS OP THE VARIABLES. 
 
 Star. 
 
 Number 
 of obser- 
 vations. 
 
 Began 
 
 Ended 
 
 Number of 
 
 Max. 
 
 Min. 
 
 103 T Andromedae 
 
 173 
 109 
 
 75 
 132 
 136 
 
 55 
 no 
 
 100 
 
 75 
 140 
 
 IOO 
 IOO 
 
 1894 Mar. 
 1897 Jan. 
 1899 Feb. 
 1894 Mar. 
 1897 Jan. 
 1897 Aug. 
 1896 Oct. 
 1892 Dec. 
 1899 Oct. 
 1894 June 
 1898 Nov. 
 1898 Feb. 
 
 1905 Nov. 
 1905 Dec. 
 1905 Dec. 
 1905 Aug. 
 1905 Oct. 
 1905 Nov. 
 1905 Nov. 
 1905 Dec. 
 1905 Nov. 
 1905 Dec. 
 1905 Nov. 
 1905 Nov. 
 
 ii 
 10 
 6 
 
 8 
 6 
 
 H 
 
 8 
 
 9 
 
 5 
 7 
 4 
 
 7 
 
 12 
 IO 
 
 6 
 IO 
 
 6 
 
 13 
 6 
 8 
 
 5 
 6 
 
 4 
 7 
 
 267 V Andromedae 
 
 787 W Andromeda . . 
 
 4315 R Comae 
 
 5798 RU Herculis . .. . 
 
 6100 RV Herculis 
 
 6894 S Lyrae 
 
 7220 S Cygni 
 
 7269 SX Cygni . . 
 
 7458 V Delphini 
 
 8518 Z Cassiopeiae 
 
 8629 Y Cassiopeiae . . 
 
 Total 
 
 1,405 
 
 95 
 
 93 
 
 
 
 
STELLAR PHOTOMETRY. 
 
 PLATE 1 
 
 EQUALIZING WEDGE PHOTOMETER ON 4O-iNcn TELESCOPE. 
 
CHAPTER I. 
 
 INSTRUMENTS. 
 
 The visual and photometric work was done with three different telescopes, 
 of 6, 12 and 40 inches aperture, thus making it possible to follow the variable 
 stars throughout their cycles, and to measure the magnitudes of all the comparison 
 stars needed. The lack of homogeneity in the visual comparisons, resulting from 
 the use of such different apertures, could not be avoided, but its harmful effect 
 was kept within limits by the use of the photometric magnitudes of the com- 
 parison stars. 
 
 The 6-inch reflecting telescope, made by Brashear, is provided with driving 
 clock, circles (the hour circle movable), and rotating tube, making zenith observa- 
 tions comfortable, also making it possible to bring the line of the two stars com- 
 pared parallel with the line of the eyes, a matter of prime importance in visual 
 work. Standard stars from the Harvard and Potsdam catalogues, chosen between 
 the 6th and 8th magnitudes, could be matched in brightness by the artificial 
 star of the photometer. If brighter than the yth magnitude the shade glass was 
 used, its cell being hinged so that it could be turned into the cone of rays between 
 the ocular and the flat. The visual limit of the 6-inch with a power of 150 is 
 about 13.0 (see p. 10), but with the power of 40 used with the photometer it was 
 not possible to make accurate measures of stars fainter than i i.o, while in practice 
 the stars measured were between 8 and 10. 
 
 The i2-inch Brashear refractor and the 4o-inch Clark refractor of the Yerkes 
 Observatory need no special description. Their visual limits are about 14.5 and 
 17.0 magnitude, respectively. In the photometric work the greatest accuracy is 
 secured by connecting with the 1 2-inch, standards between 8th and gth magnitude 
 with measured stars of about the i2th magnitude, then with the 4O-inch to pass 
 from the i2th magnitude to the faintest stars possible, about the i6th magnitude. 
 
 THE EQUALIZING WEDGE PHOTOMETER AND THE DETERMINATION OF THE 
 ABSORPTION OF ITS WEDGE. 
 
 In pursuance of a plan for cooperation in determining standards for faint 
 stellar magnitude, Prof. E. C. Pickering sent to the Yerkes Observatory in April, 
 1900, one of the five wedge photometers which he had devised for the work. This 
 was to be used with the 4O-inch refractor in the measurement of the faintest stars 
 included in the plan. The construction of the instrument is shown in fig. i and 
 Plate i. The tube T, carrying the ocular O, slides into the tailpiece of the 
 telescope. At right angles to this is the tube C, carrying the essential parts of 
 the photometer. The light from a one-candlepower incandescent lamp L shines 
 through a minute hole in the diaphragm D upon a piece of ground glass G, forming 
 
 5 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 an artificial star. In contact with G is a piece of blue glass to render the light 
 of the star less yellow. An image of this star is thrown by the projecting lens 
 P upon a plate of plane-parallel glass B and reflected 
 from both surfaces into the focus of the ocular 0, forming 
 at E and F two images of the artificial star. Interposed 
 in the path of these rays is the photographic wedge W, 
 movable at right angles to C by the rack and pinion R . 
 The short tube carrying the ground glass G is movable away 
 from the diaphragm D by means of the head of the screwS, 
 projecting through an inclined slot in the farther side of 
 the tube C. By this means the artificial star can be made 
 larger and less sharply defined , thus resembling more closely a 
 real star under different atmospheric conditions. Finally, 
 a pair of shade glasses at A can be moved, either both or 
 singly, into the path of the rays. 
 
 In photometers made on this principle the all-important 
 condition to be fulfilled is that the images of the real and 
 artificial stars should closely resemble each other. The 
 range of adjustment of the ground glass G was found to be 
 insufficient to meet this condition with the different tele- 
 scopes on which the photometer was to be used ; therefore 
 the diaphragm D, originally provided, which had a single 
 aperture 0.17 mm. in diameter was replaced with a movable 
 
 d iaphragm 
 carrying four 
 apertures , 
 o. i o, 0.15, 
 o. 2 o, and 
 0.25 mm. in 
 diameter. By 
 choosing the 
 most suitable 
 aperture and 
 c ombining 
 with it a slight 
 movement of 
 the ground 
 glass, it was 
 possible to 
 give the disk 
 of the artifi- 
 
 Scale - in thes 
 FIG. i. SECTION OF PHOTOMETER. 
 
 cial star any required size and sharpness to suit the various telescopes used and 
 the different atmospheric conditions. With few exceptions the hole 0.15 was used 
 with the 6- and 1 2-inch and 0.20 with the 4O-inch. 
 
CHAPTER I. INSTRUMENTS. 7 
 
 In order to use the photometer with a 6.5-inch reflector, a smaller tube was 
 provided carrying an ocular and a diagonal reflecting plate to replace B. After 
 several trials good images of the real and artificial stars were given by a diagonal 
 plate with surfaces correct to one-tenth of a wave-length, furnished by Mr. O. L. 
 Petitdidier, of Chicago. 
 
 FIG. 2. CURVE A 12. ABSORPTION OK WEDGE V ON 12- ANI^O-INCH REFRACTORS. 
 
 The use of the instrument is very simple and convenient. The image of the 
 star to be measured (shown at H in the drawing) is brought between the two 
 images of the artificial star, and the wedge is moved by the pinion R till the light 
 of the real star is matched by E, the image formed by reflection from the first 
 surface of the plate B. The position of the wedge is then read on a scale divided 
 to twenty-fifths of an inch, tenths of a division being estimated. If now the 
 light of a star of known magnitude be measured, the only unknown quantity is 
 the absorption of the wedge, expressed in magnitudes. 
 
8 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 The methods available for determining the wedge absorption can be classed 
 under two heads: (i) Measurements of standard stars whose magnitudes have 
 been well fixed; (2) measurements of an artificial star whose light can be reduced 
 by a known amount either by (a) polarization, (6) a revolving wheel, (c) reduced 
 apertures by stationary diaphragms. The last method can be used either with 
 real or artificial stars. The method by standard stars seems to give the best 
 results, as it has the great advantage that the measurements are made under 
 the same conditions as exist in practice. 
 
 MAON1TUOC 
 
 FIG. 3. CURVE E 6. ABSORPTION OF WEDGE V ON 6-iNcn REFLECTOR. 
 
 The errors which may be introduced by the neglect of this precaution are dealt 
 with by King in Harvard Annals, 41, pages 237 et seq., where it was found that 
 the mean absorption corresponding to one scale division was 0.090 with the wedge 
 almost in contact with the aperture, and 0.130 with the wedge 5 cm. from the aper- 
 ture. Again, it was found by Aitken and Maddrill (Astrophysical Journal, 22, 147) 
 that the absorption measured with a Lummer-Brodhun photometer, comparing 
 surfaces, must be increased by one-quarter to equal the results obtained from stand- 
 
CHAPTER I. INSTRUMENTS. 9 
 
 ard stars. To avoid these sources of error, wedge V, which was used in nearly all 
 the measures here considered, was calibrated by the three following methods, 
 in all of which the wedge was placed in situ, and the conditions in actual practice 
 quite exactly used 1 : 
 
 (1) Standard Pleiades stars, 2,700 settings. 
 
 (2) Comparison with Zollner photometer, 3,000 settings. 
 
 (3) Comparison with "wheel" photometer, 500 settings. 
 
 Full details of this calibration will be published in connection with the work 
 on "Determination of Standards for Faint Stellar Magnitude;" but in this con- 
 nection a comparison of the results by the three methods will give the quantities 
 used in the reductions and at the same time enable the reader to form an opinion 
 of the degree of accuracy attained . 
 
 (1) The standard Pleiades stars were measured with both the 6- and 1 2-inch 
 telescopes, and the platted measures give the absorption in the second column of 
 Table 3. 
 
 (2) The Zollner polarizing photometer was set up in a dark room opposite the 
 wedge photometer, and the artificial stars compared, first by projecting the 
 Zollner star into the wedge, second by projecting the wedge star into the Zollner. 
 The mean of these closely accordant results gives the absorptions in the third 
 column of Table 3. 
 
 (3) The wedge star was compared with an artificial star cut down by a revolv- 
 ing wheel provided with sectors, giving the quantities in the fourth column. 
 
 The weighted mean of these three determinations gives the values in column 
 five, which are points in the absorption curve corresponding to the scale readings 
 in the first column. This curve is called A 12, and is used in the reductions of 
 the 12- and 40-inch measures. 
 
 Since another ocular and diagonal plate was used in the 6-inch measures, 
 and the appearance of the star images, both real and artificial, was different, 
 it was not considered allowable to assume that the absorption curve would be 
 the same; therefore the measures of the Pleiades stars were repeated with the 
 6-inch and the comparison with the Zollner photometer was made with the same 
 arrangement of apparatus as used on the 6-inch. The absorption curve found, 
 called E 6, is shown by column six to differ enough from A 12 to justify the 
 separate investigation, and at the same time to confirm the general features of 
 the curve A 12. 
 
 A few measures of faint stars were made in 1900 with wedge II, whose 
 absorption curve derived from standard stars and the "wheel," is given by 
 points in the last column of the table. 
 
 The question of the trustworthiness of the adopted absorption curve is of the 
 highest importance in this work, and demands the most rigid scrutiny. The 
 
 1 A fourth comparison with another polarizing photometer has since given identically the same 
 absorption curve. 
 
10 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 evidence in Table 3 may be summed up as follows: (i) The results by two inde- 
 pendent methods, standard stars and laboratory measures, are in good agreement ; 
 the average probable error of the points platted on curve A 12 being less than 
 0.03, with a maximum of 0.07. (2) The laboratory measures were all made 
 by matching artificial stars which closely resembled the real stars. 
 
 TABLE 3. ABSORPTION OP WEDGES II AND V. 
 
 
 Wedge V. 
 
 Wedge II. 
 
 Scale. 
 
 12-inch. 
 
 6-inch. 
 
 
 
 Pleiades. 
 
 Zollner. 
 
 Wheel. 
 
 A 12. 
 
 E 6. 
 
 
 60 
 
 (5.8o) 
 
 
 
 (5-49) 
 
 
 
 55 
 
 5-34 
 
 5-12 
 
 
 5.22 
 
 
 5-32 
 
 50 
 
 4'85 
 
 4.76 
 
 
 4.80 
 
 4.70 
 
 4-99 
 
 45 
 
 4 39 
 
 4.28 
 
 4.28 
 
 4.33 
 
 4.41 
 
 4.51 
 
 40 
 
 3.80 
 
 3-77 
 
 3-77 
 
 3.78 
 
 3.85 
 
 3-93 
 
 35 
 
 3.14 
 
 3-27 
 
 3 .20 
 
 3 '9 
 
 3 30 
 
 3-35 
 
 30 
 
 2.60 
 
 2-74 
 
 2.61 
 
 2.65 
 
 2.68 
 
 2.85 
 
 25 
 
 2 15 
 
 2.27 
 
 (2.18) 
 
 2. 2O 
 
 2. 13 
 
 2.27 
 
 20 
 
 1.6 5 
 
 i. 80 
 
 (1-74) 
 
 1.72 
 
 i .59 
 
 i-5i 
 
 15 
 
 1.0 7 
 
 i. 08 
 
 1.07 
 
 1.06 
 
 0.93 
 
 0.72 
 
 IO 
 
 0.46 
 
 0.42 
 
 0.50 
 
 o 43 
 
 0.28 
 
 O. II 
 
 5 
 
 
 0.06 
 
 
 0.05 
 
 (o.oo) 
 
 
 o 
 
 
 O.O2 
 
 
 (o.oi) 
 
 
 
 A check on the mean value of the absorption is furnished by the measured 
 magnitudes of the stars near the limit of vision of the 6-inch telescope. Table 
 4 gives the field, the estimate of the limit of vision, the photometric magnitude 
 of the limit, the correction for atmospheric extinction, and the final corrected 
 magnitude of the limit, expressed in both the Harvard and Potsdam systems. 
 
 TABLE 4. 
 
 FiVlH 
 
 
 M 
 
 lg- 
 
 
 Corr 
 
 Mag. 
 
 
 
 H. 
 
 P. 
 
 
 H. 
 
 P. 
 
 Z Cassiopeia 
 
 k 
 
 
 12 88 
 
 
 
 
 W Lyra: 
 
 2--?<l 
 
 
 
 
 J 3-03 
 
 
 S Lyrse 
 
 z 
 
 12 82 
 
 
 
 
 12.93 
 
 SX Cygni 
 
 -j<n 
 
 
 
 
 
 13.24 
 
 RU Herculis 
 
 2<n 
 
 
 
 
 12 -34 
 
 
 V Cassiopeia 
 
 Q 
 
 
 
 
 13.07 
 
 J 3 34 
 
 
 
 
 
 
 
 12.97 
 
 Mean 
 
 
 
 
 
 
 
 
 
 
 
 
 12.75 
 
 
CHAPTER II. 
 
 R. A. oh 
 
 103 T ANDROMEDA. 
 io.o s ; Dec. +26 26' 27" (1900). 
 
 The variability of this star was discovered by Anderson in 1 893 and observations 
 began soon after the receipt of the Astronomische N achrichten No. 3202 contain- 
 ing the announcement. The literature concerning the star is given so completely 
 in the forthcoming catalogue of the Gesellschaft committee, that it is unnecessary 
 to repeat it here. The light changes are unusually regular, the maxima and minima 
 being both well denned. At present the period seems to be lengthening. 
 
 The comparison stars have been measured with the photometer, the residuals 
 being: For the catalogue stars, 0.03; for the stars measured with the 6-, 12-, 
 and 4o-inch, respectively, 0.08, 0.09, and 0.11 magnitude. 
 
 Detailed explanations follow for the tables and figures giving the photometric 
 and visual results for this star. For the other eleven variable stars given in 
 Chapters III to XIII explanations are only given for the few particulars in 
 which the tables differ from those for T Andromedae. The arrangement of 
 the tables is as follows : First, the data for the identification of the comparison 
 stars with a summary of the magnitude results used in the reductions, Tables 5,6, 
 and 7; second, the photometric measures in detail, Table 8; third, reduction 
 constants and summary of photometric results, Tables 9 and 10; fourth, visual 
 observations of the variable, with reductions to photometric magnitude, and 
 residuals from the mean light -curve, Table 1 1 ; fifth, data for formation of 
 mean light-curve, with residuals for the twelve parts of each separate curve, 
 Table 12; sixth, observed maxima and minima, Table 13. 
 
 TABLE 5. STANDARD MAGNITUDE STARS. 
 
 Star. 
 
 B. D. No. 
 
 1900. 
 
 Color 
 P. DM. 
 
 Magnitude. 
 
 Residuals. 
 
 R. A. 
 
 Dec. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nights 
 inter 
 se. 
 
 H. C. O. 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 A 
 B 
 a 
 
 O 
 
 + 25 34 
 + 25 29 
 + 26 40 
 
 Mean .... 
 
 h m s 
 o 14 10 
 o 13 18 
 o 16 18 
 
 O t 
 
 + 25 54-7 
 + 25 36. i 
 + 26 23.7 
 
 GW+ 
 
 W+ 
 WG+ 
 
 7.67 
 7.21 
 
 8.20 
 
 7.76 
 7.42 
 
 8.12 
 
 7.6: 
 
 7-47 
 7.98 
 
 7.69 
 
 7 55 
 8.06 
 
 - 6 
 + 26 
 
 22 
 
 - 7 
 + 13 
 - 6 
 
 4 
 
 2 
 
 3 
 
 7.69 
 
 7-77 
 
 7.69 
 
 7.77 
 
 18 
 
 9 
 
 3 
 
 
 
 
 
 Table 5 gives, for the standard magnitude stars, the Bonn Durckmusterfang 
 numbers, the position for 1900, the Potsdam color, and the catalogue magnitudes 
 
 ii 
 
12 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 which form the basis of the photometric work. The "H. C. O." values are taken 
 from the Harvard Annals, 45, the "P. DM." from Potsdam Publications, vols. 9, 
 13 and 14. Then follow the measured magnitudes and residuals which result from 
 Table 10, and will be considered in that connection. As all the measured magnitudes 
 are based on these three catalogue stars it follows that the measured magni- 
 tude of each star expressed in the Potsdam system will be 0.08 greater numerically 
 than its magnitude in the Harvard system. 
 
 TABLE 6. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 1855. 
 
 
 
 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 i 
 
 
 
 
 
 
 
 
 
 
 
 
 
 h m s 
 
 / 
 
 
 O 
 
 
 h m s 
 
 / 
 
 d 
 
 4-26 37 
 
 8.8 
 
 o 13 33 
 
 4-26 10.0 
 
 e 
 
 + 26 46 
 
 9-4 
 
 o 15 47 
 
 + 26 22.9 
 
 a 
 
 4-26 40 
 
 7-5 
 
 o 13 58 
 
 4-26 8.7 
 
 c 
 
 4-26 47 
 
 9- 1 
 
 o 15 50 
 
 4-26 18.4 
 
 I 
 
 4-25 40 
 
 9-5 
 
 o 14 19 
 
 + 25 58.3 
 
 > 
 
 + 26 48 
 
 9-4 
 
 o 16 10 
 
 + 26 12.1 
 
 b 
 
 4- 26 42 
 % 
 
 8.1 
 
 o 14 27 
 
 4-26 23.4 
 
 
 
 
 
 
 Table 6. As a few of the brighter comparison stars are not within the limits 
 of the photographic charts, Table 6 gives the B. D. numbers, magnitudes, and 
 places for 1,855 of the stars in that catalogue not in Table 5. 
 
 TABLE 7. COMPARISON STARS FOR T ANDROMED-B (IN ORDER OF RIGHT ASCENSION). 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 
 // 
 
 s 
 
 // 
 
 
 
 
 
 
 d 
 
 1017 
 
 -74.0 
 
 - 30 
 
 34-7 
 
 9.12 
 
 9.20 
 
 
 
 q 
 
 - 770 
 
 -56.1 
 
 4- 41 
 
 H-3 
 
 
 
 12.2 
 
 is. 3 
 
 a 
 
 - 698 
 
 -50.8 
 
 122 
 
 42.0 
 
 7.98 
 
 8^06 
 
 
 
 P 
 
 - 679 
 
 -49.4 
 
 + 19 
 
 15-3 
 
 
 
 12. I 
 
 12.2 
 
 n 
 
 - 617 
 
 -44-9 
 
 -297 
 
 17.1 
 
 
 
 II. 8 
 
 II.9 
 
 
 
 - 55 
 
 40.0 
 
 -173 
 
 16.3 
 
 
 
 II.9 
 
 12. 
 
 s 
 
 - 411 
 
 -29.9 
 
 -873 
 
 25.6 
 
 10.32 
 
 10.40 
 
 
 
 r 
 
 - 389 
 
 -28.3 
 
 + 8 5 
 
 10.3 
 
 
 
 12.8 
 
 12.9 
 
 b 
 
 - 316 
 
 -23.0 
 
 + 690 
 
 39-0 
 
 's: 7 2 
 
 8.80 
 
 
 
 h 
 
 290 
 
 21 . I 
 
 - 23 
 
 18.9 
 
 
 
 II-5-i 
 
 II .62 
 
 I 
 
 - 259 
 
 -18.9 
 
 690 
 
 26.5 
 
 10.15 
 
 10.23 
 
 
 
 y 
 
 - 85 
 
 - 6.2 
 
 4- 44 
 
 
 14.40 
 
 14.48 
 
 
 
 X 
 
 21 
 
 - i-5 
 
 4-174 
 
 IO.O 
 
 13.12 
 
 13.20 
 
 
 
 w 
 
 4- 30 
 
 4- 2.2 
 
 4-103 
 
 
 13-68 
 
 13-76 
 
 
 
 u 
 
 + 33 
 
 4- 2.4 
 
 4-226 
 
 
 13.22 
 
 13 30 
 
 
 
 z 
 
 4- 108 
 
 + 7.9 
 
 4- 62 
 
 
 14.08 
 
 14. 16 
 
 
 
 m 
 
 + 157 
 
 4-11.4 
 
 4-8oo 
 
 20.5 
 
 
 
 11.28 
 
 11.36 
 
 t 
 
 4- 196 
 
 + 14-3 
 
 4-420 
 
 12.3 
 
 11.66 
 
 11.74 
 
 
 
 k 
 
 4- 227 
 
 4-16.5 
 
 4-io6 
 
 14-3 
 
 11.85 
 
 11-93 
 
 
 
 
 e 
 
 + 793 
 
 + 57-7 
 
 + 659 
 
 30-7 
 
 10. 20 
 
 10.28 
 
 
 
 c 
 
 + 835 
 
 4-60.8 
 
 + 394 
 
 33.6 
 
 9-5i 
 
 9-59 
 
 
 
 } 
 
 4-1125 
 
 4-81.9 
 
 4-n8 
 
 29.5 
 
 
 
 9-97 
 
 10.05 
 
 Table 7 collects the data for position and magnitude of all the comparison 
 stars used. The second and fourth columns give the rectangular coordinates from 
 the variable in seconds of arc; the third column expresses the R. A. coordinate 
 
STELLAR PHOTOMETRY. 
 
 N 
 om 
 
 PLATE 2. 
 
 +20' 
 
 .ei 
 
 j 
 
 tu 
 
 Xa 
 
 W. 
 
 z 
 
 
 
 y 
 
 df 
 
 a,e 
 
 nt 
 
 So 
 
 + 10' 
 
 10' 
 
 Scale, i mm= 13. "7. 
 
 1903 February 1 6. 
 
 103 T ANDROMEDvE. 
 R. A. o h i7n IQS.O. Dec. +26 26' 27", 1900. 
 
CHAPTER II. T ANDROMEDA. 
 
 in seconds of time. The fifth column gives the brightness of the star in steps of 
 the light-scale, which result from the observations in Table n, and will be 
 explained in that connection. The last four columns give the magnitude, either 
 "measured" with the photometer or read from the magnitude-curve (fig. 4). 
 In each case the heading "H." indicates the Harvard, and "P." the Potsdam 
 system. 1 The adopted values for stars measured with both 6- and 12 -inch are 
 taken from the 1 2-inch. 
 
 TABLE 8. 103 T ANDROMEDA. 
 PHOTOMETER MEASURES OF COMPARISON STARS. 
 
 6-INCH. 
 
 1904 October 15. Fair to good, quiet, a little dull. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 I OI 
 
 i 24 
 
 o 
 
 20 
 
 22 
 
 c 
 e 
 b 
 d 
 a 
 I 
 s 
 A 
 B 
 B 
 A 
 I 
 a 
 d 
 b 
 e 
 c 
 
 26.7 27.3 27.1 
 38.8 39.0 38.1 
 
 22.6 24 2 23.0 
 24.2 26.2 26.3 
 15.7 16.3 16.4 
 
 34-8 35-2 36.0 
 36.8 36.7 36.3 
 13.8 14.0 13.9 
 
 13. I 12.2 13.2 
 
 12.9 13.7 12.8 
 15.1 14.0 14.0 
 
 36.1 35-9 36.3 
 16.5 17.2 17.2 
 25.3 26.4 26.9 
 25.8 25.8 25.1 
 36.1 37.2 36.7 
 28.3 27.8 28.5 
 
 27.03 
 38.63 
 23.27 
 
 25-57 
 16.13 
 
 35-33 
 36.60 
 13-90 
 12.83 
 
 I3-I3 
 14.70 
 36. io 
 16.97 
 26.20 
 25-57 
 36.67 
 28.20 
 
 27.62 
 37-65 
 24.42 
 25.89 
 16.55 
 35-72 
 
 14-30 
 12.98 
 
 2.41 
 3-62 
 2.07 
 2.23 
 1.16 
 3-42 
 3-52 
 0.84 
 0.63 
 
 9.22 
 10.43 
 8.88 
 9.04 
 
 7-97 
 10.23 
 
 10-33 
 7-65 
 7-44 
 
 9-30 
 10.51 
 8.96 
 9.12 
 8.05 
 10.31 
 10.41 
 7-73 
 7-52 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 October 27. Fine, moon rising at end. 
 
 31 36 
 
 21 57 
 
 37 
 
 34 
 
 B 
 A 
 s 
 I 
 a 
 d 
 b 
 e 
 c 
 c 
 e 
 b 
 d 
 a 
 1 
 A 
 B 
 
 9-7 io. i 95 
 11.7 11.9 ii .8 
 32.0 31.9 31.8 
 32-8 33-4 33-4 
 13.0 14.7 14.2 
 25. i 25.8 25.0 
 
 21 .0 21 .2 21.4 
 
 30-9 31-3 32-1 
 24.0 25.2 25.0 
 25-5 25.9 25.3 
 32.5 31.6 31.9 
 
 19.4 20. 6 19.8 
 23.2 23.3 24.5 
 14.2 13.6 13.3 
 32.0 33.3 33.0 
 
 II .2 lO.g II. I 
 9.8 II. 2 IO.7 
 
 9-77 
 11.80 
 31.90 
 33-20 
 13 97 
 25-30 
 
 21 . 2O 
 31-43 
 24-73 
 25-57 
 32.00 
 
 19 93 
 23-67 
 13-70 
 32-77 
 ii .07 
 
 10-57 
 
 io. 17 
 11.44 
 
 0.30 
 
 0.44 
 2.92 
 3-05 
 0.76 
 2.08 
 1.66 
 2.89 
 2-15 
 
 7-49 
 7-63 
 
 IO. II 
 
 io. 24 
 7-95 
 9-27 
 8-85 
 10.08 
 9-34 
 
 7-57 
 7-7' 
 io. 19 
 10.32 
 8.03 
 9-35 
 8-93 
 io. 16 
 
 9-42 
 
 32.99 
 13-84 
 24.49 
 20.57 
 3i-72 
 25-15 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 'The letters "H. C. O." and "P. DM" indicate that the magnitudes are taken directly from the 
 respective catalogues. The letters "H." and "P. "indicate measurements by the writer, expressed in the 
 corresponding systems. 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 TABLE 8. 103 T ANDROMED* Continued. 
 
 1904 October 30. Good- 
 
 Sidereal 
 Time. 
 
 h m 
 
 21 OO 
 21 24 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings.; 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 O 
 
 44 
 40 
 
 B 
 A 
 s 
 L 
 a 
 d 
 b 
 e 
 c 
 c 
 e 
 b 
 d 
 a 
 I 
 A 
 B 
 
 11.7 11.4 ii .6 
 ii. o ii. 6 ii. i 
 35.0 36.0 35.3 
 32-9 33-8 33.1 
 14.7 14.6 14.5 
 25.8 25.8 25.1 
 18.8 19.2 19.0 
 34.0 34.0 34.1 
 26.5 26.2 27.1 
 26.8 26.3 26.9 
 33-0 33-3 33-3 
 21.3 20.7 21.3 
 26.0 26. 7 26.0 
 14.9 15.4 14.4 
 
 33-1 33- 33-o 
 ii. 6 ii. 8 ii. i 
 9.8 10.2 10.2 
 
 "57 
 11-23 
 
 35-43 
 33-27 
 14.60 
 
 25-57 
 19.00 
 
 34-03 
 26.60 
 26.67 
 33-20 
 
 21 . IO 
 26.23 
 14.90 
 
 33 03 
 11.50 
 10.07 
 
 10.82 
 ".37 
 
 33-15 
 14-75 
 25-95 
 20.05 
 33-62 
 26.64 
 
 0-37 
 0-43 
 3-39 
 3-07 
 0.90 
 2.24 
 '59 
 3.13 
 2.30 
 
 7-49 
 7-55 
 10. 51 
 
 TO. 19 
 8.02 
 9.36 
 8. 7 I 
 10.25 
 9.42 
 
 7-57 
 7.63 
 10.59 
 10. 27 
 8. 10 
 
 9-44 
 8.79 
 
 10-33 
 9 50 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 September n. 12-INCH. Good. 
 
 20 23 
 20 48 
 
 49 
 45 
 
 d 
 b 
 e 
 c 
 t 
 k 
 
 X 
 
 I 
 I 
 
 X 
 
 k 
 t 
 
 c 
 e 
 b 
 d 
 
 15. i 14.8 16.0 
 ii .9 12.3 12.4 
 23.5 24.8 23.9 
 17.3 18.0 17.5 
 39-7 39-9 4-0 
 39.2 40.7 39-9 
 53-8 54-7 54-3 
 22.9 23. i 23.2 
 23.7 22.9 23.7 
 
 54-2 54-7 54- 2 
 41.1 41.7 40.9 
 40-3 39-9 40-1 
 17.9 19.0 17.7 
 24.3 26.2 25.7 
 ii. 8 ii. i 11.7 
 15.0 14.8 15.1 
 
 15-30 
 
 12. 2O 
 24.03 
 I7.6O 
 39-87 
 
 39-93 
 
 54-27 
 23.06 
 
 23-43 
 54-37 
 41-23 
 40. 10 
 18.20 
 25-40 
 11-53 
 H-97 
 
 15- 14 
 11.87 
 24-72 
 17.90 
 
 39-99 
 40.50 
 
 54-32 
 23-25 
 
 1.07 
 0.88 
 2.17 
 i-43 
 3.78 
 3.85 
 5-17 
 2.05 
 
 9.O6 
 
 8.87 
 
 10. 16 
 9.42 
 11.77 
 ii .84 
 13. 16 
 10.04 
 
 9.14 
 
 8.95 
 10. 24 
 9-50 
 11.85 
 ii .92 
 13-24 
 
 10. 12 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 October 31. Good. 
 
 21 5 
 22 18 
 
 34 
 29 
 
 e 
 c 
 t 
 k 
 
 X 
 
 V 
 
 I 
 
 d 
 b 
 
 
 Oa\ 
 
 d 
 
 I 
 X 
 
 k 
 t 
 c 
 
 e 
 
 2O. 8 21 . I 21 . I 
 
 15.2 16.2 16.7 
 32-8 33.1 34-0 
 37-6 37-3 37-6 
 50.8 50.2 51.4 
 36.7 37-2 37-9 
 
 22. O 21 .9 21.8 
 12.5 13.2 12.9 
 
 5-4 6-6 6 -7 
 14.9 15.7 14.1 
 14-9 '5-7 15-0 
 12.9 12.9 12.9 
 
 2O.9 21 .9 21.8 
 
 47.2 49.2 49.8 
 34.0 34.2 34.9 
 34-2 33-7 34-0 
 14.9 15.2 14.8 
 20.7 20. i 20. 8 
 
 21 .OO 
 16.03 
 
 33-37 
 37-50 
 50.80 
 37-28 
 
 21 .90 
 12.87 
 6.23 
 14.90 
 15.20 
 12.90 
 21-53 
 48.73 
 
 34-37 
 33-97 
 14-97 
 20.53 
 
 20.72 
 15-50 
 33.67 
 35-94 
 49-77 
 
 21.72 
 12.89 
 
 1-79 
 
 I . 12 
 
 3-04 
 
 3 29 
 4-78 
 3-46 
 1.90 
 0.76 
 
 O. 12 
 
 1.07 
 
 10.22 
 9-55 
 
 "47 
 
 11.72 
 13.21 
 11.89 
 10.33 
 9.19 
 
 8.55 
 9-50 
 
 IO.3O 
 9.63 
 
 "55 
 11.80 
 
 13-29 
 11.97 
 10.41 
 
 9-27 
 8.63 
 
 9 59 
 
 15.05 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER II. T ANDROMEDA. 
 TABLE 8. 103 T ANDROMED/B Continued. 
 
 1904 November 2. Fair, a little dull, and unsteady. 
 
 Sidereal 
 Time. 
 
 Zen. 
 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 21 30 
 
 21 50 
 
 
 
 38 
 
 34 
 
 { 
 
 d 
 b 
 e 
 c 
 
 t 
 
 X 
 
 k 
 
 V 
 
 k 
 t 
 c 
 e 
 b 
 d 
 I 
 
 28.9 29. i 29.4 
 20.3 20.3 20.3 
 16.7 16. 7 16.0 
 32.2 32.0 30.8 
 25.0 25.3 24.8 
 44.2 44.7 44.8 
 60 
 
 29.13 
 20.30 
 16.47 
 31.67 
 25-03 
 44-57 
 
 30.10 
 20.27 
 16.55 
 31-54 
 24.38 
 
 45-15 
 
 60. 
 47.60 
 
 2.67 
 1.74 
 1.27 
 2.82 
 2-15 
 4-35 
 5-6 
 4-59 
 4-44 
 
 10.07 
 9.14 
 8.67 
 
 IO. 22 
 
 9-55 
 "75 
 I3-0 
 11.99 
 u .84 
 
 10.15 
 9.22 
 
 8.75 
 10.30 
 
 9 63 
 11.83 
 
 13- 1 
 12.07 
 ii .92 
 
 47.2 47.9 47.0 
 46.0 45.9 46.5 
 48-2 47-7 47-6 
 45-5 45-9 45-8 
 23.2 24.0 24.0 
 
 3i-3 3i-5 31-4 
 15.9 17.2 16.8 
 20.4 20. i 20. 2 
 31.9 31.0 30.3 
 
 47-37 
 46-13 
 47-83 
 45-73 
 23-73 
 3I-40 
 16.63 
 20.23 
 31-07 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 January 14. 40-INCH. Fair, unsteady. 
 
 4 27 
 
 52 
 
 t 
 k 
 
 2 
 W 
 Va, 
 X 
 
 u 
 u 
 
 X 
 
 W 
 
 z 
 
 k 
 t 
 
 34-i 34-7 33-7 
 33-4 33-7 33-i 
 56.7 58.7 58.0 
 
 53-0 51 7 5i-5 
 9.5 8.4 ji. i 
 44-3 44-5 44-9 
 47-8 46-4 45-9 
 46 . 7 46.2 46 . 7 
 41 .0 42.9 42. i 
 51.3 51.8 51.9 
 57-8 57.1 57.3 
 32-5 32-7 32-4 
 3i 7 3i-9 33 o 
 
 34-17 
 33-40 
 57-8o 
 52.07 
 9.67 
 44-57 
 46-77 
 46.53 
 42.00 
 
 51-67 
 57 40 
 
 32.53 
 32.20 
 
 33- 8 
 32-98 
 57-6o 
 
 5I-87 
 
 43-28 
 46.65 
 
 3.00 
 2.96 
 5-37 
 4-99 
 0.41 
 4-13 
 4 50 
 
 11.85 
 II. 8l 
 
 14. 22 
 
 13-84 
 9. 26 
 12.98 
 
 3-35 
 
 H-93 
 11.89 
 I4-30 
 13-92 
 9 34 
 13-06 
 
 '3-43 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 January 28. Good. 
 
 4 22 
 4 38 
 
 57 
 
 t 
 k 
 
 z 
 ' 
 
 y 
 
 X 
 
 u 
 u 
 
 X 
 
 y 
 
 W 
 
 z 
 
 k 
 t 
 
 20. 21 .2 2O.7 
 22. O 21 .9 22.3 
 41.2 41.3 40.7 
 36.1 37.0 36.4 
 42.7 43.6 43.3 
 31.9 32.1 31.7 
 
 34-0 33-9 34-i 
 33-i 33-8 32-8 
 30.0 31.0 31.3 
 42.5 43-3 43- 1 
 36-3 35-o 35-5 
 39.8 40.0 41 .0 
 19.8 20.3 19.9 
 19.8 20.9 20. o 
 
 20.63 
 22.07 
 41.07 
 36-50 
 43-20 
 31.90 
 34-00 
 33-23 
 30-77 
 42-97 
 35-6o 
 40.27 
 20.00 
 20.23 
 
 20.33 
 21.04 
 40.67 
 36-05 
 43.08 
 
 31.34 
 33-62 
 
 1.74 
 1-83 
 3-85 
 3-3i 
 4.11 
 2.79 
 3-05 
 
 11.83 
 ii .92 
 
 13-94 
 I3-40 
 14.20 
 12.88 
 I3-I4 
 
 ii .91 
 
 12. OO 
 
 14.02 
 
 I3-48 
 14.28 
 12.96 
 13-22 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
i6 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 8. 103 T ANDROMEDA Continued. 
 
 1905 February 25. Fair to good, low. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 O 
 
 t 
 
 22. 2 22. I 22.3 
 
 22. 2O 
 
 21.68 
 
 1.89 
 
 ii .89 
 
 11.97 
 
 
 
 k 
 
 21.3 22.4 22.7 
 
 22. 13 
 
 20.46 
 
 i-75 
 
 "-75 
 
 11.83 
 
 
 
 z 
 
 41.5 42.3 42.9 
 
 42-23 
 
 42.82 
 
 4.08 
 
 14.08 
 
 14. 16 
 
 
 
 w 
 
 4-3 39-3 40- 2 
 
 39-93 
 
 40.05 
 
 3-79 
 
 '3-79 
 
 13-87 
 
 
 
 Va, 
 
 ii . 5 10.4 11.4 
 
 II . IO 
 
 10.82 
 
 0-53 
 
 10-53 
 
 10. 61 
 
 
 
 y 
 
 48.2 48.1 48.9 
 
 48.40 
 
 47-76 
 
 4.60 
 
 14.60 
 
 14.68 
 
 
 
 X 
 
 32.5 33-8 32-9 
 
 33-07 
 
 33-25 
 
 3-00 
 
 13.00 
 
 1 3 . 08 
 
 
 
 u 
 
 35-2 35-i 34-7 
 
 35-00 
 
 34-68 
 
 3.16 
 
 13. 16 
 
 13-24 
 
 
 
 X 
 
 32.8 34.2 33.3 
 
 33-43 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 IO ^T. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 k 
 
 
 19 8O 
 
 
 
 
 
 
 35 
 
 t 
 
 20. O 21.7 21.8 
 
 21.17 
 
 
 
 
 
 
 
 
 
 Table 8 gives the detailed photometric measures and reductions of the com- 
 parison stars in Table 7, based on the stars in Table 5. The series measured on 
 three nights with the 6-inch includes the three catalogue stars A, B, and a, also 
 the six comparison stars, b, c, d, e, I, and s. A complete series consists of three 
 settings on each star in the list, followed immediately by three more settings on 
 the stars in reverse order. Thus the mean of the times is the same for each star 
 and any progressive changes in the real or the artificial star will be eliminated. 
 In the seventh column there are two mean scale readings for each star, which 
 are united into the single mean of the eighth column. The ninth column contains 
 the values of C (curve reading) corresponding to each mean scale reading. These 
 are taken from the absorption curves, E 6 for the 6-inch and A 12 for the 12- 
 and 4O-inch, and express the relative magnitudes of the stars as explained 
 below. To convert C into magnitudes in the system of the catalogue, it is 
 increased by the quantity M taken from Table 9. For example, on October 15 
 the mean C for the three standard stars is 0.88; the mean of their magnitudes 
 from the H. C. O. Catalogue is 7.69; the difference in the two quantities, called 
 M OI is 6.8 1. If M J be added to each C, the mean of the sums for the three stand- 
 ard stars will agree with the mean of their catalogue magnitudes, and the separate 
 sums will preserve the relative magnitudes as measured. The quantity M is 
 the magnitude of the zero reading on the absorption curve, and when increased 
 by the C of each star will give the magnitude in the system used. In the example 
 we are using the M in the Potsdam system is 6.89. Adding these values of M 
 to C we have the last two columns of Table 8, the measured magnitudes in the 
 H. C. O. and P. DM. systems. 
 
 The sidereal time and zenith distance, given in the first two columns of Table 8, 
 serve to show that no correction is needed for change in atmospheric absorption 
 due to difference in zenith distance between the standard stars and the stars to 
 be measured. For example, on October 15, when the field was near the meridian, 
 
CHAPTER II. T ANDROMEDA. 
 
 the mean zenith distance of the three standard stars was less than that of 
 the measured stars. At zenith distance 21 a difference of corresponds to a 
 change of o.ooi magnitude in the atmospheric absorption, which is negligible. 
 The stars measured with the 12- and 4o-inch were all within 20' of the variable, so 
 that the correction would be even less. The subscript 01, appended to the star 
 letter, shows that the star was measured through one shade glass, which increases 
 the magnitude numerically by 0.75 for the 6-inch and 0.84 for the 12- and 4o-inch 
 measures. 
 
 TABLE 9. 103 T ANDROMEDA. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 October 15. 
 
 October 27. 
 
 October 30. 
 
 C. 
 
 Obs. Mag. 
 
 4 Mag. 
 
 C. 
 
 Obs. Mag. 
 
 4 Mag. 
 
 C. 
 
 Obs 
 
 Mag. 
 
 4 Mag. 
 
 H. 
 
 P. 
 
 H. P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. P. 
 
 A 
 B 
 a 
 
 Means. 
 
 Hi.... 
 
 0.84 
 0.6' 
 i. if 
 
 7.65 
 7-44 
 7-97 
 
 7-73 
 7.52 
 8.05 
 
 .02 .03 
 
 + .23 + .10 
 
 - .23 - .07 
 
 0.44 
 0.30 
 0.76 
 
 7-6 
 7-4' 
 7.9 
 
 3 7-7' 
 J 7-57 
 5 8.03 
 
 - .04 
 
 + . 2 
 
 - -25 
 
 - -05 
 + 15 
 .09 
 
 0-43 
 o.37 
 0.90 
 
 7-5, 
 7-4< 
 8.0: 
 
 i 7.63 
 ) 7-57 
 8.10 
 
 -.12 -.13 
 + .28 + .15 
 
 - .18 - .02 
 
 o.8f 
 
 7.69 
 6.81 
 
 7-77 
 6.89 
 
 .16 .07 
 
 0.50 
 
 7 .6< 
 
 ) 7-77 
 ) 7-27 
 
 19 
 
 . 10 
 
 0-57 
 
 7 .6c 
 
 7.1; 
 
 7-77 
 7. 20 
 
 .19 .10 
 
 12-INCH. 
 
 40-INCH. 
 
 Star. 
 
 Mag. 
 6-inch. 
 
 C. 
 
 Star. 
 
 Mag. 
 12-inch 
 
 C. 
 
 Sept. ii. Oct. 31. 
 
 Nov. 2. 
 
 Jan. 14. 
 
 Jan. 28. Feb. 25. 
 
 6 
 
 8.81 
 
 9-33 
 9.22 
 
 0.88 o 19 
 
 1.43 I. 12 
 
 1.07 0.76 
 
 1.27 
 2-15 
 
 i-74 
 
 k 
 
 11.85 
 11.66 
 13. 12 
 
 2.96 
 3.00 
 
 1.83 i-75 
 i . 74 1-89 
 2.79 300 
 
 c 
 
 t 
 
 d 
 
 X - - 
 
 Mean 
 Mean 
 
 Mo . . 
 
 r 
 
 Mean 
 Mean 
 M . . . 
 
 C. . . 
 
 
 1.13 0.69 
 
 9. 12 9. 12 
 
 7-99 8.43 
 
 1.72 
 9.12 
 7.40 
 
 
 3.36 
 
 12. 21 
 
 8.85 
 
 2. 12 2.21 
 12.21 12.21 
 
 10.09 10. oo 
 
 Mag. 
 
 9. 12 
 
 Mag. 
 
 12.21 
 
 
 
 
 
 Table 9 contains the values of C, the reading from the absorption-curve of 
 the wedge. From the mean C we derive the M used in the reductions. In the 
 first part of the table (6-inch) the observed magnitudes of the three standard stars 
 are given, both in the Harvard and Potsdam systems, in the columns headed H. 
 and P. Subtracting the catalogue magnitudes in Table 5 from these observed 
 values gives the residuals tabulated under " d Mag." for each system. The con- 
 clusions which may be drawn from these residuals are discussed in Chapter XIV. As 
 the measures with the 12 -inch are based on the standards fixed with the 6-inch, 
 the second division of the table contains the 6-inch magnitudes of the three 
 standard stars b, c, and d, from Table 10, and the values of C found on the three 
 nights with the resulting values of M . Similarly the 4o-inch division of the 
 table gives the magnitudes derived with the 1 2-inch for k, t, and x, with C and 
 M . In the last two divisions the magnitudes are given in the Harvard system 
 only, to express them in the Potsdam system add 0.08 as shown in Table 5. 
 
i8 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 10. 103 T ANDROMEDA. MEAN MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 October 15. 
 
 October 27. 
 
 October 30. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. H- 
 
 Mag. P. 
 
 A Mag. 
 
 A 
 
 7.65 
 7-44 
 7-97 
 
 + 0.04 
 -0.03 
 
 -O.OI 
 
 7-63 
 7-49 
 7-95 
 
 + O.O2 
 + 0.02 
 0.03 
 
 7-55 
 7-49 
 
 8.02 
 
 0.06 
 
 + O.O2 
 4-O.O4 
 
 7.61 
 
 7-47 
 7.98 
 
 7.69 
 
 7-55 
 8.06 
 
 0.04 
 0.02 
 0.03 
 
 B 
 
 
 Mean 
 
 7.69 
 
 7-77 
 
 0.03 
 
 6 
 
 8.88 
 9.22 
 9.04 
 10.43 
 10.23 
 10-33 
 
 + 0.07 
 
 O. II 
 
 -0.18 
 + 0.18 
 
 + O.OI 
 4-O.OI 
 
 8.85 
 
 9-34 
 9.27 
 10.08 
 10.24 
 
 IO. II 
 
 + 0.04 
 
 4-O.OI 
 
 + 0.05 
 -0.17 
 
 + O.O2 
 O.2I 
 
 8.71 
 9.42 
 9-36 
 10.25 
 10. 19 
 10.51 
 
 O. IO 
 O.O9 
 
 + o. 14 
 o.oo 
 0.03 
 + o. 19 
 
 8.81 
 9 33 
 
 9. 22 
 10.25 
 IO.22 
 10.32 
 
 9.69 
 
 8.89 
 9.41 
 9-30 
 10.33 
 10.30 
 10.40 
 
 0.07 
 0.07 
 
 O. 12 
 0.12 
 O.O2 
 0.14 
 
 
 d 
 
 
 1 
 
 
 
 9-77 
 
 0.09 
 
 
 
 
 
 
 
 
 12-INCH. 
 
 Star. 
 
 September n. 
 
 October 31. 
 
 November 2. 
 
 Mean. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 JMag. 
 
 Mag. H. 
 
 Mag. P. 
 
 J Mag. 
 
 b 
 
 8.87 
 9.42 
 9.06 
 
 + 0.15 
 0.09 
 0.06 
 
 8.62 
 
 9-55 
 9.19 
 
 o. 10 
 + 0.04 
 + 0.07 
 
 8.67 
 
 9-55 
 9.14 
 
 0.05 
 + 0.04 
 
 4-O.O2 
 
 8.72 
 9-5i 
 
 9. 12 
 
 8.80 
 
 9 59 
 9.20 
 
 O. IO 
 
 0.06 
 0.05 
 
 
 d 
 
 
 9.12 
 
 9.20 
 
 0.07 
 
 e 
 
 10. 16 
 11.84 
 10.04 
 11.77 
 13.16 
 
 0.64 
 
 O.OI 
 0. II 
 + O. II 
 
 + 0.04 
 
 IO.22 
 11.72 
 10.33 
 11.47 
 13.21 
 
 + O.O2 
 
 -0.13 
 
 + 0.18 
 o. 19 
 + 0.09 
 
 IO.22 
 
 11.99 
 
 10.07 
 "75 
 3- 
 
 4-O.O2 
 
 4-0. 14 
 -0.08 
 + 0.09 
 
 O. 12 
 
 IO.2O 
 11.85 
 10.15 
 
 11.66 
 13.12 
 
 10.28 
 
 "93 
 10.23 
 11.74 
 13.20 
 
 0.03 
 0.09 
 
 O. 12 
 
 0.13 
 0.08 
 
 k 
 
 / 
 
 t 
 
 
 Mean . ... 
 
 11.40 
 
 11.48 
 
 0.09 
 
 
 
 
 
 
 
 40-INCH. 
 
 Star. 
 
 January 14. 
 
 January 28. 
 
 February 25. 
 
 Mean. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 d Mag. 
 
 Mag. 
 
 JMag. 
 
 Mag. H. 
 
 Mag. P. 
 
 4 Mag. 
 
 k 
 
 n. 81 
 11.85 
 12.98 
 
 O.O2 
 O.OI 
 
 + 0.03 
 
 ii .92 
 
 11.83 
 12.88 
 
 + 0.09 
 -0.03 
 0.07 
 
 "75 
 ii .89 
 13.00 
 
 0.08 
 4-0.03 
 4-0.05 
 
 11.83 
 11.86 
 12.95 
 
 11.91 
 11.94 
 13-03 
 
 0.06 
 
 0.02 
 
 0.05 
 
 t 
 
 
 Mean 
 
 12.21 
 
 12.29 
 
 0.04 
 
 u ... .... 
 
 J3-35 
 13-84 
 
 + 0.13 
 
 + 0.16 
 
 I3-I4 
 '3 40 
 14. 20 
 
 13 94 
 
 -0.08 
 -0.28 
 
 O.2O 
 + 0.14 
 
 13.16 
 
 13-79 
 14.60 
 14.08 
 
 0.06 
 4-0. ii 
 
 4-O.2O 
 
 o.oo 
 
 13.22 
 13.68 
 14.40 
 I4.O8 
 
 I3-30 
 I3-7 6 
 14.48 
 14. 16 
 
 0.09 
 0.18 
 o. 20 
 0.09 
 
 TV 
 
 y 
 
 2 
 
 14.22 
 
 + 0.14 
 
 Mean 
 
 13 85 
 
 '3 93 
 
 0.14 
 
 
 
 
 
 
 
 
CHAPTER II. T ANDROMEDA. 19 
 
 Table 10 collects the magnitude results for each night from Table 8 and forms 
 the means. The magnitudes for the separate nights are expressed in the Harvard 
 system, and followed by the column "J Mag." giving the residuals from the 
 mean of three nights. The columns of means give the magnitude in both systems, 
 and lastly the means of the separate residuals. 
 
 Table n gives the comparisons of the variable by Argelander's method 
 (including a few photometric and photographic) , the resulting photometric magni- 
 tudes of the variable, and a comparison with the mean light-curve. The Central 
 Time (6 hours west of Greenwich) is given in the third column to the nearest hour, 
 but as the records were usually made to the nearest quarter hour, the decimal 
 of the Julian day in the fourth column is carried farther and sometimes differs 
 by one or two hundredths from the hour in column three. In the fifth column, 
 "Aperture," 6 stands for the 6^-inch Brashear reflector (clear aperture equivalent 
 to 6.2 inches 15 cm.), 3 for the same with diaphragm, 12 and 40 for the Yerkes 
 refractors (30 and 102 cm. respectively), 24 for the 60 cm. reflector. 
 
 The comparisons in the seventh column, unless otherwise stated, were made 
 by Argelander's method, the comparison stars being denoted by letters, -v stand- 
 ing for the variable. The stars compared were brought equally distant from the 
 center of the field and the head turned till the line joining the eyes was parallel 
 to that joining the stars. Then by glancing from one star to the other the interval 
 in steps was estimated. In the records the brighter star is given first; cm is read 
 "c is one step brighter than the variable;" b^-^v, b is four or five steps brighter 
 than the variable. When the variable was not seen the limiting magnitude is 
 usually estimated from the faintest comparison star visible, for example "limit 
 4<>" means that the limit of visibility is four steps fainter than e. 
 
 The reductions in columns 8, 9, and 10 were made as follows: (i) The light 
 scale was formed in the usual manner from all the step intervals in column 7, 
 with the results given in the fifth column of Table 7. (2) Each comparison in 
 the seventh column then gives the brightness of the variable in steps, columns. 
 For example, on the first date, since 6= 39.0 steps, the comparison 64-57; gives 34.5 
 for the brightness of the variable. (3) To form the mean step values for the 
 ninth column, if the estimated interval is greater than two or three steps the results 
 are weighted inversely as the interval. (4) To obtain the corresponding photometric 
 magnitudes given in the tenth column in the Harvard system, recourse is had 
 to the "Magnitude-Curve" (fig. 4). Using the data in Table 7, for the stars 
 measured with the photometer, the step values are platted as ordinates and 
 the magnitudes as abscissas. (5) A smooth curve is drawn through the platted 
 points, giving from the step values in the ninth column the magnitudes in the 
 tenth. The step values of the stars not measured are entered in crosses on the 
 magnitude-curve, and the resulting magnitudes are given in Table 7, eighth and 
 ninth columns. 
 
2O 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLB n. 103 T ANDROMEDA. VISUAL OBSERVATIONS OP THE VARIABLE. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 I 
 
 I 
 
 <! 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing 
 
 I 
 
 J Mag 
 
 Month 
 and Day. 
 
 Hour 
 
 :. s. T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 34-4 
 32.1 
 
 36.5 
 
 Mag. 
 
 i 
 
 3 
 
 3 
 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 
 10 
 
 it 
 
 12 
 13 
 
 14 
 
 15 
 16 
 
 17 
 18 
 
 19 
 20 
 
 21 
 22 
 
 23 
 
 24 
 25 
 26 
 
 27 
 
 28 
 29 
 
 30 
 
 3 l 
 3 2 
 33 
 34 
 
 3 I 
 3<5 
 
 37 
 38 
 39 
 40 
 
 4 1 
 42 
 
 1894 
 Mar. 15 
 17 
 
 21 
 
 23 
 26 
 
 Apr. i 
 
 3 
 ii 
 
 15 
 
 24 
 27 
 May 2 
 7 
 24 
 June 30 
 July 29 
 Nov. 15 
 
 20 
 
 23 
 26 
 
 Dec. 2 
 
 5 
 
 13 
 
 17 
 20 
 
 25 
 29 
 
 1895 
 Jan. i 
 
 3 
 
 7 
 15 
 
 22 
 26 
 31 
 
 Feb. 15 
 
 21 
 
 Mar. i 
 ii 
 16 
 
 7 
 May 26 
 
 July 24 
 
 7 
 7 
 
 7 
 
 7 
 17 
 16 
 16 
 16 
 
 16 
 
 16 
 16 
 16 
 15 
 15 
 ii 
 
 10 
 
 6 
 
 7 
 
 7 
 7 
 6 
 
 8 
 
 6 
 6 
 
 7 
 7 
 
 7 
 
 7 
 7 
 
 7 
 
 7 
 6 
 
 7 
 7 
 7 
 7 
 7 
 7 
 7 
 7 
 14 
 
 2410000+ 
 2903.54 
 2905-54 
 
 2909.54 
 
 2911-54 
 2914.96 
 2920.94 
 2922.92 
 2930.92 
 
 2934-92 [ 
 
 2943.92 
 2946.92 
 2951.92 
 2956.88 
 2973.88 
 3010.71 
 
 3039-67 
 3148.50 
 
 3I53.54 
 3I56.54 { 
 3159.54 
 3165.50 -j 
 
 3168. 58 -j 
 
 3576.50 
 3180.50 
 3183.54 
 3188.54 
 
 3192-54 
 
 3195.54 
 3I97.54 
 
 3201.54 
 
 3209.54 
 3216.50 
 3220.54 
 3225.54 
 3240-54 
 3246.54 
 3254.54 
 3264.54 
 3269-54 
 3270.54 
 3310.83 
 
 3399.63 
 
 40 
 
 40 
 150 
 
 40 
 
 40 
 150 
 40 
 40 
 40 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 
 40 
 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 150 
 40 
 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 3 
 6 
 
 3 
 (6 
 
 b 
 6 
 
 3 
 3 
 
 I 6 
 (3 
 
 J6 
 (3 
 
 11 
 
 <6 
 
 ia 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 64-501, civ, vi-2d 
 
 34.5, 32.6,36.2 
 
 9.27 
 9.60 
 
 8.97 
 
 moon 
 fair 
 
 low 
 
 o 
 
 2 
 
 6 
 
 8 
 ii 
 
 i? 
 '9 
 
 27 
 
 3i 
 40 
 43 
 48 
 53 
 70 
 107 
 
 245 
 250 
 
 253 
 256 
 262 
 
 265 
 
 273 
 
 277 
 280 
 
 3 
 
 7 
 
 10 
 
 12 
 
 16 
 
 24 
 31 
 
 35 
 40 
 
 55 
 61 
 69 
 
 79 
 84 
 
 85 
 125 
 
 214 
 
 + 0.45 
 + 0.74 
 
 + 0.04 
 + 0.17 
 
 O.OI 
 
 -0.13 
 
 -0.37 
 -0.52 
 0.40 
 0.60 
 -0.30 
 
 + 0.38 
 + 0.18 
 
 + 0.03 
 
 + O.O2 
 O.O4 
 
 + 0.03 
 
 -0.17 
 
 O.O7 
 -0.13 
 O. 10 
 
 -0.38 
 -0.23 
 
 O. 12 
 
 -0.25 
 
 -0.36 
 
 -0.34 
 0.36 
 -0.38 
 
 -0.54 
 O.2I 
 -0.14 
 
 -0.37 
 
 fv glimpsed, 62-3 n?... \ 
 
 
 v not seen, trees, etc 
 
 
 twilight too bright 
 
 
 
 
 
 c and d seen, D uncertain 
 di 2D, quite certain .. . 
 
 
 34 
 33-2 
 32.2 
 
 31.8 
 31.2 
 
 31-4 
 29.2 
 29.2 
 
 22.8 
 
 04 
 
 <27 
 
 35-1 
 37-8 
 
 39-2 
 39-4 
 39-7 
 
 39-0 
 
 39-4 
 
 38.4 
 38.5 
 37-8 
 
 38.9 
 
 37-6 
 36.4 
 36.5 
 
 35-4 
 33-3 
 32.5 
 31-3 
 28.4 
 24.6 
 
 22.2 
 <26 
 
 <25 
 <26 
 
 <i6 
 
 27-7 
 
 9-3 
 9-47 
 9-59 
 
 9.64 
 
 9-74 
 9.70 
 
 IO.O2 
 IO.O2 
 10.99 
 12.3 
 10.3 
 9.18 
 8.78 
 
 8.58 
 
 8-54 
 8.50 
 
 8.60 
 
 8.52 
 8.67 
 
 8.66 
 8.78 
 
 8.62 
 
 8.80 
 8.98 
 
 8.97 
 
 9.12 
 9-43 
 9-55 
 9.72 
 10.15 
 10.71 
 11.07 
 
 < IO.O 
 
 <io.6 
 <io.s 
 
 < 12. 
 
 10. 24 
 
 good 
 fair 
 
 low 
 
 fair 
 fair 
 low 
 fair 
 fair 
 fair 
 fair 
 fair 
 good 
 
 fine 
 good 
 good 
 
 good 
 
 good 
 
 fine 
 fair 
 good 
 
 good 
 
 good 
 good 
 
 good 
 good 
 poor 
 good 
 good 
 good 
 poor 
 good 
 fair 
 fair 
 
 fair 
 
 
 0*231;, uncertain 
 
 
 d2D, c2-yv 
 d3~ 41; 
 
 32.7,31-6 ( 
 31.2 f 
 
 dyv, C4D, vi-ie 
 dyv, Tio-ie 
 en), (ei 21)) 
 
 31.7, 29.6, 32.2 
 31-7, 31-2 
 
 ds-6i', 4-51), ei-2i' 
 e6i>, D3& 
 1} not held, h and k seen . 
 
 29.2, 29.1, 29.2 
 24-7, 21.9 
 
 v not held limit 4 < e 
 
 
 &3D, do-lV, TJI-2C 
 
 1)4^, lib, "V2d, 041) 
 
 36.0, 34.2, 35.1 
 37.6,39.0,36.7,38.0.. 
 
 a2V, v$d, vib, h2k ) 
 limit 2 3< k? i 
 
 39-5, 38.7, 40.0 
 39-0, 39-7, 41-0. . .]_ 
 40.0, 39.5, 38.7. . . > 
 39-5, 38.2, 40.0. . . I 
 40.0, 36.7, 40.0. . .) 
 39.0, 38.7, 40.5. . .) 
 39.0, 38.7, 40.5. . .) 
 38.5, 38.2 
 39-o, 37-7, 38.5 
 37-5, 38-2 
 
 38.0, 37.7, 38.0 
 
 38.0, 38.7,36.5. . .\ 
 38.5, 37-5, 36.5 .) 
 36-5, 37-2, 35-6 . .) 
 36.0,36.7 j 
 37.0,36.7 1 
 36.5,36.7 J 
 36.0, 35.2, 35.1 
 
 31-7, 33-6, 34-7 
 32-2, 31.6, 33.7 
 
 30.7, 30.1, 33-7, 3-5 
 28.2,28.5 
 27-7, 23.5, 23.5, 23.9 
 21.5, 22.9 
 
 0231), Ti^d, vib 
 031), v$d, 1)26 
 vib, 0231), D4d 
 02-31;, D3-4d, vib 
 021;, D2d, DI& 
 031), i>4d, i;i 26 
 03^, 1140", 1/126 
 
 13-4". ^3-4^, (*3-4^?) 
 031;, vyi, 60-11; 
 61-21;, 1/3-40" 
 
 [ 611;, 1)30", 0411 
 0411, D4d, 62-31; 
 
 0341), 6 1 2D, V2(t 
 
 05-61), 1)2-30", 62-311 
 byj, V2d 
 621), V2d 
 62-31), T>2d 
 byv, vo-id, vi-2c 
 dyv, lie, v^e 
 d2-yv, C2V, 1)36 
 dAD c 14.T v\e. v&l 
 
 ei-yv, V2l 
 
 ew Ivu vim wzh 
 
 I^TI, i>4/t 
 D not seen limit / 
 
 D not seen, limit i </. . . . 
 
 
 i; not seen limit / 
 
 
 v not seen, limit 2 3</i. 
 
 
 v8h 
 
 26.9.. ..) 
 
 eyv. V2l 
 
 27 7, 28.5 ) 
 
CHAPTER II. T ANDROMEDA. 
 
 21 
 
 TABLE n. 103 T ANDROMEDA. VISUAL OBSERVATIONS OF THE VARIABLE Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 1 
 
 
 
 I 
 
 < 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing 
 
 /. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C.ST. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 43 
 44 
 
 45 
 46 
 
 47 
 48 
 
 49 
 50 
 5i 
 
 52 
 
 53 
 
 54 
 55 
 56 
 57 
 58 
 59 
 60 
 
 61 
 62 
 
 63 
 64 
 
 65 
 66 
 
 67 
 68 
 69 
 70 
 7' 
 72 
 73 
 74 
 75 
 76 
 77 
 78 
 
 79 
 80 
 
 81 
 
 82 
 83 
 84 
 
 85 
 86 
 
 87 
 88 
 89 
 90 
 
 1895 
 Aug. 5 
 
 8 
 
 12 
 
 25 
 26 
 30 
 
 Sept. 2 
 
 9 
 16 
 
 17 
 26 
 Oct. 5 
 9 
 IS 
 19 
 23 
 Nov. i 
 
 10 
 
 Dec. 2 
 9 
 25 
 
 1896 
 Jan. 6 
 
 13 
 20 
 Feb. 5 
 
 8 
 
 21 
 
 Mar. i 
 3 
 
 12 
 
 Aug. 3 
 
 27 
 Sept. 7 
 
 25 
 Oct. 6 
 
 24 
 Nov. 26 
 Dec. 23 
 
 1897 
 Jan. 6 
 19 
 
 28 
 
 Feb. 13 
 
 May 24 
 July 21 
 
 27 
 Aug. 19 
 
 27 
 
 9 
 
 8 
 
 9 
 
 8 
 8 
 8 
 
 9 
 
 8 
 8 
 
 7 
 
 7 
 
 7 
 8 
 8 
 7 
 7 
 7 
 
 7 
 
 7 
 6 
 
 7 
 7 
 
 7 
 7 
 7 
 7 
 7 
 7 
 7 
 7 
 7 
 10 
 
 9 
 
 8 
 
 7 
 7 
 6 
 8 
 6 
 
 6 
 
 7 
 
 7 
 
 7 
 '5 
 
 10 
 
 10 
 9 
 9 
 
 2410000 + 
 34" -63 
 3414.61 
 
 3418.63 
 
 3431-58 
 3432.58 
 3436-58 
 
 3439.63 
 3446.58 
 3453-58 
 
 3454-54 
 
 3463-54 
 
 3472 - 54 
 3476.58 
 3482.58 
 3486.54 
 3490.54 
 3499-54 
 3508 . 54 
 
 35I3-54 
 3530.50 
 3537-54 
 3553-54 
 
 3565 54 
 3572.54 
 3579-54 
 3595-54 
 3598.54 
 3611-54 
 3620.54 
 3622.56 
 3631-54 
 3775-67 
 3799.63 
 3810.58 
 3828.54 
 
 3839-54 
 3857-52 
 3890.58 
 39I7-50 
 
 3931-50 
 3944-54 
 
 3953-54 } 
 
 3969.54 ^ 
 
 4069 . 88 
 4127.67 
 4133 67 
 4156.63 
 4164.63 
 
 40 
 40 
 
 40 
 40 
 40 
 
 40 
 40 
 40 
 
 40 
 
 40 
 
 40 
 40 
 40 
 40 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 150 
 
 150 
 150 
 150 
 150 
 15 
 150 
 150 
 40 
 
 40 
 150 
 150 
 15 
 150 
 80 
 150 
 150 
 
 150 
 150 
 40 
 150 
 150 
 40 
 150 
 150 
 150 
 150 
 150 
 
 6 
 6 
 
 6 
 (6 
 
 b 
 
 3 
 
 I 6 
 (3 
 
 3 
 3 
 6 
 
 <3 
 (6 
 
 I 6 
 13 
 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 d2v, cyv 
 H4-5/, civ, Ti$e, D2/, di-2D < 
 
 32.7, 30.6 
 31.0, 32.6, 35 7--1 
 
 3i.fi 
 
 32.8 
 
 35-o 
 38.8 
 
 37-4 
 39-0 
 
 39-4 
 38.2 
 
 39-i 
 
 38.7 
 
 38.4 
 40.4 
 37-8 
 35-6 
 34-4 
 35-i 
 32.9 
 
 3i-9 
 
 30-4 
 24.8 
 22.3 
 19.8 
 
 15.8 
 iS-i 
 H-3 
 n. 8 
 ii. 8 
 <i6 
 
 <I2 
 
 <i6 
 <I9 
 3i-4 
 23.4 
 22.4 
 15-6 
 16.6 
 '3-3 
 
 9-2 
 
 11.9 
 
 15-0 
 18.6 
 
 20. i 
 
 25.4 
 23.2 
 12.3 
 10.4 
 10.3 
 10.4 
 
 9.68 
 9-51 
 9.20 
 
 8.63 
 8.82 
 8.60 
 
 8-55 
 8.72 
 
 8.59 
 8.63 
 
 8.70 
 
 8.38 
 8.78 
 9. 10 
 
 9-27 
 9. 18 
 9-50 
 
 9.63 
 
 9 85 
 10.68 
 11.05 
 ii .42 
 
 12. OO 
 12. II 
 12. 22 
 I 2. 6O 
 I 2. 60 
 < 12. 
 <I2.6 
 < 12. O 
 
 <" 5 
 9.70 
 10.88 
 11.03 
 12.04 
 11.88 
 
 12.37 
 12.97 
 
 12.59 
 
 12.12 
 11.59 
 
 "37 
 10.56 
 
 10.91 
 12.51 
 12.80 
 
 12. 8l 
 
 12.80 
 
 moon 
 fair 
 
 good 
 
 good 
 good 
 good 
 
 fair 
 poor 
 fair 
 
 good 
 
 fair 
 
 fair 
 good 
 good 
 good 
 good 
 fair 
 
 good 
 
 good 
 moon 
 good 
 fair 
 
 fair 
 good 
 moon 
 fair 
 good 
 moon 
 good 
 good 
 poor 
 good 
 good 
 good 
 good 
 good 
 good 
 fine 
 good 
 
 good 
 good 
 
 good 
 
 good 
 
 good 
 fair 
 good 
 fair 
 good 
 
 226 
 229 
 
 233 
 246 
 247 
 251 
 
 254 
 261 
 268 
 
 269 
 
 278 
 
 5 
 9 
 15 
 19 
 23 
 32 
 
 4i 
 
 46 
 63 
 70 
 86 
 
 98 
 
 105 
 112 
 128 
 
 131 
 
 144 
 
 153 
 155 
 164 
 26 
 50 
 
 61 
 
 79 
 90 
 1 08 
 141 
 168 
 
 182 
 195 
 204 
 
 220 
 
 39 
 97 
 103 
 126 
 
 "34 
 
 O.22 
 O.26 
 
 O.29 
 
 O. IO 
 -f-O. 12 
 + O.OI 
 
 + 0.01 
 
 + 0.19 
 
 O.OI 
 + O.O2 
 
 O.O7 
 
 -0.53 
 O.22 
 O.O9 
 -0.03 
 
 o. 29 
 o. 29 
 
 0.50 
 
 -0.48 
 -0.30 
 
 O.22 
 -0.47 
 
 0.36 
 0.40 
 
 -0-45 
 O.2O 
 O. 21 
 
 + 0.15 
 -0.40 
 -0.13 
 -O.62 
 
 o. 19 
 
 -0.32 
 + 0.17 
 + 0.13 
 
 -O.O2 
 + 0.06 
 
 + o 25 
 
 + 0.31 
 
 -0.84 
 -O.2I 
 + 0.32 
 -O.OI 
 O.OI 
 
 32-5, 36.6, 35.7 .) 
 35 o ) 
 
 04, 1/2, vb, D5d 
 
 O3D hiv v^d 
 
 38.0, 39.0, 39. 7. . 
 39.0, 38.0, 38.7..) 
 37-5, 37-o, 37-7-- 
 39-0, 39-7, 40. 5-- I 
 38.0, 38.0, 39.2..) 
 39-0, 39-5, 39-7-- 
 39-0, 37-0, 38.7-- 
 39-5, 38-2, 39-5- 
 39-0, 37-7, 38-0.) 
 40.0, 38.7, 39.0. .) 
 38-5, 38-7 I 
 39-0, 37-7, 38.0..) 
 40.0, 40.7, 40.5.. . . 
 38.0, 37.7 
 35-0, 35.2, 37.6.. . . 
 33-0, 34-7, 35-6.. . . 
 36-0, 34.7, 34.6.. . . 
 32-7, 32-6, 33.5.. . . 
 31.6, 32.7, 32.5,^ 
 3 9 ) 
 
 04511, 62D, i/3d 
 ayv, D5d, 7/1-26 
 041;, biv, D4~sd 
 ayv, DO-i6, Ti^d 
 O3D, 621), tiifd, 
 02-31), 1)3-40", DO 1 6 
 031), 1130", 6ii) 
 0211, 1140", 1)6 
 0341), 1)40" 
 031), 1)30", 611) 
 
 O21), 1)6d, DI26 
 
 611), 1)30" 
 641), Do-id, D4C 
 66i>, i)d, D2C 
 6311, lid, DIC 
 
 d2D, CID, 1>4/ 
 C2T. D2. D-*/. D4. \l . . . -\ 
 
 C3D, DI 2, D2/ 
 /21), D4~ 5W 
 /5D, D2TO, D4/1 
 
 30.6, 32.2, 28.5. . . . 
 24-5, 25.0 
 21.5, 22.5, 22.9. ... 
 
 B-IOD, DTO, D2/I 
 kyv, DI-2& 
 
 &4D, DI&, limit 3 < k ... . . 
 vk 
 
 '7-5. 20.5, 20.2.. . . 
 
 15.9, 15-8 
 
 14-9, !5-3 
 
 k2yv, limit D 
 
 
 k2 31), limit D 
 
 
 D not seen, limit 3 < h . . 
 
 
 v not seen, limit 2<fc . . 
 
 
 D not seen, limit i 2<h. 
 
 
 D not seen limit h . . . 
 
 
 ^4-5', dye 
 
 '3", ^-5* 
 lyv, 1)4 sA 
 
 A3D, 1>l 
 &2D, D2ife 
 
 &ID, limit i 2<D , . . 
 
 31-0, 3i-7 
 23-5, 23.4 
 21.5, 23 4 
 15-9, '5-3 
 16.9, 16.3 
 
 51), III) 
 &2D DI 2X 
 
 93, 9-0 
 12 i ii =; 
 
 &5-6D, DI-2* 
 
 AO-ID, 1)4 5& 
 
 13-4, 15-8 
 18 4 18 8 
 
 D&, /4D 
 DO-lA, l(t-SV 
 ZlD, TtSk 
 /2D 
 
 18.9, 22.5 \ 
 19 4, 19-5 / 
 25-5, 26.9 ) 
 
 24. ^ 1 
 
 /5i> vfth 
 
 
 k2V, limit v 
 
 
 k^TI, TO- IX 
 
 &4D, limit D 
 
 JO-3, 10.5 
 
 k$v, vo-ix 
 
 10.3, 10.5 
 
22 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE n. 103 T ANDROMEDA. VISUAL OBSERVATIONS OF THE VARIABLE Continued. 
 
 No. 
 
 Date. 
 
 1 
 
 O 
 
 I 
 
 & 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 ' 
 
 d Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C.S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 92 
 93 
 94 
 95 
 
 96 
 
 97 
 
 98 
 99 
 
 IOO 
 101 
 IO2 
 
 103 
 104 
 105 
 
 106 
 
 107 
 
 108 
 109 
 
 IIO 
 
 III 
 
 112 
 
 "3 
 
 114 
 
 "5 
 
 116 
 
 118 
 119 
 1 20 
 
 121 
 122 
 123 
 124 
 
 125 
 126 
 127 
 128 
 129 
 130 
 
 132 
 133 
 134 
 135 
 136 
 
 '37 
 138 
 139 
 
 1897 
 Sept. 16 
 20 
 
 24 
 29 
 Oct. 14 
 
 23 
 25 
 
 29 
 Nov. n 
 
 17 
 20 
 Dec. 29 
 
 1898 
 Jan. i 6 
 
 23 
 Feb. 5 
 
 24 
 Mar. 4 
 
 '3 
 Aug. 29 
 Sept. 8 
 Oct. 1 1 
 
 Nov. 5 
 
 19 
 Dec. 3 
 
 22 
 1899 
 
 Jan. 2 
 9 
 24 
 Feb. 15 
 28 
 Mar. 7 
 Aug. 10 
 18 
 Sept. i 
 
 13 
 Oct. 2 
 
 7 
 23 
 30 
 Nov. 4 
 20 
 
 27 
 Dec. 6 
 
 19 
 23 
 29 
 
 1900 
 Jan. i 
 
 22 
 
 24 
 
 7 
 8 
 8 
 8 
 7 
 
 7 
 6 
 
 7 
 
 7 
 7 
 7 
 7 
 
 6 
 
 7 
 7 
 7 
 7 
 8 
 8 
 
 7 
 6 
 
 7 
 6 
 
 6 
 6 
 6 
 6 
 
 8 
 7 
 9 
 8 
 8 
 
 7 
 8 
 
 7 
 7 
 7 ' 
 
 7 
 7 
 7 
 7 
 7 
 7 
 7 
 
 6 
 
 7 
 7 
 
 2410000+ 
 4184.54 
 4188.58 
 4192.58 
 4197-58 
 4212.54 
 
 4221.54 \ 
 4223. 50 -s 
 
 4227-54 I 
 4240.54 
 4246.54 
 
 4288.54 
 
 4306.54 
 4313.50 
 4326.54 
 4345-54 
 4353-54 
 4362.54 
 4531.58 
 454I-58 
 4574-54 
 4599-50 
 
 46I3-54 
 4627.54 
 4646 . 50 
 
 4657 50 
 4664.5 
 
 4679.5 
 470i . 5 
 47I4-58 
 4721-54 
 4877-63 
 4885.58 
 4899.58 
 4911.56 
 4930.58 
 4935 54 
 4951.54 
 4958 - 56 
 4963-56 
 
 4979-54 
 4986.54 
 
 4995 54 
 5008.54 
 5012.54 
 5018.52 
 
 5021.50 
 5042 . 54 
 5044.54 
 
 150 
 150 
 150 
 150 
 150 
 40 
 15 
 15 
 80 
 80 
 40 
 150 
 40 
 40 
 40 
 40 
 
 40 
 40 
 
 150 
 40 
 150 
 40 
 40 
 80 
 40 
 40 
 40 
 15 
 
 150 
 150 
 150 
 150 
 150 
 150 
 40 
 40 
 40 
 40 
 40 
 40 
 150 
 150 
 150 
 150 
 200 
 150 
 200 
 200 
 200 
 
 200 
 150 
 150 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 
 4 51*, ac not seen 
 
 
 9-8 
 13.2 
 14.4 
 16.1 
 16.8 
 
 17.0 
 18.8 
 
 19.6 
 
 23.7 
 27.6 
 28.3 
 41.2 
 
 39-2 
 37-o 
 32.1 
 30.1 
 25.0 
 22.5 
 25-8 
 
 27. 2 
 39-4 
 37-8 
 S3- 2 
 27.6 
 23.0 
 
 21 . I 
 19.2 
 14.4 
 10.3 
 
 9-8 
 
 38.2 
 36-6 
 
 34-4 
 31.8 
 26.2 
 24.0 
 19.9 
 16.6 
 15.6 
 
 12.6 
 II .2 
 II . 2 
 
 "3 
 IO.2 
 
 10. 
 
 , 9 ' 8 
 II.9 
 
 12.90 
 12.38 
 
 1 2. 2O 
 11.97 
 
 11.85 
 
 11.80 
 11.56 
 
 "45 
 
 10.84 
 IO.27 
 
 10. 17 
 
 8.28 
 
 8-57 
 8.90 
 9.60 
 9.89 
 10.63 
 1 1. 02 
 10.52 
 10.31 
 
 8.54 
 8.78 
 
 9-47 
 10.27 
 10.94 
 
 n .20 
 11.50 
 
 12. 2O 
 I2.8I 
 12.89 
 
 <n.8 
 8.72 
 8.98 
 9.27 
 9.64 
 10.47 
 10.63 
 n .40 
 11.88 
 12.03 
 12.48 
 12.69 
 12.69 
 12.67 
 12.82 
 12.86 
 
 12.89 
 
 <I2.9 
 
 12.59 
 
 fair 
 good 
 good 
 good 
 good 
 
 good 
 good 
 
 good 
 
 good 
 good 
 good 
 good 
 
 good 
 good 
 fair 
 fair 
 fair 
 fair 
 moon 
 fair 
 good 
 good 
 good 
 good 
 good 
 
 poor 
 fair 
 moon 
 moon 
 low 
 
 fair 
 moon 
 fair 
 good 
 good 
 good 
 good 
 good 
 fair 
 poor 
 good 
 good 
 fair 
 fair 
 
 good 
 poor 
 good 
 
 153 
 '57 
 161 
 1 66 
 
 181 
 
 190 
 191 
 
 196 
 
 209 
 
 215 
 
 218 
 
 257 
 
 275 
 o 
 
 13 
 32 
 40 
 
 49 
 218 
 228 
 261 
 
 4 
 18 
 32 
 51 
 
 62 
 69 
 84 
 1 06 
 119 
 126 
 o 
 8 
 
 22 
 
 34 
 53 
 58 
 
 74 
 81 
 86 
 
 102 
 IO9 
 
 118 
 131 
 135 
 141 
 
 144 
 165 
 167 
 
 + O. 22 
 -0.27 
 -0.38 
 -0.52 
 
 o. 29 
 
 + 0.03 
 
 o. 14 
 
 0.04 
 0.04 
 
 -0.27 
 
 o. 20 
 
 o. 24 
 
 -0.13 
 
 +0.08 
 +0.48 
 
 + 0. II 
 
 +0.53 
 
 + 0.60 
 + o. 15 
 
 +0.51 
 
 + O.OI 
 O. II 
 
 + o. 19 
 
 +0.47 
 +0.42 
 
 +0.25 
 +0.30 
 
 +0.43 
 +0.28 
 + 0.16 
 
 O.OI 
 O.O2 
 
 -0.13 
 
 0.23 
 0.15 
 -0.18 
 o.oo 
 +0.19 
 +0.13 
 +0.03 
 +0.09 
 0.04 
 o. 14 
 
 + O.OI 
 
 + 0.06 
 + 0.09 
 
 + O. II 
 
 &2K, 1)4*, limit x 
 kiv v$x, h^v 
 
 12.3, 14.0 
 13.3, 15.0, 14.9.. . . 
 
 16.3- 15.9 
 16.3, 17.4 
 
 V2k, hyv 
 
 V2k, hi 2V 
 
 
 16.9, 16. 3 . . . ) 
 
 hi 2V, V^k 
 
 ho iv v$k ") 
 
 17-4, 17-3 i 
 18.4, 19 3 
 
 hin, mo, oip, piq, qk. ';- 
 k\r, k2t, Is ) 
 
 17-9, 20.3 ) 
 20.5, 19.9 ) 
 22.9, 24.5 
 26.5, 29.7 
 28 . o, 28 7 
 
 hiv, v6k 
 
 v^h, hv 
 vl, d6v 
 vi 2/ d6v 
 
 V2b, aoiv 
 
 
 ayv, vo-ib, 046 
 
 6O-IT, V2d, V&l 
 
 39-0, 39-5 
 38-5, 36-7, 34-5 - - 
 32-7, 3i-5 
 30-7, 29.5 
 
 d^v, v$l 
 
 /I 21? 
 
 IdV 
 
 
 hv, vis, uncertain 
 
 vl c$v 
 
 25.5, 26.1 
 26 5 28 6 
 
 0341), v^d, 1/26 
 61 2V, 1)3 4<i 
 6451?, i?3/, do-in, TIC... 
 
 38.5, 38.7, 41.0 .. 
 37-5, 38.2 
 34-5, 29.5, 34.2, 34.6 
 
 2Q 7. 2S S . 
 
 ;P_' fr 
 
 22. 0, 23.9 
 
 ly>, vih 
 
 23-5, '9-9 
 19-5, 17.3, 20.9 . . 
 l6 4. 12 T, 
 
 41? limit i? 
 
 
 4 51? limit v . . 
 
 
 v not seen, limit 1-2 < h . 
 a^v vb v$d 
 
 
 38.0, 39.0, 37.7. . 
 36.5, 36.7 
 
 35-0, 33-7, 34-6. .. 
 30.7, 34.1, 30.5. . . 
 28.1, 26.5, 23.9 . . 
 24-5, 23.4 
 20.5, 20.9, 18.3 . . 
 16 4, 16 8 . 
 
 62-31?, V2d 
 6411, div, vie 
 dq.v, vo-ic, i?4/ 
 05-61?, vl, v$h 
 
 /2D, 1)45/1 
 
 /6f, i?2^, i?4& 
 
 h2v, vk, x not held .... 
 
 klV, V2X 
 
 kyv, vix 
 
 16.9, 14.3 
 13-3, 12.0 
 11.3, n. o 
 11.3, 11. o 
 
 
 
 41? vx limit v or x .... 
 
 10. 3, 10.0 
 
 xoiv limit v 
 
 
 51?, DO-I* 
 v not seen limit k 
 
 9-3, 10.3 
 
 631?, D2-3*, limit x 
 
 II- 3, 12-5 
 
CHAPTER II. T ANDROMEDA. 
 
 TABLE n. 103 T ANDROMEDA. VISUAL OBSERVATIONS OP THE VARIABLE Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 tj 
 
 I 
 
 Comparisons. 
 
 x 
 Reduction, Steps, 
 
 Means. 
 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day 
 
 Hom- 
 CS. T 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 Seeing 
 
 140 
 141 
 142 
 143 
 144 
 145 
 146 
 
 147 
 148 
 149 
 150 
 151 
 
 152 
 
 i53 
 154 
 155 
 156 
 
 157 
 158 
 i59 
 1 60 
 161 
 162 
 163 
 164 
 
 165 
 1 66 
 167 
 
 168 
 169 
 170 
 171 
 172 
 173 
 174 
 175 
 176 
 177 
 178 
 179 
 1 80 
 
 1900 
 Feb. 15 
 26 
 May 20 
 June 25 
 July 30 
 Aug. 26 
 Sept. 15 
 Oct. 10 
 18 
 Nov. 21 
 Dec. n 
 29 
 
 1901 
 Feb. 9 
 
 1903 
 Feb. 1 6 
 
 24 
 Oct. 1 1 
 
 13 
 
 1904 
 Aug. 29 
 Sept. ii 
 Oct. 6 
 27 
 30 
 30 
 3i 
 Nov. i 
 
 2 
 
 '4 
 2 9 
 
 1905 
 
 Jan. 14 
 28 
 Feb. 25 
 Mar. 3 
 May 22 
 June 10 
 
 27 
 July 30 
 Aug. 9 
 28 
 Sept. 17 
 
 Oct. 20 
 
 Nov. 21 
 
 7 
 7 
 14 
 14 
 10 
 8 
 7 
 7 
 1 1 
 
 7 
 7 
 6 
 
 9 
 
 8 
 8 
 
 8 
 10 
 
 8 
 6 
 6 
 
 6 
 
 7 
 
 6 
 
 9 
 
 8 
 
 7 
 7 
 15 
 15 
 15 
 
 12 
 14 
 
 9 
 
 8 
 8 
 6 
 
 2410000 + 
 5066.54 
 
 5077.54 
 5160.83 
 5196.83 
 5231-67 
 5258-58 
 5278.54 
 5303 54 
 53ii-7i 
 5345-54 
 5365-54 
 5383-50 
 
 5425-63 
 
 6162. 
 6170.58 
 6399-58 
 6401 . 
 
 6722.58 
 6735 67 
 6760. 
 6781.58 
 6784.50 
 6784.50 
 
 6785-54 
 6786.50 
 
 6787.54 
 6799. 
 6814.50 
 
 6860.63 
 6874.58 
 6902 . 54 
 6908 . 54 
 6988.88 
 7007 . 88 
 7024.88 
 
 7057-75 
 7067.83 
 7086.63 
 7106.58 
 7I39-58 
 7I7I-50 
 
 150 
 150 
 40 
 40 
 40 
 150 
 150 
 150 
 237 
 15 
 40 
 
 40 
 
 40 
 
 '67 
 
 150 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 40 
 6 
 6 
 6 
 
 6 
 
 24 
 12 
 6 
 
 h2TJ, 112k 
 
 16 . o. 16 "} . . 
 
 16.6 
 
 19- 
 37-6 
 29.8 
 
 22.2 
 12.3 
 
 9- 
 <I3 
 
 II . 2 
 17.2 
 
 23-4 
 26.5 
 
 39-3 
 
 11.89 
 
 ii 5 
 
 8.80 
 
 9-94 
 ii .07 
 12.52 
 13.0 
 
 <I2.4 
 
 12.67 
 11.79 
 10.88 
 10.42 
 
 8-57 
 
 IS- 2 
 I3.I7 
 12. 8l 
 
 fair 
 poor 
 fair 
 good 
 good 
 fair 
 good 
 moon 
 fair 
 good 
 good 
 good 
 
 fair 
 
 good 
 good 
 
 189 
 
 200 
 
 2 
 38 
 72 
 
 99 
 119 
 
 144 
 152 
 1 86 
 206 
 224 
 
 266 
 
 157 
 165 
 112 
 
 + 0.06 
 
 + 0.2 
 O.O7 
 + 0.08 
 0.30 
 + 0.15 
 + 0.27 
 
 -0.03 
 
 o. 14 
 
 -0.13 
 +0.39 
 
 O.O2 
 
 + 0.67 
 + 0.04 
 
 vh 
 
 
 bin, 112 ^d 
 
 Cl 2V, Till 
 
 l$v, 114/1 
 k2i>, limit v 
 
 38.0, 37.2 
 32.1, 27.5 
 21.5, 22.9 
 
 v glimpsed, k$v . * 
 
 
 11 not seen, limit l<.k 
 
 
 k^ll, TJ2X 
 tl2T), T2k, 16811 
 
 10.3, 12.0 
 16.9, 16.3, 19.5 . 
 2^ . 5. 2T. 3 . . 
 
 /3f, i>8 lok 
 
 vl 
 
 
 bv, V4-5<f, Tide 
 
 39-o, 39-2, 39.6 .. 
 
 photograph 
 
 X2V , limit v 
 
 
 8.0 
 10.3 
 
 k^v, limit 1} . . 
 
 
 
 
 150 
 
 67 
 
 40 
 40 
 
 460 
 
 67 
 67 
 67 
 
 40 
 
 237 
 237 
 237 
 
 67 
 
 250 
 237 
 237 
 237 
 150 
 150 
 150 
 
 80 
 150 
 
 6 
 12 
 6 
 6 
 6 
 40 
 12 
 12 
 12 
 12 
 6 
 
 40 
 40 
 40 
 12 
 40 
 40 
 40 
 4 
 
 6 
 6 
 6 
 
 12 
 
 6 
 
 v not seen, limit 6 < h . . 
 
 
 <I3 
 
 < 7-0 
 < 10 
 
 13-4 
 13-6 
 13 6 
 
 <I2.4 
 
 <i3-3 
 
 <I2.9 
 
 12.36 
 12.34 
 12.34 
 11.89 
 
 I 2. O2 
 11.84 
 
 ii. 3 
 i-45 
 
 8.42 
 8.58 
 9.69 
 
 IO. I I 
 
 12.70 
 13.18 
 12.86 
 11.87 
 ii . 14 
 ii .04 
 9.68 
 
 8.12 
 
 8.70 
 
 poor 
 good 
 good 
 fine 
 
 good 
 
 good 
 good 
 fair 
 
 fair 
 
 fair 
 good 
 good 
 fair 
 moon 
 fair 
 fair 
 good 
 good 
 fair 
 poor 
 good 
 good 
 
 153 
 1 66 
 191 
 212 
 
 215 
 216 
 216 
 
 217 
 230 
 245 
 
 9 
 23 
 51 
 57 
 137 
 156 
 173 
 206 
 216 
 235 
 255 
 6 
 38 - 
 
 + i-'6 5 
 + 1.78 
 -i .40 
 + 1.53 
 + 1.38 
 
 + ^87 
 
 -0.58 
 -0.85 
 -0.82 
 
 -0.59 
 -0.08 
 (-0.51 
 
 fO.52 
 
 f 0.86 
 fo.65 
 f 1.64 
 
 fi.15 
 -0.78 
 
 -1.3 
 
 11 not seen, limit 3 < x . . . 
 
 
 11 not seen, limit x 
 
 
 ko-m, 1131 
 nk, vyc 
 kv, V3X 
 photometer 
 
 13.8, 13.0 
 14-3, '3-o 
 14-3, 13-0 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photographs 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 e$ii, 113-41 
 
 kSv V2X 
 
 25-7! 30.0 
 
 6.3, 12 O ... 
 
 27.9 
 10.9 
 
 IO.O 
 
 16.3 
 
 21.6 
 22.2 
 
 31-4 
 42.O 
 38.2 
 
 
 9.0, (13.15, 13.38). 
 IO O 
 
 
 112k . 
 
 
 18iov i>6k, u^h 
 
 (15.5), 20.3, 22.9 
 
 22.3, 19-3, 23.5, 21.5 
 29.2, 33-7 
 
 v$k vjt V3m l$i> 
 
 ei-2V, dm 
 Da 
 
 af>i>, bv, v^d 
 
 36.0, 39.0, 38.7 .. 
 
24 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 The whole time covered by the observations, starting from the first, was divided 
 into parts corresponding in length with the star's assumed period. The quantity 
 t in the twelfth column is the time elapsed in days since the beginning of each 
 of these parts. The last column, " j:Mag," gives the residual between the ob- 
 served magnitude and the reading from the mean light-curve corresponding to 
 the time t. 
 
 Table 12 gives the data for finding the mean light -curve, following the form 
 used by Turner in his reductions of the Rousdon variable star observations' 
 with some additions. Dividing the assumed period, 282 days, into twelve parts 
 we have in this case 23.5 day groups. The heading of Table 12 gives in two 
 lines the number of the group and the day number corresponding to the last 
 
 MAGNITUDE 
 
 T ANDFtOMEDAE 
 
 FIG. 4. MAGNITUDE-CURVE FOR T ANDROMEDA. 
 
 day of the group. The first column gives the Julian day of the beginning of 
 each period, starting from an arbitrary date, the first observation. Then follow 
 for each group of each period, the mean t and magnitude in the Harvard system 
 (found by averaging the quantities in the last two columns of Table 1 1 for the 
 interval covered by the group) J M, the difference between the mean magnitude 
 and the reading from the mean light-curve for the time t, and the number of 
 nights ' observations in the group. Finally, at the foot of the table will be found 
 the general means of the tabulated quantities t, M and 4 M, followed by the 
 total number of observations in each group. These general means of t and M are 
 platted to form the mean light-curve (fig. 6, page 27). 
 
 ' Memoirs of the Royal Astronomical Society, vol. 55, lix et seq. 
 
CHAPTER II. T ANDROMEDA. 
 
 a, si, 
 00 o 
 
 ~ <0 
 
 o 
 
 <n <5 
 co o 
 
 ~ 
 
 
 r 
 
 ^_ 
 
 o 
 m 
 
 
 
 00 
 en f> 
 
 I 
 
 Z 
 
 K i 
 
 s 
 
 o 5; 
 
 CO " 
 
 FlG. 5. LlGHT-CURVB OF T ANOROMKU.'li. 
 
26 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 12. MBAN MAGNITUDES PROM 23.5 DAY GROUPS. 
 
 Group No. . . . 
 T D 
 
 i 
 
 27 S 
 
 2 
 
 47 
 
 3 
 70.5 
 
 4 
 94 
 
 5 
 117.5 
 
 6 
 
 141 
 
 7 
 164.5 
 
 8 
 1 88 
 
 9 
 
 211.5 
 
 IO 
 
 2 35 
 
 II 
 
 258.5 
 
 12 
 282 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r / 
 
 
 
 
 
 
 
 
 
 
 
 251 
 
 274 
 
 M 
 
 
 
 
 
 
 
 
 
 
 
 8.77 
 
 8.61 
 
 2 93 JM 
 
 
 
 
 o ^o 
 
 
 
 
 
 
 
 + 0.15 
 
 0.08 
 
 L No 
 
 
 
 
 
 
 
 
 
 
 
 4 
 
 4 
 
 r t 
 
 
 
 62 
 
 
 
 
 
 
 
 223 
 
 250 
 
 269 
 
 M 
 
 8 88 
 
 
 
 
 
 
 
 
 
 9.66 
 
 8.65 
 
 8.66 
 
 3 I8 5 \ JM 
 
 o 18 
 
 
 
 
 
 
 
 
 
 0.28 
 
 + O.OI 
 
 + 0.03 
 
 L No 
 
 
 
 i 
 
 
 
 
 
 
 
 4 
 
 4 
 
 4 
 
 I/ 
 
 
 if) 
 
 66 
 
 86 
 
 
 
 
 
 
 
 
 
 * 
 
 M 
 
 8 88 
 
 
 10 86 
 
 
 
 
 
 
 
 
 
 
 JM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Nn 
 
 
 
 
 i 
 
 
 
 
 
 
 
 
 
 3749 ] 
 I No. 
 
 I M 
 
 
 26 
 9.70 
 + 0.15 
 I 
 
 39 
 
 IO QI 
 
 56 
 10.96 
 + 0.26 
 
 2 
 
 8 4 
 11.96 
 
 + O.22 
 2 
 
 108 
 
 12. 27 
 O.22 
 
 I 
 
 IOO 
 
 12 86 
 
 141 
 12.97 
 + 0.17 
 
 i 
 
 130 
 
 12 3O 
 
 157 
 
 12 52 
 
 175 
 12.36 
 + 0.08 
 
 i 
 
 i74 
 11.91 
 
 200 
 11.48 
 + 0.16 
 
 2 
 
 196 
 II .41 
 
 220 
 10.56 
 + 0.31 
 i 
 
 216 
 
 IO.22 
 
 257 
 8.28 
 
 275 
 8.57 
 
 4031 1 ,rj 
 JM 
 
 I No. 
 
 r , 
 
 6 
 
 + 0.84 
 i 
 
 ?6 
 
 4.O 
 
 
 + 0.26 
 
 2 
 
 O.OO 
 2 
 
 O. 12 
 3 
 
 o 42 
 
 2 
 
 0.05 
 
 4 
 
 O.24 
 
 2 
 
 2. 23 
 
 0.24 
 
 i 
 
 -0.13 
 i 
 
 261 
 
 
 O 2^ 
 
 10 26 
 
 1 1 . 02 
 
 
 
 
 
 
 
 10.42 
 
 
 8-54 
 
 JM 
 
 f-o 28 
 
 + 032 
 
 + o 60 
 
 
 
 
 
 
 
 + 0.33 
 
 
 + O.OI 
 
 L No 
 
 2 
 
 
 I 
 
 
 
 
 
 
 
 2 
 
 
 i 
 
 r * 
 
 
 
 61 
 
 84 
 
 
 
 
 
 
 
 
 
 
 
 
 
 12 28 
 
 12 8l 
 
 12 89 
 
 
 
 
 
 
 
 4595 JM 
 
 
 
 -\- O "\2 
 
 4-O A'l 
 
 + o 28 
 
 + o 16 
 
 
 
 
 
 
 
 L Mn 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r / 
 
 
 
 c6 
 
 8O 
 
 106 
 
 128 
 
 
 167 
 
 IQA 
 
 
 
 
 A&77 ;' M 
 
 8 98 
 
 
 
 
 12 C8 
 
 
 12 88 
 
 12 =10 
 
 1 1 7O 
 
 
 
 
 JM 
 
 
 
 
 
 _j_ o 05 
 
 
 + o 08 
 
 -f-o 16 
 
 + O I ^ 
 
 
 
 
 L No 
 
 
 
 
 
 
 
 
 i 
 
 2 
 
 
 
 
 f ' 
 
 5159 J M 
 I JM 
 L No. 
 
 r t 
 
 2 
 8.80 
 O.O7 
 I 
 
 38 
 
 9-94 
 0.08 
 i 
 
 
 72 
 
 n .07 
 
 -0.30 
 
 I 
 
 99 
 12.52 
 -4-0. 15 
 I 
 
 119 
 
 13 
 
 + 0.27 
 
 I 
 
 52 
 12.67 
 0.03 
 i 
 
 1 86 
 11.79 
 -0.17 
 i 
 
 165 
 
 2O6 
 
 10.88 
 -0.13 
 
 i 
 
 224 
 10.42 
 + 0.39 
 I 
 
 
 266 
 
 8.57 
 
 O.O2 
 I 
 
 
 
 
 
 
 
 
 
 T -3 17 
 
 
 
 
 
 JM 
 
 
 
 
 
 
 
 
 + o 67 
 
 
 
 
 
 L No 
 
 
 
 
 
 
 
 
 i 
 
 
 
 
 
 r / 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6287 J M 
 
 
 
 
 
 12 8l 
 
 
 
 
 
 
 
 
 ] JM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 L No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r / 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6851 J M 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1 JM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 L No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r t 
 
 Means j ' M 
 1 JM 
 L No. 
 
 9 
 8.97 
 
 + O.O2 
 2O 
 
 34 
 9-93 
 + 0.05 
 
 19 
 
 57 
 10.75 
 o.oo 
 
 15 
 
 79 
 "57 
 0.03 
 
 9 
 
 105 
 
 12.55 
 
 + O.O2 
 II 
 
 128 
 12.84 
 + 0.05 
 
 IO 
 
 150 
 
 12.69 
 
 + O.OI 
 
 6 
 
 '73 
 12.36 
 0.09 
 6 
 
 199 
 
 "37 
 + 0.03 
 
 9 
 
 2 2O 
 IO.22 
 + O.IO 
 IO 
 
 253 
 
 8-57 
 0.03 
 
 9 
 
 268 
 8.60 
 0.04 
 II 
 
CHAPTER II. T ANDROMEDA. 
 
 too 
 
 DAYS 
 
 zoo 
 
 300 
 
 4-00 
 
 ANDROMCDAE 
 
 M . ^S8 ef 
 m = /32 
 M-m- /26 
 
 COMPLETE LIGHT-CURVE. 
 (Fig- 5, page 25.) 
 
 This is formed by platting the magnitudes (in the Harvard system) from Table 
 1 1 , and indicating the limit of visibility when the variable was not seen by the 
 point of the V-shaped character. A smooth curve drawn through the platted 
 points shows the light changes of the variable. When the number of observations 
 is insufficient to give an accurate 
 curve, it is drawn with a broken 
 line by the aid of the mean curve. 
 The dates and magnitudes of max- 
 ima and minima given in Table 13 
 are taken from this light -curve. The 
 correction to the ephemeris, given 
 in the sixth column, is calculated 
 from the elements at the head of 
 the table, with the corrected period 
 284 days. The weight in the sev- 
 enth column results from the num- 
 ber of observations combined with 
 their symmetry with respect to the 
 maximum or minimum. In case of 
 a symmetrical distribution the 
 weight is f times the number. If 
 the observations all lie on one side 
 the weight is \ the number. In 
 case the date of maximum or mini- 
 mum depends on the mean curve, 
 the letters "me" are placed in the 
 magnitude column. 
 
 TABLE 13. 103 T ANDROMEDA. 
 Elements of maximum. 
 
 LJ 
 O 
 
 D 
 h 
 
 O 
 
 /2 
 
 I3 
 
 FIG. 6. MEAN LIGHT-CURVE OF T ANDROMEDA. 
 
 OBSERVED MAXIMA AND MINIMA. 
 
 1894 Nov. 28 (J. D. 2413161) + 284<>X(E-S1)- 
 
 M-m=126 4 
 
 MAXIMA. 
 
 MINIMA. 
 
 i 
 
 Date. 
 
 Mag. 
 
 
 
 | 
 
 Date. 
 
 Mag. 
 
 
 Wt 
 
 a 
 
 H 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 Lorr. 
 
 
 | 
 
 W 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 
 
 50 
 
 1894 Mar. 2 
 
 2890 
 
 
 me 
 
 + 13 
 
 6 
 
 5 
 
 1894 July 26 
 
 3036 
 
 
 me 
 
 + i 
 
 2 
 
 
 51 
 
 Dec. 3 
 
 V66 
 
 8 49 
 
 8.S7 
 
 + 5 
 
 24 
 
 52 
 
 1895 May 6 
 
 3320 
 
 
 me 
 
 + i 
 
 7 
 
 52 
 53 
 
 54 
 
 1895 Sept. 9 
 1896 June 13 
 1897 Mar. 21 
 
 3446 
 3724 
 4005 
 
 8.58 
 
 8.66 
 me 
 me 
 
 + i 
 
 - 5 
 
 - 8 
 
 28 
 
 2 
 
 3 
 
 53 
 54 
 55 
 
 1896 Feb. 14 
 1896 Nov. 24 
 1897 Aug. 1 6 
 
 3604 
 3888 
 4'53 
 
 
 me 
 12.98 
 12.90 
 
 + i 
 + i 
 -18 
 
 6 
 15 
 i? 
 
 12.90 
 12.82 
 
 55 
 
 Dec. 31 
 
 4290 
 
 8.3 
 
 8.38 
 
 7 
 
 13 
 
 56 
 
 1898 June 3 
 
 4444 
 
 
 me 
 
 ii 
 
 i 
 
 
 56 
 
 1898 Oct. 18 . 4581 
 
 8.32 
 
 8.40 
 
 o 
 
 10 
 
 57 
 
 1899 Mar. it 
 
 4725 
 
 12.9 
 
 13-0 
 
 - '4 
 
 4 
 
 57 
 58 
 59 
 
 1899 July 22 
 1900 Apr. 29 
 1901 Feb. 2 
 
 4858 
 5139 
 5417 
 
 
 me 
 8.6 
 me 
 
 - 7 
 10 
 -16 
 
 4 
 7 
 
 2 
 
 58 
 
 59 
 62 
 
 Dec. 25 
 1900 Sept. 28 
 1903 Feb. 14 
 
 5014 
 5291 
 6160 
 
 12.90 
 13.00 
 13.2 
 
 12.98 
 13.08 
 13.3 
 
 - 9 
 -16 
 
 + i 
 
 20 
 IO 
 
 I 
 
 64 
 
 1905 Jan. 14 
 
 6860 
 
 
 me 
 
 + 7 
 
 2 
 
 64 
 
 1904 Sept. 6 
 
 6730 
 
 
 me 
 
 + 3 
 
 5 
 
 
28 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 14. PHOTOMETRIC MEASURES AND COLOR OF COMPARISON STARS. 
 
 Star. 
 
 H. C. O. 
 37,i5i 
 
 Lindemann 
 + 0.18 
 A. N. 139,345 
 
 H. M. 
 Parkhurst 
 A. J. 15,77 
 
 J. A. Parkhurst. 
 
 Yendell, 
 Visual 
 A. J. 15, 9 3 
 
 Color, 
 Plates 
 1 49 and 150 
 
 Hagen. 
 
 H. 
 
 P. 
 
 a 
 6 
 c 
 d 
 e 
 I 
 s 
 t 
 k 
 y 
 v 
 
 8.08 
 8.45 
 
 8.03 
 8 80 
 
 9 29 
 
 8.5' 
 8.76 
 
 9.26 
 
 7.98 
 8.72 
 
 9 5i 
 9.12 
 
 IO.20 
 10.15 
 10.32 
 
 11.66 
 11.85 
 13.12 
 
 8.06 
 
 8.80 
 
 9 59 
 9. 20 
 10.28 
 10.23 
 10.40 
 11.74 
 
 " 93 
 13.20 
 
 8.18 
 8. 10 
 9.07 
 8.58 
 9.60 
 
 10. 2O 
 
 + 0.37 
 
 O.O2 
 0.03 
 + 0. II 
 0.08 
 + O. I I 
 + 0. IO 
 
 + 0.08 
 0.09 
 
 + 0.52 
 
 8.1 
 
 8.5 
 9.0 
 8.8 
 9-7 
 9-9 
 
 IO.O 
 
 12.4 
 12.5 
 
 9.01 
 
 
 
 10.62 
 
 12-34 
 12.50 
 
 13.89 
 
 
 
 
 12.55 
 
 
 
 
 
 
 
 
 
 Table 14 collects the other photometric measures of these comparison stars 
 which are known to the writer, adding Hagen 's and Yendell 's visual scales and 
 the measure of the color from a comparison of photographs taken on ordinary 
 and isochromatic plates. The Harvard results in the second column reveal a 
 considerable difference in scale, but reference to the volume cited shows that 
 the measures of the four faint stars depend on the single star d, which seems too 
 narrow a foundation. Again, before any larger aperture had been used on the 
 field, the writer selected the comparison star x with the 6-inch reflector, whose 
 limit of vision, as determined by all the photometer measures, lies between 12.8 
 and 13.0. If this is true the Harvard values for the faint stars are numerically 
 too large by at least three-quarters of a magnitude. 
 
 I/indemann's results were based on the magnitude 6.50 for the star B. D. 
 + 2623 (P. DM. 6.68) and are therefore increased byo.iSto bring them to the 
 Potsdam system. They show a very close agreement with my values in column P. 
 
 H. M. Parkhurst 's measures make the yellow star a about half a magnitude 
 fainter than the other values. The Purkinje phenomenon would seem to explain 
 the difference, as he used an extinction photometer, while the others used the 
 full light of the star. A difference in scale is also indicated by the single faint 
 star k, but this is entitled to a relatively small weight as it depends on only two 
 double extinctions, while the other stars have six to nine; and in other fields our 
 scales are in good agreement. 
 
 The writer's results are given in columns H and P on both the Harvard and 
 Potsdam scales. 
 
 Yendell 's visual scale is added for comparison. The color of the star a probably 
 accounts for his estimating it with a 4. 2 5 -inch aperture fainter than the star b. 
 
 The "Color" column gives the difference : Magnitude on ordinary plate minus 
 magnitude on isochromatic plate. It will be noticed that these differences are 
 within the combined accidental errors of the visual and photographic measures, 
 except for the stars a and v. At the present writing the data are insufficient for 
 expressing these color numbers on the usual decimal scale, but an idea of their 
 
CHAPTER II. T ANDROMEDA. 29 
 
 relation can be had from the coloration of the variable given by Yendell, 5.2, and 
 by the Gesellschaft Committee on Variables, 6.0. 
 
 Besides that here given, three light-curves have been published for the variable 
 near maximum. The curve first published by Pickering inAstrophysical Journal, 
 1, 305, 1895, was anomalous in character, consisting of two straight lines meeting 
 at the point of maximum. This curve has unfortunately gained some publicity 
 and been widely quoted, but seems to lack confirmation. Pickering's second curve 
 'n the same journal, 3, 281, is of a different character and agrees with that given 
 by Yendell in Astronomical Journal, 15,93, a l so with the curve here given. As 
 far as known, no other complete light-curve has been published, as observations 
 near minimum have been scarce. Those published by H. M. Parkhurst in the 
 Astronomical Journal, vols. 15 and 17, for epochs 53 and 54, number 9 and 8, 
 respectively. In Harvard Annals, 37, 206, the minimum of epoch 38 was observed 
 by Reed, who gives seven observations when the variable was fainter than the 
 eleventh magnitude. 
 
 The period 284 days satisfies the present set of observations better than the 
 shorter period 281 days given by Chandler, Pickering, and the Gesellschaft com- 
 mittee, and demanded by the B. D. observations of 1855. Hagen gives in the 
 catalogue sheet to the "Atlas" the elements of maximum: 
 
 1891 December 14 (2081) -j- 274 E. 
 
 This period is so much too short that the calculated maximum 1 7 falls at Julian 
 day 6739, only nine days after the observed minimum. 
 
 We conclude that at present the period is lengthening. 
 
CHAPTER III. 
 
 267 V ANDROMEDA. 
 R. A. oh 44 39.7* ; Dec. +35 6' 30" (1900). 
 
 The announcement of the discovery of this variable by Anderson was received 
 in the Astronomische Nachrichten, 142, 159, in January, 1897. Observations 
 began at once and the definitive notation was published by Chandler in Astronom- 
 ical Journal, If, 87, February, 1897. Some confusion arose from an apparent con- 
 tradiction between the observations of Yendell and the writer (noted by Hartwig 
 in the Vierteljahrsschrift, 32, 187), occasioned by a misidentification explained 
 in Astronomical Journal, 8 , 62. Some trouble may also arise from the fact that 
 the Chandler number of the star is given as 268 in the Nachrichten, 160, 335, and 
 in the Harvard Provisional Catalogue of Variables, Annals, 48, 96, whereas that 
 number was assigned by Chandler to X Sculptoris in the Journal, 17, 88. 
 
 As Hartwig 's observations of the star are not yet published, there are only 
 available for comparison three isolated observations by Esch in the Nachrichten, 
 160, 335,thestar being found invisible in February, 1902 (then 13 by my curve) 
 and 9.3, 1902 August 22. 
 
 The positions of the variable (relative to the star a, in Leyden A. G. Cat.) 
 and the brighter comparison stars were measured with the 6-inch, the fainter 
 stars with the 4o-inch, and all positions were checked from the photograph. 
 
 The three fundamental magnitude stars (Table 15) are white, which perhaps 
 accounts for the small residuals and the close agreement of the results with the 
 Potsdam values. 
 
 The mean light-curve was formed from the observations up to February, 1905. 
 It bears a close resemblance to that of T Andromedae, the only difference being 
 the length of the period. No halting in the regular change has been observed, 
 but there is a range of more than a magnitude in the brightness at different max- 
 ima and half a magnitude at the minima. A pair of ordinary and isochromatic 
 plates taken 1904 November 15, showed no color difference between the variable 
 and the comparison stars d, e, and m. 
 
 The revised elements given by Chandler in Astronomical Journal, ]Q, 94, 
 
 Max.=i896 Nov. 5 (3869) + 263 E 
 
 as well as Hartwig's ephemeris in Vierteljahrsschrift, 39, 262, call for a maximum 
 epoch 12, 1905 June 28. The observed date, May 5, though dependent on a 
 small number of observations, does not seem liable to an error greater than 10 
 days, so that the Chandler period is evidently too long. The present set of 
 observations are best satisfied by a period of 259 days, as given at the head of 
 Table 23. 
 
 3J 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 15. STANDARD MAGNITUDE .STARS. 
 
 
 
 1900. 
 
 
 Magnitude. 
 
 Residuals. 
 
 Star. 
 
 B. D. No. 
 
 RA 
 
 
 Color. 
 P. DM. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 
 Nightr 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 H.C.O. 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 se. 
 
 
 
 
 h in s 
 
 o / 
 
 
 
 
 
 
 
 
 
 B' 
 
 + 35 146 
 
 o 42 34 
 
 + 35 39-5 
 
 W + 
 
 8.02 
 
 8.23 
 
 7-93 
 
 8.22 
 
 -9 
 
 - i 
 
 2 
 
 E' 
 
 + 35 145 
 
 o 42 33 
 
 + 35 56-6 
 
 W + 
 
 7.80 
 
 8.03 
 
 7-74 
 
 8.03 
 
 -6 
 
 o 
 
 2 
 
 /' 
 
 + 34 148 
 
 o 50 45 
 
 + 34 40-9 
 
 w 
 
 6.82 
 
 7.26 
 
 6.98 
 
 7-27 
 
 + 16 
 
 + i 
 
 2 
 
 
 Mean. . . 
 
 
 
 
 7-55 
 
 7.84 
 
 7-55 
 
 7.84 
 
 10 
 
 i 
 
 2 
 
 
 
 
 
 TABLE 16. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 1855- 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 O 
 
 
 h m s 
 
 / 
 
 
 O 
 
 
 h m s 
 
 / 
 
 y 
 
 + 34 120 
 
 9-0 
 
 o 41 36 
 
 + 34 38-5 
 
 1 
 
 + 34 131 
 
 9.2 
 
 o 43 22 
 
 + 34 55-7 
 
 z 
 
 + 34 121 
 
 8-4 
 
 0.42 6 
 
 + 34 32-5 
 
 E 
 
 + 34 132 
 
 9-i 
 
 43 24 
 
 + 34 45-7 
 
 a 
 
 + 34 "6 
 
 9-1 
 
 o 42 31 
 
 + 34 45-9 
 
 A 
 
 + 35 i54 
 
 8-9 
 
 o 43 24 
 
 + 35 3-6 
 
 b 
 
 + 34 "7 
 
 8-3 
 
 o 42 46 
 
 + 34 39-0 
 
 
 
 
 
 
 TABLE 17. COMPARISON STARS FOR V ANDROMEDA (IN ORDER OF RIGHT ASCENSION). 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 y 
 
 r 
 u 
 w 
 
 q 
 t 
 
 * 
 
 z 
 s 
 
 k 
 g 
 
 B 
 k 
 E 
 D 
 d 
 
 } 
 a 
 m 
 e 
 b 
 
 
 
 n 
 I 
 A' 
 
 H 
 
 -442 
 -408 
 -388 
 -374 
 -315 
 -286 
 -272 
 -172 
 
 - 75 
 - 68 
 
 - 53 
 
 12 
 
 + 16 
 + "5 
 + 119 
 + 132 
 + 139 
 + 194 
 + 224 
 
 + 235 
 + 258 
 
 + 325 
 + 423 
 + 473 
 + 549 
 + 846 
 + 883 
 
 1 
 -36.0 
 
 -33-3 
 -31.6 
 
 -3 5 
 
 -25-7 
 -23-3 
 
 22.2 
 -I4.I 
 - 6.1 
 
 - 5-5 
 - 4-3 
 i .0 
 
 + 1-3 
 + 9-4 
 + 9-7 
 + 10.8 
 
 + 11- 3 
 + 15.8 
 + 18.3 
 + 19.2 
 
 + 21 .O 
 + 26.5 
 
 + 34-5 
 + 38-5 
 + 44-7 
 + 68.9 
 + 72.0 
 
 H 
 
 -777 
 -275 
 + 342 
 + 206 
 
 -255 
 + 291 
 
 -323 
 -165 
 "56 
 + 396 
 -187 
 -156 
 + 9 
 + 152 
 + 547 
 - 26 
 + 96 
 + 74 
 -748 
 -354 
 -107 
 -185 
 -765 
 + 5i 
 - 15 
 + 296 
 + 714 
 
 4i-5 
 
 9-27 
 
 9-56 
 
 I2 
 
 ii . 29 
 ii .42 
 
 I2 
 II .42 
 
 ii. 5 
 12-5 
 
 
 11.58 
 11.71 
 
 26.1 
 25-1 
 
 ... . 
 
 
 
 
 25-1 
 
 
 
 11.71 
 
 16. o 
 
 23.1 
 
 17-7 
 20.4 
 
 4-7 
 "-5 
 
 "s.'a's 
 
 13.82 
 13-04 
 
 '^52 
 
 14. ii 
 
 '3-33 
 
 12.8 
 
 11.97 
 12.63 
 
 12. 29 
 
 11.68 
 12-34 
 
 12.00 
 
 9 
 
 
 9i 
 o 
 23.0 
 
 3i i 
 37-4 
 20.9 
 26.5 
 44.6 
 23-9 
 
 13-46 
 14. 26 
 11.83 
 10.41 
 9.91 
 12.24 
 ii . 26 
 8.81 
 
 13-75 
 '4-55 
 
 12. 12 
 IO.70 
 IO. 2O 
 
 12-53 
 ii 55 
 9. 10 
 
 
 
 
 
 
 
 
 
 
 
 11.87 
 II .46 
 9.6l 
 
 9 *? 
 
 11.58 
 ii. 17 
 9 32 
 8.98 
 
 41.4 
 43-9 
 
 
 
 
STELLAR PHOTOMETRY. 
 + 30 5 
 
 N 
 
 PLATE 3. 
 -39 s 
 
 'K 
 
 d 
 
 
 
 
 n 
 
 s 
 
 B 
 
 D C 
 
 O 
 
 g* -h 
 
 u 
 
 t 
 
 tr 
 
 + 10' 
 
 +5' 
 
 5' 
 
 Scale, i mm= 7*. 5. 
 
 267 V ANDROMEDA. 
 
 R. A. oh 44 m 39 s. 7 . Dec. 4_ 35 6' 30", 1900, 
 
 '95 
 
CHAPTER III. V ANDROMED/E. 
 
 MAGNITUDE 
 
 33 
 
 30 
 
 -.26 
 
 / 13 
 
 267 V ANDFtOMEDAE. 
 
 IO 
 
 FIG. 7. MAGNITUDE-CURVE FOR V ANDROMEDA. 
 TADLE 18. 267 V ANDROMED/E. PHOTOMETER MEASURES OF COMPARISON STARS. 
 
 1904 October 6. 6-INCH. Fine. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings 
 
 c. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 22 53 
 
 23 14 
 
 o 
 22 
 
 19 
 
 E' 
 B' 
 
 V 
 z 
 b 
 a 
 
 Tl 
 
 F, 
 a 
 b 
 
 z 
 
 y 
 
 B' 
 E' 
 
 13.0 12.3 13.0 
 13.8 14.0 13.7 
 24.9 25.2 25.1 
 16.9 18.1 17.5 
 
 2O. O 21. O 21.3 
 27.4 28.5 28.3 
 
 35-3 35-o 35.7 
 
 12.8 12.8 12. 7 
 12. O 12.2 12.7 
 29.0 28.8 29.8 
 21.7 21.3 22. I 
 
 20. o 19.7 19. i 
 
 25.0 25.1 24.9 
 13.7 14.0 14.0 
 I3.I 13.1 13.2 
 
 12.77 
 13.83 
 25.07 
 i? 50 
 20.77 
 28.07 
 35-33 
 12.77 
 12.30 
 
 29. 20 
 21 .70 
 I9.6O 
 25.00 
 13.90 
 I3-I3 
 
 12.95 
 13-87 
 25-04 
 18.55 
 
 21 . 24 
 28.64 
 
 0.63 
 0.77 
 2.13 
 1.42 
 1.74 
 2.52 
 3.38 
 0.57 
 
 7-77 
 7.91 
 9.27 
 8.56 
 8.88 
 9.66 
 10.52 
 7-71 
 
 8.06 
 
 8.20 
 
 9 56 
 8.85 
 9.17 
 
 9 95 
 10.81 
 8.00 
 
 12-54 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
34 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 18. 267 V ANDROMEDA. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1904 October 30. 6-INCH. Good. 
 
 Sidereal 
 Time . 
 
 Zen. 
 Dist 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 p. 
 
 h m 
 
 21 29 
 
 21 51 
 
 
 
 38 
 34 
 
 ' 
 B' 
 
 y 
 
 s 
 
 b 
 
 a 
 v 
 F' 
 F' al 
 F' m 
 a 
 b 
 
 2 
 If 
 
 E' 
 
 12.8 13.6 13.1 
 15.1 15.2 15.7 
 28.3 28.9 28.3 
 18.4 18.2 19. i 
 
 22.0 23.1 23.2 
 31.2 31.2 30.9 
 
 49-7 49-3 49-4 
 5.5 6.1 6.1 
 14.9 14.1 14.1 
 
 13-7 H-3 H-3 
 32.8 32.9 32.7 
 24.1 23. i 24.2 
 19.7 18.9 19.8 
 28.0 28.2 28.3 
 
 15-7 15-0 i5-i 
 15.0 14.8 14.6 
 
 I3-I7 
 15-33 
 28.50 
 
 18.57 
 22.77 
 31.10 
 49-47 
 5 90 
 H-37 
 14. 10 
 32.80 
 23.80 
 
 19-47 
 28.17 
 
 15-27 
 14.80 
 
 13-99 
 15-30 
 28.34 
 19.02 
 23.29 
 31-95 
 
 o-77 
 0.98 
 
 2-49 
 i-47 
 1.96 
 2.92 
 4.66 
 
 O.O2 
 0.83 
 
 7-7i 
 7.92 
 
 9 43 
 8.41 
 8.90 
 9.86 
 n .60 
 6.96 
 7-77 
 
 8.00 
 
 8.21 
 
 9.72 
 8.70 
 9.19 
 10.15 
 11.89 
 
 7-25 
 8.06 
 
 
 14.24 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 October 30. Quiet, dull. 
 
 23 23 
 23 4' 
 
 20 
 
 18 
 
 b 
 a 
 z 
 
 y 
 
 B' 
 E' 
 E' 
 B' 
 
 y 
 
 z 
 a 
 b 
 F' 
 F' 
 
 25.8 26.7 26.7 
 33-9 34-3 33-9 
 
 19.2 21.2 20.2 
 28.1 27.8 28. I 
 18. I 17.9 17.8 
 15.9 16.0 16.5 
 
 I7.I 16.7 17.1 
 
 18.3 18.1 18.7 
 30.9 30.1 30.0 
 
 21. I 2O. 9 21. 
 
 33-3 32-6 33.3 
 
 25.2 25.0 25.5 
 
 II . I II .0 II . I 
 10.0 10.8 10. i 
 
 26.40 
 
 34-3 
 20. 20 
 28.00 
 
 17-93 
 16. 13 
 16.97 
 18.37 
 30.33 
 
 21 .OO 
 33-07 
 
 25-23 
 II.O7 
 10.30 
 
 25.82 
 
 33-55 
 20.60 
 29.17 
 18.15 
 16.55 
 
 2.23 
 3-13 
 
 1.66 
 2.58 
 i-37 
 1.16 
 
 8.82 
 9-72 
 
 8.25 
 9 '7 
 7.96 
 
 7-75 
 
 9.11 
 
 1O.OI 
 
 8-54 
 9.46 
 8.25 
 8.04 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 10.69 
 
 0.36 
 
 6-95 
 
 7-24 
 
 1904 September ii. 12-INCH. Good. 
 
 21 8 
 21 29 
 
 42 
 
 38 
 
 y 
 
 z 
 
 b 
 a 
 e 
 m 
 d 
 v 
 d 
 m 
 e 
 a 
 b 
 ) 
 z 
 
 y 
 
 17.8 17.6 17. I 
 9-8 97 8.7 
 27.8 27.0 28. i 
 13.1 13.2 14.0 
 24.1 23.8 24.1 
 34-9 35-2 35-8 
 44-1 44-3 44-o 
 
 40.9 40.7 41 .2 
 25.7 25.0 25.5 
 
 37-9 39-2 38-3 
 43-3 44-i 44-4 
 36-1 37-3 36-8 
 23.0 23.1 22.7 
 14.7 14.3 14.7 
 29.2 29.4 29.4 
 8.6 9.7 9.0 
 17. i 16.8 17.4 
 
 I7-50 
 9.40 
 27-63 
 
 '3-43 
 24.00 
 
 35-30 
 44-13 
 40.93 
 25-40 
 38.47 
 43-93 
 36-73 
 22.93 
 
 '4-57 
 29-33 
 9. 10 
 17. 10 
 
 17-30 
 9-25 
 28.48 
 14.00 
 
 23-47 
 36.02 
 44-03 
 39-70 
 
 1.38 
 0.36 
 2.50 
 0.92 
 2.06 
 3-32 
 4.22 
 
 3-75 
 2.24 
 
 9.28 
 8.26 
 10.40 
 8.82 
 9.96 
 
 11.22 
 12. 12 
 11.65 
 
 16. 14 
 
 9-57 
 8-55 
 10.69 
 9.11 
 10.25 
 11.51 
 12.41 
 11.94 
 10-43 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER III. ^V ANDROMEDA. 35 
 
 TABLE 18. 267 V ANDROMEDA PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1904 October 30. 12-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 /( nt 
 
 22 30 
 22 50 
 
 O 
 
 27 
 23 
 
 y 
 
 z 
 b 
 
 f 
 a 
 e 
 m 
 d 
 
 V 
 
 d 
 m 
 e 
 a 
 
 b 
 
 2 
 
 y 
 
 15 8 16.3 16.0 
 7.8 8.1 8.7 
 12.4 13.1 13.1 
 24.8 25.8 24.0 
 20. o 20. o 20. o 
 35-o 35.1 34.8 
 41. 7 42.0 42.0 
 37-8 39.1 39-2 
 33-o 33.9 33.8 
 38-7 38.5 39-2 
 42-3 40-9 4'-9 
 32-2 33.0 32.8 
 22.7 22.3 22.4 
 27.2 26.3 27.3 
 
 12. O 12.8 12.4 
 
 5-9 6.9 7.7 
 14.0 14.6 14.8 
 
 15-03 
 
 8.20 
 
 12.87 
 24.87 
 20.00 
 
 34-97 
 41.90 
 38-70 
 33-57 
 38.80 
 41.70 
 32.67 
 22.47 
 26.93 
 12.40 
 6.83 
 '4-47 
 
 4-75 
 7-52 
 12.64 
 25.90 
 
 21 .24 
 33-82 
 41.80 
 38.75 
 
 I .02 
 O. 21 
 
 0.75 
 2.27 
 1.85 
 3.06 
 3.98 
 3.63 
 3-03 
 
 9.14 
 
 8.33 
 8.87 
 10.39 
 
 9 97 
 11.18 
 
 12. IO 
 
 n-75 
 11.15 
 
 9-43 
 8.62 
 9. 16 
 10.68 
 10.26 
 11.47 
 
 12-39 
 
 12.04 
 11.44 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 November i. Good. 
 
 21 15 
 21 33 
 
 40 
 37 
 
 y 
 
 z 
 b 
 
 f 
 a 
 e 
 d 
 m 
 
 V 
 
 m 
 d 
 e 
 a 
 
 I 
 
 2 
 
 y 
 
 23.1 23.9 23.7 
 16.2 15.9 15.0 
 21.8 21.3 20.7 
 35-i 35.9 34.3 
 30 . 2 29 . 8 29 . 8 
 43.6 44.2 43.9 
 52-3 52-9 52-3 
 55-5 56.7 57-4 
 46.1 45.9 45-0 
 55-0 55-5 55-7 
 50.1 50.1 49.8 
 43-0 43-9 43-i 
 30-7 3-3 30-7 
 36.7 36.0 36.0 
 19.9 19.8 19.8 
 
 15-0 15-5 '5-1 
 25.0 24.4 24.7 
 
 23-57 
 15-70 
 21.27 
 35-io 
 29-93 
 43-90 
 52.5 
 56-53 
 45-67 
 55-40 
 50.00 
 
 43-33 
 30-57 
 36.23 
 19-83 
 15.20 
 24-70 
 
 24.14 
 
 15-45 
 20.55 
 35-67 
 30.25 
 43.62 
 51.25 
 
 55-97 
 
 2. 12 
 I . II 
 
 i-77 
 3-27 
 2.68 
 
 4-17 
 4-93 
 5-29 
 4.40 
 
 9.28 
 8.27 
 8-93 
 '0-43 
 9.84 
 
 i-33 
 12.09 
 
 12.45 
 ii 56 
 
 9-57 
 8.56 
 9.22 
 10.72 
 10. 13 
 ii .62 
 12.38 
 12.74 
 11.85 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 November 2. Fair to good. 
 
 21 57 
 
 32 18 
 
 33 
 29 
 
 y 
 
 z 
 
 b 
 i 
 
 a 
 e 
 m 
 d 
 
 V 
 
 d 
 m 
 e 
 a 
 
 I 
 
 2 
 
 y 
 
 22. O 21.7 21 .7 
 13.8 15.0 14.2 
 19.8 18.3 19.2 
 
 33-7 32-7 34-i 
 27.0 28. i 28.3 
 42.9 41.7 41.8 
 51.4 51.2 51.0 
 46.5 46.3 46.6 
 39.3 40.8 40.2 
 46.5 46.9 46.0 
 50.9 51.2 51.3 
 40.0 41.2 40.0 
 26. i 27.0 26.8 
 32.5 31.8 32.3 
 17.7 18.1 18.6 
 ii .9 12.8 13.0 
 
 21-7 22.2 22.3 
 
 21.80 
 
 14-33 
 19. 10 
 
 33 50 
 27.80 
 
 42.13 
 51.20 
 46.47 
 40. 10 
 46.47 
 
 5i-i3 
 40.40 
 26.63 
 32.20 
 18.13 
 
 12.57 
 22.07 
 
 21.94 
 
 13-45 
 18.62 
 
 32-85 
 27.22 
 41.27 
 
 Si.i? 
 46.47 
 
 1.91 
 o 59 
 1-55 
 2-95 
 2-39 
 3-92 
 4.92 
 4.46 
 3-80 
 
 9-38 
 8.06 
 9.02 
 10.42 
 9.86 
 
 "39 
 12.39 
 
 n-93 
 11.27 
 
 9.67 
 8.35 
 93' 
 10.71 
 10. 15 
 11.68 
 12.68 
 
 12.22 
 11.56 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
36 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 18. 267 V ANDROMEDA PHOTOMETER MEASURES OF COMPARISON STARS.- Continued. 
 
 1902 February 12. 40-INCH. Fair to good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 4 42 
 
 
 
 e 
 m 
 d 
 D 
 B 
 C 
 
 V 
 
 E 
 d 
 tn 
 
 e a 2 
 dat 
 
 17.5 18.0 19.0 
 24.8 25.2 25.0 
 19.2 20. o 19.3 
 38.8 39.7 40.1 
 31.8 32.8 32.0 
 37-i 38.2 37.0 
 30.8 32.3 32.0 
 35-0 35-3 34-8 
 19.5 21.8 20. o 
 
 23.2 24.4 23.7 
 
 16.0 15.9 16. i 
 27.2 28. i 27.2 
 32-8 31.7 33.8 
 
 18.17 
 25.00 
 19 50 
 39 53 
 32.20 
 
 37-43 
 3i-7o 
 35 03 
 20.43 
 
 23-77 
 16.00 
 
 27-50 
 3-77 
 
 17.09 
 24-39 
 19-97 
 
 1-35 
 2.'5 
 i .69 
 
 3-72 
 2.88 
 3-48 
 2.83 
 
 3-20 
 
 ii .42 
 
 12.22 
 11.76 
 13 79 
 12.95 
 '3-55 
 12.90 
 I3-27 
 
 11.71 
 12.51 
 12.05 
 14.08 
 13-24 
 13-84 
 13-19 
 '3-56 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 2.42 
 2.95 
 
 
 
 
 1902 December 26. Clear, unsteady. 
 
 2 45 
 3 25 
 
 
 e 
 m 
 d 
 D 
 B 
 C 
 
 V 
 
 E 
 E 
 C 
 B 
 D 
 d 
 m 
 e 
 Caz 
 
 21.4 22.8 22.5 
 36.4 35.8 35.8 
 
 2 9-9 30-9 31.0 
 58.7 57-2 58.2 
 42.2 43.6 44.6 
 
 52.5 53-3 53-7 
 47-2 45.2 48.2 
 49.9 49.8 49.7 
 49-9 50 8 49.8 
 54-2 53-8 55-8 
 45.8 45.2 45.8 
 54-7 55-7 57-2 
 3i-3 32-8 31.7 
 35-4 36-2 37.0 
 25.0 26.0 25.0 
 39.8 40.7 40.2 
 
 22.23 
 36.00 
 30.60 
 58.03 
 43-47 
 53-17 
 46.87 
 49.80 
 
 50.17 
 54.60 
 45.60 
 55-83 
 31-93 
 36.20 
 
 25-33 
 40.23 
 
 23-78 
 36.10 
 31.27 
 56.93 
 44-54 
 53-89 
 
 2. IO 
 3-32 
 
 2.78 
 
 5-34 
 4.28 
 
 5-15 
 4-50 
 4.80 
 
 11.17 
 
 12,39 
 
 11.85 
 14.41 
 J3-35 
 
 14. 22 
 
 '3-57 
 13-87 
 
 ii .46 
 12.68 
 
 12. 14 
 14.70 
 13.64 
 
 H-5I 
 13.86 
 
 14. 16 
 
 49 99 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3-80 
 
 
 
 
 1905 January 28. Good. 
 
 4 55 
 5 '7 
 
 49 
 
 53 
 
 e 
 m 
 d 
 B 
 D 
 E 
 
 1! 
 
 C 
 C 
 
 v 
 E 
 D 
 B 
 d 
 m 
 e 
 
 18.3 19.8 20. o 
 24.0 24.5 24.4 
 
 21 .9 22.2 22.8 
 
 34-6 33.2 34.2 
 
 44.1 45.1 45.8 
 37.8 38.8 37.3 
 
 35 o 37.0 36.0 
 40 . 2 40 . 8 40 . 7 
 40.1 40.3 39.9 
 37-7 36.0 36.0 
 34-' 34-i 35-2 
 43-9 44-5 45-2 
 34-2 32.0 31.8 
 19.0 18.7 19. i 
 22.5 21.8 21.3 
 
 17.2 17.8 17.5 
 
 19-37 
 24.30 
 22.30 
 34-oo 
 45-00 
 
 37-97 
 36.00 
 
 40.57 
 40. 10 
 
 3 6 -57 
 34-47 
 44-53 
 32-33 
 18.93 
 21.87 
 17-50 
 
 18.44 
 23.08 
 20.62 
 33- 16 
 44.76 
 36.22 
 36.18 
 40.34 
 
 1.50 
 2.O4 
 I. 7 8 
 3.00 
 4-30 
 
 3-33 
 3-33 
 3-8l 
 
 n. 53 
 12.07 
 ii. 81 
 t3 03 
 14.33 
 13-36 
 13-36 
 13-84 
 
 11.82 
 12.36 
 
 12. IO 
 I3.32 
 14.62 
 13.65 
 >3 65 
 
 I4.I3 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER III. V ANDROMEDA. 37 
 
 TABLE 18. 267 V ANDROMEDA. PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1905 January 31. 40-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 4 50 
 
 5 04 
 
 
 
 50 
 
 52 
 
 e 
 m 
 d 
 B 
 D 
 E 
 
 V 
 
 C 
 C 
 v 
 E 
 D 
 B 
 d 
 m 
 e 
 
 26. i 27.2 26.4 
 33-0 33 ' 33-0 
 
 27. 2 28.0 27.7 
 39.8 40. I 40.4 
 52.2 53.7 52.8 
 44.0 44.3 44.0 
 40.8 41.8 41.7 
 44.8 46.9 45.9 
 45.6 44.8 45.0 
 41.7 41.6 41.5 
 42.4 41.4 41.9 
 52.2 52.6 51.5 
 36.0 37.9 36.2 
 23-7 24.3 23.7 
 28.8 27.7 3O.O 
 
 21 .6 21.8 22.7 
 
 26.57 
 33-03 
 27 63 
 40. 10 
 52.90 
 44.10 
 
 4i 43 
 45.87 
 45.13 
 41 .60 
 41.90 
 51. 10 
 36.70 
 23.90 
 28.83 
 22.03 
 
 24.30 
 
 30.93 
 25-76 
 38.40 
 52.00 
 43.00 
 41-52 
 45-50 
 
 2.14 
 
 2-75 
 2.27 
 
 3-59 
 4-99 
 4.11 
 
 3-95 
 4-38 
 
 "55 
 12. 16 
 11.68 
 13.00 
 14-40 
 13-52 
 13-36 
 13-79 
 
 11.84 
 12.45 
 ii 97 
 13.29 
 14.69 
 13.81 
 13-65 
 14.08 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 TABLE 19. 267 V ANDROMEDA. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 1904 
 
 October 6. 
 
 1904 October 30. 
 
 1904 October 30. 
 
 C. 
 
 Obs. 
 
 Mag. 
 
 A Mag. 
 
 C. 
 
 Obs. 
 
 Mag. 
 
 4 Mag. 
 
 C. 
 
 Obs. Mag. 
 
 A Mag. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. P. 
 
 B' 
 
 0.77 
 0.63 
 0.18 
 
 7-91 
 7-77 
 6.96 
 
 8.20 
 
 8.06 
 7-25 
 
 . ii 
 -03 
 
 + .14 
 
 - 03 
 + .03 
 .01 
 
 0.98 
 0.77 
 0.08 
 
 7.92 
 
 7-7 
 7.02 
 
 8.21 
 
 8.00 
 7-31 
 
 -.10 
 
 -.09 
 
 f .20 
 
 .02 
 -03 
 + .06 
 
 1-37 
 1.16 
 0.36 
 
 7.96 
 7-75 
 6-95 
 
 8.25 
 8.04 
 7-24 
 
 .06 -1- .02 
 - .05 +.01 
 
 + .13 - .02 
 
 E' 
 
 F' 
 
 Means . . 
 M. 
 
 0.41 
 
 7-55 
 
 7-14 
 
 7.84 
 7-43 
 
 .09 
 
 i O2 
 
 0.61 
 
 7-55 
 6-94 
 
 7.84 
 7-23 
 
 .13 
 
 .04 
 
 0.96 
 
 7-55 
 6-59 
 
 7.84 
 6.88 
 
 .08 .02 
 
 12-INCH. 
 
 40-INCH. 
 
 . Star. 
 
 Mag. 
 6-inch. 
 
 C. 
 
 Star. 
 
 Mag. 
 1 2-inch. 
 
 C. 
 
 Sept 1 1. 
 
 Octso 
 
 Nov. i. 
 
 Nov. 2. 
 
 Feb. 12. 
 
 Dec. 26- 
 
 Jan. 28. 
 
 Jan. 31. 
 
 
 9-75 
 8.87 
 9.29 
 8.41 
 
 2 
 
 I 
 O 
 
 .06 
 
 92 
 38 
 36 
 
 1.85 
 o.75 
 i .02 
 
 O.2I 
 
 2.68 
 i-77 
 
 2.12 
 I . II 
 
 2.39 
 1.55 
 1.91 
 
 0.59 
 
 d 
 
 
 ii. 
 
 ii . 
 
 12. 
 
 85 
 28 
 26 
 
 1.69 
 1-35 
 2.15 
 
 2.78 
 
 2.10 
 
 3-32 
 
 1.78 
 1-50 
 2.04 
 
 2.27 
 2.14 
 2.75 
 
 g 
 
 e . . 
 
 
 
 m 
 
 Me 
 Me 
 M. 
 
 
 z 
 
 anC . 
 
 Mean C 
 
 
 I 
 9 
 7 
 
 .18 
 .08 
 .90 
 
 0.96 
 9.08 
 8.12 
 
 1.92 
 9.08 
 7.16 
 
 1.61 
 9.08 
 7-47 
 
 
 i-73 
 11.80 
 10.07 
 
 2-73 
 11.80 
 9.07 
 
 1.77 
 ii .80 
 10.03 
 
 2.39 
 1 1. 80 
 9.41 
 
 Mean Mag 
 
 M . 
 
 9.08 
 
 an Mag 
 
 II. 
 
 80 
 
 
 
 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 TABLE 20. 267 V ANDROMEDA. MEAN MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 October 6. 
 
 October 30. 
 
 October 30. 
 
 Mag. 
 
 A Mag. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag.H. 
 
 Mag. P. 
 
 A Mag. 
 
 B'.. 
 E'... 
 F'... 
 
 a. ... 
 6.... 
 y 
 z 
 
 7-91 
 
 7-77 
 6.96 
 
 Mean. 
 
 O.O2 
 
 + 0.03 
 
 O.O2 
 
 7.92 
 
 7-7i 
 7.02 
 
 O.OI 
 
 0.03 
 + 0.04 
 
 7.96 
 
 7-75 
 6-95 
 
 4-0.03 
 4-0.01 
 0.03 
 
 
 
 7-93 
 
 7-74 
 6.98 
 
 8.22 
 
 8.03 
 7-27 
 
 0.02 
 
 0.02 
 0.02 
 
 7-55 
 
 7.84 
 
 O.O2 
 
 9.66 
 
 8.88 
 
 9-27 
 8.56 
 
 Mean. 
 
 0.09 
 
 + O.OI 
 O.O2 
 
 + o. 15 
 
 9.86 
 8.90 
 
 9-43 
 8.41 
 
 + O. II 
 
 4-0.03 
 4-0.14 
 o.oo 
 
 9.72 
 8.82 
 9.17 
 8.25 
 
 0.03 
 0.05 
 
 O. 12 
 
 o. 16 
 
 
 
 
 9-75 
 8.87 
 9.29 
 8.41 
 
 10.04 
 9. 16 
 
 9-58 
 8.70 
 
 0.08 
 0.03 
 0.09 
 O. IO 
 
 9.08 
 
 9 38 
 
 0.08 
 
 
 
 
 i 
 
 
 
 12-INCH. 
 
 Star. 
 
 September 1 1 . 
 
 October 30. 
 
 November i. 
 
 November 2. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 a. ... 
 6.... 
 y 
 
 2. ... 
 
 e. . . . 
 d.... 
 m . . . 
 }.... 
 
 9.96 
 8.82 
 9.28 
 8.26 
 
 Mean. 
 
 II .22 
 
 11.65 
 
 12. 12 
 10.40 
 
 Mean. 
 
 + 0.05 
 0.09 
 
 4-O.OI 
 
 + 0.03 
 
 9 97 
 8.87 
 9.14 
 8-33 
 
 4-0.06 
 0.04 
 -0.13 
 
 + O. IO 
 
 9.84 
 
 8-93 
 9.28 
 8.27 
 
 0.07 
 
 4-O.O2 
 
 4-0.01 
 4-0.04 
 
 9.86 
 9.02 
 9-38 
 8.06 
 
 0.05 
 4-0. ii 
 4-o.n 
 -0.17 
 
 9.91 
 8.91 
 9.27 
 8.23 
 
 IO.2O 
 9. 2O 
 
 9 56 
 
 8.52 
 
 0.06 
 0.06 
 0.06 
 0.08 
 
 9.08 
 
 9-37 
 
 0.06 
 
 0.06 
 
 O.2O 
 
 o. 14 
 
 O.OI 
 
 II. 18 
 11-75 
 
 12. IO 
 10.39 
 
 O. IO 
 O. IO 
 
 o. 16 
 
 O.O2 
 
 "33 
 12.09 
 
 12.45 
 10.43 
 
 4-0.05 
 4-0.24 
 4-0.19 
 
 4-0.02 
 
 "39 
 n-93 
 12-39 
 10.42 
 
 4-o. ii 
 4-0.08 
 4-0.13 
 4-0.01 
 
 11.28 
 11.85 
 12.26 
 10.41 
 
 11-57 
 
 12. 14 
 
 12-55 
 10.70 
 
 0.08 
 0.15 
 0.14 
 0.01 
 
 ii .46 
 
 ii-75 
 
 O. IO 
 
 
 
 
 
 
 
 
 40-INCH. 
 
 Star. 
 
 February 12. 
 
 December 26. 
 
 January 28. 
 
 January 31. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 JMag. 
 
 d 
 
 e 
 m . . . 
 
 B.... 
 C.... 
 D... 
 E.... 
 
 11.76 
 11.42 
 
 12.22 
 
 Mean. 
 
 12.95 
 13-55 
 13-79 
 13.27 
 
 Mean 
 
 o.oo 
 0.04 
 +0.04 
 
 11-85 
 It. 17 
 
 12.39 
 
 4-0.04 
 o. 16 
 
 4-O.I2 
 
 11.81 
 
 Ji-53 
 12.07 
 
 4-0.05 
 4-0.07 
 
 O. II 
 
 11.68 
 "55 
 
 12. id 
 
 -0.08 
 4-0.09 
 
 O.O2 
 
 11.76 
 ii .46 
 12. 18 
 
 12.05 
 iJ-75 
 12-47 
 
 0.06 
 
 O. II 
 
 0.08 
 
 11.80 
 
 12.09 
 
 0.08 
 
 O.II 
 
 0.29 
 -0.49 
 
 O.2I 
 
 13-35 
 
 14 22 
 14.41 
 I3-87 
 
 4-0.09 
 4-0.05 
 0.18 
 4-0.09 
 
 13-03 
 13-84 
 14-33 
 13 36 
 
 0.03 
 o.oo 
 4-0.05 
 
 O.I2 
 
 13.00 
 
 13-79 
 14.40 
 I3-52 
 
 O.O6 
 0.05 
 
 4-o. 12 
 
 4-O.O4 
 
 13.06 
 
 13-84 
 14.28 
 
 I3-48 
 
 13-35 
 H-I3 
 H-57 
 13-77 
 
 0.06 
 0.03 
 
 O. 12 
 0.06 
 
 11.66 
 
 13-95 
 
 0.07 
 
 
 
 
 
 
 
 
 
CHAPTER III. V ANDROMEDA. 
 
 TABLE 21. 267 V ANDROMEDA. VISUAL OBSERVATIONS OP THE VARIABLE. 
 
 No. 
 i 
 
 2 
 3 
 4 
 5 
 6 
 
 8 
 9 
 
 10 
 
 ii 
 
 12 
 
 13 
 H 
 
 15 
 16 
 
 17 
 18 
 
 19 
 
 20 
 
 21 
 22 
 
 23 
 24 
 25 
 26 
 
 27 
 
 28 
 
 29 
 30 
 
 3' 
 
 32 
 33 
 
 34 
 
 35 
 36 
 
 37 
 38 
 
 39 
 40 
 
 42 
 
 Date. 
 
 Ocular. 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 A Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S.T. 
 
 Julian 
 "Day. 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 1897 
 Jan. 19 
 
 21 
 22 
 
 28 
 30 
 
 May 24 
 July 21 
 
 27 
 Aug. 3 
 
 8 
 ii 
 19 
 
 27 
 Sept. 5 
 
 13 
 16 
 
 20 
 
 21 
 
 25 
 29 
 30 
 
 Oct. 14 
 
 25 
 Nov. 16 
 Dec. 29 
 
 1898 
 Jan. 1 6 
 18 
 Feb. 15 
 
 23 
 Mar. 4 
 
 '3 
 16 
 
 23 
 28 
 Apr. 15 
 June 27 
 July 6 
 
 12 
 
 25 
 
 Aug. 9 
 17 
 
 8 
 8 
 7 
 7 
 7 
 15 
 
 10 
 10 
 
 9 
 16 
 
 9 
 9 
 
 9 
 
 7 
 8 
 
 7 
 9 
 
 8 
 
 7 
 
 8 
 
 7 
 16 
 
 7 
 7 
 7 
 7 
 
 7 
 7 
 8 
 
 7 
 7 
 
 7 
 7 
 
 7 
 
 7 
 16 
 
 '3 
 ii 
 
 ii 
 
 12 
 IO 
 II 
 
 2410000+ 
 3944-58 
 3946.58 
 3947 54 
 3953-54 
 3955-54 
 4069 . 88 
 4127.67 
 4I33-67 
 4140.63 
 
 4I45-92 { 
 
 4148.63 
 4156.63 
 
 4164.63 -j 
 
 4I73.54 
 4181.58 
 4184.54 
 
 4186.63 
 
 4188.58 
 
 4189.96 
 4193.58 
 4I97.56 
 4198.94 
 
 4212.54 
 4223.54 
 
 4245.54 
 4288.54 
 
 4306.54 
 4308 . 54 
 4336.58 
 4344-54 
 4353-54 | 
 4362 . 54 
 
 4372.54 
 
 4377-54 
 4395-92 
 4468.89 
 
 4477-71 
 4483-7I 
 
 4496. 85 j 
 
 45"-77 
 45I9-7I 
 
 80 
 40 
 150 
 
 150 
 150 
 150 
 
 40 
 40 
 40 
 150 
 80 
 150 
 150 
 40 
 150 
 150 
 150 
 
 150 
 
 150 
 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 
 150 
 150 
 150 
 150 
 40 
 150 
 150 
 40 
 
 40 
 
 40 
 40 
 80 
 80 
 
 275 
 80 
 
 275 
 460 
 
 '75 
 275 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 
 12 
 12 
 
 12 
 
 12 
 12 
 40 
 12 
 
 12 
 
 /2D, 1)1-26 
 
 29. i, 28.0 
 
 28.5 
 
 ii .00 
 
 moon 
 poor 
 good 
 
 fair 
 fair 
 good 
 good 
 fair 
 
 poor 
 
 good 
 good 
 
 moon 
 moon 
 fair 
 
 o 
 
 2 
 
 3 
 9 
 ii 
 126 
 
 184 
 190 
 197 
 
 202 
 
 205 
 213 
 
 221 
 
 230 
 
 2 3 8 
 240 
 
 -0.33 
 -0.23 
 
 + O. 12 
 + 0.16 
 
 + 0^6 
 + 0.49 
 
 + 0.52 
 
 + 0.50 
 + 0.51 
 
 + 0.40 
 
 + 0.65 
 + 0.32 
 + 0.52 
 
 v not seen 
 
 
 1)30" DO 16 /4D 
 
 26 o 27 o, 27 . i ... 
 
 26.7 
 
 22. I 
 21 . I 
 <2 3 
 
 34-7 
 38.6 
 
 36.9 
 35 9 
 
 35-7 
 34-2 
 
 33-4 
 29.1 
 29. i 
 27.1 
 
 11.25 
 11.79 
 ii .91 
 <n.7 
 
 IO.2I 
 9.69 
 9.91 
 
 IO.O4 
 
 IO.O8 
 10.28 
 
 10.37 
 IO.9T 
 IO.9I 
 II.I8 
 
 62-3D, D2d, vg, vi-2h. . . . 
 vd, vi-2h 
 d glimpsed, D not seen .... 
 
 24.0, 25.0, 20.4, 19.2. 
 23.0, 19.2 
 
 
 71: I. -14. 4. . 
 
 via /2 3D 
 
 38 4 38 9 
 
 l^-yj, DO, D6/ 
 
 *4D 
 
 36.4, 37-4, 37-i 
 -374.. . . ) 
 
 "* , 
 
 O2D, D4/ 
 O2V D5/ 
 
 35-4, 35-1 > 
 
 -1C J. l6 I 
 
 030 D3/ 
 
 
 
 32.4. 34-1 ) 
 
 -1-1 A "7 7 6 . . i 
 
 dIOV, DI-2/ 
 /2V D limit 
 
 27-4, 29.6 
 
 /4~ 5D, 1)26, vdg 
 (&6o aio/ /2e fh 7130 
 
 26.6, 28.5, 26.4 . . 
 
 
 f 
 
 f/5, DI 26, 1>4d, Vlt, VU. . ~| 
 
 j i>3, 7146, 63d, d4O, 03771.. 1 
 j tyu, d$g, g2h, p^q, pi-2r . j 
 Lp2-u limit 4<wi J 
 
 26. i, 28.0, 27.0, ) 
 26.1 
 26 . i 26 . i ) 
 
 26.5 
 
 25-7 
 22.9 
 
 23-' 
 20.7 
 17.1 
 16.1 
 
 ^ I o 
 
 ^ IO 
 
 ^ IQ 
 
 25-5 
 31-2 
 
 31.2 
 
 35-8 
 37-7 
 43-8 
 
 45-0 
 
 46 
 20. 6 
 
 21 .O 
 
 I6. 3 
 
 "3 
 
 4-7 
 
 11.26 
 
 "-35 
 ii .70 
 11.67 
 11.97 
 12.40 
 12.51 
 
 <I2. 3 
 <I2.2 
 
 <I2.2 
 <I2.2 
 
 "37 
 10.67 
 
 10.67 
 
 10.08 
 9.81 
 
 9.00 
 
 8.81 
 8. 7 
 11.98 
 
 "93 
 
 12.49 
 
 <I2. 5 
 
 I3.83 
 
 good 
 good 
 good 
 good 
 good 
 good 
 fine 
 moon 
 
 good 
 good 
 good 
 good 
 
 fair 
 
 good 
 good 
 
 fair 
 
 good 
 poor 
 good 
 poor 
 
 good 
 good 
 
 244 
 
 246 
 250 
 254 
 255 
 IO 
 21 
 
 43 
 86 
 
 104 
 106 
 
 134 
 142 
 
 'Si 
 
 10.) 
 
 163 
 170 
 
 175 
 194 
 
 9 
 
 ii 
 
 24 
 
 37 
 52 
 59 
 
 + 0.45 
 
 + 0.43 
 + 0.67 
 + 0.50 
 + 0.76 
 + 0.69 
 
 + 0.4J 
 
 + 0.03 
 0.24 
 
 + o 16 
 
 0.09 
 -0.25 
 
 0.80 
 
 -0.79 
 -o. 7 
 +0.30 
 0.06 
 
 + 0.31 
 + 0.46 
 
 + 0.53 
 
 23.5, 26.0 
 22.5, 24.0, 21.4 . . 
 23.0, 24.0, 22.4 
 
 22. 0, 2O.4, 19.7 . . 
 16.4, 17.9 
 15-4. 16.9 
 
 6 ID, D3d 
 641), Did, DIJ/ 
 
 63-40, v *di V2 S 
 diD, vg, V2h 
 </4D, TO 3D, i' limit 
 <75D, 77141), limit D 
 v not seen limit 5 <d 
 
 v not seen, limit i2<g. . .. 
 
 
 v not seen limit g and h . . . 
 
 
 v not seen, limit i <J? 
 
 
 D2OT, 712D, /2-3D 
 0561) D271 
 
 22.9, 25.2, 28.6 
 
 33-6, 29.2, 30.9 . . 
 
 31 . Q. 29 . 2 . . . ) 
 
 O5D, D471 
 
 02D, Dioe, D?/, i)6n, nif .... 
 i)Z i , difficult 
 
 32.4, 31-2 i 
 
 35-4, 36.5, 38.1, 33-2 
 36.4, 38.5, 38.4 . . 
 \4l.9, 44-6, 43-81 
 
 44-3. 45-5, 44-4, 45-9 
 
 div, vim, v^A 
 d2i> TJ glimpsed 
 
 22. 0, 19.9, 2O. O . . 
 
 dyv, 041), h2v, v^B, vA .... 
 
 43-41;, -viB 
 BID, D4C, limit C 
 
 D not seen, limit 6<d or 
 
 2<A 
 
 d6B BT,C, Cv, limit D. . . . 
 
 f 18.0, 16.4, 15.7) 
 \i5-5. 16.0 ) 
 
 12.5, 12.5 ) 
 io-5, 8.7 '- 
 '4-5- 9-2 ) 
 <i7, <I5 
 
 
 
 
4 o 
 
 RESEARCHES IN STEUvAR PHOTOMETRY. 
 
 TABLE 21. 267 V ANDROMEDA. VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 t 
 v 
 
 P. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing, 
 
 t. 
 
 A Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 43 
 44 
 45 
 46 
 
 47 
 48 
 
 49 
 50 
 
 5' 
 52 
 
 53 
 54 
 55 
 56 
 57 
 58 
 
 59 
 60 
 61 
 
 62 
 
 63 
 64 
 65 
 66 
 
 67 
 68 
 
 69 
 70 
 
 71 
 72 
 
 73 
 74 
 
 75 
 
 76 
 
 77 
 78 
 79 
 80 
 81 
 82 
 
 83 
 84 
 
 85 
 86 
 
 87 
 88 
 89 
 
 90 
 
 1898 
 Oct. 1 1 
 Nov. 2 
 
 12 
 
 19 
 
 Dec. 3 
 9 
 
 17 
 28 
 
 1899 
 Jan. 2 
 9 
 19 
 28 
 Feb. 7 
 28 
 Mar. 13 
 July 29 
 Aug. 10 
 26 
 Sept. n 
 
 20 
 Oct. 2 
 
 7 
 23 
 30 
 Nov. 4 
 20 
 26 
 Dec. 5 
 
 19 
 
 28 
 
 1900 
 Jan. 2 
 24 
 26 
 
 Feb. 4 
 
 22 
 
 24 
 
 Mar. 7 
 
 21 
 
 May 20 
 June 25 
 July 30 
 Aug. 26 
 Sept. 6 
 
 Oct. 4 
 18 
 23 
 
 1901 
 Feb. 9 
 
 7 
 7 
 8 
 
 7 
 7 
 6 
 
 7 
 6 
 
 6 
 6 
 
 7 
 6 
 
 8 
 8 
 IO 
 
 9 
 9 
 
 8 
 
 8 
 8 
 7 
 7 
 7 
 7 
 7 
 6 
 6 
 
 6 
 
 6 
 7 
 6 
 
 8 
 
 8 
 9 
 
 's 
 
 J4 
 
 IO 
 
 8 
 ii 
 
 7 
 
 IO 
 
 6 
 
 9 
 
 2410000+ 
 
 4574-54 
 4596.54 
 4606 . 58 
 
 4627.54 
 4633-50 
 4641 . 54 
 4652.50 
 
 4657-50 
 4664 . 50 
 
 4674-54 
 4683 . 50 
 
 4693-54 
 4714.62 
 
 4865.67 
 4877-63 
 4893-63 
 4909.58 
 
 4918.58 -J 
 
 4930.58 
 4935-54 
 4951-54 
 4958 . 60 
 4963-50 
 4979-54 
 4985 So 
 4994-52 
 5008.54 
 50I7-50 
 
 5022 . 50 
 5044-54 
 5046 . 50 
 
 5055-58 
 
 5073-58 
 5075-63 
 5086 . 6 ' 
 5100.58 
 5160.83 
 5196.83 
 5231-67 
 5258.58 
 5269.71 
 
 5278-54 
 5297.88 
 53II-67 
 5316.50 
 
 5425.63 
 
 80 
 150 
 ISO 
 150 
 40 
 40 
 40 
 40 
 
 40 
 40 
 40 
 40 
 40 
 150 
 150 
 150 
 40 
 40 
 40 
 150 
 40 
 40 
 40 
 150 
 150 
 ISO 
 150 
 150 
 150 
 200 
 150 
 
 200 
 150 
 
 350 
 
 350 
 
 350 
 '75 
 275 
 
 40 
 40 
 40 
 150 
 237 
 150 
 350 
 237 
 237 
 
 40 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 
 40 
 
 40 
 40 
 
 12 
 12 
 12 
 6 
 6 
 
 6 
 6 
 40 
 6 
 40 
 40 
 40 
 
 6 
 
 v not seen, limit 4<d., . . 
 
 
 23.1 
 27.4 
 30.2 
 
 36.4 
 
 41 .0 
 
 43-1 
 41.1 
 
 41 .6 
 4i-3 
 39-7 
 37-4 
 32-7 
 28.3 
 24.0 
 
 30.7 
 
 34-2 
 38-5 
 40. i 
 
 37-5 
 
 38.6 
 38.6 
 37-9 
 33-2 
 33-3 
 
 29. 2 
 
 25-4 
 24.2 
 2O.9 
 18.4 
 
 18.2 
 7-9 
 
 7-9 
 
 n. i 
 11.4 
 
 21.4 
 31.2 
 42.6 
 39-2 
 
 28.7 
 
 21.2 
 
 18.2 
 " 9 
 
 5.9 
 
 7.4 
 
 41.7 
 
 <I2.2 
 
 II .67 
 
 11.13 
 10.73 
 
 9.98 
 
 9-37 
 9.09 
 
 9-34 
 
 9-30 
 9-32 
 9-54 
 9.86 
 10.47 
 
 II. OI 
 
 "-57 
 10.72 
 10.27 
 9.70 
 9-49 
 9-83 
 
 9-70 
 9.70 
 9.80 
 10.40 
 10.39 
 10.90 
 11.38 
 
 n-53 
 n .96 
 12.25 
 
 12.28 
 
 <I2.2 
 
 '3-49 
 
 13-49 
 
 10.13 
 
 13.05 
 11.88 
 10.67 
 
 9-5 
 9.60 
 10.97 
 ii .90 
 12.28 
 
 <I2.2 
 
 I3-70 
 13-53 
 
 9.27 
 
 fair 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 
 good 
 good 
 good 
 good 
 good 
 good 
 low 
 good 
 good 
 good 
 
 good 
 
 good 
 good 
 good 
 good 
 good 
 fair 
 good 
 good 
 good 
 good 
 
 good 
 good 
 
 fair 
 
 good 
 good 
 fair 
 good 
 fair 
 good 
 good 
 fair 
 good 
 good 
 poor 
 good 
 good 
 
 fair 
 
 114 
 
 136 
 
 146 
 
 153 
 167 
 173 
 
 181 
 192 
 
 197 
 204 
 214 
 223 
 233 
 254 
 9 
 148 
 1 60 
 
 175 
 192 
 
 200 
 
 212 
 217 
 
 233 
 240 
 
 245 
 
 3 
 9 
 
 18 
 
 32 
 41 
 
 46 
 68 
 
 70 
 
 80 
 98 
 
 IOO 
 
 no 
 124 
 185 
 
 221 
 
 256 
 
 24 
 36 
 
 44 
 64 
 
 78 
 82 
 
 192 
 
 + 0.48 
 + 0.36 
 + 0.33 
 + 0.08 
 -0.31 
 0.30 
 
 O.O2 
 
 0. 12 
 
 o. 24 
 
 -0.23 
 + O.O9 
 + O. IO 
 
 o. 18 
 
 0. II 
 
 + 0.04 
 + 0.09 
 
 + O. IO 
 
 +0.13 
 + 0.35 
 
 0.04 
 
 -0.17 
 -0.58 
 
 0.27 
 -0.30 
 
 -0.58 
 
 o. 29 
 
 -0.45 
 -0.48 
 -0.49 
 
 0.62 
 
 + O.O2 
 O.OO 
 
 o.oo 
 
 + O.O2 
 -0.63 
 -I.I4 
 -0.17 
 
 --37 
 o 30 
 -0.27 
 0.30 
 
 -o.i 
 
 + O.2I 
 + 0.05 
 
 -0.08 
 
 vi 2<j vid eyv 
 
 21.9, 24.0, 23.5 . . 
 27.0, 28.5, 26.7 . . 
 27-4, 29.2, 34.1 .. 
 
 v^.d t V2e t no~iv 
 
 dlOV t V271, V$f 
 Q.IV VlE f 
 
 via biv 
 
 
 v^a, biv, viy 
 vy, A '31?, v^a, 641? 
 
 viy, A'$i>, v^a, byv . . . . 
 vy A *2V v^a 641? . . 
 
 42-4, 43-6, 43.6 . . 
 41.5, 40.9, 42.4, 39.6 
 
 42.5, 40.9, 41.4, 41.6 
 41.5, 41.9, 41.4, 40.6 
 39-9, 40.1, 39-5, 39-4 
 37-9, 37-5, 36-4, 38.1 
 32.4, 30.7, 35-i .. 
 30.4, 27.2 27.5 . .. 
 
 A'qv, 64 5V, y2V, V2d. . . 
 A'6v, y^v, aiv, v6-8/.... 
 
 ajv, vn, 1)4-50" 
 Did 
 
 /ID, D3~ 471, D5 
 
 D6/, DIO, 64-50 
 h-2D, via 
 
 DO 
 
 30.1, 30.7, 31.5 
 
 33-4, 35-i 
 37.1, 38.4, 40.1 
 40.9, 39.4 
 174. ) 
 
 ^3 41), DIO 
 
 38 . 4, 37 9 . . . ) 
 
 DIO, /4D, 64-5D 
 
 Z2-3D, D20, &4-5D 
 DO IO 
 
 38.4, 37-4, 40-1 
 38-9, 37-4, 40.1 .- 
 
 O <\V Dd/ D W 
 
 32-4, 35-i, 32-2 
 32-4, 35-i, 32-5 
 27-2, 28.5, 32.0 . . 
 22.5, 27.2, 26.5 . . 
 22.5, 25.0, 25.2 
 
 22. 0, 21 .9, 18.9 . . 
 
 05D, vyn, v(>e 
 vn, V2e, vS-iod 
 e4D, vn, ? D3~4d 
 
 eqV D2d 712D 
 
 dlD, Vim, OI-2D 
 
 TO 2 3D , limit D 
 
 my), d4D, limit i) 
 D not seen, limit 2 < m. . . 
 
 17-4, 19-0 
 
 ( fj 2V 1)40, j 4^ , ^ 5-^-' \ 
 \ 02O, d^ffl, fftoB, />'/'.) 
 
 ( 30, 1)3(7, E2V, v6C. . 1 
 ^ d6m, m8-ioB, B^E ..)- 
 (4-5.0, limit 6-8 <Z>) 
 V2E, vB, miov 
 Bv, V2E, limit E 
 
 71 8.7 .. 
 
 6.1, 7.7, 7.1,10.7. . 
 
 II. i, 11.5, 10.9 . . 
 11.5 ii i 
 
 d2D, Dim 
 OIOD, D/, i'6 8e, viod. .. 
 A 'ID, vy, v6a 
 64 SD, DIO 
 v^d, vim, vf 
 d2D, vig 
 0*51), D6-8B 
 D glimpsed, limit 3 4<d . 
 
 21. 0, 21.9 
 27.4, 31.1, 37.5, 33.0 
 
 42.9, 4i-5, 43-4 
 40.1, 38.4 
 27.0, 28.2, 31.1 
 
 21. 0, 21.4 
 
 18.0, 18.5 
 
 E and D glimpsed 
 
 
 SID, Di(7, 1)4.0 
 B6v, viE, vzC 
 
 vl, D4-50 
 
 8.1, 5.7, 4.0 
 5-5, 10. i, 6.7 
 
 4i-4, 4i-9 
 
CHAPTER III. V ANDROMEDA. 
 
 TABLE 21. 267 V ANDROMEDA. VISUAL OBSERVATIONS OP THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 IH 
 ,3 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 ' 
 
 A Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C.S. T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 92 
 93 
 94 
 95 
 
 96 
 
 97 
 98 
 
 99 
 
 IOO 
 IOI 
 102 
 
 103 
 104 
 
 105 
 106 
 107 
 108 
 109 
 no 
 in 
 
 112 
 
 113 
 114 
 
 5 
 
 1901 
 Nov. i 
 
 1902 
 Feb. 12 
 
 23 
 Oct. 31 
 Dec. 26 
 
 1903 
 Oct. ii 
 
 1904 
 Aug. 29 
 Sept. 1 1 
 Oct. 6 
 Nov. 15 
 29 
 Dec. 5 
 
 1905 
 Jan. 28 
 Feb. 25 
 Mar. 5 
 May 22 
 Aug. 6 
 
 9 
 
 28 
 Sept. 19 
 Oct. I 
 20 
 24 
 
 Dec. 23 
 
 7 
 
 10 
 
 7 
 10 
 
 10 
 
 6 
 
 7 
 
 9 
 7 
 7 
 15 
 15 
 '5 
 9 
 10 
 
 9 
 
 8 
 8 
 
 9 
 10 
 
 2410000+ 
 5689.54 
 
 5793-5 
 5804 
 6054.67 
 6120.6 
 
 6399-54 
 
 6722 
 6735-67 
 6760.67 
 6800 
 6814.50 
 6820.54 
 
 6874.60 
 6902 . 54 
 6910.54 
 6986.88 
 7064.88 
 7067 . 88 
 7086.63 
 7108.67 
 7120.63 
 7I39-58 
 7143-58 
 7150-63 
 7203.69 
 
 80 
 
 237 
 
 237 
 237 
 
 ISO 
 
 67 
 40 
 
 40 
 
 237 
 237 
 67 
 2O 
 
 237 
 150 
 ISO 
 
 237 
 237 
 80 
 
 237 
 237 
 237 
 
 3 
 
 40 
 
 24 
 40 
 40 
 
 6 
 6 
 
 12 
 
 6 
 
 24 
 6 
 
 12 
 
 40 
 40 
 12 
 
 5 
 40 
 6 
 6 
 40 
 40 
 
 12 
 4 
 40 
 40 
 
 A'm, Tib 
 va-iB 
 
 42-9, 44-6 
 
 43-7 
 
 12. O 
 6. 9 
 
 6-9 
 
 8.1 
 
 28.9 
 33-6 
 
 9.00 
 
 13.00 
 i3-6 
 13.60 
 '3-45 
 
 10.96 
 
 JO. 35 
 io. 14 
 10.52 
 12.3 
 
 <I2.2 
 
 12. 5 
 
 13-34 
 11.79 
 II .60 
 9.27 
 
 ".75 
 II.80 
 12.03 
 13.35 
 13 40 
 
 <I3-0 
 12.92 
 12.78 
 10.9 
 
 fair 
 good 
 
 good 
 
 fair 
 good 
 fine 
 
 197 
 
 43 
 
 54 
 47 
 
 112 
 
 133 
 
 198 
 
 212 
 
 237 
 
 0.42 
 
 + 0.19 
 
 + 0-43 
 + 0.67 
 + 1-03 
 
 0.40 
 
 + 0.93 
 + 0.41 
 
 O.O2 
 
 photograph, E$v, v^C . . . 
 Em, -viC 
 Eyv, Em, v$C 
 
 5-i, 8-7 
 8.1, 5-7 
 
 8 5 8 I 77 
 
 "vjd, 1*46, nm 
 
 30.0, 30.5, 26.2. 
 
 
 photometer 
 
 
 photometer 
 
 
 
 photographs 
 
 
 
 v not seen, limit 34 < d . 
 
 
 ^5.9 
 
 fair 
 good 
 
 good 
 good 
 good 
 fair 
 good 
 fair 
 fair 
 fair 
 fair 
 good 
 good 
 good 
 fair 
 
 32 
 
 38 
 
 92 
 1 2O 
 128 
 204 
 
 24 
 
 37 
 46 
 68 
 80 
 
 103 
 no 
 163 
 
 O. 12 
 
 + 0.04 
 O.2O 
 O.O7 
 
 -0-33 
 -0.45 
 -0.87 
 0.90 
 -0.13 
 -0.05 
 0.07 
 + 0.07 
 + 0.26 
 + 0.9 
 
 11 glimpsed, m$'v 
 
 
 photometer 
 
 
 dyv, vyn 
 AITJ eiv 112m . 
 
 20.0, 23.9 
 23-0, 25.5, 22.9. 
 40.6, 43.4 
 22. 0, 22.9 
 20.5, 23.4 
 18.5, 20.9 
 
 7.5, io. i, 7.7 .. 
 '0-5, 9-i, 5-7 - 
 
 22. 
 23-8 
 41.8 
 22-4 
 22. 
 2O. I 
 8. 9 
 
 8-4 
 
 12.7 
 '3 9 
 29 
 
 dm, vim 
 
 ^4-51;, vm 
 Bqv, mE, VT,C 
 Bm, T>E, viC 
 v not seen, limit B 
 
 vi 2B, Tj^C,v5E, m6-8v. 
 
 13-0, 9.7,14.1,13.8 
 14.0, 10.7, 12.8 
 
 30.0, 26.4 
 
 v6-8d, 010-121; 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 22. 267 V ANDROMEDA. MEAN MAGNITUDES PROM 21.5 DAY GROUPS. 
 
 Grou] 
 r D 
 
 > No 
 
 i 
 
 21 -5 
 
 2 
 4.1 
 
 3 
 64. S 
 
 4 
 86 
 
 5 
 107.5 
 
 6 
 
 129 
 
 7 
 150.5 
 
 8 
 172 
 
 9 
 193.5 
 
 IO 
 
 215 
 
 ii 
 236.5 
 
 12 
 
 258 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r t 
 
 6 
 
 
 
 
 
 
 
 
 187 
 
 204 
 
 226 
 
 247 
 
 
 M 
 
 
 
 
 
 
 
 
 
 9-95 
 
 IO.O8 
 
 10.64 
 
 II .43 
 
 3944 < 
 
 AM 
 
 
 
 
 
 
 
 
 
 + 0.62 
 
 + 0.50 
 
 + O. t-2 
 
 + 0.52 
 
 
 No 
 
 
 
 
 
 
 
 
 
 2 
 
 4 
 
 2 
 
 7 
 
 
 r / 
 
 16 
 
 
 
 
 
 
 138 
 
 161 
 
 175 
 
 194 
 
 
 
 
 M 
 
 
 
 
 
 
 
 ii .02 
 
 9.89 
 
 8.81 
 
 8.7 
 
 
 
 4202 < 
 
 JM 
 
 4-O "\5 
 
 
 
 
 
 
 O. IO 
 
 o. 24 
 
 0.79 
 
 o.7 
 
 
 
 
 No 
 
 2 
 
 
 
 
 
 
 2 
 
 4 
 
 i 
 
 i 
 
 
 
 
 r t 
 
 14 
 
 30 
 
 59 
 
 
 
 
 14! 
 
 160 
 
 182 
 
 205 
 
 228 
 
 254 
 
 
 M 
 
 1 1 06 
 
 12 78 
 
 il 81 
 
 
 
 
 1 1 4O 
 
 10.38 
 
 9.27 
 
 9.39 
 
 10. 16 
 
 ii .01 
 
 4460 < 
 
 JA/ 
 
 -f-O 12 
 
 + o 18 
 
 + o 53 
 
 
 
 
 + O.42 
 
 + o. 20 
 
 0.21 
 
 O.20 
 
 + 0.10 
 
 -0.18 
 
 
 No 
 
 2 
 
 2 
 
 i 
 
 
 
 
 2 
 
 2 
 
 3 
 
 3 
 
 2 
 
 i 
 
 
 < 
 
 Q 
 
 
 
 
 
 
 148 
 
 1 60 
 
 184 
 
 206 
 
 225 
 
 242 
 
 
 M 
 
 II C7 
 
 
 
 
 
 
 10.72 
 
 IO.27 
 
 9.60 
 
 9.76 
 
 9-75 
 
 10.50 
 
 4718 < 
 
 AM 
 
 O II 
 
 
 
 
 
 
 + O.O4 
 
 + O.O9 
 
 + O. 12 
 
 + 0.16 
 
 -0.38 
 
 -0.28 
 
 
 (_ No 
 
 I 
 
 
 
 
 
 
 j 
 
 I 
 
 2 
 
 2 
 
 2 
 
 2 
 
 4976 < 
 
 r J 
 
 JM 
 . No. 
 
 !< 
 
 IO 
 11.27 
 -0.44 
 3 
 
 36 
 
 12. IO 
 0.48 
 
 2 
 
 4 6 
 12.28 
 0.62 
 
 i 
 
 64. 
 
 75 
 13-49 
 
 + O.OI 
 
 3 
 go 
 
 99 
 13.08 
 
 + 0.01 
 2 
 
 "7 
 11.28 
 -0.88 
 
 2 
 
 
 
 185 
 9-15 
 -0.17 
 
 I 
 
 1 02 
 
 
 221 
 9.60 
 
 -0-37 
 I 
 
 256 
 
 10.97 
 -0.30 
 I 
 
 
 M 
 
 
 
 ! 14- 
 
 
 
 
 
 
 Q.27 
 
 
 
 
 5234 " 
 
 4M 
 
 
 o 28 
 
 
 
 
 
 
 
 O.O8 
 
 
 
 
 
 No 
 
 
 2 
 
 I 
 
 2 
 
 
 
 
 
 I 
 
 
 
 
 
 [/ 
 
 
 
 
 
 
 
 
 
 
 197 
 
 
 
 
 M 
 
 
 
 
 
 
 
 
 
 
 9.OO 
 
 
 
 
 AM 
 
 
 
 
 
 
 
 
 
 
 0.42 
 
 
 
 
 No 
 
 
 
 
 
 
 
 
 
 
 I 
 
 
 
 
 < 
 
 
 
 4 8 
 
 
 
 
 
 
 
 
 
 
 
 M 
 
 
 
 it 14- 
 
 
 
 
 
 
 
 
 
 
 575 ' 
 
 JA/ 
 
 
 
 -j-o 31 
 
 
 
 
 
 
 
 
 
 
 
 No. 
 
 
 
 2 
 
 
 
 
 
 
 
 
 
 
 
 / 
 
 
 
 
 
 
 H2 
 
 
 
 
 
 
 
 
 M 
 
 
 
 1 1 60 
 
 
 
 I 3 d.^ 
 
 
 
 
 
 
 
 
 AM 
 
 
 
 + o 67 
 
 
 
 4. I 03 
 
 
 
 
 
 
 
 
 No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 !t 
 
 
 
 
 
 
 
 IH 
 
 
 
 
 
 
 
 M 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 JA/ 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 No. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 [< 
 
 
 
 
 
 
 
 
 
 
 2O5 
 
 
 237 
 
 
 M 
 
 
 
 
 
 
 
 
 
 
 IO.24 
 
 
 IO.52 
 
 6524 ' 
 
 AM 
 
 
 
 
 
 
 
 
 
 
 +0.67 
 
 
 O.O2 
 
 
 No. 
 
 
 
 
 
 
 
 
 
 
 2 
 
 
 I 
 
 
 !< 
 
 
 18 
 
 
 
 
 
 
 
 
 
 
 
 
 M 
 
 
 12 S 
 
 
 
 
 
 
 
 
 
 
 
 
 AM 
 
 
 O. 12 
 
 
 + o 04 
 
 
 o 20 
 
 
 
 
 
 
 
 
 No. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Means 
 
 f 
 
 ] AM 
 I No. 
 
 II 
 
 u-75 
 
 + O.OI 
 12 
 
 32 
 12.37 
 -0.13 
 
 7 
 
 53 
 13.26 
 +0.16 
 6 
 
 82 
 13.48 
 + 0.06 
 
 6 
 
 99 
 13.08 
 
 + O.OI 
 2 
 
 116 
 12.17 
 
 O.O2 
 
 4 
 
 140 
 11.02 
 O.OI 
 
 6 
 
 160 
 10.18 
 
 + O.O2 
 
 7 
 
 184 
 
 9-34 
 0.08 
 IO 
 
 2O2 
 
 9-53 
 + 0.03 
 
 13 
 
 225 
 10.04 
 0.03 
 
 7 
 
 245 
 10.89 
 0.05 
 12 
 
CHAPTER HI V ANDROMEDA. 
 
 43 
 
 SI 
 
 
 m 
 
 e 
 a\ 
 to 
 
 xio 
 
 | - 
 
 Uj 
 
 ^. 2 g 
 
 FIG. 8. LIGHT-CURVE OF V ANDROMKD*. 
 
44 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 23. 267 V ANDROMEDJB. OBSERVED MAXIMA AND MINIMA. 
 Elements of maximum. 1897 July 26 (J. D. 2414132H259 1 (E-i). M-m=lll d . 
 
 MAXIMA. 
 
 MINIMA. 
 
 . 
 
 Date. 
 
 Mag. 
 
 
 
 
 
 Date. 
 
 Mag. 
 
 
 
 O 
 
 
 
 Corr 
 
 Wt 
 
 ^3 
 
 
 
 Corr. 
 
 Wt. 
 
 K 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 
 
 W 
 
 Calendar. 
 
 J.D. 
 
 H. 
 
 P. 
 
 
 
 I 
 
 1897 July 26 
 
 4132 
 
 97 
 
 IO.O 
 
 
 
 10 
 
 i 
 
 1897 Apr. 10 
 
 4025 
 
 
 me 
 
 + 4 
 
 3 
 
 2 
 
 1898 Apr. 15 
 
 4395 
 
 8 70 
 
 8.99 
 
 + 4 
 
 12 
 
 2 
 
 Dec. 8 
 
 4267 
 
 
 me 
 
 -13 
 
 4 
 
 3 
 
 Dec. 20 
 
 4644 
 
 9. 10 
 
 9-39 
 
 - 6 
 
 2O 
 
 3 
 
 1898 Sept. i 
 
 4534 
 
 13.90 
 
 14.19 
 
 - 5 
 
 10 
 
 4 
 
 1899 Sept. 20 
 
 4918 
 
 9.40 
 
 9.69 
 
 + 9 
 
 17 
 
 4 
 
 1899 May to 
 
 475 
 
 
 me 
 
 -13 
 
 2 
 
 5 
 
 1900 May 17 
 
 5157 
 
 8.9 
 
 9.2 
 
 ii 
 
 8 
 
 5 
 
 1900 Feb. 5 
 
 5056 
 
 13.4 
 
 13.69 
 
 i 
 
 21 
 
 6 
 
 1901 Feb. 6 
 
 5422 
 
 9-3 
 
 9.6 
 
 5 
 
 I 
 
 6 
 
 Oct. 24 
 
 S3 1 ? 
 
 13-67 
 
 I3-96 
 
 + i 
 
 5 
 
 7 
 
 Oct. 22 
 
 5680 
 
 9.0 
 
 9-3 
 
 - 6 
 
 I 
 
 7 
 
 1901 June 24 
 
 5560 
 
 
 me 
 
 -"5 
 
 i 
 
 10 
 
 1903 Dec. i 
 
 6450 
 
 
 me 
 
 -'3 
 
 i 
 
 8 
 
 1902 Mar. 9 
 
 , S 8i8 
 
 13.6 
 
 13-9 
 
 -16 
 
 2 
 
 ii 
 
 1904 Sept. 9 
 
 6733 
 
 10. 10 
 
 10.39 
 
 + n 
 
 6 
 
 9 
 
 Dec. 4 
 
 6088 
 
 14.0 
 
 14-3 
 
 - 5 
 
 3 
 
 12 
 
 1905 May 5 
 
 6971 
 
 9.06 
 
 9-35 
 
 10 
 
 4 
 
 12 
 
 1905 Jan. ii 
 
 6857 
 
 13-32 
 
 13.61 
 
 - J 3 
 
 4 
 
 
 DAYS 
 /0<? 
 
 Z(?^> 
 
 300 
 
 
 
 
 | I 1 
 
 
 
 
 
 
 
 
 
 167 
 
 / AND 
 
 Min. 
 M-m- 
 
 ffOM 
 
 = 7* 
 . /// 
 
 1 1 1 
 
 
 
 
 
 
 
 
 
 
 f 5 
 
 
 
 -1 X 
 
 
 
 
 
 
 
 
 
 
 
 <y 
 
 f 
 
 
 
 
 
 
 
 
 
 
 \ 
 
 
 
 r 
 
 
 
 
 j j 
 
 
 3 -i 
 
 
 IQ 
 
 
 .i 
 
 
 
 
 
 \ 
 
 
 
 ? 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 I 
 
 
 
 
 
 
 2" 
 
 
 r 
 
 
 
 
 
 
 
 
 
 _ r 
 
 
 i 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 \ 
 
 
 
 
 
 
 
 
 r 
 
 
 
 j 
 
 
 
 
 
 
 - -J - 
 
 
 T 
 
 
 
 
 
 
 
 
 
 7 
 
 
 
 
 
 r 
 
 
 
 
 
 
 r : 
 
 
 
 
 w " . 
 
 jA 
 
 
 
 
 
 
 
 
 __[ 
 
 
 Q 
 
 ^ 
 
 
 
 
 
 
 
 
 V 
 
 
 
 
 
 
 
 
 
 7 
 
 
 
 
 
 
 
 
 
 
 
 r 
 
 
 
 i 
 
 
 
 
 
 
 
 
 
 
 
 J 
 
 z 
 
 
 
 
 
 
 
 
 
 
 
 o 
 
 
 
 
 
 
 
 n 
 
 
 
 
 
 
 r 
 
 
 
 
 
 
 
 
 I 
 
 2 
 
 
 s 
 
 
 
 
 
 f 
 
 
 
 
 
 . 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 , 
 
 
 
 
 
 
 
 
 1 
 
 
 
 ] 
 
 
 
 T 
 
 
 
 
 
 ':: 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 \ 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1 
 
 
 
 
 i 
 
 
 
 
 
 
 
 7 
 
 
 
 
 
 
 
 
 \ 
 
 
 
 r 
 
 
 
 
 
 M 
 
 
 
 * 
 
 
 
 
 
 
 
 'J 
 
 
 
 
 
 
 
 t. 
 
 
 
 
 
 
 
 
 \ 
 
 
 4 v 
 
 
 
 
 
 
 
 
 
 
 x , ; 
 
 
 
 
 
 
 
 
 
 ^ 
 
 7 
 
 
 
 
 
 
 
 
 
 
 7 
 
 > 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 /4 .- 
 
 
 
 
 
 
 
 
 
 
 
 FIG. 9. MEAN LIGHT-CURVE OF V ANDROMEDA. 
 
 See Table 22, page .42. 
 
CHAPTER IV. 
 
 787 W ANDROMEDA. 
 R. A. 2 h 11> 14M; Dec. +43 50' 26" (1900). 
 
 This is another of Anderson's discoveries, announced in the Nachrichten under 
 date January 8, 1898. Observations began at once with the star on the descending 
 branch of the light-curve. The first minimum was below the limit of the 6-inch, 
 but the following maximum was well covered and the second minimum was ob- 
 served with the 12- and 4O-inch telescopes, then followed occasional observa- 
 tions, frequent enough to fix the number of the epoch, till the minimum and 
 maximum of 1904 and 1905, for which more numerous observations were made. 
 Comparing with the earlier dates the period 396 days was found and the mean 
 light-curve deduced, using comparisons up to February 25, 1905. The subsequent 
 maximum, 1905 May 31, indicates a slightly longer period, perhaps 397 days. 
 
 The characteristic features of the light-curve are : first, a large range, from 
 about 7th to fainter than i3th magnitude; second, a steady variation, unbroken 
 by secondary curves, therefore the normal points from Table 31 lie close to the 
 mean light-curve. 
 
 The comparison star c has been suspected of variability by Hagen (A. N. 164, 
 79), and confirmatory observations are given by Williams (A. N. 164. 370- Pro- 
 visional magnitudes were published by the writer in A. J. 24, 25. To give an 
 idea of the possible variation, these are summarized below, Williams' observations 
 being reduced to magnitudes by assuming his star a (my 6) to be 9.53, and his 
 star b (my /) to be 9.57. 
 
 Hagen. 
 
 Williams. 
 
 Parkhurst. 
 
 Date. 
 
 Mag. 
 
 Date. 
 
 Mag. 
 
 Date. 
 
 Mag. 
 
 1900 Nov. 12 
 
 99 
 
 1900 Dec. 13 
 
 9-55 
 
 1899 Feb. 6 
 
 9-5 
 
 1901 Feb. 6 
 
 9.2 
 
 21 
 
 9.70 
 
 Oct. 1 8 
 
 9-5 
 
 10 
 
 9.2 
 
 1901 Jan. 14 
 
 9.60 
 
 23 
 
 9-4 
 
 Oct. 15 
 
 9.2 
 
 Feb. 13 
 
 9.38 
 
 28 
 
 9-3 
 
 Nov. 21 
 
 9.2 
 
 15 
 
 9.42 
 
 Nov. 4 
 
 9.2 
 
 1902 Oct. 8 
 
 8.9 
 
 1902 Jan. 31 
 
 9.68 
 
 1900 Feb. 1 6 
 
 9.6 
 
 1903 Sept. 22 
 
 8.8 
 
 Dec. 29 
 
 9,62 
 
 1902 Feb. 4 
 
 9-27 
 
 24 
 
 8.8 
 
 3' 
 
 9.70 
 
 Mar. 4 
 
 9.14 
 
 Oct. 20 
 
 8.8 
 
 
 
 27 
 
 9.20 
 
 Nov. 1 8 
 
 8.9 
 
 
 
 Oct. 29 
 
 9 '3 
 
 
 
 
 
 1903 Nov. 17 
 
 9.24 
 
 
 
 
 
 18 
 
 9-3 
 
 
 
 
 
 19 
 
 9.26 
 
 
 
 
 
 Dec. 6 
 
 9-23 
 
 
 
 
 
 21 
 
 9.40 
 
 
 
 
 
 Nov. ii 
 
 9-15 
 
 
 
 
 
 1904 Oct. 30 
 
 9.19 
 
 45 
 
4 6 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 With one exception, the range in either series does not exceed 0.4 magni- 
 tude, a rather slender basis to prove variability, thus throwing the burden of 
 proof on the first observation in Hagen's series. But this is not confirmed by 
 the nearly simultaneous observations by Williams, so that the matter is left in 
 doubt. An idea of the color of the stars can be obtained from the following 
 summary of visual and photographic results. The visual magnitudes are photo- 
 metric, the photographic are from a Seed 27 plate and a Cramer isochromatic 
 plate. 
 
 Star. 
 
 Vis. 
 
 Seed. 
 
 ISO. 
 
 a 
 
 9-i5 
 
 9. 12 
 
 9-13 
 
 
 
 8-93 
 
 8-95 
 
 8.95 
 
 b 
 
 9-53 
 
 9-53 
 
 9-53 
 
 g, 
 
 11.05 
 
 11.05 
 
 11.05 
 
 i 
 
 10. 12 
 
 9.58 
 
 9.70 
 
 c 
 
 9.28 
 
 9.80 
 
 9.66 
 
 The stars a, o, b, and g, with their visual magnitudes, were used as standards 
 from which to obtain the photographic magnitudes of / and c. It will be noticed 
 that the star c is shown to be yellow as its photographic magnitude is 0.4 to 0.5 
 fainter than the visual, while the star / is blue, photographing 0.4 or 0.5 brighter 
 than the visual magnitude. This is confirmed by the visual observations of Hagen 
 and the writer, compared with the photographic results of Williams. 
 
 TABLE 24. W ANDROMEDA. STANDARD MAGNITUDE STARS. 
 
 
 
 1900. 
 
 
 Magnitude. 
 
 Residuals. 
 
 Star. 
 
 B. D. No. 
 
 R A 
 
 
 Color 
 P. DM. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nights 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 H.C.O- 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 se. 
 
 
 3 
 
 h m s 
 
 e i 
 
 
 
 
 
 
 
 
 
 D 
 
 E 
 
 + 42 480 
 + 42 506 
 
 2 O9 48 
 
 2 16 31 
 
 + 42 13-9 
 
 + 43 03.6 
 
 GW- 
 GW- 
 
 7.61 
 
 7-44 
 
 8.14 
 7.92 
 
 7-73 
 7-44 
 
 8.14 
 7-85 
 
 + 12 
 
 
 o 
 
 -7 
 
 7 
 
 2 
 
 r 
 
 + 43 474 
 
 2 15 H 
 
 + 44 08.5 
 
 GW 
 
 6.96 
 
 7.20 
 
 6.85 
 
 7.26 
 
 II 
 
 + 6 
 
 9 
 
 
 Means .... 
 
 
 
 
 7-34 
 
 7-75 
 
 7-34 
 
 7-75 
 
 8 
 
 4 
 
 6 
 
 
 
 
 
 TABLE 25. COMPARISON STARS IN B. D. CATALOGUE. 
 
 ^tar 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 1855. 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 
 
 
 h m s 
 
 / 
 
 
 
 
 
 h m 
 
 / 
 
 a 
 
 
 
 b 
 c 
 
 + 43 457 
 + 43 46o 
 + 43 461 
 + 43 462 
 
 8.9 
 9.0 
 9-5 
 9-5 
 
 2 7 18 
 2 7 Si 
 
 2 8 21 
 
 2 8 37 
 
 + 43 45-6 
 + 43 54-3 
 + 43 41.6 
 
 + 43 37-5 
 
 r 
 P 
 1 
 
 + 43 474 
 + 43 478 
 + 43 482 
 
 6.5 
 8.0 
 
 8.2 
 
 2 12 24 
 
 2 12 53 
 
 2 14 II 
 
 + 43 56.o 
 + 43 36.6 
 + 43 43-1 
 
STELLAR PHOTOMETRY. 
 
 N 
 
 ora 
 
 
 
 a 
 
 b< 
 
 r. 
 
 u 
 
 . 
 * 
 
 + 20' 
 
 -+ 10' 
 
 10 
 
 -Spqle, i 
 
 1902 January 12 
 
 R. A. 
 
 787 W ANDROMED^E. 
 
 " * 
 
 m i 4 s.i. Dec. +43 50' 26", 1900 
 
CHAPTER IV. W ANDROMEDA. 
 
 47 
 
 TABLE 26. COMPARISON STARS FOR W ANDROMEDA (IN ORDER OP RIGHT ASCENSION). 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 
 H 
 
 s 
 
 It 
 
 
 
 
 
 
 a 
 
 -721 
 
 - 66.6 
 
 + 468 
 
 37-8 
 
 9 15 
 
 9-56 
 
 
 
 
 
 n 
 
 -421 
 
 - 38-9 
 
 - 131 
 
 21.8 
 
 
 
 ii .09 
 
 11.50 
 
 d 
 
 -387 
 
 - 35-8 
 
 - 15 
 
 25.8 
 
 
 
 10.61 
 
 II .02 
 
 
 
 - 3 66 
 
 - 33-8 
 
 + 1007 
 
 42.0 
 
 8-93 
 
 9-34 
 
 
 
 
 
 I 
 
 ^41 
 
 31 .5 
 
 238 
 
 
 
 
 
 
 m 
 
 Of 
 
 -330 
 
 - 3i-4 
 
 + 39 
 
 19.9 
 
 . . . . , 
 
 
 
 I I . 21 
 
 II .62 
 
 k 
 
 Tl6 
 
 29. 2 
 
 2^S 
 
 
 
 
 
 
 h 
 
 o * w 
 
 -173 
 
 16.0 
 
 OJ 
 - 229 
 
 15 9 
 
 
 
 11.80 
 
 12.21 
 
 y 
 
 -117 
 
 - 10.8 
 
 - 44 
 
 2.5 
 
 13.61 
 
 14.02 
 
 
 
 x 
 
 n6 
 
 10. 7 
 
 26 
 
 
 
 
 
 
 w 
 
 - 7i 
 
 - 6.6 
 
 - 3i 
 
 
 12.95 
 
 13-36 
 
 
 ..... 
 
 ft 
 
 - 63 
 
 - 5-8 
 
 + 22 
 
 
 14.2 
 
 14.6 
 
 
 
 a 
 
 - 60 
 
 - 5-5 
 
 8 
 
 o 
 
 
 
 
 13.58 
 
 13 99 
 
 6 
 
 - 5i 
 
 - 4-7 
 
 + 206 
 
 34-4 
 
 9-53 
 
 9-94 
 
 
 
 
 
 Y 
 
 - 3i 
 
 - 2.9 
 
 + '3 
 
 
 14-55 
 
 14.96 
 
 
 
 U 
 
 - 9 
 
 - o.g 
 
 129 
 
 '9-8 
 
 12.42 
 
 12.83 
 
 
 
 Z 
 
 + 59 
 
 + 5-5 
 
 - 84 
 
 i-5 
 
 13-34 
 
 '3-75 
 
 
 
 
 c 
 
 + 130 
 
 + 12. 
 
 + 9 
 
 34-7 
 
 9.28 
 
 9.69 
 
 
 
 g 
 
 + 183 
 
 + 16.9 
 
 - 188 
 
 2O. 2 
 
 11.05 
 
 11.46 
 
 
 
 
 
 / 
 
 + 402 
 
 + 37-1 
 
 - 43 
 
 29-3 
 
 IO. 12 
 
 10.53 
 
 
 
 
 r 
 
 
 + 240 
 
 + 1140 
 
 54-2 
 
 6.85 
 
 7.26 
 
 
 
 
 P 
 
 
 + 269 
 
 - 70 
 
 46-5 
 
 7-89 
 
 8.30 
 
 
 
 9 
 
 
 + 346 
 
 + 320 
 
 48-5 
 
 7.67 
 
 8.08 
 
 
 
 
 
 TABLE 27. 787 W ANDROMED/B. PHOTOMETER MEASURES OP COMPARISON STARS. 
 
 1903 December 6. 6-INCH. Good; moon rising at end. 
 
 Sidereal 
 Time. 1 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 "h m 
 23 23 
 
 23 52 
 
 O 
 
 30 
 3' 
 
 26 
 
 D 
 E 
 
 rai 
 
 1 
 
 P 
 
 c 
 b 
 a 
 
 
 
 o 
 a 
 b 
 c 
 r a i 
 E 
 D 
 
 13.8 14.1 14.1 
 
 12.3 12.0 12.2 
 
 14.0 13.2 13.7 
 14.4 13.9 14.2 
 15.2 15-3 15-8 
 25.1 26.0 25.9 
 27.2 27.8 27.7 
 24.2 25.7 25.8 
 25.0 25.8 25.6 
 25.3 24.3 25.5 
 26.2 26. I 25.5 
 29.0 28.8 29.8 
 27.9 28.7 28.0 
 14.0 14.4 13.7 
 
 12.2 12.4 II.9 
 
 14.3 14.1 14 o 
 
 14.00 
 12.17 
 
 13-63 
 14.17 
 IS 43 
 25-67 
 27-57 
 25-23 
 25.47 
 25-03 
 25-93 
 29.20 
 28.20 
 14-03 
 12.17 
 
 14-13 
 
 14.07 
 12.17 
 
 13-83 
 
 0.81 
 0.52 
 0.76 
 0.82 
 i .00 
 
 2-34 
 2.50 
 
 2. 2O 
 2.16 
 
 7.70 
 7.41 
 7-6 5 
 7-7i 
 7.89 
 
 9-23 
 9 39 
 9.09 
 
 9-05 
 
 8. ii 
 
 7.82 
 8.06 
 
 8.12 
 
 8.30 
 9.64 
 9.80 
 9 50 
 9.46 
 
 
 26.94 
 28.39 
 25-58 
 25-25 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
48 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 27. 787 W ANDROMEDA. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1903 December 21. 6-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings- 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6- 
 
 H. 
 
 P. 
 
 h m 
 o 38 
 
 i 18 
 
 O 
 
 15 
 13 
 
 10 
 
 D 
 E 
 
 q 
 
 p 
 
 r a i 
 f 
 c 
 
 V 
 
 b 
 a 
 
 
 
 
 a 
 b 
 c 
 r a r 
 P 
 
 i 
 D 
 
 12.3 12.3 it. 8 
 9.8 10.4 10.0 
 12.7 13.2 13.6 
 15.3 14.8 14.4 
 ii .8 12. i 11.7 
 
 32.3 32.7 32.4 
 
 27.1 26.9 26.7 
 41 .0 42. I 42.0 
 28.1 28.0 27.8 
 24.3 24.8 24.9 
 23-2 23.7 23.9 
 
 21.8 22. I 22.8 
 24.9 24.9 25.0 
 27.3 27.9 28.0 
 26.5 27. I 26.7 
 14.0 13.6 13.3 
 14.2 15.2 14.5 
 
 12.8 12.3 12.7 
 11.4 10.7 II . I 
 13.2 12.8 13.4 
 
 12.13 
 10.07 
 I3-I7 
 I4-83 
 11.87 
 
 32-47 
 26.90 
 41.70 
 
 27-97 
 24.67 
 23.60 
 22.23 
 24-93 
 27-73 
 26.77 
 
 13-63 
 14-63 
 12.60 
 ii .07 
 I3-I3 
 
 12.53 
 
 10.57 
 12.89 
 
 H-73 
 12.75 
 
 0-57 
 o-35 
 0.62 
 0.90 
 0.61 
 
 2-99 
 2.32 
 4.00 
 2-44 
 
 2. 12 
 I.9I 
 
 7-65 
 7-43 
 7.70 
 7.98 
 7.69 
 10.07 
 9.40 
 11.08 
 9-52 
 9. 20 
 8.99 
 
 8.06 
 7.84 
 8. ii 
 
 8-39 
 8.10 
 10.48 
 9.81 
 11.49 
 
 9-93 
 9.61 
 
 9.40 
 
 26.84 
 
 27.85 
 24.80 
 22.92 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 October 30. Quiet, dull. 
 
 22 48 
 
 23 17 
 
 37 
 35 
 
 33 
 
 o 
 a 
 b 
 c 
 r 
 P 
 
 9 E 
 D 
 D 
 E 
 1 
 P 
 r 
 c 
 b 
 a 
 
 
 
 27. I 28.0 27.3 
 30.7 30.2 30.0 
 32.0 32.9 33.0 
 31.1 31.7 31.1 
 
 10.8 IO.I IO.2 
 
 18.7 19.5 19.6 
 16.3 17.7 17.3 
 
 17.0 17.1 17.1 
 19.1 19.6 19.9 
 18.2 18.4 19.0 
 IS-' 15-7 5-8 
 15.0 16.2 15.9 
 18.1 18.5 19.1 
 ii .0 11.3 ii . i 
 30.9 31.4 31.8 
 32.7 32.9 32.7 
 30.0 29.7 30.2 
 29.0 27.8 28.3 
 
 27.60 
 30-30 
 32-63 
 3I-30 
 10.37 
 19.27 
 17.10 
 17.07 
 19-53 
 18-53 
 15-53 
 I5-70 
 18.57 
 11.13 
 31-37 
 32-77 
 29.97 
 
 28.37 
 
 27.99 
 
 30.14 
 32.70 
 
 31-34 
 10.75 
 18.92 
 16.40 
 16.30 
 19.03 
 
 2.56 
 
 2-73 
 3 .02 
 
 2.84 
 0.36 
 
 i-47 
 1.14 
 
 I . 12 
 
 1.48 
 
 8.91 
 9.08 
 
 9-37 
 9.19 
 6.71 
 7.82 
 7-49 
 7-47 
 7-83 
 
 9-32 
 9-49 
 9.78 
 9.60 
 7.12 
 8.23 
 7.90 
 7.88 
 8.24 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1903 November 17. 12-INCH. Good. 
 
 23 36 
 o 3 
 
 28 
 23 
 
 
 
 a 
 b 
 c 
 
 f 
 P 
 
 ?<H 
 ?OI 
 fa 
 
 f , 
 C 
 
 C 
 b 
 
 a 
 o 
 
 18.4 17.3 17.7 
 19.0 19.4 18.7 
 23.2 24.6 24.1 
 21.4 21.6 21.7 
 
 38.1 38.6 38.0 
 27.5 28.6 28.4 
 10.0 10.3 10.4 
 15.0 14.8 14.3 
 16.7 15-7 15-9 
 
 16. i 16.5 17.1 
 
 IO.2 II. I 10.4 
 
 28.2 29.0 29.5 
 
 38.8 38.0 37.9 
 
 20. o 20.4 20.7 
 
 23-7 23.1 23.2 
 
 18.9 18.8 19.7 
 17.8 18.7 17.7 
 
 17.80 
 19.03 
 23-97 
 21-57 
 38-23 
 28. 17 
 10.23 
 14.70 
 16. 10 
 
 i6.57 
 10.57 
 28.90 
 38.23 
 20.37 
 23-33 
 I9-I3 
 18.07 
 
 17-94 
 19.08 
 23-65 
 20.97 
 38-23 
 
 28.54 
 10.40 
 
 15-4 
 
 1.44 
 I. 60 
 2.08 
 
 1. 80 
 3-57 
 2.51 
 0.48 
 
 I.IO 
 
 8.88 
 9.04 
 
 9-52 
 9.24 
 ii .01 
 
 9-95 
 7.92 
 
 8-54 
 
 9-29 
 9-45 
 9-93 
 9.66 
 ii .42 
 10.36 
 8-33 
 8-95 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER IV.' W ANDROMEDA. 49 
 
 TABLE 27. 787 W ANDROMEDA. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1903 November 18. 12-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 p. 
 
 h m 
 
 22 40 
 
 23 3 
 
 
 
 37 
 33 
 
 
 
 a 
 b 
 c 
 g 
 
 P 
 1 
 (fai 
 
 ? 
 
 g 
 C 
 
 b 
 
 a 
 o 
 
 19.9 20.9 20. o 
 22. i 22.9 22. 7 
 26.5 27.2 26.9 
 22.7 23.8 23.4 
 39-7 40.7 40.0 
 31.9 32.1 32.7 
 
 II .0 12. I II . 2 
 
 9-7 9-3 9-2 
 16.1 15.8 16.3 
 10.7 ii. o 10.6 
 31.0 32.0 31.7 
 39.2 40.0 39.6 
 
 21.8 22.6 22. I 
 24.3 24.8 24.8 
 
 19.6 20. o 19.5 
 
 18.3 19. I 18.9 
 
 20.27 
 22.57 
 26.87 
 23 30 
 40.13 
 32-23 
 "-43 
 9.40 
 16.07 
 10.77 
 
 31-57 
 39.60 
 
 22. 17 
 
 24-63 
 19.70 
 
 18.77 
 
 I9-52 
 
 21 . 14 
 
 25-75 
 22.74 
 
 39-87 
 31-95 
 II . IO 
 9.24 
 
 1-65 
 1.83 
 2.26 
 
 2.OO 
 
 3-75 
 2.85 
 0.56 
 o.37 
 
 I . 21 
 
 8.96 
 9.14 
 9-57 
 9-31 
 ii .06 
 10. 16 
 7.87 
 7.68 
 8.52 
 
 9-37 
 9-55 
 9.98 
 9.72 
 11.47 
 10.57 
 8.28 
 8.09 
 8-93 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1903 November 19. Very good. 
 
 22 24 
 22 44 
 
 39 
 36 
 
 o 
 a 
 b 
 c 
 
 f 
 
 P 
 9ot 
 g a i 
 
 1 
 
 6 
 c 
 b 
 a 
 
 
 
 18.4 18.6 18.4 
 
 21.8 21 .0 21.7 
 
 22.9 24.0 23.5 
 
 21.3 22.3 22.2 
 
 37-9 39-0 38.7 
 32.0 31.1 31.2 
 9.8 9.8 10.0 
 14.0 15.0 15.0 
 15.0 14.3 15.1 
 
 9.3 10.3 ii. o 
 
 32.0 31.0 31.7 
 
 39-2 38.7 39-2 
 20 . 2 21.9 20 . 8 
 
 22.9 23.9 23.6 
 
 19.8 21 .6 21 . I 
 
 18.2 18.5 18.1 
 
 18.47 
 21.50 
 
 23-47 
 21.93 
 
 38-53 
 31-43 
 9.87 
 14.67 
 14.80 
 10.20 
 31-57 
 39-03 
 20.97 
 23-47 
 20.83 
 18.27 
 
 18.37 
 21.17 
 
 23-47 
 
 21-45 
 38.78 
 3i 50 
 10.04 
 
 14-74 
 
 1.50 
 
 1.8 3 
 2.06 
 
 1.86 
 
 3-64 
 2.80 
 
 0-45 
 1 .02 
 
 8.90 
 
 9-23 
 9.46 
 9. 26 
 ii .04 
 10. 20 
 7-85 
 8.42 
 
 9-31 
 9.64 
 9.87 
 9.67 
 
 "45 
 10. 61 
 8.26 
 8.83 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1902 November 7. 40-INCH Fair, uniform. 
 
 6 20 
 
 
 / 
 g 
 Cos 
 b m 
 
 z 
 u 
 
 W 
 
 \ 
 
 V 
 
 \y 
 
 W 
 
 u 
 
 M 
 
 Cat 
 
 f 
 
 12. I 12.7 13.6 
 
 21.7 22.5 24.2 
 18.2 19.8 18.8 
 
 21.2 21.4 21.8 
 
 40.7 41.8 41.3 
 
 34-8 35-7 34-3 
 39-' 38.9 38.9 
 44.0 45.6 44.0 
 
 53-2 54-i 54 o 
 33-8 33-2 32-9 
 44.2 45.0 45.8 
 38-5 39-5 40-0 
 32.2 32.8 33.7 
 42.9 42.5 42.6 
 
 22.8 21.8 22. O 
 
 18.3 19.2 19.5 
 
 23.0 22-3 22.8 
 13.2 15.0 15.0 
 
 12.80 
 22.80 
 18.93 
 
 21-47 
 41.27 
 
 34-93 
 38.97 
 44-53 
 53-77 
 33-30 
 45.00 
 
 39-33 
 32.90 
 42.67 
 
 22. 20 
 I9.OO 
 22.70 
 14.40 
 
 13.60 
 
 22.75 
 18.97 
 21.84 
 41-97 
 33-92 
 39- 5 
 44-77 
 
 0.86 
 
 2.OO 
 
 i-57 
 1.91 
 
 3-99 
 3-o6 
 3-68 
 4-30 
 
 5-H 
 3-00 
 
 IO. 12 
 II .26 
 10.83 
 11.17 
 
 "3-25 
 
 12.32 
 12.94 
 13-56 
 14.40 
 
 12.26 
 
 10.53 
 ii .67 
 ii .24 
 11.58 
 13-66 
 12.73 
 13 35 
 >3-97 
 14.81 
 12.67 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
50 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 27. 787 W ANDROMEDA. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1902 December 26. 40-INCH. Clear; somewhat unsteady. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 It m 
 5 50 
 
 O 
 
 / 
 g 
 
 C a i 
 
 ba- 
 il 
 
 TV 
 
 y 
 
 u 
 
 z 
 b<u 
 Cai 
 
 f 
 
 15.0 15.8 17.0 
 24.8 24.7 26.3 
 20. o 21.4 21 .6 
 22.4 23.8 22.9 
 20.9 20.9 21 .6 
 
 42.3 41.9 41-4 
 
 46.7 47-3 47-9 
 37.7 38.8 38.2 
 46.2 46.0 45.9 
 22.3 23.4 24.8 
 
 24.5 22.8 23.8 
 24.2 24.8 25.8 
 
 16.0 17.8 16.2 
 
 15-95 
 25-27 
 
 21 .OO 
 
 23- 3 
 21.13 
 41.87 
 47-30 
 38.23 
 46.03 
 23.50 
 23.70 
 
 24-93 
 16.67 
 
 16.31 
 25.10 
 
 22.35 
 23.27 
 
 1.23 
 
 2.21 
 I .96 
 2.05 
 1.84 
 3-97 
 
 4-54 
 3-57 
 4-44 
 
 IO.2I 
 II . IQ 
 10.94 
 11.03 
 10.82 
 12.95 
 13-52 
 12.55 
 13-42 
 
 10.62 
 ii .60 
 ii-35 
 "44 
 11.23 
 
 13-36 
 13-93 
 12.96 
 
 13-83 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 January 31. Good. 
 
 5 30 
 
 5 50 
 
 39 
 
 / 
 g 
 Cai 
 
 6ai 
 
 V 
 X 
 
 w 
 
 y 
 
 u 
 
 2 
 Z 
 U 
 
 y 
 
 w 
 \ 
 
 V 
 
 6, 
 
 Cai 
 
 I 
 
 10.7 10.9 ii. o 
 19.1 20. 6 19.7 
 5-6 6.8 7.5 
 9.7 9.2 8.6 
 29.8 30.4 30.2 
 53-5 53-9 53-4 
 35-3 36.2 36.4 
 41-5 43-5 42-3 
 29.9 29.8 29.6 
 38.0 38.2 38.5 
 39-8 39-o 39-0 
 30.0 30.6 31.1 
 42.1 41.7 42.1 
 35-2 35-3 35-i 
 49-5 5'-7 5i.o 
 29-7 3i-o 30-3 
 11.5 10.8 12.7 
 6.1 7.2 8.5 
 
 2O. O 21. O 2O. O 
 12. I II .2 II.3 
 
 17.8 18.1 17.8 
 
 10.87 
 19.80 
 6.63 
 9-17 
 30.13 
 53-60 
 
 35-97 
 42-43 
 29-77 
 38.23 
 39-27 
 30-57 
 41-97 
 35-20 
 
 50.73 
 30.33 
 ii .67 
 7.27 
 20.33 
 
 "53 
 17.90 
 
 ii .20 
 20.06 
 
 6-95 
 10.42 
 30.23 
 52.16 
 35.58 
 42.20 
 30.17 
 38-75 
 
 0.57 
 1.72 
 o. 16 
 0.49 
 2.67 
 5-00 
 
 3-25 
 4.02 
 2.67 
 3-63 
 
 ii. 3' 
 
 ii .46 
 9.90 
 10.23 
 12.41 
 
 14-74 
 12.99 
 13-76 
 12.41 
 13-37 
 
 10. 72 
 11.87 
 10.31 
 10.64 
 12.82 
 15-15 
 13-4 
 14.17 
 12.82 
 13-78 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER IV. W ANDROMEDA. 
 
 TABLE 28. 787 W ANDROMEDA. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 1903 December 6. 1903 
 
 December 21. 1904 October 30. 
 
 Star. Obs. Mag. 4 Mag. Obs 
 
 . Mag. J Mag. Obs. Mag. 4 Mag. 
 
 C - H. P. H. P. ' H. 
 
 P. H. P. H. P. H. P. 
 
 ) 0.81 7. 70 8. II +.09 .03 0.57 7.6 
 
 5 8.06 + .04 .08 1.48 7.83 8.24 + .22 + . IO 
 
 3 7.84 .01 .08 1. 12 7.47 7.88 + .03 .04 
 4 7-35--2+- I 5 0.36 6.71 7.12 -.25 - .08 
 
 E O ^2 7 41 7 82 O3 IO O "JS 7 4 
 
 f . . OOI 6.90 7.31. O6 +.11' 0.14 6.9 
 
 
 Means.. 0.45 7.34 7. 75 . 06 . 08 0.26 7.3 
 M, 6.89 7.30] 7.0 
 
 4 7-75 -02 . 10 0.99 7.34 7. 75 .17 .07 
 8 7.49 6.35 6.76 
 
 12-INCH. 
 
 40-INCH. 
 
 . Mae. . C " 
 
 May. C> 
 
 6-mcn. Nov. i 7 . Nov. I& Nov. 19. 
 
 i2-mch. Nov. 7. Dec. 26. Jan. 31. 
 
 o . . 8.98 i 44 i 65 i 50 I 
 
 '.. QC7 OIO O."^ O^^ 
 
 a 9.12 i 60 i 83 i . 83 c 
 
 928 0,15 0.24 o 68 
 
 i> . . 7.00 0.48 o. s6 O.4S / 
 
 IOI2 O.S6 1-23 O57 
 
 q 7 63 o 26 o 37 o 18 6 
 
 
 
 
 Mean C o 95 i 10 I 20 1 
 
 lean C 0.72 i .00 o 32 
 
 Mean Mag. 8.41 8.41 8.41 8.41 ] 
 M 7.46 7.31 7.42 ^ 
 
 lean Mag. 10.00 10.00 10.00 10.00 
 1 9.28 9.00 9.68 
 
 MAGNITUOC 
 
 H is 12 n 10 9 a 7 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 SO 
 
 
 
 ::::::::::::::::::::::;gj::::: ::.::._::: 
 
 
 t\ i '.". 
 
 " - 787 W ANDROMEPA E ; 
 
 
 
 
 
 
 
 ~~ f' 
 
 
 -__^ 1 L^ 
 
 
 
 
 ::::ffS ::::;;::+:::::::::::::::;:::: 
 
 
 
 
 
 
 
 
 
 
 
 
 
 J0 r|5 - :::::;i 
 
 
 * 
 
 
 A. 1 1- 
 
 
 S 2'ir 
 
 
 c :::~ ::::;:: - ......."....... ,i.Z..... 
 
 
 In . 
 
 
 <" 7 J 
 
 
 
 
 10 :i::.; F-* ! -' 
 
 
 ;S:: : 
 
 
 "3- -C 
 
 
 ^< x r 
 
 
 : zip. .4: ^:;n^g+ ..:....:::::: 
 
 
 | t :::;;:::::: :: | 
 
 
 
 
 ::::::::::::: jiiii:: ::::::: ::::::: 
 
 
 
 
 
 
 :::::::|r! E g:::|:::::::::::::::::: 
 
 
 :::SsE:: 
 
 
 ,::::::::::::::::::::::: ::::: 
 
 
 :;i!s?:::::: ::::::::::: ^ 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 FIG 10. MAGNITUDE-CURVE FOR W ANDROMEDA. 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 29. 787 W ANDROMEDA. MEAN MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 December 6. 
 
 December 21. 
 
 October 30. Mean. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag.H. 
 
 Wag. P. 
 
 J Mag. 
 
 D 
 E 
 
 r 
 
 a 
 b 
 c 
 
 
 
 P 
 
 1 
 
 7.70 
 7.41 
 6.90 
 
 Mean.. 
 
 9.09 
 9-39 
 9.23 
 9-05 
 7.89 
 7-71 
 
 Mean.. 
 
 -0.03 
 -0.03 
 + 0.05 
 
 7-65 
 7-43 
 6.94 
 
 -0.08 
 
 O.OI 
 
 + o 09 
 
 7-83 
 7-47 
 6.71 
 
 4-o. 10 
 4-0.03 
 o. 14 
 
 7-73 
 7-44 
 6.85 
 
 8.14 
 
 7-85 
 7.26 
 
 0.07 
 0.02 
 0.09 
 
 7-34 
 
 7-75 
 
 0.06 
 
 o . 03 
 0.04 
 0.04 
 + 0.07 
 
 O.OI 
 
 +0.08 
 
 9.20 
 9-52 
 9.40 
 8.99 
 7.98 
 7.70 
 
 + 0.08 
 + 0.09 
 + o. 13 
 
 + O.OI 
 
 4-0.08 
 4-0.07 
 
 9.08 
 
 9-37 
 9.19 
 8.91 
 7.82 
 7-49 
 
 0.04 
 0.06 
 -0.08 
 0.07 
 0.08 
 o. 14 
 
 9.12 
 9-43 
 9-27 
 8.98 
 7.90 
 7 63 
 
 9-53 
 
 9-84 
 9.68 
 
 9-39 
 8.31 
 8.04 
 
 0.05 
 0.06 
 0.08 
 0.05 
 0.06 
 
 O. 10 
 
 8.72 
 
 9-13 
 
 0.07 
 
 
 
 
 
 
 12-INCH. 
 
 Star. 
 
 November 17. 
 
 November 18. 
 
 November 19. 
 
 Mean. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 J Mag. 
 
 
 
 a 
 P 
 1 
 
 b 
 c 
 f 
 g 
 
 8.90 
 9.06 
 
 7-94 
 
 7-72 
 
 Mean.. 
 
 9-54 
 9.26 
 
 9-97 
 11.03 
 
 Mean.. 
 
 + 0.03 
 
 O. IO 
 
 +0.05 
 +0.05 
 
 8.96 
 9.14 
 
 7.87 
 7.68 
 
 4-0.05 
 o.oo 
 
 O.O2 
 
 4-0.01 
 
 8.92 
 9-25 
 
 7-87 
 7.60 
 
 O.OI 
 
 4-o. 10 
 
 O.O2 
 
 0.07 
 
 8-93 
 9 i5 
 7.89 
 7.67 
 
 9-34 
 9-56 
 8-30 
 8.08 
 
 0.03 
 0.07 
 0.03 
 0.04 
 
 8.41 
 
 8.82 
 
 0.04 
 
 -t-O.OI 
 O.O2 
 -0.15 
 O.O2 
 
 9-57 
 9 3' 
 10. 16 
 ii .06 
 
 + 0.04 
 4-0.03 
 4-0.04 
 4-o. 01 
 
 9.48 
 9.28 
 
 IO.22 
 II. O6 
 
 0.05 
 o.oo 
 4-o. 10 
 4-0.01 
 
 9-53 
 9.28 
 
 IO. 12 
 
 11.05 
 
 9-94 
 9.69 
 
 10.53 
 ii .46 
 
 0.03 
 0.02 
 
 0.10 
 
 0.01 
 
 IO.OO 
 
 10.41 
 
 0.04 
 
 
 
 
 
 
 40-INCH. 
 
 Star. 
 
 November 7. 
 
 December 26. 
 
 January 31. 
 
 Mean. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 4 Mag. 
 
 Mag. H. Mag. P. A Mag. 
 
 6 
 c 
 
 i 
 g 
 
 u 
 
 W 
 
 y 
 
 z 
 1 
 
 9-47 
 9-i3 
 10. 14 
 11.28 
 
 Mean. 
 
 12.34 
 12.96 
 I3-58 
 13-27 
 14.42 
 
 Mean. 
 
 + 0.09 
 
 + O.OI 
 
 0.07 
 
 O.O2 
 
 9-33 
 9.24 
 10.23 
 
 I I . 21 
 
 -0.05 
 
 + O. 12 
 4-O.O2 
 
 0.09 
 
 9-33 
 9.00 
 10.25 
 11.40 
 
 0.05 
 
 O. 12 
 
 4-0.04 
 4-o. 10 
 
 9 38 
 9.12 
 
 IO.21 
 11-30 
 
 9-79 
 9-53 
 10.62 
 11.71 
 
 0.06 
 0.08 
 0.04 
 0.07 
 
 IO.OO 
 
 10.41 
 
 0.06 
 
 0.08 
 + O.OI 
 
 0.03 
 0.07 
 
 -0.13 
 
 12-57 
 
 12-97 
 13-54 
 13-44 
 
 4-0. 15 
 4-0.02 
 0.07 
 4-o. 10 
 
 12-35 
 12.93 
 
 I3-70 
 I3-3I 
 14.68 
 
 0.07 
 
 O.O2 
 
 4-0.09 
 -0.03 
 4-0.13 
 
 12.42 
 12.95 
 13.61 
 13-34 
 H-55 
 
 12.83 
 I3-36 
 14.02 
 
 13-75 
 14.96 
 
 0.10 
 0.02 
 0.06 
 0.07 
 
 (0.13) 
 
 
 
 0.06 
 
 
 
 
 
 
 
 
CHAPTER IV. W ANDROMEDA. 
 
 53 
 
 TABLE 30. 787 W ANDROMEDA. VISUAL OBSERVATIONS OP THE VARIABLE. 
 
 No 
 
 Date. 
 
 tH 
 
 g 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 A Mag. 
 
 Month 
 and Day 
 
 Hour 
 C.S.T 
 
 Julian 
 Day, 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 i 
 
 2 
 
 3 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 10 
 ii 
 
 12 
 '3 
 14 
 15 
 
 16 
 
 17 
 
 18 
 
 19 
 20 
 
 21 
 22 
 
 23 
 24 
 
 25 
 26 
 
 27 
 28 
 29 
 
 30 
 
 3i 
 32 
 33 
 
 34 
 
 35 
 36 
 37 
 38 
 
 39 
 
 40 
 
 4i 
 42 
 43 
 
 44 
 
 45 
 46 
 
 47 
 
 1899 
 Feb. 6 
 15 
 24 
 28 
 Mar. 6 
 
 13 
 18 
 28 
 Apr. 4 
 
 12 
 
 May 21 
 June 10 
 
 July 5 
 29 
 Aug. 10 
 30 
 Sept. 4 
 13 
 25 
 
 Oct. 2 
 
 18 
 
 23 
 28 
 Nov. 4 
 
 '5 
 26 
 Dec. 4 
 '9 
 23 
 29 
 
 1900 
 Jan. 4 
 
 22 
 31 
 
 Feb. 1 6 
 
 2 5 
 Mar. 9 
 
 22 
 
 3' 
 Apr. 17 
 May 20 
 28 
 June 19 
 July 25 
 
 Aug. 29 
 
 Oct. 4 
 25 
 
 1901 
 Feb. 9 
 
 7 
 7 
 7 
 8 
 8 
 8 
 8 
 8 
 8 
 8 
 15 
 15 
 15 
 10 
 
 9 
 9 
 9 
 
 8 
 
 7 
 8 
 
 7 
 7 
 
 7 
 8 
 
 7 
 
 7 
 7 
 7 
 7 
 7 
 
 7 
 7 
 7 
 
 7 
 8 
 7 
 7 
 8 
 
 9 
 >4 
 '4 
 14 
 15 
 
 '5 
 
 8 
 7 
 
 7 
 
 2410000+ 
 4692 . 54 
 47i 54 
 4710.54 
 47I4-56 
 4720.56 
 4727-56 
 4732-56 
 4742.56 
 4749-56 
 4757-56 
 4796.88 
 4816.88 
 4841.88 
 4865.67 
 
 4877-63 
 4897 . 63 
 4902.61 
 4911.58 
 4923-54 
 4930.58 
 4946 54 
 
 4951-54 j 
 
 4956.54 
 4963 56 
 
 4974-54 
 
 4985 - 52 
 4993 54 
 5008.54 
 5012.54 
 5018.54 
 
 5024.54 
 5042 . 54 
 5051.52 
 
 5067 . 54 | 
 
 5076.58 
 5088.54 
 5oi.54 
 5o.56 | 
 
 5127.61 
 5160.83 
 5168.83 
 5190.83 
 5226.88 
 
 5261.88 
 
 5297-58 
 5318.52 
 
 5425-54 
 
 80 
 'SO 
 'SO 
 150 
 'SO 
 ISO 
 'SO 
 'SO 
 'SO 
 150 
 'SO 
 
 '50 
 
 150 
 '50 
 'SO 
 '50 
 'SO 
 150 
 '50 
 80 
 40 
 '50 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 40 
 40 
 
 40 
 40 
 40 
 40 
 '50 
 So 
 '50 
 So 
 40 
 '50 
 '50 
 '50 
 275 
 350 
 460 
 
 460 
 
 237 
 67 
 
 40 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 
 12 
 6 
 12 
 
 6 
 
 6 
 6 
 6 
 
 12 
 
 40 
 40 
 
 40 
 
 40 
 
 12 
 
 6 
 
 64-51; , 04-51;, vf, D3-4d,d5&. 
 04-5-11, /2i>, Did, -v very red 
 
 d\ J.D /6l) 2)^4(7 
 
 29.9, 30.2, 29.3, 29... 
 30.2, 27.3, 26.8 
 22.3, 23.3, 23.7 . 
 
 23-3, 25.8, 22.2 . 
 22.3, 23.8, 22.2 . 
 20. 8, 20.2, 21 .9 . 
 18.3, 2O. 2, 20.9 . 
 
 16.2, 16.9, 16.9 . 
 
 29.7 
 28.1 
 23.1 
 
 23-7 
 22.7 
 20.9 
 19.8 
 16.6 
 14.4 
 <i6 
 <i6 
 <'5 
 
 <20 
 
 <'4 
 <i6 
 16.8 
 19.8 
 21.3 
 
 24-4 
 24.6 
 
 3'-9 
 33-9 
 
 36.5 
 40. i 
 
 47-5 
 
 48-5 
 52.' 
 47-8 
 48.7 
 47-9 
 
 47-o 
 46 5 
 44.2 
 
 36.8 
 
 35-3 
 30-3 
 28.8 
 
 24.7 
 
 19.0 
 <'5-9 
 
 7-7 
 6.1 
 3-0 
 
 3-6 
 
 ii. 8 
 '3-8 
 
 45-2 
 
 10.06 
 10.31 
 10.92 
 10.88 
 10.98 
 ii .20 
 11.32 
 11.71 
 12.08 
 <n.8 
 <n.8 
 < ii .9 
 <"-3 
 
 < 12. O 
 
 <n.8 
 ii .70 
 11.32 
 11.15 
 10.78 
 10.76 
 9-85 
 9.60 
 
 9.40 
 8.80 
 
 7.84 
 
 7.66 
 7.16 
 7.78 
 7-76 
 
 7-77 
 
 7.89 
 7 95 
 8.27 
 
 9.22 
 
 9.42 
 10. 06 
 10.23 
 
 10-73 
 ii .41 
 <n.8 
 
 12-73 
 12.90 
 
 '3-23 
 13-18 
 12.27 
 
 I 2. O2 
 
 8. II 
 
 good 
 moon 
 fair 
 good 
 good 
 good 
 fair 
 good 
 fair 
 fair 
 fair 
 good 
 poor 
 good 
 fair 
 fair 
 fair 
 fair 
 fair 
 good 
 poor 
 
 good 
 
 good 
 good 
 
 fair 
 
 good 
 good 
 good 
 good 
 good 
 
 good 
 good 
 good 
 
 good 
 
 good 
 good 
 fair 
 
 good 
 
 low 
 low 
 
 o 
 
 9 
 
 18 
 
 22 
 
 28 
 
 35 
 40 
 50 
 
 57 
 
 205 
 
 2IO 
 
 2I 9 
 231 
 2 3 8 
 254 
 259 
 26 4 
 271 
 
 282 
 
 293 
 301 
 3'6 
 320 
 326 
 
 332 
 350 
 
 359 
 375 
 
 384 
 o 
 
 '3 
 
 22 
 
 39 
 
 80 
 
 IO2 
 138 
 
 '73 
 
 209 
 230 
 
 337 
 
 + 0.08 
 + 0.04 
 + 0.31 
 + 0.18 
 + 0.03 
 
 O.OI 
 
 0.09 
 0.04 
 
 + O. IO 
 
 0.07 
 
 -0.31 
 
 -0.35 
 -0.15 
 +0.13 
 -0.03 
 
 0.03 
 
 + O. IO 
 0.09 
 
 -0.28 
 o. 19 
 
 -0.54 
 +0.23 
 +0.08 
 
 + O. IO 
 
 +0.09 
 -0.36 
 -0.33 
 
 + O.IO 
 
 0.04 
 +0.04 
 -0.17 
 
 +0.03 
 + 0.04 
 
 + o. 14 
 
 + O.O2 
 
 +0.30 
 + 0.70 
 
 4-0.62 
 + 0.07 
 
 + 0.17 
 
 /6i) Tjd v2g 
 
 
 
 d~j SD gii vim 
 
 (741), 77131) DI/I 
 
 
 v not seen, limit c 
 
 
 D not seen h glimpsed . . . 
 
 
 D not seen, limit i < h .... 
 
 
 v not seen, limit m 
 
 
 D not seen, limit 2</i ... 
 
 
 "v not seen limit h 
 
 
 J31;, DO I ft 
 
 '7-2, '6.4 
 
 21.2, 18.4, 19.8 . 
 21.2, 2O.9, 21.8, 21.; 
 24-3. 23.9, 24.2 ... 
 24.8, 24.4, 24.7 . . 
 30.4, 30.7, 34.8 . . 
 
 33-9, 34-4, 33-8 {. 
 33-7, 33-9. 34-3 > 
 35-7, 37-3 
 37-7, 40-8, 42.0 . . 
 44.7, 46.8, 50.0 \ 
 48 . 5, 47 . 5 > 
 
 vig vim Tn d^^v 
 
 di2'v 1)4771 D4<7 
 
 div, 1)4 SOT, 1)4 5<7 
 641), 041;, 1)8 lod 
 CID D& ^4~5/ 
 
 CID 60 ID D5/ 
 
 Die, ao-iD 
 
 D3C, D3O, DO 
 
 DIOC, vga, D8o , D2p, qiv. i 
 
 D3p, r6D, D2g 
 ro ID D6p . . 
 
 49-5, 46-2, 50-5 
 
 ryv, D2p 
 
 T$V, D3~ 4p, D6fl 
 r4~ 5D, DI 2p, 1l6o 
 
 D6o, D2-3P, rSi> 
 
 Dip, D3-40 
 D2p, D2O, 
 O5D, O2D, D2&, D3C 
 D2&, D3C 
 IJI-2D, D& 
 
 641), D/, D5-6d 
 D/, D2 3d 
 /4~ SD, Did 
 
 47-2, 48-5 
 48.2, 50.0, 48.0 
 47.7, 48.0, 48.0 . . 
 
 48 . o, 49 . o, 44 . 2 
 47-5, 45-5 
 44-5, 44-o 
 37-0, 35.8, 36.4,]. 
 37-7, 36.4, 37-7- / 
 36.3, 34-4 
 30.4, 29.3, 31.3 . . 
 29-3, 28.3 
 24.8, 26.8 > 
 
 /5D dlD, D3?W 
 
 24.3, 24.8, 22.9 f 
 '9-2, '8.9 
 
 giv, D3/i 
 D not seen, limit h 
 
 A8-IOD, UO-IV, V2W 
 
 U2D, viw, D2J/, limit j/ 
 W2 3D, DI 2z, 115 6D, vy... 
 
 W&-8D, tO ID, 1)40, V2Z, VI-2y ( 
 1)2U 
 
 6-9-. 9-3, 7-0 
 7.8, 6.0, 4.5 
 
 2-5, 3-o, 4-3 2.5 
 2.8, 4.0, 4.0 . . .) 
 3-5, 4-o i 
 
 moon 
 fair 
 
 moon 
 good 
 
 fair 
 
 D4U, tl2V 
 pi 2D, D3~ 40 
 
 13-8, '3-9 
 45-0, 45.5 
 
54 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 30. 787 W ANDROMEDA. VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 y 
 
 "3 
 
 u 
 
 O 
 
 1 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 
 
 d Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day, 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 48 
 
 49 
 50 
 51 
 52 
 53 
 54 
 55 
 56 
 
 57 
 58 
 59 
 60 
 61 
 62 
 
 63 
 
 64 
 65 
 66 
 
 67 
 68 
 69 
 
 70 
 
 71 
 72 
 73 
 74 
 75 
 76 
 77 
 78 
 79 
 80 
 
 1901 
 Nov. i 
 
 1902 
 Jan. 12 
 Feb. 4 
 Mar. 4 
 
 27 
 Apri 2 
 Oct. i 
 Nov. 7 
 Dec. 26 
 
 1903 
 Oct. 1 1 
 
 13 
 Nov. ii 
 17 
 Dec. 6 
 
 21 
 1904 
 
 Jan. 8 
 Aug. 29 
 Oct. 6 
 30 
 
 1905 
 Jan. 28 
 Feb. 9 
 25 
 Mar. 3 
 
 24 
 Apr. 7 
 June 13 
 Aug. 9 
 28 
 Sept. 17 
 Oct. i 
 
 20 
 
 Dec. 23 
 30 
 
 7 
 
 9 
 
 7 
 9 
 
 IO 
 
 7 
 7 
 
 8 
 ii 
 9 
 
 9 
 
 8 
 8 
 
 7 
 
 7 
 8 
 
 15 
 '5 
 9 
 
 8 
 
 9 
 
 8 
 
 IO 
 
 9 
 
 2410000 + 
 569 54 
 
 5762 
 5785 
 5813 
 5836 
 5842 
 6023.63 
 6061 
 6110 
 
 6399-54 
 6401 .63 
 6430 
 6436.67 
 
 6554-54 
 6470.54 
 
 6488.54 
 6722.58 
 6760.71 
 6784.63 
 
 6874.63 
 6886.58 
 6902 . 56 
 
 6908 . 54 - 
 
 6929.54 
 6943-58 
 7010.83 
 7067.83 
 7086 . 64 
 7106.58 
 7120.63 
 
 7137-54 
 7203.70 
 
 7210.63 
 
 2 75 
 
 237 
 67 
 67 
 67 
 237 
 237 
 237 
 
 150 
 80 
 67 
 67 
 40 
 40 
 
 67 
 15 
 40 
 
 450 
 
 237 
 275 
 237 
 67 
 
 275 
 150 
 40 
 20 
 15 
 150 
 150 
 237 
 80 
 
 237 
 237 
 
 12 
 
 24 
 4 
 12 
 12 
 12 
 40 
 40 
 40 
 
 6 
 
 12 
 12 
 
 12 
 
 6 
 6 
 
 12 
 
 6 
 6 
 40 
 
 40 
 
 12 
 40 
 12 
 12 
 6 
 6 
 
 5 
 6 
 6 
 6 
 40 
 
 12 
 40 
 
 40 
 
 (vh, V4U ) 
 
 ic o. 1-2 8 . . 
 
 14.8 
 
 ii .92 
 
 good 
 
 206 
 
 278 
 301 
 329 
 352 
 
 + 0.18 
 
 -0.63 
 0.61 
 
 -limit 3-4 <u, or 2 < 10, S 
 ( or 2<x ) 
 
 photograph 
 
 
 v very bright and very red 
 photometer 
 
 
 
 7.8 
 7.11 
 
 7-75 
 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 112-311, ii2-yw 
 photometer 
 
 7-3, 7-5 
 
 7-4 
 
 12.77 
 
 12. 24 
 I0.8O 
 
 <I2.5 
 12.72 
 
 12.88 
 12.66 
 11.71 
 11.08 
 
 10.80 
 11.63 
 <n.8 
 13-I9 
 
 12.05 
 
 <I2. 5 
 11-50 
 
 II .70 
 10.80 
 9.SI 
 
 7-95 
 10. 71 
 10.94 
 
 11-73 
 12.15 
 
 12-33 
 13.81 
 
 13-88 
 
 poor 
 
 good 
 good 
 good 
 good 
 good 
 good 
 
 good 
 fair 
 fine 
 good 
 
 good 
 poor 
 good 
 
 good 
 
 fair 
 good 
 good 
 good 
 fair 
 fair 
 fair 
 good 
 fair 
 
 good 
 
 '43 
 181 
 230 
 
 123 
 125 
 154 
 1 60 
 178 
 194 
 
 212 
 50 
 
 88 
 
 112 
 
 2O 2 
 214 
 230 
 
 2 3 6 
 
 257 
 271 
 338 
 
 
 18 
 38 
 52 
 69 
 135 
 142 
 
 -0.13 
 
 O. IO 
 
 -0.15 
 -0.27 
 
 + O. IO 
 
 0.04 
 -0.68 
 -0.97 
 
 -0.79 
 
 O. 12 
 + 0.24 
 
 + O.2O 
 
 + O.6O 
 + I .00 
 + I.I5 
 
 +0-73 
 + 0.23 
 + 0.81 
 
 + 0-34 
 + 0.38 
 + 0.30 
 o.oo 
 4-0.82 
 
 + 0.92 
 
 photometer 
 
 
 
 11 not seen limit u 
 
 
 7-7 
 6-3 
 8.4 
 16.6 
 
 uiv, 7/42 
 
 88, s S . . 
 
 photometer also 1*341'. . . . 
 
 
 photometer, also uiv, v6z. 
 photometer, also g4v, nih. . 
 
 8 8 7 s 
 
 16.2, 16.9 
 
 
 26.8, 21.7 
 
 24.2 
 17-2 
 
 3-5 
 
 v not seen limit h 
 
 
 win v\*. . ... 
 
 A O T. O 
 
 photometer 
 
 
 a not seen, u glimpsed . . 
 
 g(>ii, v2h, C2b 
 w,x,y and z seen, a glimpsec 
 
 cm vib, i>5/ 
 
 
 Is. 3 
 16.7 
 24.2 
 34-5 
 46-5 
 25-0 
 23.1 
 16.5 
 
 12.8 
 II .2 
 
 2.2 
 
 -2.9 
 
 20. 2, 14. 2, 18.4 . . 
 14-2, 17-9 I 
 
 24-8, 23.7 
 
 33-7, 35-4, 34-3 
 
 (3411, i>4g, C2~3b 
 
 d23V, V2<J, /5~- 67?, C2& 
 
 04-51;, vih 
 
 h^V, VI 2U 
 
 25-8, 24.2 
 
 23.3, 22.2, 23.8 . 
 
 15-7, 16.9 
 ii. 9. 13-8 
 10.9, 11.3 
 
 I . O, 2 . O, 5.O 
 
 -s'-o 3 / 
 
 Z4.V n "\V V^B, V^y 
 
CHAPTER IV. W ANDROMEDA. 
 
 55 
 
 
 
 
 
 I 
 
 1 
 1 
 
 S, 
 
 FJO. ii. LIGHT-CURVE OF W ANDROMEDA. 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 TABLE 31. MEAN MAGNITUDES FROM 33 DAY GROUPS. 
 
 Group No. . 
 T D. ., 
 
 i 
 
 -3-1 
 
 2 
 
 66 
 
 3 
 
 4 
 
 5 
 i6c 
 
 6 
 
 7 
 
 8 
 
 9 
 
 IO 
 
 ii 
 iffi 
 
 12 
 inf. 
 
 
 
 
 
 
 
 
 
 
 
 
 33 
 
 
 f t 
 
 15 
 
 46 
 
 
 
 
 
 211 
 
 24.6 
 
 278 
 
 Ti6 
 
 
 380 
 
 , j M 
 
 IO.63 
 
 11.58 
 
 
 
 
 
 II .39 
 
 102^ 
 
 8 42 
 
 7 . Q 
 
 8 04 
 
 Q 12 
 
 4 6 9 2 j JM 
 
 + o. 13 
 
 O.OI 
 
 
 
 
 
 O 24. 
 
 O O2 
 
 
 O O"* 
 
 
 
 I No. 
 
 5 
 
 4 
 
 
 
 
 
 7 
 
 
 
 
 
 
 r 
 
 12 
 
 39 
 
 80 
 
 I O2 
 
 M8 
 
 17-3 
 
 2 2O 
 
 
 
 ^7 
 
 
 
 oJ M 
 
 to. 34 
 
 ii .41 
 
 12 71 
 
 12 QO 
 
 1^2^ 
 
 13 18 
 
 12 14. 
 
 
 
 8 II 
 
 
 
 5 88 i JM 
 I No. 
 
 f < 
 
 -0.03 
 3 
 
 + 0.04 
 
 i 
 
 + o. 14 
 
 I 
 
 + O.O2 
 
 I 
 
 + 0-30 
 I 
 
 + 0.70 
 
 i 
 
 + 0-34 
 2 
 
 2O6 
 
 
 
 + o. 17 
 
 I 
 ^2Q 
 
 
 
 o J M 
 
 
 
 
 
 
 
 1 1 Q2 
 
 
 
 
 
 
 5484 JM 
 
 
 
 
 
 
 
 + o 18 
 
 
 
 O 6^ 
 
 
 
 L No. 
 
 
 
 
 
 
 
 I 
 
 
 
 I 
 
 
 
 r < 
 
 
 
 
 
 14. -7 
 
 181 
 
 230 
 
 
 
 
 
 
 , j M 
 
 
 
 
 
 12 77 
 
 12 2J. 
 
 10 80 
 
 
 
 
 
 
 5 88 JM 
 
 
 
 
 
 O 1 1 
 
 O IO 
 
 O IS 
 
 
 
 
 
 
 L No. 
 
 
 
 
 
 I 
 
 I 
 
 I 
 
 
 
 
 
 
 r * 
 
 
 
 
 12*; 
 
 i <;7 
 
 1 86 
 
 212 
 
 
 
 
 
 
 ,,! M 
 
 
 
 
 12 72 
 
 12 77 
 
 1 1 4.O 
 
 to 80 
 
 
 
 
 
 
 6276 i JM 
 
 
 
 
 O 27 
 
 + O.O^ 
 
 0.82 
 
 O 70 
 
 
 
 
 
 
 L No. 
 
 
 
 
 
 2 
 
 2 
 
 I 
 
 
 
 
 
 
 r < 
 
 
 50 
 
 
 112 
 
 
 
 216 
 
 
 
 
 
 
 fi ,,,l M 
 
 
 ii .63 
 
 
 I"*. 10 
 
 
 
 II .78 
 
 
 
 
 
 
 6672 JM 
 
 
 O. 12 
 
 
 -f o. 24 
 
 
 
 + 0.40 
 
 
 
 
 
 
 L No. 
 
 
 I 
 
 
 I 
 
 
 
 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r t 
 
 Means 
 L No. 
 
 14 
 10.48 
 + 0.07 
 8 
 
 45 
 "54 
 
 T-O.O2 
 
 6 
 
 80 
 
 12-73 
 + o. 14 
 i 
 
 "3 
 12.94 
 
 o.oo 
 3 
 
 146 
 12.92 
 -1-0.06 
 
 4 
 
 1 80 
 
 12.27 
 -0.31 
 
 4 
 
 216 
 11.47 
 O.OO 
 IO 
 
 246 
 10.25 
 
 O.O2 
 
 4 
 
 278 
 8.42 
 0.12 
 
 4 
 
 327 
 7.6O 
 O.IO 
 
 6 
 
 350 
 7.00 
 0.30 
 
 4 
 
 380 
 
 9-32 
 -f 0.03 
 
 3 
 
 TABLE 32. 787 W ANDROMEDA. OBSERVED MAXIMA AND MINIMA. 
 
 Elements of maximum. 1899 Dec. 16 (J. D. 2415005)+396' E. M - m=192 d . 
 
 MAXIMA. 
 
 MINIMA. 
 
 t" 
 
 Date. 
 
 Mag. 
 
 
 
 j 
 
 Date. 
 
 Mag. 
 
 
 
 
 
 
 Corr. 
 
 Wt. 
 
 1 
 
 
 
 Corr. 
 
 Wt. 
 
 
 
 
 
 
 
 
 
 W 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 
 
 W 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 
 
 o 
 
 1899 Dec. 7 
 
 4996 
 
 7.42 
 
 7.83 
 
 - 9 
 
 27 
 
 o 
 
 1899 June 1 6 
 
 4819 
 
 13.0 
 
 '3-4 
 
 + 6 
 
 20 
 
 i 
 
 1901 Jan. 15 
 
 5400 
 
 
 me 
 
 i 
 
 i 
 
 i 
 
 1900 July 23 
 
 5224 
 
 13-36 
 
 13-77 
 
 + 5 
 
 9 
 
 2 
 
 1902 Feb. 28 
 
 5809 
 
 7-4 
 
 7.8 
 
 + 12 
 
 4 
 
 2 
 
 1901 Aug. 13 
 
 5610 
 
 
 me 
 
 + 5 
 
 i 
 
 3 
 
 1903 Mar. 1 6 
 
 6190 
 
 
 me 
 
 - 3 
 
 i 
 
 3 
 
 1902 Aug. 31 
 
 5993 
 
 13.0 
 
 13-4 
 
 - 8 
 
 2 
 
 4 
 
 1904 Apr. !7 
 
 6588 
 
 
 me 
 
 i 
 
 i 
 
 4 
 
 1903 Sept. 25 
 
 6383 
 
 13 o 
 
 13-4 
 
 14 
 
 5 
 
 
 
 
 
 
 
 
 5 
 
 1904 Nov. 15 
 
 6800 
 
 13-34 
 
 13-75 
 
 + 7 
 
 6 
 
CHAPTER IV: W ANDROMEDA. 
 
 57 
 
 too 
 
 DAYS 
 
 ZOO 3OO 4OO 
 
 500 
 
 Max.. 3/6 d 
 Min. m 
 M-m* 
 
 u 
 Q 
 
 I" 
 
 FIG. 12. MEAN LIGHT-CURVE OF W ANDROMEDA. 
 
CHAPTER V. 
 
 4315 R COM^E. 
 R. A. nh sgm 8.45; Dec. + 19 20' 19" (1900). 
 
 Disco veied by Schonfeld in 1856, this might almost be called a historic 
 star, but the published observations were so fragmentary in character that more 
 work was needed. The period was found to be only a few days less than a year, 
 and the maximum so near conjunction with the sun that cpmparisons were un- 
 certain in the twilight, while the beginning of the descending branch of the light 
 curve was lost in the daylight, and it appears that no one had followed it in the 
 morning sky, or continued observations through the minimum. The present 
 observations, when combined into the mean curve, figure 15, cover the entire 
 period, and seem to show that the time of maximum is about 20 days later than that 
 found from evening observations alone. The maxima numbered 40, 41, 42, 44, 
 and 48 are well covered with observations on both branches of the curve, but 
 the twilight renders it difficult to fix the exact magnitude at maximum; it can 
 only be stated as about 8.5, with the evidence insufficient to say whether it changes 
 from one maximum to another. The minima, on the contrary, can be well fol- 
 lowed, the three best observed, numbers 44, 46, and 49, giving a magnitude a 
 few tenths brighter than 14. 
 
 The faint stars with the Greek letters, z, and the variable were connected 
 with the bright star F (B. D. + 19 2526) in February and March, 1900, with the 
 micrometer on the 4o-inch. The place of the variable given above results from 
 the Berlin A. G. Catalogue position of the star F. 
 
 431.5 R COMM. 
 TABLE 33. STANDARD MAGNITUDE STARS. 
 
 Star. 
 
 B. D. No. 
 
 1900. 
 
 Color 
 P. DM. 
 
 Magnitude. 
 
 Residuals. 
 
 R. A. 
 
 Dec. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nights 
 inter 
 se. 
 
 H.C.O. 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 A 
 B 
 F 
 
 
 
 + 18 2539 
 + 18 2546 
 + 19 2526 
 
 Mean . . . 
 
 h m s 
 n 49 oo 
 " 52 35 
 it 58 57 
 
 / 
 
 + 18 43.4 
 + 18 01.6 
 + 19 23.1 
 
 WG 
 GW 
 G- 
 
 7.76 
 6.91 
 
 7.64 
 
 8.16 
 
 7.04 
 
 8.02 
 
 7.89 
 6.81 
 7.62 
 
 8.19 
 7.11 
 7.92 
 
 + 13 
 10 
 
 2 
 
 + 3 
 + 7 
 
 10 
 
 6 
 7 
 4 
 
 7-44 
 
 7-74 
 
 7-44 
 
 7-74 
 
 8 
 
 7 
 
 6 
 
 
 
 
 
6o 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 34. 4315 R COM^E. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 i855. 
 
 Star. 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 
 
 
 k m s 
 
 O ' 
 
 
 o 
 
 
 h m s 
 
 / 
 
 V 
 
 + 19 2522 
 
 9i 
 
 ii 54 2 
 
 + 19 59-i 
 
 W 
 
 + 19 2525 
 
 9-i 
 
 ii 55 IS 
 
 + 19 38.3 
 
 a 
 
 + 20 2670 
 
 8.6 
 
 " 54 5 8 
 
 + 20 5.5 
 
 P 
 
 + 20 2676 
 
 8.4 
 
 ii 56 25 
 
 + 20 I I . 8 
 
 R 
 
 + 19 2524 
 
 8.8 
 
 ii 55 9 
 
 + 19 20.4 
 
 H 
 
 + 20 2683 
 
 7.8 
 
 ii 59 59 
 
 + 20 IO. 1 
 
 TABLE 35. COMPARISON STARS FOR R COMJE. 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 p. 
 
 H. 
 
 P. 
 
 
 H 
 
 s 
 
 '/ 
 
 
 
 
 
 
 V 
 
 -2390 
 
 -168.8 
 
 + '454 
 
 
 9-77 
 
 10.07 
 
 
 
 a 
 
 -I58 9 
 
 -112.3 
 
 + 1772 
 
 40.9 
 
 9.09 
 
 9-39 
 
 
 
 R 
 
 -H54 
 
 102.4 
 
 900 
 
 39-o 
 
 9 15 
 
 9-45 
 
 
 
 lU 
 
 -1328 
 
 - 93-9 
 
 + 289 
 
 32.6 
 
 10. 14 
 
 10.44 
 
 
 
 d 
 
 - 453 
 
 32.0 
 
 - 329 
 
 25-4 
 
 10.67 
 
 10.97 
 
 
 
 b 
 
 - 408 
 
 - 28.8 
 
 - 658 
 
 17.1 
 
 12.29 
 
 12-59 
 
 
 
 i 
 
 - 404 
 
 - 28.5 
 
 + 735 
 
 26.4 
 
 10.57 
 
 10.87 
 
 
 
 c 
 
 - 336 
 
 - 23.7 
 
 - 869 
 
 18.6 
 
 12.43 
 
 12.73 
 
 
 
 z 
 
 - 379 
 
 - 26.8 
 
 + 124 
 
 "3 
 
 12.83 
 
 I3-I3 
 
 
 
 P 
 
 - 359 
 
 - 25.4 
 
 + 2160 
 
 44.2 
 
 
 
 '8^57 
 
 8^87 
 
 u 
 
 - 289 
 
 20.4 
 
 609 
 
 
 12. 8l 
 
 13.11 
 
 
 
 s 
 
 - 281 
 
 - 19.9 
 
 - 34 
 
 o 
 
 14.70 
 
 15.00 
 
 
 
 
 a 
 
 263 
 
 - 18.6 
 
 + 7i 
 
 3-0 
 
 14.08 
 
 I4-38 
 
 
 
 ft 
 
 - 259 
 
 - 18.3 
 
 + 226 
 
 4.0 
 
 14.08 
 
 14-38 
 
 
 
 F 
 
 - 199 
 
 - 14.1 
 
 + 13 
 
 52-9 
 
 7.62 
 
 7-92 
 
 
 
 f 
 
 - 138 
 
 - 9-7 
 
 + 273 
 
 9.0 
 
 13 19 
 
 13-49 
 
 
 
 7 
 
 - 136 
 
 - 9.6 
 
 + 194 
 
 4.0 
 
 14.17 
 
 H-47 
 
 
 
 e 
 
 + 327 
 
 + 23.1 
 
 + 171 
 
 21.3 
 
 
 
 "-47 
 
 iJ-77 
 
 e' 
 
 + 352 
 
 + 24.9 
 
 + 185 
 
 16.3 
 
 
 
 12. 16 
 
 12.46 
 
 H 
 
 
 + 190 
 
 + 2058 
 
 49-2 
 
 
 
 7.98 
 
 8.28 
 
 TABLE 36. 4315 R COM^E. PHOTOMETER MEASURES OP COMPARISON STARS. 
 
 1904 July 4. 6-INCH. Fair. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 /; m 
 
 
 
 
 
 
 
 
 
 
 16 14 
 
 
 v 
 
 26.8 26.8 27.9 
 
 27.17 
 
 27.84 
 
 2-44 
 
 9-59 
 
 9-89 
 
 
 
 R 
 
 27.9 28.6 28.7 
 
 28.40 
 
 27.60 
 
 2.41 
 
 9-56 
 
 9.86 
 
 
 59 
 
 a 
 
 25.4 24.8 24.9 
 
 25-03 
 
 23-65 
 
 2.01 
 
 9. 16 
 
 9.46 
 
 
 
 U 
 
 27. 2 27. I 28.2 
 
 27.50 
 
 27. 12 
 
 2.36 
 
 9-5i 
 
 9.81 
 
 
 60- 
 
 Da, 
 
 14.0 13.9 13.8 
 
 13.90 
 
 14.27 
 
 0.83 
 
 7.98 
 
 8.28 
 
 
 
 lU 
 
 31.4 32.4 31.9 
 
 31.90 
 
 32-57 
 
 3-00 
 
 io. 15 
 
 10.45 
 
 
 
 F 
 
 10.9 10.4 IO.7 
 
 10.67 
 
 II . 19 
 
 0.42 
 
 7-57 
 
 7-87 
 
 
 
 Be, 
 
 9.8 io.i ii. i 
 
 10.33 
 
 10.98 
 
 0.38 
 
 7-53 
 
 7-83 
 
 
 63 
 
 A 
 
 I4.I 14.7 14.3 
 
 14-37 
 
 14.29 
 
 0.83 
 
 7-98 
 
 8.28 
 
 
 
 A 
 
 14.2 14. O 144 
 
 H2O 
 
 
 
 
 
 
 63 + 
 
 
 11.9 ii. i ii 9 
 
 ii .6^ 
 
 
 
 
 
 
 62- 
 
 F 
 
 12. O II .2 II.9 
 
 ii .70 
 
 
 
 
 
 
 62 + 
 
 iV 
 
 7-1.8 12 O 11 O 
 
 ** 2"* 
 
 
 
 
 
 
 63 
 
 D al 
 
 15.0 14.2 14 7 
 
 14. 6^ 
 
 
 
 
 
 
 63 
 
 U 
 
 26 . 4 26 9 26 9 
 
 26 73 
 
 
 
 
 
 
 63 
 
 a 
 
 22.2 22-3 22 3 
 
 22. 27 
 
 
 
 
 
 
 63 
 
 R 
 
 26.8 26.7 26 9 
 
 26.80 
 
 
 
 
 
 16 40 
 
 64 
 
 V 
 
 27.8 29.4 28.3 
 
 28.50 
 
 
 
 
 
 
 
 
 
STELLAR PHOTOMETRY. 
 
 N 
 om 
 
 PLATE 5. 
 
 x 
 
 o 
 
 10' 
 
 20' , 
 
 Scale, i mni = I3".6. 
 
 4315 R 
 R. A.'nh 5gm 35.4. Dec. +'19 20' 19", 1900. 
 
 1905 April 2$. ; 
 
CHAPTER V. R 
 
 61 
 
 TABLE 36. 4315 R COM,B. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1904 July 9. 6-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 
 rtean Scale Readings. 
 
 
 Magnitude. 
 
 Scale Readings. 
 
 tfean of 3. 
 
 tfean of 6. 
 
 
 H. 
 
 P. 
 
 8.09 
 
 7-97 
 10.31 
 9-58 
 
 10.35 
 7.92 
 
 9 59 
 9.28 
 9.96 
 8.00 
 
 h m 
 15 54 
 
 16 18 
 
 57 
 57 
 56 
 
 57- 
 
 57- 
 
 57 
 58- 
 58 
 
 58 
 58 
 59 
 60 
 60- 
 62- 
 62 
 
 A 
 Bat 
 tfo. 
 R 
 W 
 F 
 
 V 
 
 a 
 U 
 DJI 
 
 Dar 
 
 U 
 a 
 F 
 W 
 R 
 Bai 
 A 
 
 J3-7 '4-4 14-1 
 13.2 13. i 13.1 
 33-3 33-5 34-0 
 27.8 27.2 28.0 
 35-i 35-o 34.9 
 14.1 13.5 13.3 
 27.3 28.2 27.7 
 24.5 24.9 25.1 
 31.4 31.9 31.2 
 14.0 14.3 14.0 
 14.0 14.5 14.8 
 
 29-9 3 3 30 7 
 24.3 24.8 25.0 
 12.7 14.8 13.9 
 
 33- 2 33-4 34-o 
 26.8 28.2 27.8 
 14.9 14.9 14.9 
 15.6 15.7 16.0 
 
 14.07 
 
 13-13 
 33 60 
 27.67 
 35-oo 
 13 63 
 27-73 
 24.83 
 3I-50 
 14. 10 
 14-43 
 30 30 
 24.70 
 13.80 
 
 33-53 
 27.60 
 14.90 
 15-73 
 
 14.90 
 14.02 
 
 0.92 
 0.80 
 
 3-'4 
 2.41 
 
 3-i8 
 0.75 
 2.42 
 
 2. II 
 
 2-79 
 0.83 
 
 7-79 
 7.67 
 
 IO.OI 
 
 9.28 
 10.05 
 7.62 
 
 9-29 
 8.98 
 9.66 
 7.70 
 
 27-64 
 34-27 
 J3-72 
 
 24-77 
 30.90 
 14.27 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 January 13. Good. 
 
 12 24 
 
 13 5 
 
 
 D 
 U 
 a 
 lU 
 
 F 
 d 
 R 
 B 
 A 
 A 
 B 
 R 
 d 
 F 
 lU 
 a 
 U 
 D 
 
 9.1 9.2 10.0 
 31.3 32.1 31.7 
 28. i 28.7 29.5 
 36.8 36.1 36.7 
 15.7 16.1 15.6 
 48.2 47.2 47.9 
 
 30.3 30.3 30.3 
 8.9 8.8 8.4 
 17.5 18. i 18. i 
 17.7 17.7 18.1 
 8.8 9.1 8.8 
 28.7 29.7 29.4 
 48.7 48.6 48.8 
 17. i 16. i 17.0 
 36.3 37-7 37-1 
 29-2 30-3 30-6 
 33-8 34-3 33-2 
 
 10.5 II.5 II .2 
 
 9-43 
 3I-70 
 28.77 
 36.53 
 15.80 
 
 47-77 
 30-30 
 8.70 
 17.90 
 
 17.83 
 8.90 
 29.27 
 48.70 
 i6.73 
 37-03 
 30.03 
 
 33-77 
 ii .07 
 
 10.25 
 
 32.74 
 29.40 
 36.78 
 16.26 
 48.24 
 29.78 
 8.80 
 17.86 
 
 0.32 
 
 3.02 
 2.62 
 
 3-55 
 
 I. 12 
 
 4-57 
 2.66 
 0.18 
 i-33 
 
 6.88 
 9-58 
 9. 18 
 
 IO. II 
 
 7.68 
 
 ii 13 
 
 9.22 
 6.74 
 7.89 
 
 7.18 
 9.88 
 9.48 
 10.41 
 7.98 
 u-43 
 9 52 
 7.04 
 8. 19 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 February 3. U-INCH. Good, -4F. 
 
 14 o 
 14 43 
 
 34 
 45 
 
 R 
 lU 
 c 
 b 
 d 
 Fa- 
 
 i 
 
 a 
 U 
 U 
 a 
 P 
 
 L 
 
 d 
 b 
 c 
 it' 
 R 
 
 13-0 13-5 14-0 
 23.6 24.6 23.9 
 46.5 46.5 46.3 
 42.8 44.2 43.0 
 31.0 31.9 31.3 
 8.4 8.7 8.4 
 26.7 27.0 26.9 
 
 15-5 '5-7 '5-4 
 21 .8 21.7 20.8 
 19-3 '9-9 20.2 
 13.8 13.9 14.4 
 11.3 i i . 8 i i . 8 
 27.7 29.4 28.6 
 8.9 9-9 8.3 
 27.8 28.2 28.9 
 
 43-1 43-9 42-3 
 44.0 44.6 43.8 
 25.0 25.2 24.8 
 17.0 16. i 17.1 
 
 I3-50 
 24-03 
 46.43 
 43-33 
 31.40 
 8.50 
 26.87 
 15 53 
 21-43 
 19.80 
 H 03 
 ii .63 
 28 . 57 
 9.03 
 28.03 
 43-23 
 44-'3 
 25.00 
 
 i6.73 
 
 15.12 
 
 24-52 
 45.28 
 43.28 
 29.72 
 8.76 
 27.72 
 14.78 
 20.62 
 
 1.07 
 2.16 
 4-36 
 4-13 
 2.62 
 0.31 
 
 2-43 
 i .02 
 
 '77 
 
 9. 10 
 10. 19 
 12-39 
 
 12. 16 
 
 10.65 
 
 8-34 
 10.46 
 9 05 
 9.80 
 
 9.40 
 10.49 
 12.60 
 12.46 
 
 10-95 
 8.64 
 10.76 
 9-35 
 
 IO. IO 
 
 
 
 
 
 0.62 
 
 
 8.65 
 
 8-95 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 36. 4315 R COM.B. PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1905 February 27. 12-INCH. Good, a little unsteady. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings 
 
 C. 
 
 Magnitude. 
 
 Mean of 3 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 8 25 
 
 8 50 
 
 O 
 
 R 
 
 lU 
 d 
 c 
 l> 
 F , 
 / 
 a 
 
 V 
 
 u 
 
 a 
 
 F a , 
 6 
 c 
 d 
 lU 
 R 
 
 18.3 19.0 19. i 
 27-7 28.3 27.5 
 33-4 33-6 32.9 
 48.9 47.8 48.7 
 45.0 46.7 46.2 
 
 12.2 12.4 12.3 
 32.1 32.4 33.2 
 
 15.6 16.9 16.0 
 
 22. O 22.8 23.0 
 23.0 22.6 23.1 
 16.7 16.9 I7.O 
 
 31-0 33-2 32-1 
 12.8 13.3 12.3 
 
 47.8 47.6 46.9 
 
 49 . o 48 . 8 49 . i 
 32.0 32.0 32.1 
 26.0 27. i 26.3 
 18.5 18.7 18.1 
 
 18.80 
 27-83 
 33-30 
 
 48.47 
 
 45-97 
 12.30 
 
 32-57 
 16. 17 
 22.60 
 22.90 
 16.87 
 32.10 
 
 1 2. So 
 
 47-43 
 48.97 
 32-03 
 26.47 
 18.43 
 
 18.62 
 
 27-15 
 32.66 
 48.72 
 46.70 
 '2.55 
 32.34 
 16.54 
 22.75 
 
 1-55 
 2.38 
 
 2-93 
 4.68 
 4-50 
 0-75 
 2.89 
 1.26 
 
 2.OO 
 
 9-29 
 
 IO. 12 
 
 10.67 
 12.42 
 12.24 
 8.49 
 10.63 
 9.00 
 9-74 
 
 9-59 
 10.42 
 10.97 
 12.72 
 
 12.54 
 8.79 
 10.93 
 9 30 
 10.04 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 March 3. Good. 
 
 9 45 
 10 24 
 
 4i 
 
 R 
 lU 
 c 
 b 
 d 
 Fa, 
 
 a 
 U 
 U 
 a 
 t 
 F , 
 d 
 b 
 c 
 lU 
 R 
 
 '3-7 13-4 13-4 
 23.3 23.0 22.8 
 46 . 9 46 . i 45 . 8 
 45-5 45-o 45-6 
 29.4 30.0 29.8 
 9.7 8.9 8.9 
 29.5 28.8 29.2 
 15 9 16-3 15-9 
 
 2O. O 21. I 2O. I 
 
 20 . 5 21.2 20 . 7 
 16.0 16.8 16.6 
 31.0 29.9 31.0 
 
 IO.I 8.9 IO.I 
 
 31.0 31.8 31.1 
 
 47-7 48-4 47-3 
 47-2 46.7 47-7 
 25.0 26.2 25.7 
 16.9 17.3 16.9 
 
 I3-50 
 23-03 
 46.27 
 45-37 
 29.73 
 9.17 
 
 29-17 
 16.03 
 20.73 
 20.80 
 16.47 
 30.63 
 9.70 
 31-30 
 47.80 
 47-20 
 25-63 
 17 03 
 
 15.26 
 24-33 
 46.74 
 46.58 
 
 30.52 
 9-44 
 29.90 
 16.25 
 20.76 
 
 I .09 
 
 2.14 
 4-50 
 
 4-49 
 
 2.7! 
 0-37 
 2.6 5 
 1.23 
 1-79 
 
 9.07 
 
 IO. 12 
 12.48 
 12.47 
 IO.69 
 
 8-35 
 10.63 
 9.21 
 9-77 
 
 9-37 
 10.43 
 12.78 
 12.77 
 10.99 
 8.65 
 10.93 
 
 9-51 
 10.07 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 March 5. 4O-INCH. Quite good. 
 
 '5 o 
 15 30 
 
 
 e 
 b 
 d 
 1 
 
 a 
 2 
 
 
 
 e 
 
 V 
 
 V 
 
 ) 
 
 V 
 
 y 
 < 
 3 
 X 
 a 
 I 
 
 d 
 b 
 c 
 u 
 
 26.5 27.7 25.8 
 25-7 26.4 26.3 
 16.3 17.2 16. i 
 52-8 54.3 53.0 
 48.5 47.7 48.6 
 34-8 34-2 34.0 
 42.1 43.3 43.2 
 
 36.7 36.3 37-2 
 48.3 49.0 47.8 
 44.0 44.0 44.6 
 15.8 16.2 16.5 
 15.0 16.2 16.3 
 43-' 43-0 44.0 
 46.2 44.8 45.7 
 37.2 38.6 38.1 
 44.1 45.2 46.1 
 32-2 33-8 33-3 
 45.1 46.0 45.8 
 52.0 51.7 51.3 
 15.5 16.9 16.8 
 28.1 28.1 28.7 
 26.5 26.7 26.6 
 33 9 34-7 34-o 
 
 26.67 
 26.13 
 16.53 
 53-37 
 
 48.27 
 
 34-33 
 
 42-87 
 
 36.73 
 48-37 
 44-20 
 16. 17 
 15-83 
 43-37 
 45-57 
 37-97 
 45-13 
 33-10 
 45-63 
 51-63 
 16.40 
 28.30 
 26.60 
 34.20 
 
 26.64 
 27.22 
 16.46 
 52 50 
 46.95 
 33-72 
 44.00 
 37-85 
 46.47 
 
 43-78 
 16.00 
 
 2-35 
 2.38 
 1.25 
 5-03 
 4-47 
 3-05 
 4.22 
 
 3-53 
 4.46 
 4.18 
 1.19 
 
 12.05 
 12.08 
 10.95 
 
 14-73 
 14.17 
 
 12-75 
 
 '3 92 
 13-23 
 14. 16 
 13-88 
 10.89 
 
 12-35 
 12.38 
 11.25 
 15-03 
 '4-47 
 13-05 
 14.22 
 
 13.53 
 14.46 
 14.18 
 ii. 19 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3 ii 
 
 
 12. 8l 
 
 13-11 
 
CHAPTER V. R COM^E. 
 
 TABLE 36. 4315 R COM.E. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1905 April i. 40-INCH F a j r to good, settings good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 8 56 
 
 Q 27 
 
 
 
 c 
 b 
 u 
 d 
 
 s 
 
 a 
 
 Z 
 V 
 
 y 
 
 c 
 
 
 J3 
 c 
 V 
 Tl 
 2 
 a 
 1 
 d 
 U 
 
 b 
 c 
 
 26.4 27.2 26.3 
 23.8 24.1 24.7 
 31.2 32.3 31.4 
 14.1 12.4 13.2 
 49.0 51.2 51.3 
 42.3 43-8 43.3 
 34-5 33-0 33 2 
 38.8 41 . i 40.0 
 45.7 44.1 44.6 
 36-3 36 4 36-9 
 45-5 46-4 45-7 
 10.0 12.6 11.7 
 11.4 II .1 13.1 
 44.0 45.1 44.8 
 
 35-o 35-9 35-7 
 45.2 47.0 46.0 
 39.2 37.8 38.8 
 32.0 32.4 33.4 
 40.8 38.1 38.9 
 
 43-9 48-3 44-5 
 14.2 15.0 14.2 
 29.3 31.0 31.0 
 18.8 23.0 22.1 
 
 23-7 22.9 23.1 
 
 26.63 
 24.20 
 31-63 
 13-23 
 5 50 
 43-13 
 33-57 
 39-97 
 44.80 
 
 36.53 
 
 45-87 
 "43 
 11.87 
 44.63 
 
 35-53 
 46.07 
 38.60 
 32.60 
 39-2? 
 45-57 
 14-47 
 30-43 
 21.30 
 
 23-23 
 
 24.98 
 22.75 
 31-03 
 13-85 
 48.04 
 41.20 
 33-o8 
 39.28 
 
 45-44 
 36-03 
 45-25 
 11.65 
 
 2. 2O 
 2.OO 
 2. 7 6 
 0.89 
 4 .62 
 
 3-91 
 2.98 
 3-70 
 
 4-37 
 3-32 
 4.36 
 0.62 
 
 12.26 
 12.06 
 12.82 
 
 10.95 
 14.68 
 
 13-97 
 13.04 
 13-76 
 14-43 
 13-38 
 14.42 
 10.68 
 
 12.56 
 12.36 
 13.12 
 11.25 
 14.98 
 14.27 
 
 13-34 
 14.06 
 
 14-73 
 13-68 
 14.72 
 10.98 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 April 4. Good. 
 
 14 26 
 15 02 
 
 45 
 
 c 
 
 b 
 
 u 
 
 d 
 
 i 
 
 a 
 Z 
 V 
 
 1 
 
 c 
 fi 
 f 
 
 (3 
 e 
 V 
 11 
 Z 
 a 
 i 
 
 d 
 u 
 b 
 c 
 
 32.2 31.5 31.9 
 31.9 32.1 31.9 
 
 38-1 37 7 36.7 
 16.2 17.3 16.8 
 
 54-0 53-7 54-3 
 47-5 48.9 48.3 
 35-7 36-1 35-3 
 40.7 40.4 40.9 
 46.1 47.3 45.8 
 
 37-3 38.6 38-7 
 47.0 47.8 44.4 
 16.0 15.2 15.9 
 15.8 16.1 15.7 
 45.1 44.8 46.9 
 37-o 37-8 36.7 
 44.6 47.5 46.3 
 42-9 42.7 42-1 
 35-0 34.9 35.0 
 47-7 47-4 48-4 
 55-2 57-o 55-o 
 18.2 17.3 17.5 
 34.0 35.0 36.2 
 30.0 30.7 29.8 
 3-7 3i-7 3' i 
 
 31-87 
 31.97 
 37-50 
 '6-73 
 54.00 
 48-23 
 35-70 
 40.67 
 46.40 
 38.20 
 46.33 
 15-70 
 15-87 
 45.60 
 
 37.17 
 46.07 
 42-57 
 34-97 
 47-83 
 55-73 
 17.67 
 35-07 
 30.17 
 3i.i7 
 
 3I-52 
 31-07 
 36.28 
 17.20 
 54.86 
 48.03 
 
 35-34 
 41 .62 
 46.24 
 37-68 
 45-96 
 I5-78 
 
 2.81 
 2.76 
 3-34 
 1-35 
 
 5-21 
 
 4.62 
 3.22 
 3-95 
 4-45 
 3-50 
 4.42 
 1.16 
 
 12.28 
 12.23 
 12.81 
 10.82 
 14.68 
 14.09 
 12.69 
 13-42 
 13-92 
 12.97 
 
 13-89 
 10.63 
 
 12.58 
 12.53 
 13." 
 
 II. 12 
 I4. 9 8 
 
 H 39 
 12.99 
 
 13.72 
 
 14.22 
 
 13-27 
 14-19 
 10.93 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
64 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 37. 4315 R COM*. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 1904 July 4. ic 
 
 (04 July 9. 1905 January 12. 
 
 Star. Obs. Mag. J Mag. Ob: 
 
 >. Mag. J Mag. Obs. Mag. J Mag. 
 
 H. P. H. P. H. 
 
 P. H. P. H. P. H. P. 
 
 A.... 0.83 7.98 8.28 + .22 + . 12 0.92 7.7 
 
 B. . . . 0.37 6.78 7.08 .13 +.04 0.05 6.9 
 F.... 0.42 7.57 7. 87-. 07-. 15 0.75 7.6 
 
 9 8. 09+. 03-. 07 1.33 7.89 8.19 -f .13 + .03 
 2 7.22 + .01 + . 18 0.18 6.74 7.04 .17 .00 
 
 2 7.92 .02 .10 I. I 2 7.68 7.98 + .04 .04 
 
 Means.. 0.29 7.44 7.74 .14 .10 0.57 7.4 
 M 7.15 7.45 6.8 
 
 4 7-74-2-i2 0.88 7.44 7.74.n.02 
 7 7.17 6.56 6.86 
 
 12-INCH. 
 
 40-INCH. 
 
 C. 
 
 Mae. 
 
 c 
 
 St L Mae. 
 
 ' Feb. 3. Feb. 27. Mar. 3. 
 
 12-inch. Mar 5 Apr t Apr 4 
 
 a 9.111 02 i 26 123 
 
 
 R 9-35 i o? i 55 i 09 
 
 
 77 . Q . S8 1.77 2 OO I 7Q 
 
 
 i 7 10.10 2.16 2. 38 214 
 
 
 
 
 Mean C .... i 51 i 80 i 56 
 
 
 Mean Mag. 9.54 9.54 9.54 9.54 
 
 M 8.O^ 7 74. 7 08 
 
 Mean Mag.. 1 1 . 49 1 1 . 49 1 1 . 49 1 1 . 49 
 
 
 
 MASK 
 IS 14 13 12 
 
 ITUDE 
 // 10 9 tf 7 
 
 ______ .__.._,.,___. 
 
 so :::::: 
 ::::::::::::::::: 4315 R COMAE 
 
 40 
 
 - + -H 
 -__..__ r EpI--. -. 
 
 - 5 E ' 
 
 ::::::::::::::::.:i::::::::: ::::::::::: 
 
 1U -''- 
 
 1 _ 
 
 30 
 
 v> - 
 o. 
 ui ; 
 
 ft i:::i::::i:i::::::::::;;:ii;;::iii;;ii! 
 M:::::::i::::::::::;::i:i::::i:i::ii!i:i 
 - ! i : I : : ; i I : 
 
 , it 
 
 _ r 3py. - - - 
 
 --^,ff- --- 
 :::!|:::::::::::::j::::|:::::::::::::::: 
 
 10 jjjfflf | | | | | | | | | | | | | | | | 
 
 ::::::::!!:;::::::::::::::::::::::::::: 
 
 :&*::: c - ::: 
 ::J ii::::::::E:^EEE:::EE:E::EE:E:Ei; 
 
 
 
 
 FIG. 13. MAGNITUDE-CURVE FOR R COM*. 
 
CHAPTER V. R COM^E. 
 
 TABLE 38. 4315 R COHLB. MEAN MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 July 4. 
 
 July 9. 
 
 January 12. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 4 Mag. 
 
 A 
 
 7.98 
 6.78 
 
 7-57 
 
 + 0.09 
 -0.03 
 0.05 
 
 7-79 
 6.92 
 7.62 
 
 o. 10 
 
 + O. II 
 
 o.oo 
 
 7.89 
 
 6-74 
 7.68 
 
 o.oo 
 0.07 
 + 0.06 
 
 7.89 
 6.81 
 7.62 
 
 8.19 
 7.11 
 7-92 
 
 0.06 
 0.07 
 0.04 
 
 B . . 
 
 F 
 
 Mean , . . 
 
 7-44 
 
 7-74 
 
 0.06 
 
 a ... 
 
 9. 16 
 9-56 
 9-5i 
 10.15 
 
 + 0.05 
 
 + O.2I 
 O.O7 
 + 0.05 
 
 8.98 
 9.28 
 9.66 
 10.05 
 
 -0.13 
 
 0.07 
 +0.08 
 0.05 
 
 9.18 
 9.22 
 9-58 
 
 IO. II 
 
 + 0.07 
 
 -0.13 
 
 o.oo 
 
 + O.OI 
 
 9.11 
 9-35 
 9-58 
 
 IO. IO 
 
 9.41 
 
 9-65 
 9.88 
 10.40 
 
 0.08 
 0.14 
 0.05 
 0.04 
 
 R 
 
 u 
 
 \u 
 
 Mean 
 
 9-54 
 
 9.84 
 
 0.08 
 
 
 
 
 
 
 
 
 12-INCH. 
 
 Star. 
 
 February 3. 
 
 February 27. 
 
 March 3. 
 
 Mean. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 
 9-05 
 9. 10 
 9.80 
 10. 19 
 
 0.04 
 -0.05 
 + 0.03 
 + 0.05 
 
 9.00 
 9-29 
 9-74 
 
 IO. 12 
 
 0.09 
 + o. 14 
 -0.03 
 
 O.O2 
 
 9.21 
 9.07 
 9-77 
 
 10. 12 
 
 + 0.12 
 -0.08 
 O.OO 
 O.O2 
 
 9.09 
 9-15 
 9-77 
 10. 14 
 
 9-39 
 
 9-45 
 10.07 
 
 10-44 
 
 0.08 
 0.09 
 0.02 
 0.03 
 
 R . 
 
 u 
 
 iU 
 
 Mean 
 
 9-54 
 
 9.84 
 
 0.06 
 
 12. l6 
 
 12.39 
 10.65 
 
 10.46 
 
 -0.13 
 0.04 
 
 O.O2 
 
 O. II 
 
 12.24 
 12.42 
 10.67 
 10.63 
 
 0.05 
 O.OI 
 
 o.oo 
 4-0.06 
 
 12-47 
 12.48 
 IO.69 
 10.63 
 
 4-0.18 
 + 0.05 
 + O.O2 
 + O.O6 
 
 6 
 
 12 . 29 
 
 12-43 
 IO.67 
 
 10-57 
 
 12.59 
 
 12-73 
 10.97 
 10.87 
 
 O. 12 
 
 0.03 
 0.01 
 
 0.08 
 
 c 
 
 d 
 
 / 
 
 
 ii 49 
 
 ii 79 
 
 0.06 
 
 
 
 
 
 
 
 
 40-INCH. 
 
 Star. 
 
 March 5. 
 
 April i. 
 
 April 6. 
 
 Mean. 
 
 Mag. 
 
 d Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 b 
 
 12.08 
 12.05 
 
 10.95 
 10.89 
 
 0.04 
 -0.15 
 + 0.04 
 +0.16 
 
 12.06 
 12.26 
 
 10-95 
 10.68 
 
 0.06 
 + 0.06 
 + 0.04 
 -0.05 
 
 12.23 
 12.28 
 10.82 
 10.63 
 
 + O.II 
 
 4-0.08 
 0.09 
 
 O. IO 
 
 12. 12 
 12. 2O 
 lO.gi 
 10-73 
 
 12.42 
 12.50 
 
 II .21 
 11.03 
 
 0.07 
 
 O. IO 
 
 0.06 
 
 O. IO 
 
 
 d 
 
 /.. 
 
 
 11.49 
 
 11.79 
 
 0.08 
 
 u 
 
 12.81 
 
 12.75 
 14.17 
 13 92 
 14. 16 
 14-73 
 I3-23 
 
 o.oo 
 0.08 
 + 0.09 
 o. 16 
 
 O.OI 
 
 -0.03 
 
 + 0.04 
 
 12.82 
 13-04 
 13 97 
 14.42 
 
 14-43 
 14.68 
 
 I3-38 
 
 -f-o.oi 
 
 + O.2I 
 O. II 
 
 +0.34 
 +0.26 
 
 O.O2 
 
 +0.19 
 
 12.81 
 12.69 
 14.09 
 13 89 
 13-92 
 14.68 
 12.97 
 
 o.oo 
 o. 14 
 
 + O.OI 
 
 o. 19 
 
 -0.25 
 
 O.O2 
 O.22 
 
 I2.8I 
 12.83 
 14.08 
 (14.08 
 (14.17 
 14.70 
 13 '9 
 
 13.11 
 I3.I3 
 14-38 
 H-38 
 14-47 
 15.00 
 
 13-49 
 
 o.oo 
 0.14 
 0.07 
 
 0.23) 
 0.17) 
 
 0.02 
 0.15 
 
 z 
 
 a 
 
 ft 
 
 
 i 
 
 c 
 
 
66 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 39. 4315 R COM.E. VISUAL OBSERVATIONS OF THE VARIABLE. 
 
 No. 
 
 Date. 
 
 u< 
 
 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S.T. 
 
 9 
 
 8 
 
 9 
 9 
 9 
 9 
 10 
 
 10 
 
 9 
 9 
 10 
 
 IO 
 IO 
 
 9 
 
 9 
 9 
 9 
 9 
 
 10 
 
 9 
 9 
 9 
 9 
 
 8 
 8 
 8 
 i? 
 18 
 
 18 
 9 
 9 
 9 
 9 
 
 IO 
 
 9 
 8 
 8 
 8 
 8 
 8 
 8 
 8 
 8 
 17 
 17 
 i? 
 17 
 
 IO 
 IO 
 
 9 
 9 
 
 Julian 
 " Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 i 
 
 2 
 
 3 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 10 
 ii 
 
 12 
 13 
 
 14 
 15 
 
 16 
 
 17 
 18 
 
 19 
 20 
 
 21 
 22 
 23 
 24 
 25 
 26 
 
 27 
 28 
 
 29 
 
 3 
 3' 
 32 
 33 
 34 
 35 
 36 
 37 
 38 
 39 
 40 
 
 4i 
 
 42 
 43 
 44 
 45 
 46 
 
 47 
 48 
 
 49 
 50 
 51 
 52 
 53 
 
 1894 
 Mar. 9 
 26 
 Apr. 7 
 
 22 
 
 May 4 
 10 
 ii 
 
 3i 
 June 6 
 18 
 
 20 
 24 
 
 3 
 July 6 
 
 23 
 
 1896 
 May 28 
 June 6 
 10 
 30 
 July 6 
 ii 
 
 24 
 Aug. 3 
 
 8 
 
 10 
 
 17 
 26 
 Nov. 1 2 
 
 Dec. 2 
 
 1897 
 Jan. 7 
 July 2 
 8 
 16 
 
 21 
 
 27 
 
 Aug. i 
 6 
 ii 
 13 
 19 
 20 
 
 24 
 27 
 29 
 Sept. 27 
 
 30 
 Oct. 8 
 
 25 
 
 1898 
 June 14 
 
 July 5 
 20 
 Aug. i 
 9 
 
 2410000+ 
 2897 
 2914.60 
 2926.61 
 2941 .64 
 2953-63 
 2959-63 
 2960.63 
 2980.67 
 2986.65 
 2998.63 
 3000.63 
 3004.67 
 3010.67 
 3016.65 
 3033-63 
 
 3708.63 
 3717-63 
 3721-63 
 374I.63 
 3747.67 
 3752.63 
 3765-63 
 3775.63 
 3780.63 
 3782.58 
 3789-58 
 3798.57 
 3876.96 
 
 3897.00 | 
 
 3933-00 
 4108.63 
 4114.63 
 4122.63 
 4127.63 
 4133-67 
 4138.61 
 4*43-58 
 4148.58 
 4150.58 
 4156.58 
 4J57-58 
 4i6i.57 
 4164-57 
 4166.57 
 
 4195-96 
 4198.96 
 4206 . 96 
 4223-96 
 
 4455.67 
 4476.67 
 4491-63 
 4503.61 
 4513.6 
 
 150? 
 150? 
 150? 
 
 150 
 
 150 
 40 
 150 
 
 150 
 
 150 
 
 40 
 
 150 
 40 
 
 150 
 
 150 
 150 
 150 
 
 40 
 
 80 
 40 
 
 40 
 
 ISO 
 
 40 
 
 150 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 
 150 
 40 
 40 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 12 
 12 
 12 
 12 
 12 
 
 
 
 
 <I2 
 <I2 
 <I2 
 <I2 
 <I2.3 
 
 poor 
 good 
 good 
 fine 
 fair 
 poor 
 good 
 good 
 good 
 fair 
 fair 
 fair 
 good 
 moon 
 fair 
 
 good 
 fair 
 fine 
 fair 
 good 
 poor 
 moon 
 fair 
 
 fair 
 fair 
 fair 
 good 
 
 good 
 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 poor 
 fair 
 good 
 fair 
 fair 
 good 
 poor 
 poor 
 good 
 good 
 
 fair 
 fair 
 
 poor 
 fair 
 
 o 
 
 H 
 18 
 
 24 
 3 
 47 
 
 2 
 I I 
 
 15 
 
 35 
 4' 
 46 
 59 
 69 
 74 
 76 
 
 83 
 92 
 170 
 
 191 
 
 227 
 42 
 48 
 56 
 61 
 67 
 72 
 77 
 82 
 84 
 90 
 9i 
 95 
 98 
 
 IOO 
 
 132 
 140 
 157 
 
 29 
 50 
 65 
 
 77 
 87 
 
 -0.74 
 
 o. 70 
 0.60 
 
 -0.43 
 
 O.2I 
 -0.72 
 
 -0.73 
 
 + 0.80 
 - + 0.48 
 -0.73 
 
 + o. 15 
 
 + 0.35 
 + 0.25 
 + 0.20 
 + O.22 
 
 + 0.24 
 
 + O.O2 
 
 + 0.28 
 + O.2O 
 
 -0-34 
 O.6o 
 0.42 
 -0.36 
 -0.58 
 
 -0.34 
 O.6O 
 -0.51 
 0.50 
 0.42 
 -0.49 
 0.50 
 -0.51 
 
 + 0.03 
 + 0.30 
 + 0.58 
 
 + 0.57 
 + 0.60 
 -0.03 
 I .O2 
 -0-45 
 
 TJ not seen limit < i2 M . . . 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 <I2.4 
 <I2. 3 
 
 12.26 
 <n.8 
 11.85 
 11.80 
 ii .61 
 ii .61 
 10.27 
 
 <I2.O 
 
 11.88 
 
 
 
 
 
 
 15.6 
 
 <i9 
 18.6 
 19.0 
 
 2O. 2 
 2O. 2 
 30-4 
 
 <I7 
 
 8.3 
 
 
 
 DC "VI 2b 
 
 18.6, 18.6 
 
 n-2c, Tii-2b, eyv 
 
 V2C, ei-2V 
 T12-y, 2T1 
 
 xi-2v, t)4/, f$e 
 ~v not seen limit 4< e . . . . 
 
 20. i, 18.6, 18.3 . . 
 20. 6, 19.8 
 21. i, 19.3 
 30.4, 30.4 
 
 v glimpsed 031?? 
 
 
 
 
 V not seen limit 3<Ce 
 
 
 <i8 
 17-3 
 21.3 
 37-5 
 36.0 
 
 36-3 
 37-8 
 39-8 
 40.4 
 26.4 
 
 21.6 
 
 13.8 
 
 21.8 
 
 28.1 
 
 35-2 
 37-8 
 39-4 
 43-8 
 46.2 
 46-3 
 45-9 
 46.4 
 45-8 
 46.4 
 46.6 
 46.8 
 <53 
 39-3 
 35-8 
 27.9 
 
 13-7 
 
 22.6 
 36.2 
 48.6 
 46.0 
 
 <n .9 
 
 12. OI 
 
 11.48 
 9.38 
 9.58 
 9.53 
 9.35 
 
 9. 10 
 
 9.03 
 10.79 
 
 II .42 
 
 12.50 
 II 40 
 
 10.58 
 9.68 
 9.36 
 9.12 
 
 8.61 
 8-33 
 8.32 
 8.37 
 8.31 
 8.38 
 8.31 
 8.30 
 8.28 
 <7-5 
 9.15 
 9.60 
 10.60 
 
 12.52 
 11.30 
 
 9-55 
 8.06 
 
 8-35 
 
 e$v limit i<v 
 
 
 ve . 
 
 
 Rl 2V . . . 
 
 
 RlV, TII-2 lU 
 
 Rv,vi lU 
 vo-jR, T12-T, iV, ayv, pyv. 
 vo-iR, P-^-afU, a\2Ti 
 vR, P3~ 41), via 
 vf, iiid, -vSe 
 
 d^V, T1I-2C 
 
 ofay 
 
 37-0, 34-1 
 39 o, 33.6 
 39-0, 35-1, 37-9, 39-2 
 39-5, 40.7, 39-4 
 39.0, 40.7, 41.4 . . 
 26.4, 26.4, 29.3 . . 
 21.4, 22.8 ) 
 
 IO 4. 
 
 6-8i), e*yv 
 Tie, dyi 
 
 T12d, ZT}/, lt/5Z) 
 
 RSV, 1)3-4 it/,/?3-4" 
 
 '4-3, 13 3 
 21.3, 22.4 
 27-4. 29.4, 27.6 . . 
 34.0, 36.1, 35.5 . . 
 
 ^7 c 18 I 
 
 viR, a2V 
 vdR, Po-iv, Ti2-yi 
 
 V2P 
 
 40.0, 38.9 
 
 45-0, 43-7, 43-4 
 
 F6v, T12P, HT,-$V 
 Fyj, tiiP, #3-41) 
 Ft,v, -viP, Hyv 
 F^v iiiP, H$v 
 
 46.9, 46.2, 45.7 . . 
 47-9, 45-2, 45-7 
 47-9, 45-2, 46-2 .. 
 47.9, 45.2, 45.2 . . 
 47-4, 46 7. 45-2 
 47.9, 46.2, 45.7 . . 
 47.9, 46.2, 46.2 . . 
 
 Fs-6i>, -V2-T,P, H$v 
 F$v, -V2P, H 3-4.11 
 FSTI, V2P, Hyi 
 
 P4-5-V, TiR 
 Ryv, 1)3 lU 
 
 39-7, 39 o 
 36.o, 35.6 
 28.6, 27.4, 27.4 .. 
 
 H-i. 13.3 
 
 22.8, 22.4 
 
 37-6, 34-9 
 44-9, 52.2 
 42.9, 49.2 
 
 C4-5D, 1>2Z 
 
 vi 2e, d?,v 
 1)5 ill, a6v 
 F&v, i)8P 
 
 FlOTl, V5P 
 
CHAPTER V. R 
 
 TABLE 39. 4315 R COMJB. VISUAL OBSBRVATIONS OP THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 i 
 t, 
 
 B, 
 
 < 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 
 C.S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 54 
 55 
 56 
 57 
 58 
 
 59 
 
 60 
 61 
 62 
 63 
 64 
 
 65 
 66 
 
 67 
 68 
 
 69 
 70 
 
 7i 
 72 
 73 
 + 73 
 74 
 75 
 76 
 77 
 78 
 79 
 80 
 81 
 82 
 
 83 
 
 84 
 85 
 
 86 
 
 8? 
 88 
 89 
 90 
 
 9i 
 92 
 
 93 
 
 94 
 95 
 96 
 
 97 
 98 
 
 1898 
 Aug. 19 
 
 27 
 Sept. 2 
 Nov. 14 
 Dec. 23 
 
 1899 
 Dec. 14 
 
 1900 
 Jan. 20 
 Feb. i 
 
 9 
 18 
 
 24 
 Mar. 2 
 
 21 
 
 22 
 
 Apr. 4 
 
 6 
 
 18 
 18 
 
 27 
 May 8 
 
 9 
 24 
 25 
 28 
 29 
 30 
 June 8 
 15 
 23 
 26 
 
 July 10 
 
 21 
 
 25 
 28 
 
 Aug. 6 
 
 13 
 '3 
 H 
 18 
 Oct. 25 
 
 1901 
 May 1 8 
 
 1902 
 Jan. 10 
 Feb. ii 
 
 22 
 
 Mar. 15 
 Apr. 12 
 
 9 
 
 8 
 8 
 
 17 
 18 
 
 18 
 
 13 
 18 
 16 
 13 
 II 
 
 1 1 
 ii 
 ii 
 
 13 
 
 H 
 9 
 
 10 
 
 8 
 ii 
 
 9 
 10 
 
 9 
 9 
 9 
 9 
 
 8 
 
 9 
 
 8 
 
 9 
 
 8 
 
 8 
 17 
 
 13 
 
 14 
 
 12 
 
 13 
 12 
 
 2410000+ 
 4521 .60 
 45 2 9-58 
 4535-57 
 4608 . 96 
 4648 . oo 
 
 5004.00 
 
 5040.79 
 553 oo 
 5060.92 
 5069.79 
 
 5073-71 
 
 5081 
 5100.71 
 
 5101 .68 
 
 5"4-79 
 
 5116.81 
 5128.63 
 5128.65 
 5I37-7 
 5148-7 
 5H9-7 
 5i64-7 
 5165.7 
 5168.7 
 5169-7 
 5170.58 
 5I79-69 
 5186.63 
 
 5I94-67 
 5196.63 
 
 5211-63 -< 
 5222.61 
 5226.63 -j 
 
 5229-58 \ 
 5238.60 -J 
 
 5245-58 
 5245-58 
 5246-58 
 
 5250- 58 { 
 
 5318.54 
 
 5523-77 
 
 5760.83 
 
 5792.75 
 5803 
 
 5824.79 
 5852-75 
 
 80 
 80 
 40 
 150 
 150 
 
 350 
 150 
 i?5 
 350 
 
 350 
 
 275 
 275 
 350 
 
 275 
 
 350 
 350 
 275 
 237 
 350 
 237 
 275 
 80 
 
 275 
 237 
 237 
 237 
 150 
 40 
 150 
 150 
 40 
 40 
 
 80 
 
 40 
 40 
 150 
 40 
 40 
 40 
 40 
 150 
 40 
 67 
 
 80 
 
 237 
 237 
 
 350 
 23? 
 
 12 
 
 6 
 6 
 6 
 6 
 
 6 
 
 40 
 6 
 
 12 
 4 
 
 40 
 
 12 
 12 
 40 
 12 
 
 40 
 40 
 12 
 40 
 40 
 40 
 12 
 12 
 12 
 40 
 40 
 40 
 
 6 
 6 
 6 
 6 
 6 
 6 
 
 12 
 
 3 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 12 
 
 12 
 
 40 
 40 
 
 24 
 40 
 40 
 
 PlTl, ilIO-12 lU, V6-^R . . 
 
 FIZTJ, P$-$v 
 
 42.2, 43.6, 46.5 
 40.9, 38.7 
 
 43-3 
 39 4 
 
 40.3 
 
 22.6 
 14.9 
 
 18.3 
 14-3 
 
 <i5 
 8.8 
 
 5-9 
 6.6 
 
 <8 
 
 <6. 3 
 4.0 
 
 3-5 
 
 7.0 
 8.8 
 <9.o 
 8.8 
 9-4 
 
 8.67 
 
 9-13 
 9.04 
 11.30 
 12.38 
 
 11.88 
 12.42 
 
 <I2-3 
 
 13,12 
 13-68 
 
 13-56 
 
 <i3-3 
 <I3- 6 
 13-95 
 14.05 
 
 13-50 
 13.22 
 
 ''IS- 
 IS 2 
 
 I3-I7 
 13-24 
 12.65 
 12.56 
 12.52 
 12.44 
 12.51 
 11.58 
 ii .40 
 11.19 
 
 II . IO 
 
 9.87 
 9-52 
 9.24 
 
 9 52 
 9-45 
 
 9.24 
 9-05 
 9.02 
 
 9-38 
 n. 18 
 
 12.85 
 
 12.80 
 13-42 
 
 fair 
 good 
 fair 
 good 
 fine 
 
 fair 
 good 
 
 fair 
 fair 
 
 fair 
 fair 
 good 
 
 good 
 
 fair 
 fair 
 poor 
 good 
 fair 
 poor 
 good 
 good 
 good 
 good 
 good 
 low 
 fair 
 good 
 fair 
 
 fair 
 fair 
 good 
 
 good 
 fair 
 
 95 
 103 
 109 
 182 
 
 222 
 
 218 
 
 254 
 
 274 
 28 3 
 
 287 
 
 315 
 328 
 
 330 
 342 
 
 2 
 
 3 
 18 
 
 19 
 
 22 
 23 
 
 24 
 
 33 
 40 
 48 
 50 
 
 65 
 76 
 80 
 
 83 
 92 
 
 -0.23 
 
 + 0-33 
 + 0.24 
 
 + O.22 
 + 0.24 
 
 -O.I? 
 
 O.2I 
 
 O OI 
 
 + 0.36 
 
 -0.18 
 
 + 0.25 
 
 + 0-35 
 -0.30 
 0.28 
 
 + 0.17 
 + 0.26 
 + 0.36 
 + 0.31 
 + 0.41 
 
 + 0.34 
 + 0.41 
 
 O. IO 
 
 o.oo 
 
 + O.2I 
 + 0.40 
 
 + 0.32 
 + 0.44 
 + 0.25 
 
 + 0.62 
 + 0.65 
 
 
 
 in 22, c^v, 631), cyv 
 
 12.8, 17.3, 14.1, 15.6 
 18.3, 18.3 
 
 eyv, vie 2 
 
 JJ7Z 
 
 v not seen, limit 2 < 6 .... 
 
 
 22311 ? not sure 
 
 
 251>, TJ2 3<x 
 
 6l <\ 5 . . 
 
 lzW>> T2-3a 
 ^0Ia 036, "yla 
 
 7-8, 5-5 | 
 
 v not seen, limit 3<Cz 
 
 
 v not seen, limit 4 5<z.. . . 
 
 
 
 
 I a, ft, / and , seen, limit y 
 ( v quite certainly glimpsed 
 tyv, 1147, zi-2f, ^4-57 
 T'3r, vi-2,, zSv 
 11 not held, . seen 
 
 
 
 6.0, 8.0 
 7-0, 10.5 
 
 Z2V, Vt, t'4y 
 22-31), VI, 
 
 photometer 
 
 9.3, 9.0, 8.0 
 8.8, 10. o 
 
 e*%-iav, T>i-2z, limit 2<z 
 
 1)22 ... . 
 
 
 12.8 
 
 13-3 
 13-7 
 14-3 
 13-8 
 
 
 641), vys 
 e a 8i>, 7132 
 V2Z, e*8v, T>T,Z 
 photometer 
 
 I3-I, 14-3 
 (8.3), 14-3 
 13-3. 14-3 
 
 
 
 21.8 
 
 23-4 
 24.0 
 
 33 6 
 36.3 
 37-8 
 
 36.6 
 36.0 
 
 dn) V2e fyv 1)6 86 . . . 
 
 23.4,23.4,23.4(24.1) 
 23-4, 28-3 
 32 A. . . ) 
 
 d2v, v(t-8e 
 v6~8d 
 
 113 i U, R&v 
 Ryv, t>4 1 1/ 
 Riv, 115 lU 
 
 RlTl, T}$lU 
 
 R2V, 113 it/ 
 photometer 
 
 35-6, 31.0 ) 
 36.0, 36.6 
 38.0, 37.6 \ 
 38.0, 37.6 1 
 37-o, 35-6 \ 
 
 112 3 lU 
 
 T.6 I . . . \ 
 
 Rw 
 
 36 o / 
 
 photometer 
 
 
 V2R, t>6-8 it/ 
 
 VI-2R 
 
 4' o, 39.6 
 
 40.3 
 
 40-5 
 
 37-6 
 23-4 
 
 H. 3 
 
 good 
 good 
 
 good 
 fair 
 
 fair 
 
 poor 
 fair 
 
 99 
 
 IOO 
 
 104 
 
 172 
 
 17 
 
 254 
 286 
 
 + 0.30 
 + 0.22 
 
 + 0.58 
 + 0.48 
 
 + 0.45 
 
 O.O2 
 + O. IO 
 
 v^ 5 iU 
 
 17 i . .1 
 
 Kiv 
 
 18 o ( 
 
 dm, vii 
 t>z near limit 
 
 24-4, 22.3 
 
 photometer 
 
 
 photometer 
 
 
 
 photograph 
 
 
 
 
 5.8, 9.0 7.0, 7.0. 
 
 6.6 
 
 13-57 
 13-48 
 
 fair 
 good 
 
 3i8 
 346 
 
 -0.13 
 + O.06 
 
 photometer 
 
 
 
 
68 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 39- 4315 R COM/E. VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 Aperture. 
 
 Comparison. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 99 
 
 100 
 IOI 
 IO2 
 103 
 104 
 
 105 
 106 
 
 107 
 1 08 
 109 
 
 I 1O 
 
 in 
 
 112 
 
 "3 
 114 
 
 5 
 116 
 
 H7 
 
 118 
 119 
 
 1 20 
 
 121 
 122 
 '23 
 124 
 
 125 
 126 
 127 
 128 
 
 129 
 
 130 
 131 
 
 1901 
 May 2 
 
 25 
 June 3 
 
 9 
 25 
 30 
 
 1903 
 Jan. 9 
 May 17 
 
 1904 
 Mar. 22 
 May 3 
 
 10 
 
 June 17 
 
 Jiy 4 
 
 9 
 
 Aug. 2 
 
 27 
 1905 
 
 Jan. 3 
 29 
 
 Feb. 27 
 Mar. 5 
 
 12 
 
 24 
 
 25 
 26 
 Apr. i 
 
 4 
 
 8 
 1 1 
 30 
 May 31 
 
 June 22 
 
 July 24 
 Aug. 9 
 
 13 
 
 M 
 
 10 
 
 9 
 
 10 
 
 9 
 
 16 
 9 
 
 13 
 10 
 
 7 
 ii 
 
 10 
 
 9 
 
 8 
 
 3 
 
 14 
 
 10 
 
 15 
 13 
 
 9 
 10 
 
 10 
 
 9 
 '4 
 
 9 
 15 
 
 10 
 
 9 
 9 
 
 9 
 
 8 
 
 2410000+ 
 5872.77 
 5895.83 
 5904.67 
 5910.63 
 5926.67 
 593' 63 
 
 6124.92 
 6252.63 
 
 6562.79 
 6604 . 67 
 66 1 1 .54 
 6649.71 
 6666.67 
 6671.63 
 6695 . 6 
 6720.58 
 
 6849.79 
 6875.83 
 6904 . 67 -j 
 
 6910.88 | 
 6917.77 
 
 6929.60 
 
 6930.67 
 6931.67 
 6937-63 
 6940.83! 
 
 6944.63 
 6947 96 
 6966 . 67 
 6997 63 
 
 7019.63 -^ 
 
 7051-63 
 7067.60 
 
 237 
 237 
 67 
 67 
 67 
 
 67 
 
 237 
 67 
 
 237 
 67 
 40 
 40 
 40 
 40 
 67 
 40 
 
 237 
 237 
 67 
 275 
 237 
 237 
 237 
 
 150 
 
 250 
 237 
 237 
 237 
 237 
 237 
 237 
 237 
 150 
 40 
 150 
 40 
 40 
 
 40 
 40 
 
 12 
 12 
 12 
 
 12 
 
 40 
 12 
 
 40 
 12 
 
 6 
 6 
 6 
 6 
 
 12 
 
 6 
 
 40 
 40 
 
 12 
 12 
 40 
 40 
 40 
 
 6 
 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 6 
 6 
 6 
 6 
 6 
 
 photometer 
 
 
 
 12.71 
 
 12. 14 
 11.49 
 11.03 
 
 9-43 
 8.97 
 
 13.28 
 <n.7 
 
 13-50 
 12.9 
 12.67 
 10.54 
 9-54 
 9.29 
 8.41 
 8.78 
 
 12. 29 
 13.00 
 <I2.9] 
 
 13.31} 
 13.90 
 
 13.59 
 
 <I2.9 
 
 13.45 
 (14.42) 
 13 76 
 
 13.43 
 13.20 
 
 13.48 
 
 12.92 
 11.50 
 
 9.90 
 
 8.90 
 9.18 
 
 good 
 fair 
 fine 
 fair 
 fair 
 good 
 
 fair 
 poor 
 
 fine 
 dull 
 good 
 fair 
 fair 
 good 
 good 
 good 
 
 good 
 good 
 
 good 
 
 good 
 good 
 
 fair 
 
 good 
 fair 
 fair 
 
 good 
 
 fair 
 low 
 good 
 fair 
 
 poor 
 
 good 
 fair 
 
 6 
 29 
 38 
 44 
 60 
 
 65 
 
 258 
 
 336 
 18 
 25 
 63 
 80 
 
 5 
 109 
 
 '34 
 
 263 
 289 
 
 3i8 
 
 3 2 4 
 33i 
 
 344 
 3S4 
 3St 
 
 358 
 i 
 
 12 
 2O 
 51 
 
 73 
 105 
 
 121 
 
 -0.17 
 
 + O.22 
 0.03 
 0.08 
 -0.36 
 O.DO 
 
 4-0.38 
 
 0. II 
 + 0.5 
 
 + 0.58 
 
 + 0.88 
 + 0.55 
 + 0.39 
 -0.39 
 0.40 
 
 0.70 
 -0.39 
 
 -0-39 
 
 + O.2I 
 0. 10 
 
 -0.03 
 
 + o. 17 
 +0.46 
 
 +0.05 
 
 + 0.60 
 0.50 
 + 0.72 
 + 0.90 
 
 +0.70 
 
 + O. 12 
 + 0.27 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 241", Vt(T>, v8y 
 TJ not seen, limit i M <rf. . . . 
 
 7.3, 9.0, 12.0 
 
 8.6 
 
 photometer 
 
 
 
 
 14.1, 16.5, 13.3 . . 
 12.5, 12.8 
 
 14.6 
 
 12.7 
 
 uyv, V1-2Z, z glimpsed. . . . 
 photometer 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 Pi 2V, a or R not seen . . . 
 
 
 42.7 
 15.3 
 
 IO.2 
 
 <n.3 
 
 8.3 
 
 4.3 
 
 6.5 
 <n 
 
 7-4 
 
 1)Z . . 
 
 
 Z1V, Tie 
 
 i) not seen, limit 2 
 
 10.3, 10. o 
 
 i) glimpsed ? 231?^ 
 
 
 
 4.5, 4.5, 4.0 ... I 
 
 photometer 
 
 3"y, v^y 
 
 6 -O. 7 .O . . 
 
 (ttand companion both seen, 
 -' z limit, about I2 M .6, v 
 (not seen. 
 251), ell), 1>4y 
 photometer 
 
 ) 
 
 > 
 
 6.3, 8.0, 8.0 
 
 photometer 
 
 
 
 ei7>, vyf 
 
 8 . o, 7 o . 
 
 7 1 
 
 photometer 
 
 
 <ow 7)6v 
 
 8.5 10 o 
 
 9.0 
 
 7-2 
 
 10.8 
 
 21 ,O 
 
 33-3 
 41.7 
 39-3 
 
 e2D 7)34? 
 
 7 -O, 7 5 
 
 v 5-67, 7>2<i, vz 
 d$v, Tie, 716=86 
 
 R2V, 11-lU 
 
 v^d 
 
 9.5, u. o, 11.3 
 21.4, 21.3, 24.1 .. 
 37-o, 32.6 ) 
 30 . 4 ... ) 
 
 Pyj, va, v6R 
 P67), am 
 
 41.2, 40.9, 45.0 . . 
 38.2, 39.9 
 
CHAPTER V. R 
 
 01 
 
 <0 
 
 Q 
 
 
 <00 
 
 ^ > 
 
 O 
 
 o 
 
 Q^ 
 if) W 
 
 6 9 
 
 y 5 * 
 
 FlG. 14. LIGHT-CURVB OF R 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 40. 4315 R COM^B. MEAN MAGNITUDES FROM 30 DAY GROUPS. 
 
 Group No .... 
 ] D 
 
 i 
 
 30 
 
 2 
 60 
 
 3 
 90 
 
 4 
 1 20 
 
 5 
 15 
 
 6 
 
 1 80 
 
 7 
 
 210 
 
 8 
 240 
 
 9 
 
 270 
 
 10 
 300 
 
 II 
 
 330 
 
 12 
 360 
 
 
 
 f 
 
 2986 \ 
 
 1 
 
 1 
 3706 ^ 
 
 1 
 4066 . 
 
 4426 . 
 4786 . 
 5146 
 5506 
 5866 
 6586 
 6946 
 Mean 
 
 t 
 M 
 
 JM 
 No. 
 
 t 
 M 
 JM 
 No 
 
 t 
 M 
 4M 
 
 No. 
 
 t 
 M 
 JM 
 No. 
 
 r i 
 
 JM 
 
 No. 
 
 [ M 
 
 I JM 
 [_ No. 
 
 r >: 
 
 JM 
 L No. 
 
 r ^ 
 
 1 JM 
 L No. 
 
 ( ' 
 
 1 JM 
 L No. 
 
 ( J 
 
 1 JM 
 L No. 
 
 .1 
 
 5 1 JM 
 L No. 
 
 H 
 11.87 
 0.62 
 
 4 
 
 ii 
 11.88 
 
 -0.73 
 i 
 
 29 
 12.52 
 
 + 0.57 
 i 
 
 38 
 10.94 
 0.46 
 2 
 
 4 8 
 10.96 
 4-0.18 
 
 3 
 
 49 
 10.55 
 -0.25 
 
 3 
 
 50 
 11.30 
 + 0.60 
 
 i 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 76 
 
 9-39 
 -0.24 
 
 4 
 
 74 
 8.68 
 -0.47 
 6 
 
 76 
 8.65 
 0.50 
 3 
 
 92 
 9 03 
 
 -O.22 
 
 I 
 
 95 
 8.32 
 -0.48 
 
 5 
 
 IO2 
 
 8.95 
 + O.II 
 
 3 
 
 136 
 9-38 
 -o. 16 
 
 2 
 
 170 
 10.79 
 -o. 24 
 I 
 
 157 
 
 10.60 
 
 + 0.58 
 
 i 
 
 I9O 
 II .42 
 -O.O2 
 I 
 
 227 
 12.50 
 + 0.28 
 
 i 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 182 
 11.30 
 + 0.22 
 
 I 
 
 222 
 
 12.38 
 + 0.24 
 I 
 
 218 
 11.88 
 -0.17 
 i 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 254 
 12.42 
 O.2I 
 
 I 
 
 281 
 
 13-45 
 + 0.18 
 
 3 
 
 322 
 
 14.00 
 +0.30 
 
 2 
 
 336 
 J3-36 
 O.29 
 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 15 
 
 12.58 
 
 + 0.22 
 
 7 
 
 17 
 12.85 
 + 0.45 
 i 
 
 18 
 12.42 
 
 + O.O2 
 
 22 
 12. 8 
 
 + 0. 5 
 
 43 
 11.32 
 + 0.13 
 4 
 
 76 
 
 9-54 
 + 0.41 
 
 4 
 
 99 
 9.24 
 
 + 0.44 
 4 
 
 
 172 
 11. iS 
 + 0.48 
 
 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 254 
 12.80 
 O.O2 
 I 
 
 258 
 13.28 
 + 0.38 
 
 I 
 
 263 
 12.29 
 O.7O 
 I 
 
 286 
 13-42 
 + O. IO 
 I 
 
 289 
 13.00 
 -0.39 
 
 I 
 
 318 
 
 13 57 
 -0.13 
 i 
 
 321 
 13.61 
 0.09 
 
 2 
 
 346 
 I3-48 
 + 0.06 
 I 
 
 336 
 I3-50 
 O. H 
 I 
 
 343 
 13 56 
 + 0.14 
 4 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 4i 
 11.26 
 0.06 
 
 2 
 
 62 
 9.20 
 -0.48 
 
 2 
 
 76 
 9.46 
 + 0.6I 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 109 
 8.41 
 -0.39 
 
 i 
 
 134 
 8.78 
 
 0.40 
 I 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 17 
 12.40 
 
 O.O2 
 
 18 
 
 45 
 11.03 
 
 O.OI 
 
 15 
 
 74 
 9.12 
 0.03 
 
 22 
 
 98 
 8.78 
 0.03 
 i. 
 
 135 
 
 9.18 
 
 0.03 
 
 168 
 10.94 
 + 0.4; 
 
 4 
 
 1 86 
 11.36 
 
 + 0.12 
 
 222 
 12.25 
 + O. 12 
 
 257 
 12.70 
 
 o. 14 
 4 
 
 284 
 13.35 
 
 + 0.05 
 
 1 
 
 321 
 '3 76 
 + O.O6 
 
 c 
 
 341 
 13-49 
 
 O.OI 
 
 8 
 
CHAPTER V. R 
 
 TABLE 41. 4315 R COJLE. OBSERVED MAXIMA AND MINIMA. 
 
 Elements of maximum. 1856 Dec. 20 (J. D. 2399304)+361.8 d E. M-m=119 d . 
 
 MAXIMA. 
 
 MINIMA. 
 
 I 
 W 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 4 
 13 
 23 
 15 
 17 
 i 
 
 4 
 
 5 
 5 
 
 i 
 
 6, 
 W 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 38 
 40 
 
 4i 
 42 
 44 
 45 
 46 
 48 
 49 
 
 1894 Sept. 3 
 1896 Aug. 30 
 1897 Aug. 19 
 1898 Aug. 23 
 1900 Aug. 10 
 1901 Aug. 15 
 1902 July 29 
 1904 July 28 
 1905 July 24 
 
 3075 
 3802 
 4156 
 4525 
 5242 
 5612 
 5960 
 6690 
 7051 
 
 me 
 
 8.92 
 8.40 
 9.o 
 9.20 
 me 
 me 
 8.40 
 8.90 
 
 9.22 
 
 8.70 
 
 9-3 
 9-50 
 
 8.70 
 9.20 
 
 + 23 
 + 26 
 + 18 
 + 25 
 + 19 
 + 27 
 
 + 13 
 
 + 20 
 + 19 
 
 40 
 41 
 42 
 43 
 44 
 45 
 46 
 
 47 
 48 
 
 49 
 
 1896 Apr. 30 
 1897 Apr. 14 
 1 898 Apr. 13 
 1 899 Apr. i 
 1 900 Apr. i 
 1901 Mar. 26 
 1 902 Mar. 17 
 1 903 Feb. 25 
 1 904 Mar. 24 
 1 905 Mar. 17 
 
 3680 
 4029 
 
 4393 
 4746 
 
 5"i 
 
 5470 
 5826 
 6171 
 6564 
 6922 
 
 me 
 me 
 me 
 me 
 13-98 
 me 
 '3-73 
 i3-7 
 me 
 
 13-67 
 
 
 + 23 
 + 9 
 
 + 12 
 
 + 4 
 + 7 
 + 4 
 
 2 
 -19 
 + 13 
 
 + 9 
 
 2 
 
 4 
 4 
 
 2 
 
 27 
 
 3 
 ii 
 
 i 
 
 3 
 18 
 
 
 
 14.28 
 
 14-03 
 
 14. o 
 
 '3-97 
 
 TABLE 42.- R COM^E. VARIOUS DETERMINATIONS OF 
 COMPARISON STARS. 
 
 
 
 
 
 J.'A. 
 
 Star. 
 
 Hagen. 
 
 HCO. 
 
 H. M. 
 Parkhurst. 
 
 Parkhurst. 
 
 
 
 
 
 
 
 H. 
 
 p. 
 
 F 
 
 8.2 
 
 7.61 
 
 7.82 
 
 7.62 
 
 7.92 
 
 a 
 
 8.6 
 
 
 8.90 
 
 9.09 
 
 9 39 
 
 R 
 
 8.8 
 
 9.01 
 
 9 36 
 
 9.15 
 
 9-45 
 
 lU 
 
 93 
 
 9.62 
 
 IO. II 
 
 10. 14 
 
 10.44 
 
 d 
 
 IO.O 
 
 10.81 
 
 10.97 
 
 10.67 
 
 10.97 
 
 c 
 
 10 8 
 
 12 46 
 
 
 
 
 u 
 
 
 13.20 
 
 
 12. 8l 
 
 13.11 
 
 
 Some of the various magnitude scales for the comparison stars are collected 
 in Table 42. It will be seen that the Hagen scale is very much compressed, 
 the interval between F and c being only 2.6 magnitudes, whereas it is 4.81 by my 
 measures and 4.85 by the Harvard measures. This may be due in part to the 
 yellow color of the star F, but seems mainly due to the star c. No magnitudes 
 have heretofore been published for stars suitable for comparison with the variable 
 near minimum, evidently because it has not been observed at that part of the 
 light curve. 
 
 The redness of the variable is given as 4.0 in Chandler's Third Catalogue. 
 Photographically it is at least one magnitude fainter than r at minimum. 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 PAYS 
 
 100 zoo ' 300 400 
 
 +315 R COMAE 
 
 Max. - 
 Mm. 3Z2 
 M-m /*<? 
 
 10 
 
 o 
 
 \ 
 
 o 
 
 I 
 
 FIG. 15. MBAN LIGHT-CURVB OF R COMM. 
 
CHAPTER VI. 
 
 5798 RU HERCULIS. 
 R. A. i6 h 6m 2 s 7; Dec. +25 19' 56" (1900). 
 
 This is another of Anderson's discoveries, to which Chandler assigned the 
 above notation in the Astronomical Journal 17, 64. Some confusion may arise 
 from the number 57963 being given it in the Astronomische Nachrichten. The 
 announcement of discovery was made in 1896 and observations began in January, 
 1897. One other series has been published by H. M. Parkhurst and A. C. Perry. 
 The details of Hartwig's observations have not appeared, while Esch has pub- 
 lished only three comparisons. 
 
 The places of the brighter comparison stars were measured in July, 1897, 
 with the 6-inch, and the fainter stars o, m, n and g in June, 1900, with the 40- 
 inch. These places have all been checked on the photograph. The star p was 
 selected and used with the 6-inch, but its photometric magnitude was measured 
 only with the 4O-inch, and seems to be too large numerically. 
 
 The place of the variable given above was found by applying the coordinates 
 in Table 45 to the Cambridge A. G. positions of the stars a, b, s, and /. It agrees 
 closely with that given by Hartwig. 
 
 The light curve shows considerable range in the magnitude at maximum, 
 at least from 7.4 to 8.8 on the Harvard system, with the alternate maxima bright. 
 The minima are more uniform at about 14.0. There is an unmistakable halt 
 in both branches of the curve, at somewhat different magnitudes. This does 
 not amount to a secondary maximum, if we may trust the evidence before us. 
 
 The last comparison used in forming the mean light curve is that of 1905, 
 January 12. 
 
 5798 RU HERCULIS. 
 TABLB 43. STANDARD MAGNITUDE STARS. 
 
 Star. 
 
 B. D. No. 
 
 1900. 
 
 Color 
 P. DM. 
 
 Magnitude. 
 
 Residuals. 
 
 R. A. 
 
 Dec. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nights 
 inter 
 se. 
 
 H.C.O. 
 
 RDM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 B 
 C 
 I 
 
 O 
 
 + 27 2595 
 + 27 2597 
 + 25 3039 
 
 Mean . . 
 
 h m s 
 16 05 58 
 16 07 01 
 16 05 56 
 
 / 
 
 + 27 00.5 
 + 27 09.8 
 -t-25 44-8 
 
 GW + 
 GW- 
 GW- 
 
 6.68 
 
 7-37 
 7.48 
 
 6.88 
 7.80 
 7.68 
 
 6.62 
 
 7-53 
 7-39 
 
 6.89 
 7.80 
 7.66 
 
 - 6 
 + 16 
 - 9 
 
 + i 
 o 
 
 2 
 
 7 
 
 2 
 
 4 
 
 7.18 
 
 7-45 
 
 7.18 
 
 7-45 
 
 10 
 
 I 
 
 4 
 
 
 
 
 
 73 
 
74 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 44. 5798 RU HERCULIS. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 1855- 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 star. 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 O 
 
 
 h m s 
 
 t 
 
 
 O 
 
 
 h m s 
 
 O ' 
 
 11 
 
 + 25 3031 
 
 8.3 
 
 16 I 21 
 
 + 25 17.9 
 
 X 
 
 + 25 3040 
 
 9-5 
 
 16 4 28 
 
 + 25 50-0 
 
 t 
 
 + 25 3036 
 
 8.4 
 
 16 2 48 
 
 + 25 18.8 
 
 a 
 
 + 25 3042 
 
 8.5 
 
 16 5 19 
 
 + 25 20.2 
 
 2 
 
 + 25 3037 
 
 9-5 
 
 16 3 29 
 
 + 25 53-5 
 
 s 
 
 + 25 3044 
 
 8.8 
 
 16 5 23 
 
 + 25 48.2 
 
 w 
 
 + 25 3038 
 
 95 
 
 16 4 2 
 
 + 25 6.5 
 
 b 
 
 + 25 3046 
 
 9.0 
 
 16 5 48 
 
 + 25 36.5 
 
 TABLE 45. COMPARISON STARS FOR RU HERCULIS. 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 
 n 
 
 s 
 
 ft 
 
 
 
 
 
 
 u 
 
 -2273 
 
 -167.9 
 
 - 558 
 
 26.5 
 
 
 
 8.81 
 
 9.08 
 
 t 
 
 I IIO 
 
 82.0 
 
 - 493 
 
 26.7 
 
 
 
 8.80 
 
 9.07 
 
 z 
 
 560 
 
 - 4i-4 
 
 + 1580 
 
 17.0 
 
 10.15 
 
 10.42 
 
 
 
 w' 
 
 - 208 
 
 - 15-4 
 
 + i 
 
 -7-5 
 
 14.68 
 
 14-95 
 
 
 
 y 
 
 - 199 
 
 - J4-7 
 
 + 2575 
 
 17-5 
 
 
 
 10.36 
 
 10.63 
 
 P 
 
 - 179 
 
 - 13-2 
 
 - 315 
 
 o 
 
 13-42 
 
 13.69 
 
 
 
 t' 
 
 - 99 
 
 - 7-3 
 
 12 
 
 -9.1 
 
 15-23 
 
 15-50 
 
 
 
 y 
 
 QJ. 
 
 6 q 
 
 CJ.fi 
 
 
 
 
 
 
 i 
 
 V*r 
 
 - 87 
 
 ** ' " 
 
 - 6.4 
 
 ot^ 
 + 1491 
 
 34-0 
 
 7-39 
 
 7.66 
 
 
 
 w 
 
 - 84 
 
 - 6.2 
 
 -1239 
 
 15-0 
 
 
 
 10.77 
 
 n .04 
 
 i 
 
 - 59 
 
 - 4-4 
 
 + 368 
 
 IO.O 
 
 
 
 ii .64 
 
 ii .91 
 
 q 
 
 + 24 
 
 + 1.8 
 
 - 481 
 
 12.0 
 
 
 
 n .29 
 
 11.56 
 
 n 
 
 + 35 
 
 + 2.6 
 
 184 
 
 2.8 
 
 12.75 
 
 13.02 
 
 
 
 m 
 
 + 44 
 
 4- 3-3 
 
 ~ 243 
 
 4-i 
 
 12.40 
 
 12.67 
 
 
 
 g 
 
 + 9i 
 
 + 6.7 
 
 - 49 
 
 8.0 
 
 11.96 
 
 12.23 
 
 
 
 h 
 
 + 187 
 
 + 13-8 
 
 + 191 
 
 6.0 
 
 12.06 
 
 12.33 
 
 
 
 X 
 
 + 232 
 
 + 17-1 
 
 + 1342 
 
 16.4 
 
 
 
 10.54 
 
 10.81 
 
 c 
 
 + 267 
 
 + 19-7 
 
 + 669 
 
 14.0 
 
 
 
 10.94 
 
 II. 21 
 
 e 
 
 + 313 
 
 + 23.1 
 
 + 423 
 
 IO. I 
 
 11-39 
 
 ii!66 
 
 
 
 d 
 
 + 473 
 
 + 35-o 
 
 + 77i 
 
 13-' 
 
 
 
 11.09 
 
 11.36 
 
 a 
 
 + 921 
 
 + 68.1 
 
 - 384 
 
 29.7 
 
 8.61 
 
 8.88 
 
 
 
 s 
 
 + 981 
 
 + 72-5 
 
 + 1239 
 
 26.9 
 
 9.22 
 
 9-49 
 
 
 
 b 
 
 + 1335 
 
 + 98.6 
 
 + 580 
 
 21.0 
 
 9 58 
 
 9.85 
 
 
 
STELLAR PHOTOMETRY. 
 + im 
 
 N 
 o m 
 
 PLATE 6. 
 
 x 
 
 s 
 
 .a 
 
 c 
 
 .f 
 
 i 
 
 
 
 n 
 
 -w 
 
 u 
 
 1- 20' 
 
 -+ 10' 
 
 -- 10' 
 
 Scale, i mm= 15". 3. 
 
 5798 RU HERCUUS. 
 
 R. A. i6li 6m 2 s. 7 . Dec. + 25 19' 56", 1900. 
 
CHAPTER VI. RU HERCULIS. 
 TABLE 46. 5798 RU HERCULIS. PHOTOMETER MEASURES OF COMPARISON STARS. 
 
 75 
 
 1904 July 31 6-INCH. Good; twilight at beginning. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 klean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 I? 5 
 
 17 25 
 
 o 
 20 
 
 24 
 24 
 
 23 
 
 C 
 B^ 
 I 
 
 z 
 s 
 b 
 a 
 v 
 a 
 b 
 s 
 z 
 
 / 
 
 B.,, 
 Cat 
 C 
 
 n . i 11.7 10.3 
 7.0 8.1 8.7 
 9.2 9.0 9. i 
 34.1 34.0 32.9 
 25.3 25.0 25.3 
 27.8 28.2 27.6 
 18.7 J8.9 18.6 
 42.8 41.5 42.7 
 18.8 18.9 19.8 
 28.0 27.8 27.9 
 26.6 26.8 26. i 
 
 33-8 34-5 34-0 
 10.3 8.7 10.3 
 9.0 9.2 9.2 
 16.7 17.0 16.0 
 ii. 2 ii .2 10.9 
 
 11.03 
 
 7-93 
 9. 10 
 33.67 
 25.20 
 27.87 
 18.73 
 42.33 
 19.17 
 27.90 
 26.50 
 34-i 
 9.77 
 9-i3 
 16.57 
 
 II . 10 
 
 11.07 
 8.53 
 9-44 
 33-89 
 25-85 
 27.89 
 
 18.95 
 
 0.40 
 o. 16 
 0.24 
 3-17 
 
 2.22 
 2-44 
 
 i-47 
 
 4-05 
 
 7-56 
 7-32 
 7.40 
 
 10.33 
 9-38 
 9.60 
 8.63 
 
 11.21 
 
 7-83 
 7-59 
 7.67 
 10.60 
 
 9-65 
 9.87 
 8.90 
 11.48 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 September 3. Good; twilight at beginning. 
 
 18 24 
 18 48 
 
 34 
 36 
 
 37 
 37 
 
 Bai 
 Cal 
 C 
 I 
 
 fa 
 
 2 
 i- 
 
 6 
 a 
 
 11 
 a 
 b 
 s 
 
 z 
 
 I 
 
 C 
 B. 
 
 7.0 6.9 7.9 
 15.3 16.0 16.3 
 9.2 10.1 9.2 
 8.0 8.0 7.7 
 15.9 16.7 16. i 
 30.1 30.5 31.2 
 
 21 . I 21-5 21.8 
 24.7 25.2 25.0 
 
 17.2 17.7 18.1 
 27. I 27.2 27.8 
 17.5 16.8 18.5 
 26.2 26.9 26.8 
 24.9 24.0 24.2 
 32.5 32.2 32.1 
 8.2 7.0 7.8 
 
 IO.O 9.8 IO.2 
 
 6.8 6.3 8.1 
 
 7-27 
 15.87 
 9-50 
 7.90 
 16.23 
 30.60 
 
 21-47 
 24.97 
 17.67 
 27.27 
 17.60 
 26.63 
 24-37 
 32.27 
 7.67 
 
 IO.OO 
 
 7.07 
 
 7.17 
 
 0.07 
 
 1. 06 
 0.27 
 
 O. II 
 I. 12 
 
 2.85 
 
 1 .92 
 
 2.22 
 
 I-3I 
 2.38 
 
 7-31 
 8.30 
 7-51 
 
 7-35 
 8.36 
 10.09 
 9. 16 
 9.46 
 
 8-55 
 9.62 
 
 7-58 
 8.57 
 7-78 
 7.62 
 8.63 
 10.36 
 9-43 
 9-73 
 8.82 
 9.89 
 
 9-75 
 7-79 
 
 31-44 
 22.92 
 25.80 
 17.69 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 September 4. Quiet; stars dull; fair measures. 
 
 19 18 
 
 19 22 
 
 41 
 
 43 
 43 
 
 C 
 fi, 
 I 
 z 
 i 
 6 
 a 
 a 
 6 
 s 
 z 
 
 I 
 
 Bai 
 C 
 
 13-3 14-3 H 2 
 14.3 14.0 13.9 
 12.9 13.3 12.8 
 
 35-6 34-5 35-i 
 28.6 29.2 28.8 
 30.3 30.6 30.5 
 24.2 25.2 24.5 
 23.8 24.1 24.1 
 28.7 29.0 29.8 
 28.2 28.2 27.8 
 37.0 36.8 36.4 
 13.0 12.9 12.9 
 
 13-7 '3-4 '44 
 13.4 14.2 14.6 
 
 13-93 
 14.07 
 13.00 
 
 35.07 
 28.87 
 
 30-47 
 24.63 
 
 24.00 
 
 29.17 
 28.07 
 
 36.73 
 12.93 
 
 13 83 
 14.07 
 
 14.00 
 
 13-95 
 12.97 
 35-90 
 28.47 
 29.82 
 24.32 
 
 0.79 
 0.78 
 0.63 
 
 3-45 
 
 2 51 
 2.6 7 
 2.07 
 
 7-49 
 
 7.48 
 
 7-33 
 10.15 
 9.21 
 
 9-37 
 8.77 
 
 7.76 
 7-75 
 7.60 
 10.42 
 9.48 
 9.64 
 9.04 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
7 6 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 46. 5798 RU HBRCUUS. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1904 August ii. 12-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6 
 
 H. 
 
 P. 
 
 18 2 
 18 28 
 
 O 
 
 29 
 33 
 
 m 
 n 
 
 11 
 
 I 
 
 e 
 a 
 b 
 
 s 
 z 
 z 
 s 
 
 b 
 
 a 
 e 
 h 
 
 g 
 n 
 m 
 
 54-8 54-3 53-5 
 57-4 58-2 58.3 
 34-5 35-8 35-4 
 46.4 46.4 46.9 
 48.3 47.8 47.3 
 43.0 42.9 43.1 
 15.0 14.9 14.8 
 23.9 24.0 25.0 
 18.5 18.7 19.2 
 30.6 31.2 30.6 
 31.8 31.1 31.5 
 
 22.0 23.7 22.5 
 23.1 23.5 23.8 
 
 15.7 16.0 15.1 
 
 42.O 42.0 42. 2 
 
 48 . i 49 . 2 48 . 4 
 49-i 50.7 48.8 
 55-J 55.7 56.0 
 52.4 52.8 52.0 
 
 54-20 
 57-97 
 35-23 
 46-57 
 47.80 
 43-00 
 14.90 
 24.30 
 18.80 
 30.80 
 
 31-47 
 22.73 
 
 23-47 
 15.60 
 42.07 
 48.57 
 49-53 
 55 60 
 52-40 
 
 53-30 
 56.79 
 
 5 10 
 5-33 
 
 3-22 
 
 4-63 
 4-59 
 4.06 
 i. 08 
 
 2. IO 
 
 1.80 
 
 2.77 
 
 12.55 
 12.78 
 10.67 
 12.08 
 12.04 
 ".51 
 8-53 
 9-55 
 9-25 
 
 IO.22 
 
 12.82 
 13.05 
 10.94 
 
 12.35 
 12.31 
 11.78 
 8.80 
 9.82 
 9-52 
 10.49 
 
 48.05 
 48.19 
 
 42.52 
 15-25 
 23.89 
 20.77 
 31-14 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 September 8. Fair to good; quiet; rather dull. 
 
 19 20 
 
 19 47 
 
 42 
 47 
 
 z 
 s 
 
 b 
 
 a 
 m 
 n 
 
 g 
 
 v 
 h 
 e 
 e 
 h 
 v 
 
 g 
 n 
 m 
 a 
 b 
 s 
 z 
 
 24.6 24.2 23.2 
 16.9 16.8 15.9 
 18. i 18.6 18.9 
 
 II .8 12.2 12.4 
 
 47.0 46. i 46.2 
 50.3 50.0 49.1 
 40.0 40.6 40.6 
 '7- 8 '5-3 16-2 
 43-7 43-i 43.6 
 36.1 35-7 36.3 
 37.2 36.8 36.9 
 42.8 42.9 43.1 
 
 '7-7 17-7 15-5 
 41.1 41.1 40.3 
 52. i 50.0 51. i 
 45.2 46.2 45.3 
 
 13-5 13-7 12-9 
 21 .O 20.3 19.7 
 
 16.0 16.4 16.8 
 26.4 25.4 26. i 
 
 24.00 
 16.53 
 18.53 
 
 12. 13 
 
 46.43 
 49.80 
 40.40 
 16.43 
 
 43-47 
 36-03 
 
 36.97 
 42-93 
 16.97 
 40.83 
 51-07 
 45-57 
 '3-37 
 20.33 
 16.40 
 25-97 
 
 24.99 
 16.47 
 19.43 
 12.75 
 45.00 
 
 50.44 
 40.63 
 16.70 
 43.20 
 36 50 
 
 2. 2O 
 1-25 
 1-63 
 0.76 
 
 4-33 
 4-85 
 3-85 
 1.29 
 4.12 
 3-37 
 
 10. 13 
 
 9.18 
 
 9 56 
 
 8.69 
 
 12.26 
 12.78 
 11.78 
 9.22 
 12.05 
 11.30 
 
 10.40 
 9-45 
 9 83 
 8.96 
 
 12.53 
 13 05 
 12.05 
 
 9-49 
 12.32 
 
 11-57 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 September 9. Quiet; quite good. 
 
 19 o 
 19 27 
 
 39 
 
 44 
 
 z 
 s 
 
 b 
 
 a 
 m 
 n 
 
 Tl 
 g 
 
 h 
 e 
 e 
 h 
 
 g 
 v 
 n 
 m 
 a 
 b 
 s 
 z 
 
 30.0 30.0 29.8 
 19.8 19.2 19.6 
 23-2 23.5 23.2 
 15.8 16.8 15.8 
 51.5 51.4 50.8 
 55-2 55-1 55-6 
 19.6 18.8 19.8 
 47.3 48.8 47.8 
 50.0 49.2 49.2 
 40.2 41.2 41 .9 
 41 .0 41 .2 41 .6 
 46.2 47.5 48.0 
 47.0 47.6 47.3 
 19.8 17.8 18.8 
 54-0 55-8 57.1 
 52.0 52.1 51.7 
 15.2 15.8 15.5 
 26.7 26.3 25.6 
 
 22.2 21 .6 21.9 
 30.6 30.5 30.0 
 
 29-93 
 19-53 
 23-33 
 16.13 
 
 51-57 
 55-30 
 19.40 
 47-97 
 49-47 
 41 . 10 
 41.27 
 47-23 
 47-30 
 18.80 
 55.63 
 51-93 
 15-50 
 26.20 
 21.90 
 30.37 
 
 30-15 
 20.72 
 
 24-77 
 15.82 
 
 51-75 
 55-47 
 19.10 
 47.64 
 
 48.35 
 41.19 
 
 2.67 
 
 i-79 
 2.18 
 1.17 
 4.96 
 
 5-25 
 1.61 
 
 4-59 
 4 65 
 3-91 
 
 IO. II 
 
 9.23 
 
 9.62 
 8.61 
 12.40 
 12.69 
 9 05 
 12.03 
 12.09 
 "35 
 
 10.38 
 9-50 
 9.89 
 8.88 
 12.67 
 12.96 
 9-32 
 12.30 
 12.36 
 ii .62 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER VI. RU HERCUUS. 77 
 
 TABLE 46. 5798 RU HERCUUS. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1902 March 5. 40-INCH. Fair. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star- 
 
 Scale Readings. 
 
 Hean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 p. 
 
 '4 35 
 
 
 h 
 
 g 
 n 
 m 
 
 P 
 
 w' 
 t' 
 
 g 
 
 h 
 
 22.9 23.9 24.6 
 22.5 21.8 23.0 
 30.1 30.8 29.7 
 24.8 25.0 24.7 
 35-8 35-2 34-7 
 45-3 45-4 45-0 
 56.4 54.0 55.0 
 23.2 23.3 22.8 
 23.0 22.7 21.9 
 
 23.80 
 22.43 
 30.20 
 24-83 
 35-23 
 45-23 
 55-13 
 23.10 
 
 22.53 
 
 23-17 
 
 22.72 
 
 2.04 
 
 2.00 
 2.67 
 2.18 
 3-22 
 4.36 
 5.24 
 
 12. II 
 12.07 
 12.74 
 12.25 
 13.29 
 I4.43 
 I5.3I 
 
 12.38 
 
 12.34 
 13.01 
 12.52 
 13.56 
 14.70 
 15.58 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1902 March 15. Clear; unsteady. 
 
 15 10 
 
 
 h 
 
 g 
 n 
 m 
 
 P 
 
 w 
 
 P 
 m 
 n 
 
 g 
 h 
 
 30.0 30.2 31.5 
 30.0 28. i 28.7 
 
 35-7 38.3 36.3 
 34.8 34.0 34.0 
 43.0 43.4 44.3 
 59.2 60.0 59.0 
 42.1 44.5 43.0 
 33-5 34-2 33-4 
 38.3 37-2 36.8 
 31.1 32.3 30.0 
 34-2 33-5 31-0 
 
 30.57 
 28.93 
 36.77 
 34-27 
 43-57 
 59.40 
 
 43-53 
 33-70 
 37-43 
 31.13 
 32.83 
 
 31-70 
 30.03 
 37-10 
 33-99 
 
 43-55 
 
 2.83 
 2.6 5 
 3-45 
 3-07 
 4. 16 
 5.46 
 
 12. 12 
 11.94 
 
 12-74 
 12.36 
 
 13-45 
 14-75 
 
 12.39 
 
 12. 21 
 13.01 
 12.63 
 '3 72 
 15 02 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1902 March 15. Light turned down. 
 
 
 
 n 
 m 
 
 $ 
 
 t' 
 t' 
 w' 
 
 P 
 m 
 n 
 
 27.2 28.4 29.0 
 26.8 24.5 25.3 
 36.8 37.3 36.1 
 47.8 48.8 48.0 
 57.0 52.8 56.2 
 53-3 54-7 54-0 
 47-2 47-8 49-8 
 36.2 34.2 34.8 
 24-3 25.3 24.7 
 30.8 27.4 29.2 
 
 28.20 
 25-53 
 36.73 
 48.20 
 
 55-33 
 54-00 
 
 48.23 
 35-07 
 24-77 
 29 13 
 
 28.67 
 25.15 
 35 90 
 48.22 
 54.67 
 
 2.52 
 2.21 
 3-29 
 4-64 
 5.20 
 
 12.74 
 12-43 
 I3.5I 
 14.86 
 15.42 
 
 13.01 
 12. 70 
 13.78 
 I5-I3 
 15 69 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1902 May 2. Seeing good; perhaps variable. 
 
 12 45 
 
 
 h 
 
 g 
 
 
 m 
 Vaa 
 t' 
 TV' 
 w' 
 
 t' 
 
 Vat 
 m 
 n 
 
 f 
 
 27.4 30.1 29.9 
 30.0 28.5 29.0 
 27. i 27.8 28.2 
 33-2 33-5 34-4 
 32.2 32.9 32.3 
 15.7 16.5 17.3 
 61.3 61.5 58.8 
 55-3 55-0 55-3 
 S3- 1 53-o 52 9 
 56.3 57-5 58.3 
 16.0 16.1 15.2 
 
 31 9 31-7 31-9 
 34-8 35-0 37- 2 
 27.5 27.5 28.9 
 28.1 29.1 30.5 
 
 32.4 33-3 30.4 
 31.0 30.9 30.4 
 
 29.13 
 29.17 
 27.70 
 33.70 
 32.47 
 16.50 
 60.50 
 55-20 
 53-oo 
 57-37 
 15-77 
 31-83 
 35-67 
 27.97 
 29.23 
 3I-I9 
 
 30. 16 
 29.20 
 27.84 
 34 69 
 32.15 
 16. 14 
 
 58.94 
 54-to 
 
 2.67 
 2-57 
 2-45 
 3-16 
 
 2.88 
 
 I. 21 
 
 5-44 
 5.16 
 
 1 2. 2O 
 12. IO 
 
 ii 93 
 12.69 
 12.41 
 
 10.74 
 
 14.97 
 14.69 
 
 12.47 
 
 12-37 
 I2.J5 
 12.96 
 
 12.68 
 ii .01 
 
 15-24 
 14.96 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 47. 5798 RU HERCUUS. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 1904 July 31. 
 
 1904 September 3. 
 
 1904 September 4. 
 
 C. 
 
 Obs. Mag. 
 
 4 Mag. 
 
 C. 
 
 Obs. 
 
 Mag. 
 
 A Mag. 
 
 C. 
 
 Obs. 
 
 Mag. 
 
 J Mag. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 p. 
 
 B 
 C 
 
 I 
 
 -0.59 
 0.40 
 o. 24 
 
 6-57 
 7-56 
 7.40 
 
 6.84 
 
 7-83 
 7.67 
 
 . i 
 + .1 
 .0 
 
 i -.04 
 9 +.03 
 8 .01 
 
 -0.68 
 o. 29 
 
 O.2O 
 
 6.56 
 7-53 
 7-44 
 
 6.83 
 7.80 
 
 7-71 
 
 . 12 
 
 + .16 
 - .04 
 
 - -05 
 .00 
 
 + .03 
 
 0.03 
 0.79 
 0.63 
 
 6-73 
 7-49 
 
 7 33 
 
 7 
 7 
 7 
 
 .00 
 .76 
 .60 
 
 + .0; 
 
 + .1: 
 
 - -i; 
 
 + .12 
 - .04 
 .08 
 
 Means. 
 M .... 
 
 O.O2 
 
 7.18 
 7.16 
 
 7-45 
 7-43 
 
 .i 
 
 3 -03 
 
 O.O6 
 
 7.18 
 7-24 
 
 7-45 
 7-51 
 
 .07 
 
 .03 
 
 0.48 
 
 7.18 
 6.70 
 
 7 
 6 
 
 45 
 97 
 
 .ii 
 
 .08 
 
 12-INCH. 
 
 40-INCH. 
 
 Star. 
 
 Mag. 
 6-inch 
 
 C. 
 
 Star. 
 
 Mag. 
 i2-inch. 
 
 C. 
 
 Sept. 9. 
 
 \ug. ii. Sept. 8 
 
 Mar. 5. 
 
 Mar. 15. 
 
 May 2. 
 
 Mar. 15. 
 
 
 8.65 
 9.48 
 9-25 
 10. 19 
 
 1.17 
 2.18 
 
 1-79 
 2.67 
 
 i. 08 0.76 
 2.10 1.63 
 i. 80 1.25 
 2.77 2. 20 
 
 
 ii 
 
 12 
 12 
 12 
 
 .96 
 
 .06 
 
 .40 
 
 75 
 
 2 .OO 
 2.O4 
 2.18 
 2.6 7 
 
 2.65 
 2.83 
 3-07 
 3-45 
 
 2-45 
 2-57 
 2.88 
 3.16 
 
 
 b 
 
 ...:. .. 
 
 
 
 m 
 
 n . 
 
 Me 
 Me 
 M 
 
 
 2.21 
 
 2.52 
 
 z 
 
 in C. ... 
 
 Meat 
 Meat 
 M 
 
 1 C .. . 
 
 
 i-95 
 
 9-39 
 7-44 
 
 i . 94 i . 46 
 9-39 9-39 
 7-45 7-93 
 
 
 2.22 
 12.29 
 IO.O7 
 
 3.00 
 12.29 
 9.29 
 
 2.76 
 12.29 
 9-53 
 
 2.36 
 12.58 
 IO.22 
 
 i Mag. 
 
 9-39 
 
 in Mag. 
 
 12 
 
 .29 
 
 
 
 
CHAPTER VI. RU HERCULIS. 
 
 TABLE 48. 5798 RU HERCULIS. MEAN MAGNITUDES. 
 
 79 
 
 6-INCH. 
 
 Star. 
 
 July 31. 
 
 September 3. 
 
 September 4. 
 
 Mean. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 4 Mag. 
 
 B 
 
 6.57 
 7-56 
 7.40 
 
 -0.05 
 + 0.03 
 
 4-O.OI 
 
 6.56 
 7-53 
 7-44 
 
 0.06 
 
 O.OO 
 
 +0.05 
 
 6.73 
 7-49 
 7-33 
 
 4-o. ii 
 0.04 
 0.06 
 
 6.62 
 7-53 
 7-39 
 
 6.89 
 7.80 
 7.66 
 
 0.07 
 0.02 
 0.04 
 
 C. 
 
 1 
 
 J 
 
 Q, 
 
 lean 
 
 7.18 
 
 7-45 
 
 0.04 
 
 
 8.63 
 9.60 
 9-38 
 10-33 
 
 O.O2 
 4-O. 12 
 + 0.13 
 + 0.14 
 
 8-55 
 9.46 
 9. 16 
 10.09 
 
 0. IO 
 O.O2 
 
 0.09 
 
 O. 10 
 
 8.77 
 9-37 
 9.21 
 10.15 
 
 4-o. 12 
 
 O. II 
 
 0.04 
 0.04 
 
 8.65 
 9.48 
 
 9-25 
 10. 19 
 
 8.92 
 9-75 
 9-52 
 10.46 
 
 0.08 
 0.08 
 0.09 
 0.09 
 
 b 
 
 s 
 
 2 
 
 1 
 
 lean 
 
 9-39 
 
 9.66 
 
 0.08 
 
 
 
 
 
 
 
 
 1 2-INCH. 
 
 Star. 
 
 August ii. 
 
 September 8. 
 
 September 9. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 JMag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. H. Mag. P.j J Mag. 
 
 
 8-53 
 9-55 
 9-25 
 
 10.22 
 
 -0.08 
 -0.03 
 + 0.04 
 + 0.07 
 
 8.69 
 9-56 
 9.18 
 10.13 
 
 + 0.08 
 
 O.O2 
 0.04 
 O.O2 
 
 8.6: 
 9.62 
 9-23 
 
 IO. II 
 
 O.OO 
 
 4-0.04 
 4-0.01 
 0.04 
 
 8.61 
 9-58 
 9.22 
 10.15 
 
 8.88 
 9-85 
 9-49 
 10.42 
 
 0.05 
 0.03 
 0.03 
 0.04 
 
 6 
 
 s 
 
 2 
 
 ! 
 
 g 
 
 Jean 
 
 9-39 
 
 9.66 
 
 0.04 
 
 
 11.51 
 
 12.08 
 I2.O4 
 
 12-55 
 12.78 
 
 + O. 12 
 4-O. 12 
 O.O2 
 + 0.15 
 + 0.03 
 
 11.30 
 
 11.78 
 12.05 
 12.26 
 12.78 
 
 O.O9 
 
 -0.18 
 
 O.OI 
 
 -0.14 
 4-0.03 
 
 "35 
 12.03 
 12.09 
 12.40 
 12.69 
 
 0.04 
 4-0.07 
 + 0.03 
 
 O.OO 
 
 0.06 
 
 ii 39 
 ii .96 
 12.06 
 12.40 
 12-75 
 
 11.66 
 12.23 
 
 12.33 
 12.67 
 13.02 
 
 0.08 
 
 O. 12 
 O.O2 
 O. IO 
 0.04 
 
 
 :::::::::::::::::: 
 
 m 
 
 w 
 
 J 
 
 lean 
 
 12. II 
 
 12.38 
 
 0.07 
 
 
 
 
 
 
 
 
 4O-INCH. 
 
 Star. 
 
 March 5. 
 
 March 15. 
 
 March 15. 
 
 May 2. 
 
 Mean. 
 
 Mag. 4 Mag. 
 
 Mag. 
 
 A Mag 
 
 Mag. 
 
 A Mag. 
 
 Mag. A Mag, 
 
 Mag. H. 
 
 Mag. P. 
 
 4 Mag. 
 
 1::: 
 
 m . . 
 n. . . 
 
 Mean 
 
 f'-.V. 
 
 TV'.. 
 Mean 
 
 12.07 +0.09 
 
 12. II O.OO 
 
 12.25 o.n 
 12.74 +0.01 
 
 "94 
 
 12. 12 
 12.36 
 
 12-74 
 
 0.04 
 4-0.01 
 
 O.OO 
 4-O.OI 
 
 
 
 11.93 -0.05 
 
 12. IO 4-O.OI 
 
 12.41 4-0.06 
 
 1 2 . 69 . 04 
 
 11.98 
 
 12. II 
 
 12.36 
 
 12.73 
 
 12.25 
 
 12.38 
 12.63 
 13.00 
 
 0.06 
 0.01 
 0.06 
 0.02 
 
 
 
 12-43 
 12.74 
 
 4-0.07 
 4-0.01 
 
 12.30 
 
 12.57 
 
 0.04 
 
 13.29 -0.13 
 15.31 +0.08 
 14.43 -0.25 
 
 13-45 
 H-75 
 
 + 0.03 
 +0.07 
 
 I3-5I 
 
 15-42 
 14.86 
 
 4-0.09 
 + o. 19 
 4-o.iS 
 
 
 
 13-42 
 15-23 
 14.68 
 
 13-69 
 i5-5<> 
 14-95 
 
 0.08 
 0.18 
 0.13 
 
 14.97 0.26 
 14.69 4-0.01 
 
 14.44 
 
 14.71 
 
 0.13 
 
 
 
 
 
 
 
So 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 IS 
 
 14. /a 
 
 MAGNITUDE 
 AZ // 
 
 ^f i , , 
 
 i 
 
 S798RU HERCULIS 
 
 Vf. 
 
 In 
 
 FIG. 1 6. MAGNITUDE-CURVE FOR RU HERCULIS. 
 
CHAPTER VI. RU HERCULIS. 
 
 8l 
 
 TABLE 49. 5798 RU HERCULIS VISUAL OBSERVATIONS OF THE VARIABLE. 
 
 No 
 
 Date. 
 
 jj 
 
 g 
 
 C 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 /. 
 
 J Mag. 
 
 Month 
 and Day 
 
 Hour 
 C. S.T 
 
 Julian 
 Day 
 G. M.'T. 
 
 Steps. 
 
 Mag. 
 
 i 
 
 2 
 
 3 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 10 
 ii 
 
 12 
 
 '3 
 '4 
 15 
 16 
 
 i? 
 18 
 
 '9 
 20 
 
 21 
 22 
 23 
 2 4 
 25 
 26 
 
 27 
 
 28 
 
 29 
 30 
 
 3' 
 
 32 
 
 33 
 
 34 
 35 
 36 
 
 37 
 
 38 
 
 39 
 40 
 4i 
 42 
 43 
 44 
 45 
 46 
 47 
 48 
 49 
 50 
 5i 
 52 
 
 1897 
 Jan. 7 
 
 May 5 
 
 17 
 25 
 June 7 
 20 
 25 
 
 Jiy s 
 17 
 
 21 
 23 
 
 Aug. 3 
 13 
 
 14 
 
 20 
 
 Sept. 3 
 
 12 
 13 
 '4 
 21 
 
 25 
 2 9 
 
 Oct. 14 
 23 
 29 
 Nov. 1 1 
 16 
 
 I8q8 
 Jan. 2 
 
 18 
 
 28 
 
 Feb. 12 
 Mar. 2 
 
 23 
 Apr. i 
 ii 
 14 
 25 
 
 May 7 
 
 ii 
 16 
 
 23 
 June 14 
 
 J lll y 5 
 18 
 26 
 Aug. 8 
 19 
 27 
 Sept. 7 
 Oct. 5 
 Nov. i 
 
 2 
 
 18 
 9 
 
 9 
 9 
 9 
 9 
 10 
 
 9 
 
 9 
 9 
 9 
 9 
 9 
 8 
 8 
 
 7 
 8 
 8 
 8 
 7 
 7 
 7 
 6 
 6 
 6 
 
 18 
 
 18 
 
 18 
 
 18 
 i? 
 '7 
 
 16 
 9 
 9 
 6 
 
 6 
 10 
 9 
 9 
 9 
 
 10 
 10 
 
 10 
 10 
 9 
 9 
 
 8 
 
 7 
 6 
 6 
 
 2410000+ 
 3933-00 
 
 4050.63 
 
 4062 
 4070 
 4083 63 
 4096 . 63 
 4101.63 
 4111.63 
 4123.67 
 
 4127.63 
 
 4129.63 
 4140.63 
 4150.61 
 4151.61 
 4I57-6I 
 4171.58 
 4180.58 
 4181.54 
 4182.56 
 4189.56 
 4193 56 
 
 4'97-54 
 4212.54 
 4221.54 
 4227.50 
 4240.50 
 4245-50 
 
 4293.00 
 4309.00 
 
 4319.00 
 
 4333-98 
 435L96 
 
 4372.96 
 4381.92 
 439I.63 
 4394.63 
 4405.61 
 
 4417.63 
 
 4421.65 
 4426.63 
 4433.63 
 4355.63 
 4476.67 
 4489.67 
 4497.67 
 4510.67 
 452i 63 
 4529-61 
 4540.58 
 4568.54 
 4595 50 
 4596.50 
 
 40 
 150 
 
 '50 
 150 
 150 
 40 
 ISO 
 150 
 80 
 
 150 
 
 80 
 150 
 'SO 
 150 
 15 
 150 
 150 
 150 
 150 
 'SO 
 
 'SO 
 150 
 150 
 15 
 'SO 
 
 150 
 150 
 40 
 150 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 80 
 So 
 So 
 175 
 '75 
 80 
 
 150 
 150 
 '50 
 150 
 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 
 12 
 12 
 12 
 12 
 12 
 12 
 6 
 6 
 6 
 
 6 
 6 
 
 O4, 7)26 
 
 \cid, die, eo-if, foig.[ 
 
 ( g2/Z /I2 3# . . ) 
 
 25-7, 23-0 
 
 24-3 
 3-5 
 
 <6 
 <6 
 <6 
 <6 
 <6 
 <6 
 <6 
 
 -i-5 
 
 <o 
 <o 
 <3 
 <3 
 <o 
 
 <3 
 <3 
 
 <2 
 <0 
 <0 
 <0 
 <0 
 
 1 .0 
 
 0.3 
 
 2.7 
 
 3-4 
 
 3-4 
 
 3-1 
 
 4-1 
 
 ii . i 
 
 20. o 
 26.2 
 
 26.0 
 
 25-4 
 24-4 
 23-9 
 
 20.3 
 
 18.6 
 
 16.7 
 17.1 
 
 '7-3 
 9.0 
 
 8-3 
 6-5 
 6.1 
 
 5-i 
 5-i 
 0-7 
 
 I .2 
 
 -0.8 
 
 <3 
 <i 
 
 9-17 
 12-75 
 
 <I2 
 <I2 
 <I2 
 <I2 
 <I2 
 <I2 
 <I2 
 
 13-7 
 
 <'3 3 
 <i3-3 
 
 <I2.8 
 <I2.8 
 
 <i3-3 
 
 <I2.8 
 <I2.8 
 
 <I3 o 
 
 <i3-3 
 <i3-3 
 <I3 3 
 <i3-3 
 13-50 
 13.28 
 12.89 
 12.77 
 12.77 
 
 12.80 
 12.64 
 
 "-43 
 
 9.92 
 
 8.87 
 
 8.90 
 
 9.00 
 9. 16 
 
 9-25 
 
 9.87 
 10. 16 
 
 10.50 
 10.41 
 10.37 
 11.80 
 
 "93 
 12.25 
 12.30 
 12.46 
 12.46 
 13.21 
 13-15 
 13-47 
 
 <I2.8 
 <I3-2 
 
 good 
 good 
 
 fair 
 good 
 good 
 good 
 good 
 fair 
 good 
 
 good 
 
 good 
 fair 
 poor 
 fair 
 good 
 moon 
 moon 
 fair 
 good 
 good 
 
 
 
 "7 
 194 
 
 O. 12 
 
 + 0.26 
 + 0.06 
 
 
 eij, jzh 
 
 ei-zf. }2h 
 
 
 tfl-4/ fih 
 
 
 jh 
 
 
 erf, jih 
 
 
 ei2f, }i2h 
 
 
 2/, flh . 
 
 
 / g2m, m,2n, n^p .... ) 
 
 
 
 p glimpsed, v not seen . . . 
 
 
 v not seen, limit p 
 
 
 v not seen, limit n 
 
 
 v not seen, limit n 
 
 
 v not seen, limit p 
 
 
 v not seen, limit n 
 
 
 v not seen, limit m or n , 
 
 
 v not seen, limit i<ro. . . . 
 
 
 v not seen, limit p 
 
 
 v suspected, vp? 
 
 
 v not seen, limit 3<n 
 
 
 v not seen, limit 3 < n 
 
 
 good 
 good 
 
 fair 
 good 
 
 good 
 fair 
 
 good 
 
 good 
 good 
 
 good 
 
 good 
 good 
 fair 
 
 good 
 good 
 
 good 
 fair 
 fair 
 fair 
 fair 
 poor 
 fair 
 good 
 good 
 poor 
 fair 
 fine 
 fair 
 good 
 
 279 
 288 
 294 
 
 307 
 312 
 
 360 
 376 
 
 386 
 
 401 
 418 
 
 440 
 
 449 
 
 458 
 462 
 
 473 
 i 
 
 5 
 10 
 
 i? 
 39 
 60 
 
 73 
 81 
 
 94 
 105 
 "3 
 124 
 
 152 
 
 + 0.81 
 + 0.88 
 + 0.61 
 + 0.74 
 + 0.81 
 
 + 1.50 
 + 1-53 
 
 + 0-53 
 0.18 
 
 + 0. 12 
 + 0.39 
 
 + 0.50 
 + 0.53 
 + 0.52 
 
 + 0.90 
 + 0.83 
 
 + 1.08 
 + 0.84 
 + 0.64 
 
 + 1-39 
 + 0.72 
 + 0.62 
 + 0.47 
 + 0.36 
 + O. II 
 + 0.78 
 + 0.65 
 + 0.50 
 
 piv 
 
 
 n2 311, limit v 
 
 
 vn, mi- 2V, limit v 
 
 2.8, 2.6 . . . 
 
 miv, vin, g4~5t> 
 miv, vin 
 
 3-1. 3-8, 3-5 
 ii 18 
 
 miv, vin, gs-6u 
 g3~4U, vin 
 
 3-1, 3-8, 2.5 
 
 4. C, 7.8 
 
 i?3g, di2V, qiv 
 
 ii. o, ii. 6, ii. o "* 
 
 T770T 
 
 v^x, #40, o6-8u 
 uyv, via, 11456, V&-IQX. . . 
 
 u$v, V2t, va, vi2s, 1146 .... 
 
 vis, V2b, ay>, vt, u^-^v.... 
 tyv, a^v, voib, vs 
 
 20.4, 17.1, 22.7 . . 
 
 23.5, 30.7, 25.5, 25.4 
 (22.5, 28.7, 29.7* 
 
 ( 28 . 4, 250.... > 
 
 527.9, 23.0, 26. 7\ 
 
 1 26 7 21 O 
 
 23.7. 25-7, 21.5, 26.9 
 
 24. O 2^ O 
 
 J S2V V2b 642 Z$d ^ 
 
 \_W2d, Z^X X$O, . . . . ) 
 
 )20. 7,19.0, 20.5 \ 
 (21 . 4,2O. I / 
 
 t6v, b2V, i>3y, vyc, v6~8d. . 
 (6511, v^x, 1)2-32 ) 
 
 \Z2X, X2^C, X^j^d ... ) 
 
 16.0, 20.4, 19. 5 . . 
 
 '5-5. 15-5, 17-9, 18.0 
 15.0, 17.0, 18.4, 18.0 
 17.0, 18.4, 16.5 
 10.0, 8.1 
 
 65 6V, ZOIT), VI-2X, t>4C. . . 
 
 b6v, vz, V2x, vyv, X2W. . .. 
 
 VZ, V2X, V2-y 
 V2g, 6211 
 
 ei,v, fi-2g 
 g2V, vyn 
 g2i>, f 3-4n 
 g2-3t>, vin, v6p 
 g3V, vn v$-6p 
 13 411, limit v, m,2v 
 
 m2yv, n2t> 
 
 n4V, po-iv 
 v not seen, limit n 
 
 7-', 9-5 
 6.0, 7.1 
 6.0, 6.3 
 5.5, 3-8, 6.0 
 5-5. 3-8, 6.0 
 
 0.7, 2.1 
 
 1.6, 0.8 
 
 -1.2, -0.5 
 
 v not seen, limit i 2<n. . 
 
 
 
 
82 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 49. 5798 RU HERCUUS. VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 1 
 1 
 I 
 
 < 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 d Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 "Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 53 
 54 
 55 
 56 
 57 
 58 
 59 
 60 
 61 
 62 
 63 
 64 
 
 65 
 66 
 
 67 
 68 
 69 
 70 
 7i 
 72 
 73 
 74 
 75 
 76 
 77 
 78 
 
 79 
 
 80 
 81 
 
 82 
 
 83 
 
 84 
 85 
 86 
 
 7 
 88 
 
 89 
 90 
 
 9" 
 92 
 
 93 
 94 
 95 
 96 
 
 97 
 98 
 
 99 
 
 100 
 IOI 
 
 1 02 
 103 
 104 
 105 
 
 1899 
 Jan. 8 
 10 
 Feb. 15 
 
 Mar. 4 
 
 '9 
 Apr. 4 
 16 
 28 
 May 4 
 18 
 
 29 
 June 3 
 
 13 
 
 19 
 23 
 July 8 
 
 17 
 29 
 Aug. 9 
 
 17 
 26 
 Sept. 4 
 20 
 Oct. 4 
 
 21 
 28 
 
 Nov. 6 
 
 22 
 
 Dec. 14 
 
 1900 
 Jan. 7 
 
 26 
 Feb. 1 8 
 
 24 
 Mar. 7 
 
 21 
 
 Apr. 4 
 18 
 May i 
 
 34 
 June 13 
 
 23 
 July 21 
 
 25 
 Aug. 14 
 Sept. 15 
 Oct. 26 
 Nov. 21 
 
 1902 
 
 Mar. 5 
 
 Apr. 30 
 May 2 
 6 
 Oct. 7 
 
 18 
 18 
 '7 
 J7 
 17 
 15 
 15 
 9 
 9 
 9 
 9 
 9 
 
 9 
 
 9 
 9 
 9 
 9 
 9 
 9 
 9 
 8 
 8 
 7 
 7 
 
 6 
 6 
 
 6 
 
 18 
 
 17 
 15 
 
 13 
 17 
 15 
 II 
 
 15 
 
 12 
 10 
 
 9 
 9 
 ii 
 
 9 
 10 
 
 9 
 
 7 
 6 
 
 H 
 15 
 
 7 
 
 2410000+ 
 4664 . co 
 4666 . oo 
 4701.96 
 4718.96 
 
 4733.96 
 4749.92 
 4761.88 
 4773.63 
 4779.63 
 4793.63 
 4804 . 63 
 4809.63 
 
 4819.63 
 
 4825.63 
 4829.63 
 4844.63 
 4853.63 
 4865.61 
 4876.61 
 4884.61 
 4893-58 
 4902.58 
 4918.54 
 4932 54 
 4949-54 
 4956.50 
 
 4965- 50 { 
 
 4981.50 
 5004.00 
 
 5027.98 
 5046 . 88 
 
 5069.79 
 5075-96 
 5086.88 
 5100.71 
 5114.88 
 5128.75 
 5141-67 
 5164.63 
 5184.63 
 
 5I94-7I 
 5222.63 
 5226.67 
 5246.63 
 5278 
 53I9-54 
 5345-50 
 
 5814-83 
 5824.88 
 5870 
 5872 
 5876 
 6030.54 
 
 200 
 200 
 150 
 
 150 
 150 
 40 
 40 
 40 
 40 
 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 40 
 40 
 150 
 150 
 150 
 
 200 
 
 350 
 
 350 
 80 
 275 
 275 
 275 
 275 
 275 
 275 
 350 
 150 
 ISO 
 80 
 15 
 15 
 
 237 
 237 
 
 237 
 '67 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 40 
 40 
 
 12 
 
 12 
 12 
 12 
 12 
 12 
 12 
 40 
 
 6 
 6 
 
 12 
 
 6 
 6 
 
 6 
 
 40 
 40 
 6 
 40 
 6 
 
 12 
 
 
 
 <5-5 
 -'3 
 9.0 
 
 12.0 
 
 99 
 14.4 
 
 13-7 
 12.9 
 
 15-3 
 '7-5 
 
 22.8 
 
 27.4 
 30.0 
 
 33-9 
 34-9 
 3'-3 
 30.7 
 28.5 
 26.0 
 25-5 
 25-5 
 
 21-7 
 
 19.2 
 16.8 
 14.8 
 14.0 
 
 13.0 
 
 10.8 
 10.5 
 
 4.6 
 
 4-9 
 0.9 
 -0.8 
 
 -2^6 
 1.2 
 -4.1 
 -0.7 
 2.1 
 2-9 
 
 1.8 
 1.8 
 i-9 
 1-3 
 
 3-2 
 
 20.5 
 18.7 
 
 <I2.4 
 
 13-58 
 11.80 
 II .29 
 ii .67 
 10.87 
 10.99 
 
 II . 12 
 
 10-73 
 10.36 
 
 9-44 
 8-65 
 
 8.20 
 
 7-52 
 
 7.36 
 
 7-97 
 8.07 
 8.46 
 8.90 
 8.98 
 8.98 
 9 63 
 10.08 
 10.48 
 10.63 
 10.77 
 
 II . 10 
 
 11.49 
 "-53 
 
 12-57 
 12.50 
 
 13.20 
 13.48 
 13.80 
 13-78 
 13-55 
 14.04 
 
 13-47 
 13-71 
 12.84 
 13.01 
 13.01 
 13.0 
 13.10 
 12.79 
 9-83 
 10.13 
 
 <8. 3 
 7-75 
 9.2 
 9.02 
 9.48 
 <n.6 
 
 fair 
 good 
 good 
 poor 
 good 
 good 
 fair 
 fair 
 good 
 good 
 good 
 good 
 
 good 
 
 fair 
 good 
 good 
 good 
 good 
 fair 
 good 
 good 
 
 good 
 fair 
 fair 
 fair 
 
 fair 
 
 low 
 fair 
 
 good 
 
 fair 
 good 
 good 
 fair 
 good 
 
 poor 
 good 
 moon 
 fair 
 fair 
 good 
 good 
 good 
 good 
 poor 
 
 fair 
 fair 
 
 good 
 
 250 
 286 
 303 
 3i8 
 
 334 
 346 
 358 
 364 
 377 
 388 
 
 393 
 403 
 409 
 
 413 
 428 
 
 437 
 449 
 460 
 468 
 477 
 3 
 J9 
 33 
 50 
 57 
 66 
 
 82 
 105 
 
 129 
 
 148 
 
 171 
 177 
 1 88 
 202 
 216 
 230 
 
 243 
 266 
 286 
 296 
 
 324 
 328 
 
 348 
 379 
 420 
 446 
 
 433 
 443 
 5 
 7 
 ii 
 
 + 0.05 
 0.67 
 0.80 
 
 O.20 
 
 -0-55 
 0.50 
 O.2O 
 -0.56 
 -0.74 
 
 -'44 
 
 2. O2 
 
 -1.66 
 
 -1.82 
 i .64 
 -0.51 
 
 -0-33 
 0.04 
 
 + O.2I 
 
 + o. 14 
 
 O. II 
 + 0.24 
 + 0.28 
 + O.2I 
 
 o. 27 
 
 -0-35 
 -0.32 
 
 -0-34 
 0.69 
 
 + O.O2 
 -0.38 
 
 -0.17 
 + O.O2 
 + O.2O 
 + 0.05 
 -0.25 
 + 0.27 
 
 0.18 
 + 0.63 
 + 0.39 
 + 0.79 
 
 + 1.22 
 
 + i-3 
 + 1.63 
 + 1.69 
 + i .14 
 
 + 1.65 
 
 -o!68 
 
 O.22 
 
 -0.45 
 O.I2 
 
 b i v HA. s,v 
 
 i . o, 1.7 
 
 jiv, vig 
 i?4g, civ, d2V 
 
 VIS dd. $V CAV V2f .. 
 
 9.0, 9.0 
 12. o, 13.0, ii . i 
 9.0, 8.6, 10.0, 12.0 
 14. i, 15.4 
 
 
 vi-zd, xo-iv, z6-?v 
 
 14.6, 15.9, 10.5 . . 
 14.0, 11.9 
 
 Vld, VX, ZI-2V 
 V^d, V2-T,X, ZO-IV 
 
 14.0, 16.4, 15.5 . . 
 17.1, 18.9, 16.5 . . 
 
 22.0, 20.5, 25.9 . . 
 2 4-5, 30.2, 25.0, 29.9 
 32.7, 26.0, 30.9 I 
 29.9 i 
 
 33-4- 35-7, 3i-5 
 36-4- 33-5 
 33-4, 29.7, 31.0 
 30.9, 28.0, 33.2 
 26.9, 27.5, 31.2 
 24.5, 29.7, 24.0 . . 
 27.2, 26.9, 22.5 . . 
 
 26.7, 22. 0, 27.9 . . 
 
 24.7, 19.5, 23.5, 19.0 
 
 I7.O, 21. 0, 21.4, 17.5 
 
 16.0, 17.4, 17.1 . . 
 13.0, 16.4, 15.1 . . 
 14.4, 13.6 
 13.4, 14-1 t 
 
 12. I, 12.5 > 
 
 1 1. 6, 10.0 
 
 
 f v\d vs,b v&s 
 
 \ {4-59, u2-3< 
 liv, v6a, 5 
 V2l, v6Su 
 liv va t>4~ 52* 
 
 /3~4, V2U, 1)3-40 
 
 1"] 8t>, VIU, VI-2O 
 
 02-31), vs, vi-2b 
 ay;, vib, vis 
 a^v, bi-2V, vf>-^z, vi~2a. . 
 b^v, vif, vyc, va. 
 ziv, vtx, 1)40* 
 241;, vx, V2d 
 xiv, vo-id, v very red . . . 
 xzv, vid . . 
 div, 4-5g 
 
 dl2V, D2g 
 V2~~ 3Z 
 
 
 7 O. 4. I. ^ 8 
 
 (g6v vim i?4 . . . . 1 
 
 20 6 I, 6 8 
 
 1 pn u6-8w' w'6t' . . . . / 
 
 0.2, 2.0 
 O 2 I ' 5 . . 
 
 nyv, V2p 
 n$v pi 2V limit v . . 
 
 n6v, pi-2v, v^w', limit w' . 
 n6v, p2v limit 2<v 
 
 -32, -1.5, -3-5 . 
 3-2, 2.O 
 
 713-41), p2-yo, v6-8w' .... 
 nftv p$v , . . 
 
 -0.7, -2.5, -0.5... 
 T 2. S O . . 
 
 nV~ 4.V V< . 
 
 
 n6v, piv 
 
 3.2, I .O 
 
 mil), vn, V2p 
 niv limit v 
 
 3.1, 2.8, 2.0 
 
 I1)4j 
 
 
 niv vsp 
 
 i 8 20 
 
 ni2V limit v .... 
 
 
 g4D, vn, miv, t>3/>? 
 v$-6x, v$z, s6v, 62-31). . . . 
 
 62 IV V21X 
 
 4.0, 2.8, 3.1, 3.0 
 
 21.9, 22.O, 2O.9, 18.5 
 ig c 18 q . 
 
 photometer 
 
 
 photometer . 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photometer. 
 
 
 
 photometer 
 
 
 <IO 
 
 
 
CHAPTER VI. RU HERCUUS. 83 
 
 TABLE 49. 5798 RU HERCULIS. VISUAL OBSERVATIONS OK THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 l_' 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 106 
 
 107 
 
 1 08 
 109 
 no 
 in 
 
 112 
 
 "3 
 114 
 
 116 
 117 
 118 
 119 
 1 20 
 
 121 
 122 
 123 
 
 124 
 
 25 
 126 
 
 127 
 128 
 129 
 
 "30 
 
 132 
 '33 
 134 
 135 
 136 
 '37 
 138 
 '39 
 140 
 141 
 142 
 143 
 
 1903 
 May 17 
 Oct. ii 
 
 1904 
 May 14 
 June 4 
 6 
 8 
 
 July 31 
 
 Aug. 2 
 ii 
 
 13 
 26 
 Sept. 2 
 
 3 
 8 
 8 
 9 
 9 
 Oct. 1 1 
 
 1905 
 Jan. 12 
 Mar. 1 2 
 26 
 Apr. i 
 
 22 
 
 May 2 
 20 
 
 June 20 
 
 24 
 26 
 July 4 
 
 23 
 Aug. 6 
 
 19 
 
 22 
 
 28 
 
 Sept. 17 
 Oct. 20 
 
 22 
 
 9 
 
 7 
 
 13 
 
 12 
 12 
 12 
 
 8 
 9 
 9 
 9 
 
 8 
 8 
 
 7 
 S 
 
 2410000+ 
 6252.63 
 6399-54 
 
 6615.79 
 6636.74 
 6638.76 
 6640 . 74 
 6693.58 
 6695 . 63 
 6704.63 
 6706.63 
 6719.58 
 6726.58 
 6727-54 
 6732-58 
 
 67 
 150 
 
 40 
 
 40 
 67 
 67 
 67 
 40 
 
 67 
 40 
 
 6? 
 
 12 
 
 6 
 
 6 
 24 
 24 
 24 
 6 
 
 12 
 12 
 12 
 6 
 12 
 
 6 
 12 
 
 24 
 24 
 12 
 
 6 
 
 6 
 40 
 40 
 40 
 40 
 40 
 40 
 6 
 40 
 
 12 
 12 
 40 
 40 
 40 
 40 
 40 
 
 6 
 6 
 
 12 
 40 
 
 V2C 
 
 
 i6 
 
 12. 
 
 5-4 
 
 10. 6 
 11.28 
 
 12.40 
 
 12. 3 
 
 n. 9 
 "-37 
 
 II .21 
 
 10. 70 
 
 10.67 
 IO.76 
 10. DO 
 
 9 75 
 9.62 
 9.22 
 
 9-5 
 95 
 
 7-72 
 
 10.35 
 
 fair 
 good 
 
 good 
 
 387 
 268 
 
 -o. 3 
 + 0.32 
 
 0.70 
 
 
 
 giv, vin 
 
 7 O 78 
 
 photograph 
 
 
 photograph 
 
 
 
 good 
 good 
 good 
 good 
 good 
 moon 
 good 
 good 
 fair 
 fair 
 
 fair 
 good 
 
 fair 
 
 292 
 345 
 348 
 357 
 359 
 372 
 379 
 380 
 
 385 
 385 
 386 
 418 
 
 28 
 
 -0-93 
 0.29 
 
 -0-77 
 -0.65 
 
 -0-49 
 0.60 
 
 -'33 
 -1-45 
 -i-73 
 
 -1-85 
 i .04 
 
 + 0.27 
 
 photograph 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 Z2v, ?'4<i 
 
 
 16.0 
 
 photometer 
 
 
 photometer 
 
 
 
 photometer 
 
 
 
 photographs 
 
 
 
 8 
 
 18 
 '3 
 '3 
 
 12 
 IO 
 12 
 IO 
 
 9 
 II 
 
 9 
 
 IO 
 10 
 IO 
 
 9 
 9 
 
 8 
 8 
 7 
 7 
 6 
 
 6733 
 6733 
 6765.58 
 
 6859.00 
 6917.77 
 6931-77 
 6937-75 
 6958-67 
 6968.75 
 6986.67 
 6997.63 
 7017.71 
 7021.63 
 7023.67 
 7031.67 
 7050.67 
 7064.63 
 7077.63 
 7080.58 
 7086 . 59 
 7106.54 
 
 7'39 54 
 7141.50 
 
 '67 
 40 
 
 40 
 237 
 237 
 237 
 237 
 237 
 237 
 200 
 
 237 
 80 
 300 
 237 
 237 
 237 
 237 
 237 
 150 
 150 
 80 
 237 
 
 photographs ) 
 
 
 
 
 /4, v6a 
 v is 1} to 2*>g 
 
 30.0, 35.7 
 13.0, 19.0 
 
 32.8 
 17-5 
 
 giv g5~ 6re 
 
 7.0, 8 ? 
 
 7-4 
 
 7-2 
 
 3-4 
 3-5 
 -0.7 
 -0.8 
 -1.6 
 <3 
 -2.7 
 0.4 
 
 O. I 
 
 -0.6 
 
 2-7 
 
 '5 
 0.8 
 6.9 
 
 3-8 
 
 5-8 
 
 12.08 
 
 12. IO 
 
 12-75 
 
 12.74 
 
 I3-46 
 13.48 
 13.60 
 <I2.8 
 
 13.80 
 13-25 
 13-37 
 13-45 
 
 12.88 
 13 05 
 13.20 
 12. l6 
 
 12.69 
 12.32 
 
 fair 
 fair 
 good 
 good 
 good 
 fair 
 good 
 poor 
 good 
 poor 
 good 
 fair 
 good 
 fair 
 fair 
 fair 
 good 
 fair 
 
 106 
 127 
 137 
 155 
 1 66 
 1 86 
 
 192 
 200 
 219 
 
 233 
 246 
 249 
 255 
 275 
 308 
 310 
 
 0.26 
 
 + O.2O 
 + O. 12 
 + 0.39 
 
 + 0.17 
 
 o.oo 
 
 +0.13 
 0.46 
 0.42 
 
 -0.27 
 
 -o 71 
 0.50 
 -0.23 
 -0.57 
 
 + 0.66 
 + 0.32 
 
 gif r>5 
 
 7078 
 
 g5U, miv, vin 
 gy>, vn 
 
 3.0, 3.1, 3.8 
 5.0, 2.8 
 
 n$v, vp, vioi2iv' . . . 
 
 -2.2, 0.0, (3.5) . 
 O.O, 2.2, 0.5 . 
 -1.2, -2.0, (1.5).. 
 
 g8v, n^v, po-iv 
 
 n^v, p2V, r8iow' 
 v not seen, limit m and n . 
 
 
 n2yv, vSw' 
 
 O3O5 
 
 n2 31), v6 8w' 
 
 O 1 O 5 
 
 
 1.2. O S 
 
 t'o in, m2v 
 
 7721 
 
 niv, my! 
 
 i 8 i i 
 
 n2V, v near limit 
 
 
 gi 2V, v$ 6n . ... 
 
 6583 
 
 gyi, miv, V2n 
 g3~4t>, V2m, i>4 
 
 3.0, 3.1, 4.8 
 4.5, 6.1, 6.8 
 
8 4 
 
 RESEARCHES IN STELT,AR PHOTOMETRY. 
 
 
 
 * 
 
 I 
 
 10 
 
 O 
 O 
 
 FIG. 1 7. LIGHT-CURVE OF RU HBRCUUL. 
 
CHAPTER VI. RU HERCULIS. 
 
 TABLE 50. 5798 RU HERCUUS. MEAN MAGNITUDE FROM 40.25 DAY GROUPS. 
 
 Group No .... 
 J D 
 
 i 
 40 
 
 2 
 80 
 
 3 
 
 121 
 
 4 
 161 
 
 5 
 
 2OI 
 
 6 
 
 241 
 
 7 
 281 
 
 8 
 322 
 
 9 
 
 362 
 
 IO 
 
 402 
 
 ii 
 442 
 
 12 
 483 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3933 [ 
 I No. 
 
 f t 
 
 
 
 9.17 
 
 O. 12 
 
 I 
 
 
 "7 
 12-75 
 + 0.26 
 
 i 
 
 88 
 
 1 18 
 
 194 
 
 13- 7 
 + 0.06 
 i 
 
 
 279 
 13-50 
 + 0.81 
 i 
 
 25O 
 
 300 
 12.93 
 + 0.76 
 4 
 
 102 
 
 360 
 12.80 
 + 1.50 
 i 
 
 346 
 
 388 
 
 ti-33 
 + 0.63 
 
 3 
 380 
 
 429 
 8.88 
 + 0.26 
 
 2 
 418 
 
 460 
 9-32 
 
 0.61 
 4 
 
 464 
 
 * I 
 
 I No. 
 
 4899 -j ^ 
 L No. 
 
 r t 
 
 10.65 
 + 0.96 
 
 5 
 
 18 
 10.28 
 + 0.24 
 3 
 
 58 
 10.83 
 -0.31 
 
 3 
 
 12.49 
 + 0.57 
 6 
 
 94 
 11.51 
 -0.52 
 
 2 
 
 13 31 
 + 0.58 
 
 2 
 
 138 
 12.54 
 
 -0.18 
 
 2 
 
 179 
 '3 49 
 
 + O.O2 
 
 3 
 
 216 
 13-79 
 
 + O.O2 
 
 3 
 
 13.58 
 + 0.05 
 
 I 
 
 254 
 
 13 59 
 
 + O.22 
 2 
 
 ii 59 
 0.56 
 
 3 
 
 291 
 12.92 
 + 0.59 
 
 2 
 
 10.99 
 0.42 
 3 
 
 333 
 13-04 
 + 1-38 
 3 
 
 9.80 
 -1.18 
 
 4 
 
 379 
 12.79 
 + 1.69 
 i 
 
 7.82 
 -I.I9 
 
 5 
 
 420 
 9-83 
 + i. 14 
 i 
 
 433 
 
 8.83 
 + 0.05 
 4 
 
 446 
 10.13 
 + 1-65 
 
 i 
 
 443 
 
 M 
 
 
 
 
 
 
 
 
 
 
 
 8 ? + 
 
 7 , 7C 
 
 5382 \ JM - 
 
 
 
 
 
 
 
 
 
 
 
 
 -0.68 
 
 No 
 
 
 
 
 
 
 
 
 
 
 
 i 
 
 i 
 
 r f 
 
 g 
 
 
 
 
 
 
 
 
 
 -587 
 
 
 
 I M 
 
 924. 
 
 
 
 
 
 
 
 
 
 to. 6 
 
 
 
 5 86 5 j JM 
 
 
 
 
 
 
 
 
 
 
 0.30 
 
 
 
 L No 
 
 
 
 
 
 
 
 
 
 
 i 
 
 
 
 r < 
 
 
 1 
 
 
 
 
 
 268 
 
 2Q2 
 
 352 
 
 380 
 
 418 
 
 
 
 
 11.28 
 
 
 
 
 
 12.40 
 
 11.^7 
 
 10.58 
 
 9.65 
 
 7.72 
 
 
 6 348 j ^M 
 
 
 4-n 12 
 
 
 
 
 
 O 7O 
 
 O Q"* 
 
 0.55 
 
 i .39 
 
 i .04 
 
 
 t No 
 
 
 I 
 
 
 
 
 
 I 
 
 I 
 
 4 
 
 5 
 
 i 
 
 
 r t 
 
 28 
 
 
 
 
 
 
 
 
 
 
 
 
 J M 
 
 
 
 
 
 
 
 
 
 
 
 
 
 68 3' j JM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 (. No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r / 
 
 Means] ^ 
 L No. 
 
 H 
 9.61 
 
 + 0.21 
 13 
 
 54 
 ii .06 
 
 0.00 
 
 4 
 
 IOO 
 12.25 
 + O. IO 
 
 9 
 
 138 
 12.62 
 + 0.20 
 
 4 
 
 1 86 
 13.60 
 + 0.04 
 4 
 
 2l6 
 
 13-79 
 
 + O.O2 
 
 3 
 
 26 3 
 I3-27 
 + O. IO 
 
 5 
 
 296 
 12. 19 
 + 0.04 
 IO 
 
 348 
 11.71 
 + 0.48 
 ii 
 
 38i 
 11.03 
 
 O.II 
 
 14 
 
 424 
 8.56 
 
 O.2I 
 IO 
 
 456 
 8.63 
 + 0.41 
 
 IO 
 
 TABLE 51. 5798 RU HBRCULIS. OBSERVED MAXIMA AND MINIMA. 
 
 Elements of maximum. 1898 March 6 O. D. 24143S5)+483<1 E. M - m = 217*. 
 
 MAXIMA. 
 
 MINIMA. 
 
 t 
 
 W 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 J3 
 
 1 
 W 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 i 
 
 2 
 
 3 
 4 
 5 
 6 
 
 1898 Mar. 13 
 1899 June 23 
 1900 Nov. 2 
 1902 Mar. ii 
 1903 June 28 
 1904 Oct. 16 
 
 4362 
 4829 
 5326 
 5820 
 6294 
 6770 
 
 8.85 
 7-40 
 9-77 
 
 9. 12 
 
 7.67 
 10.04 
 
 me 
 me 
 7-97 
 
 + 7 
 - 9 
 + 5 
 
 + 10 
 
 + 7 
 
 
 
 '3 
 16 
 
 7 
 
 2 
 
 3 
 
 12 
 
 i 
 
 2 
 
 3 
 5 
 6 
 
 1897 Aug. 30 
 1898 Nov. 9 
 1900 Apr. 15 
 1902 Nov. 26 
 1904 Feb. 28 
 
 4167 
 4603 
 
 51^5 
 6080 
 6540 
 
 13.90 
 13-70 
 13.86 
 
 14.17 
 13 97 
 I4-I3 
 me 
 14.0 
 
 + 29 
 -18 
 
 + 21 
 + 10 
 
 -13 
 
 IO 
 
 25 
 23 
 i 
 6 
 
 13-7 
 
86 
 
 RESEARCHES IN STEU,AR PHOTOMETRY. 
 
 zoo 
 
 30O 40O SOO 
 
 5798 RUHERCULIS 
 
 Max 435 
 Min.. . 
 
 10 
 
 kl 
 
 a 
 " 
 
 FIG. 1 8. MEAN LIGHT-CURVE OF RU HERCULIS. 
 
CHAPTER VII. 
 
 6100 RV HERCULIS. 
 R. A. i6l 56" 45; Dec. + 31 22' 18" (1900). 
 
 This variable was also discovered by Anderson, and observations began 
 immediately after the receipt of the announcement in 1897. It was then rapidly 
 fading and passed below the limit of the 6-inch, October i, and remained below 
 that limit till 1898 January 18. The following maximum was well fixed as 1898 
 March 15, at magnitude 10.50 on the Harvard scale. The succeeding minimum 
 was observed with the 12-, 24-, and 4o-inch telescopes, the last by the courtesy 
 of Professor Barnard. The four following maxima were well covered by observa- 
 tions, and the minima of epochs 4, 5, and 12; with sufficient comparisons in 
 the intervening time to make sure of the number of the epoch, and to give some 
 idea as to how closely the star was following the mean light-curve. 
 
 The positions of the variable and the brighter comparison stars were measured 
 with the 6-inch in August, 1897, the fainter stars (those with the Greek letters, 
 also k and P) were measured with the 4O-inch in June, 1900. 
 
 The photometric measures of the stars brighter than the rath magnitude 
 are more closely accordant than usual, the fainter stars less accordant. The 
 difference between the Harvard and Potsdam systems for the three standard 
 stars used is 0.25, which is just the mean of the magnitude difference for the 
 twelve fields considered. 
 
 TABLE 52. 6100 RV HERCULIS. STANDARD MAGNITUDE STARS. 
 
 
 
 1900. 
 
 
 Magnitude. 
 
 Residuals. 
 
 Star. 
 
 B. D. No. 
 
 R. A. 
 
 Dec. 
 
 Color 
 P. DM. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nights 
 
 
 
 
 
 
 
 
 
 
 
 
 H.C.O. 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 inter 
 
 
 
 
 
 
 
 
 
 
 
 
 se. 
 
 
 o 
 
 - h m s 
 
 / 
 
 
 
 
 
 
 
 
 
 B 
 
 + 29 2924 
 
 16 58 36 
 
 + 29 26.0 
 
 W + 
 
 7-5' 
 
 7.92 
 
 7.68 
 
 7-93 
 
 + '7 
 
 + i 
 
 4 
 
 F 
 
 +32 2835 
 
 16 58 31 
 
 + 32 02. o 
 
 WG 
 
 6-34 
 
 6.62 
 
 6-37 
 
 6.62 
 
 + 3 
 
 o 
 
 5 
 
 G 
 
 + 31 2967 
 
 17 04 12 
 
 + 31 20.4 
 
 WG- 
 
 6.61 
 
 6.66 
 
 6.41 
 
 6.66 
 
 20 
 
 o 
 
 o 
 
 
 Means 
 
 
 
 
 6.82 
 
 7.07 
 
 6.82 
 
 7.07 
 
 13 
 
 
 
 3 
 
 
 
 
 
 TABLE 53. COMPARISON STARS IN B. D. CATALOGUE- 
 
 
 B. D. 
 
 1855- 
 
 star. 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 - 
 
 o 
 
 
 h m s 
 
 o / 
 
 b 
 
 + 31 2949 
 
 9.2 
 
 16 54 49 
 
 + 31 18.6 
 
 e 
 
 + 3' 295 
 
 8.6 
 
 16 55 58 
 
 + 31 26.8 
 
 87 
 
88 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 54. COMPARISON STARS FOR RV HERCULIS (IN ORDER OF RIGHT ASCENSION). 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 / 
 r 
 n 
 u 
 f 
 
 b 
 
 
 a 
 i 
 
 Y 
 
 m 
 s 
 k 
 P 
 
 a 
 
 I 
 
 
 
 I 
 d 
 
 w 
 
 X 
 
 P 
 
 t 
 1 
 
 e 
 
 ft 
 
 -346 
 -301 
 184 
 -150 
 -147 
 
 146 
 -137 
 
 122 
 
 -"3 
 - 86 
 
 - 76 
 - 67 
 + 88 
 + 104 
 + H3 
 
 + 133 
 
 + 133 
 + 176 
 + 181 
 + 186 
 
 + 34 
 + 366 
 
 + 344 
 + 498 
 
 + 727 
 
 i- 
 -27.0 
 
 -23.5 
 -14.4 
 -11.7 
 -"5 
 
 -11.4 
 -10.7 
 
 - 95 
 
 - 8.8 
 
 - 6.7 
 
 - 5-9 
 - 5-2 
 + 6.9 
 
 + 8.2 
 
 + 8.8 
 
 + 10.4 
 + 10.4 
 + 13.7 
 + 14.4 
 + 14-5 
 
 + 26.6 
 + 28.6 
 + 26.9 
 
 + 38.9 
 + 56.8 
 
 rt 
 + 92 
 + 32 
 + 283 
 -332 
 - 52 
 
 461 
 + 46 
 + 69 
 + 128 
 + 49 
 
 + 396 
 -154 
 + 35 
 + 44 
 + 176 
 
 + 4 
 + 247 
 + 475 
 + 527 
 422 
 
 -475 
 + 151 
 
 212 
 + III 
 + 56 
 
 37-2 
 33-3 
 
 10.86 
 ii .67 
 
 "'2 
 II.9 
 
 
 
 35-8 
 
 IO.O 
 
 44.6 
 
 12.28 
 >4-75 
 
 9.89 
 
 12. 5 3 
 
 15 oo 
 10. 14 
 
 
 
 
 
 
 15-7 
 
 14.26 
 
 14.51 
 
 
 
 
 
 
 
 
 27-3 
 8.5 
 14-5 
 
 12.67 
 15.50 
 14-95 
 
 12.92 
 
 15.75 
 15.20 
 
 
 
 11.4 
 33-4 
 25.3 
 39-8 
 
 15-22 
 ii .46 
 
 10.67 
 
 15.47 
 11.71 
 
 10.92 
 
 13. o 
 
 II ,O 
 
 12. O 
 12.25 
 12.91 
 
 11.48 
 
 i3-3 
 '. 3 
 
 12. 3 
 12.50 
 13. 16 
 "73 
 
 
 
 
 3 3 
 26.0 
 35-0 
 51-2 
 
 8.86 
 
 9.11 
 
 TABLE 55. 6100 RV HERCULIS. PHOTOMETER MEASURES OF COMPARISON STARS. 
 
 1904 July 31. 6-INCH. Fine. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 -> 
 
 
 
 
 
 
 
 
 17 38 
 
 13 
 
 F.i 
 
 8.0 9.3 8.9 
 
 8.70 
 
 9.89 
 
 O.27 
 
 7-14 
 
 7-39 
 
 
 
 e 
 
 21 .O 21-4 21.2 
 
 21 .20 
 
 22.22 
 
 J-85 
 
 8.72 
 
 8-97 
 
 
 
 d 
 
 40.8 41.3 4I.I 
 
 41.07 
 
 40.64 
 
 3-91 
 
 10.78 
 
 11.03 
 
 
 
 ) 
 
 44-2 43-7 44-i 
 
 44.00 
 
 43-40 
 
 4.14 
 
 ii .01 
 
 n .26 
 
 
 
 b 
 
 31.9 31.2 31.2 
 
 31-43 
 
 31.72 
 
 2.89 
 
 9.76 
 
 10. OI 
 
 
 
 B 
 
 14.0 14.5 13.8 
 
 14. 10 
 
 14-35 
 
 0.83 
 
 7.70 
 
 7-95 
 
 
 17 
 
 Bai 
 
 19.0 19.3 18.3 
 
 18.87 
 
 19.32 
 
 I-5I 
 
 8.38 
 
 8.63 
 
 
 
 Gai 
 
 9.8 9.2 10.0 
 
 9.67 
 
 IO.O2 
 
 O.29 
 
 7.16 
 
 7-41 
 
 
 I e 
 
 G a 
 
 10 7 98 10.6 
 
 IO-37 
 
 
 
 
 
 
 
 
 19 2 19.9 2O . 2 
 
 19.77 
 
 
 
 
 
 
 
 B 
 
 15.0 14.2 14.6 
 
 14.60 
 
 
 
 
 
 
 
 b 
 
 31 7 -33 ^ "^2.1 
 
 32 .03 
 
 
 
 
 
 
 
 I 
 
 41 O 4.2 . 2 4.1 . 2 
 
 42.80 
 
 
 
 
 
 
 
 'd 
 
 39 . 2 40 . 8 40 . 6 
 
 4O.2O 
 
 
 
 
 
 
 
 
 27 7 2?. 1 22.7 
 
 23. 23 
 
 
 
 
 
 18 4 
 
 18 
 
 F a , 
 
 II . I 11.2 10.9 
 
 II .07 
 
 
 
 
 
 
 
 
 
STELLAR PHOTOMETRY. 
 + im 
 
 N 
 
 PLATE 7. 
 
 
 
 + 2O 
 
 2950 
 
 d." 
 .1 
 
 .7 
 a 
 
 
 
 o' 
 
 w 
 
 I. 
 
 Scale, i mm = i3*.8. 
 
 I 
 
 6100 RV HERCULIS. 
 R. A. i6h 56" 44 s. 7> Dec. +31 22' 18", 1900. 
 
 1904 July i. 
 
CHAPTER VII. RV HERCUUS. 
 
 89 
 
 TABLE 55. 6100 RV HERCUUS. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1904 September 4. 6-INCH. Fair, quiet, dull. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 19 26 
 
 19 45 
 
 O 
 
 32 
 
 34 
 35 
 33 
 
 36 
 35 
 
 36 
 
 F . 
 e 
 d 
 
 t 
 b 
 B 
 Ga\ 
 Gai 
 
 B 
 b 
 
 d 
 e 
 F . 
 
 9.1 10.1 10.1 
 23.9 24.1 24.4 
 44.9 43.4 44.2 
 45.8 46.1 45.1 
 32.5 31.6 31.4 
 15.9 16.1 15.1 
 11.7 11.9 ii .6 
 
 12. I II .2 12.2 
 
 16.3 15.9 16.0 
 
 32-1 3'-5 32-2 
 
 45-4 44-3 45 2 
 46 . i 46 . 2 46 . 3 
 26 . 2 26 . 7 26 . i 
 11.7 11.9 11.9 
 
 9-77 
 24-13 
 44-17 
 45-67 
 31-83 
 I5-70 
 u-73 
 11.83 
 16.07 
 31-93 
 44-97 
 46.20 
 26.33 
 11.83 
 
 10.80 
 25-23 
 45-19 
 45-32 
 31-88 
 
 15-89 
 
 11.78 
 
 o.37 
 2.16 
 
 4-3i 
 4-32 
 2.91 
 1.07 
 0.48 
 
 7-05 
 8.84 
 10.99 
 ii .00 
 9-59 
 7-75 
 7.16 
 
 7-3 
 9.09 
 ii .24 
 11.25 
 9.84 
 8.00 
 7-4' 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 September 5. Good, somewhat dull. 
 
 18 40 
 19 i 
 
 24 
 
 26 
 
 27 
 27 
 
 28 
 28 
 
 28 
 
 Fa. 
 e 
 d 
 
 b 
 B 
 
 Gai 
 Gai 
 
 B 
 b 
 
 f d 
 e 
 Fa. 
 
 9.2 9.7 9.0 
 
 22. O 22.3 22.9 
 
 40-9 4i-3 4'-5 
 43-i 43-2 42-5 
 29.7 29.9 29.8 
 13-3 H-O "3-9 
 9-3 9-9 9-3 
 
 IO.O 9.8 IO.2 
 
 13-5 13-3 '3-4 
 29.0 28.6 28.8 
 
 42-3 43-0 42-9 
 39.8 40.7 40.9 
 
 21.9 22-4 22. 2 
 10.5 10.2 10. I 
 
 9-3 
 
 22.40 
 
 41-23 
 42-93 
 29.80 
 
 13-73 
 9-50 
 
 IO.OO 
 
 13-40 
 28.80 
 
 42.73 
 40.47 
 
 22. 17 
 IO.27 
 
 9-79 
 22.29 
 40.85 
 42.83 
 29.30 
 
 13.57 
 9-75 
 
 0.28 
 1.86 
 
 3-93 
 4.11 
 2.62 
 
 0.73 
 o. 26 
 
 7-18 
 8.76 
 10.83 
 ii .01 
 9-52 
 7-63 
 7.16 
 
 7-43 
 9.01 
 11.08 
 ii . 26 
 
 9-77 
 7.88 
 
 7-4i 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 August ii. 12-INCH. Good. 
 
 18 42 
 
 18 53 
 19 7 
 
 19 18 
 
 23 
 
 25 
 
 28 
 
 29 
 
 b 
 
 u 
 r 
 
 i 
 
 s 
 
 
 
 d 
 e 
 e 
 d 
 o 
 s 
 
 f 
 r 
 u 
 b 
 
 27-5 27.5 26.6 
 52.4 51-5 52.5 
 
 43.2 44.3 43-7 
 36.7 37-1 37-2 
 55-9 57-0 56-4 
 41.9 42.2 43.0 
 35 9 36-7 36-1 
 18.2 17.6 17.4 
 18.2 18.1 17.5 
 35-9 35-9 35-7 
 42-9 43-3 43-2 
 57-5 57-7 57-2 
 37-7 38-9 38-2 
 44-o 45-5 44-9 
 51.3 51.2 51.1 
 29.3 28.2 28.8 
 
 27.20 
 52.13 
 
 43-73 
 37-oo 
 
 56.43 
 42-37 
 36-23 
 17-73 
 '7-93 
 35-83 
 43-13 
 57-47 
 38-27 
 44.80 
 51.20 
 28.77 
 
 27.99 
 51-67 
 44-31 
 37-64 
 56.95 
 42-75 
 36-03 
 
 17-83 
 
 2-45 
 4.96 
 
 4-25 
 3-50 
 5-35 
 4.07 
 
 3-3' 
 '43 
 
 9-85 
 12.36 
 11.65 
 10.90 
 
 12.75 
 11.47 
 10.71 
 8.83 
 
 10.09 
 12.60 
 11.89 
 ii . 14 
 
 12-99 
 11.71 
 10.95 
 9.07 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
90 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 55. 6100 RV HERCULIS. PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1904 August 13. 12-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings- 
 
 MeanScale Readings- 
 
 c. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6- 
 
 H. 
 
 p. 
 
 h m 
 19 38 
 
 19 58 
 
 O 
 
 33 
 
 37 
 
 b 
 u 
 r 
 
 } 
 s 
 o 
 d 
 e 
 e 
 d 
 o 
 s 
 
 ! 
 
 r 
 u 
 b 
 
 3i-3 32.5 32-4 
 56.7 56.1 55.9 
 49.0 48.4 49.7 
 42.5 41.6 42.2 
 60. i 59.0 58.7 
 45.8 46.5 48.0 
 40 . o 40 . i 39 . 6 
 20.1 20.3 19.2 
 20.4 19.8 20. 6 
 
 37-i 38-3 38.5 
 44-8 45.9 45.0 
 57.6 59.2 60.3 
 39-9 40.9 40.2 
 47 .0 48.9 48. 2 
 57.8 56.8 57.0 
 33.0 32.8 33.6 
 
 32.07 
 56.23 
 49-03 
 42. 10 
 59-27 
 46.77 
 39-90 
 19.87 
 20. 27 
 37-97 
 45-23 
 59-03 
 40.33 
 48.03 
 57-20 
 33-13 
 
 32.60 
 56.72 
 48.53 
 
 41 .22 
 
 59-15 
 46.OO 
 
 38.94 
 2O.O7 
 
 2-93 
 5-33 
 4-67 
 3-9 
 5-45 
 4.42 
 3 65 
 1.72 
 
 9 95 
 12.35 
 ii .69 
 10.93 
 12.47 
 11.44 
 10.67 
 8-74 
 
 10. 19 
 
 12.59 
 
 "93 
 11.17 
 12.71 
 11.68 
 10.91 
 8.98 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 September 8. Quiet, dull, fair to good. 
 
 20 35 
 
 21 O 
 
 44 
 
 b 
 u 
 r 
 
 f 
 s 
 o 
 
 d 
 
 e 
 e 
 d 
 
 
 
 s 
 
 i 
 
 r 
 u 
 b 
 
 20. i 20.9 20.7 
 41 .9 42.6 41.8 
 38.6 39.2 38.4 
 29.8 30.7 30.2 
 48 . 3 48 . i 48 . 2 
 37-3 37-2 38.0 
 29.7 29.4 29.8 
 14.0 14.7 15.0 
 15.2 14.4 15.0 
 30.5 29.2 30.2 
 36-2 37-3 38.0 
 51.1 50.2 49.8 
 30.8 32.8 32.1 
 38.5 40.6 39.5 
 45.0 44.1 44.0 
 
 22.9 22.9 22. I 
 
 20.57 
 42. 10 
 
 38-73 
 30-23 
 48.20 
 37-50 
 29-63 
 14-57 
 14.87 
 29.97 
 37-17 
 50.37 
 31.90 
 
 39-53 
 
 44-37 
 22.63 
 
 21 .60 
 43-24 
 39-13 
 31-07 
 49.29 
 37-32 
 29.80 
 14.72 
 
 1.88 
 
 4-13 
 3-68 
 2.76 
 4.78 
 3-46 
 2-63 
 i .01 
 
 9.88 
 12.13 
 11.68 
 10.76 
 12.78 
 ii .46 
 10.63 
 9.01 
 
 IO. 12 
 
 12.37 
 II .92 
 II .00 
 
 13.02 
 
 II . 70 
 
 10.87 
 9-25 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1900 June 8 40-INCH, WEDGE II. 
 
 12 45 
 13 15 
 
 
 P 
 s 
 ft 
 i 
 r 
 
 50 . 9 46 . 8 47 . 2 48 . i 
 28.1 28. i 26.2 29.5 
 47.1 44.3 46.5 44.6 
 40.9 41.7 40.0 42.3 
 
 21 .O 2O. 2 2O. 8 21 .5 
 
 48-25 
 27.98 
 45-63 
 
 41-23 
 20.88 
 
 
 4.82 
 2.62 
 
 4-57 
 4.07 
 1.63 
 
 14-87 
 12.67 
 14.62 
 
 14. 12 
 
 11.68 
 
 15.12 
 12.92 
 
 14.87 
 14-37 
 
 "-93 
 
 
 
 
 
 
 1900 July 12. 
 
 18 45 
 
 
 s 
 
 V 
 
 1 
 
 / 
 
 r 
 
 a 
 O 
 
 27.O 24.0 26.O 29.3 
 24.4 24.1 23.9 25.0 
 44.0 43.9 41.8 43.7 
 12-5 13.8 15.2 14.1 
 22-4 21 . I 21 .7 2O.9 
 32.2 32.0 32.2 34.2 
 
 20.4 20. 8 22.8 20. o 
 
 26.58 
 24-35 
 43-35 
 13.90 
 
 21-53 
 32-65 
 
 21. OO 
 
 
 2-45 
 2.14 
 4-32 
 0.52 
 1.74 
 3-iS 
 1.67 
 
 12.52 
 
 12.21 
 14-39 
 
 10-59 
 11.81 
 13.22 
 11.74 
 
 12.77 
 12.46 
 14.64 
 10.84 
 12.06 
 
 13-47 
 11.99 
 
 
 
 
 
 
 
CHAPTER VII. RV HERCULIS. 
 
 TABLE 55. 6100 RV HERCUUS. PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1900 August 30. 40-INCH, WEDGE II. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 19 6 
 
 19 46 
 
 
 / 
 r 
 
 s 
 i 
 P 
 k 
 P 
 i 
 
 
 
 1 
 
 ft 
 
 P 
 
 S 
 s 
 r 
 
 f 
 
 8.0 14.2 13.2 
 23.4 22.5 23.0 
 26.5 27.5 26.3 
 
 55-5 54-4 53-5 
 51.3 50.9 50.7 
 
 57-3 57-8 59-i 
 45.8 48.2 48.0 
 45.0 44.8 44.2 
 53-8 53-2 50.9 
 41.8 43.5 42.2 
 
 46 . I 48 . 2 47.O 
 
 53- 1 55-2 56.9 
 50.8 48.8 50.2 
 52.6 52.9 53.0 
 27-3 26.5 25.6 
 18. i 18.6 21 .0 
 12.9 16.5 15.0 
 
 11.80 
 22.97 
 26.77 
 54-47 
 50-97 
 58.07 
 
 47-33 
 44.67 
 52-63 
 42.50 
 47.10 
 55-07 
 49-93 
 52.83 
 26.47 
 19.27 
 14.80 
 
 13-30 
 
 21 . 12 
 26.62 
 53-65 
 50-45 
 56.57 
 47-22 
 
 43-59 
 
 o 45 
 1.70 
 
 2-47 
 5-23 
 
 5-02 
 
 5-45 
 4-73 
 4-35 
 5-17 
 
 10.64 ' 
 11.89 
 12.66 
 15-42 
 15.21 
 15-64 
 14.92 
 
 14-54 
 15-36 
 
 10.89 
 12 . 14 
 12.91 
 I5.67 
 I5-46 
 15.89 
 15.17 
 14-79 
 I5.6I 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1900 September 13. Air quiet, seeing good. 
 
 19 6 
 
 19 45 
 
 1 
 
 
 u 
 s 
 
 } 
 
 r 
 
 ft 
 
 e 
 
 
 
 n 
 
 a 
 
 i 
 P 
 k 
 P 
 S 
 V 
 
 a 
 
 1 
 P 
 
 r 
 
 1 
 
 s 
 u 
 
 23.8 24.4 22. O 
 26.2 27.1 27.3 
 
 15.8 16.8 16.8 
 
 2O. 8 21.5 22. 2 
 
 46 . i 46 . 2 47 . i 
 
 48 . 2 
 
 49 2 
 
 23.40 
 26.87 
 16.47 
 
 21 . 50 
 46.47 
 48.2 
 
 49-2 
 40.50 
 
 32.13 
 19.60 
 50.90 
 46.83 
 55.67 
 49-03 
 50.60 
 46.90 
 
 '9-43 
 31.90 
 40.50 
 48.50 
 22.83 
 
 17.57 
 29.27 
 
 25.73 
 
 24-57 
 28.07 
 17.02 
 22.17 
 47-49 
 
 2.18 
 2.64 
 1.03 
 1.83 
 4-75 
 4-8 
 
 4-9 
 4.00 
 3.10 
 '43 
 5-04 
 4.80 
 
 5-4 
 
 12.15 
 
 12. 6l 
 
 II .00 
 11.80 
 14.72 
 
 14. 8 
 14. 9 
 13-97 
 13-07 
 II .40 
 15.01 
 14-77 
 15-37 
 
 12.40 
 12.86 
 11.25 
 12.05 
 
 H-97 
 i5-0 
 
 15- 1 
 14.22 
 
 13-32 
 11.65 
 15-26 
 15.02 
 15.62 
 
 40.50 
 32.01 
 19-51 
 50.75 
 47-93 
 
 40-5 41-5 39-5 
 31.0 32.2 33.2 
 20 . o 1 8 . 8 20 . o 
 
 48.5 51-9 53-2 
 46.8 46.2 47.5 
 54-9 57-0 55-i 
 48.9 49.9 48.3 
 50.2 50.4 51.2 
 45 . 9 46 . o 48 . 8 
 20. i 18.2 20. o 
 
 31-9 3i-5 32-3 
 40.2 40.3 41 .0 
 48 . i 48 . 9 48 . 5 
 21-5 23.9 23.1 
 18.9 17.6 16.2 
 30.0 28.8 29.0 
 25.5 26.5 25.2 
 
 
 
 
 
 
 
 4.70 
 
 14.67 
 
 14.92 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 56. 6100 RV HERCUUS. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 1904 July 31. 
 
 1904 September 4. 
 
 1904 September 5. 
 
 Star. 
 
 C. 
 
 Obs. Mag. 
 
 H. P. 
 
 Mag. 
 
 H. 
 
 P. 
 
 C. 
 
 Obs. Mag. 
 
 H. P. 
 
 A Mag. 
 
 H. 
 
 C. 
 
 Obs. Mag. 
 
 H. 
 
 P. 
 
 J Mag 
 
 H. 
 
 P. 
 
 B 
 
 F 
 
 G 
 
 0.80 
 -0.48 
 -0.46 
 
 7.67 
 6-39 
 6.41 
 
 7.92 
 6.64 
 6.66 
 
 + .16 
 + 05 
 .20 
 
 Means. 
 M.. 
 
 0.05 
 
 6.82 
 6.87 
 
 7.07 
 7.12 
 
 .00 
 
 + .02 
 .OO 
 
 .01 
 
 1.07 
 -0.38 
 -0.27 
 
 7-75 
 6.30 
 6.41 
 
 8.00 + .24 
 6.55!- -04 
 6 . 66 - . 20 
 
 + .08 
 -.07 
 
 0.73 
 -0.47 
 -0.49 
 
 7.63 
 6-43 
 6.41 
 
 6.68 
 6.66 
 
 + .12 
 + .09 
 .20 
 
 - .04 
 
 + .06 
 
 .OO 
 
 o. 14 
 
 6.82 
 
 6.68 
 
 7.07 .16 
 6 93 
 
 .05 
 
 0.08 
 
 6.82 
 6 90 
 
 7.07 
 7-15 
 
 14 
 
 .03 
 
 12-INCH. 
 
 40-INCH. 
 
 Star. 
 
 Mean C . . . . 
 Mean Mag. 
 
 Mag. 
 6-inch. 
 
 9.62 
 10.87 
 
 8.77 
 ii .01 
 
 10.07 
 
 C. 
 
 Aug. ii. Aug. 13. Sept. 8 
 
 2-45 
 3 3i 
 i-43 
 3-50 
 
 2.67 
 
 10.07 
 
 7.40 
 
 2-93 
 3.65 
 1.72 
 
 3-91 
 
 3.05 
 
 10.07 
 
 7.02 
 
 Star. 
 
 1.88 
 2.63 
 
 I.OI 
 
 2.76 
 
 2.07 
 
 10.07 
 
 8.00 
 
 Mean C . . 
 Mean Mag 
 
 M n . 
 
 Mag. 
 i 2-inch. 
 
 10.86 
 11.46 
 it .67 
 12.67 
 12.28 
 
 C. 
 
 June 8. July 12. Aug. 30. Sept. 13 
 
 i 63 
 2.62 
 
 2. 12 
 12.17 
 10.05 
 
 0.52 
 !.6 7 
 '74 
 2-45 
 
 I. 60 
 II .67 
 IO.O7 
 
 0.45 
 
 1.70 
 
 2.47 
 
 1-54 
 
 "73 
 10. 19 
 
 1.03 
 
 2.64 
 2.18 
 
 i .92 
 
 11.87 
 
 9-95 
 
CHAPTER VII. RV HERCUUS. 
 
 93 
 
 TABLB 57. 6100 RV HERCUUS. MEAN MAGNITUDES OF COMPARISON STARS. 
 
 6 INCH. 
 
 Star. 
 
 July 31. 
 
 Sept. 4. 
 
 Sept. 5. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 J 
 
 Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 B 
 
 7.67 
 6 39 
 6.41 
 
 O.OI 
 + O.O2 
 
 o.oo 
 
 7-75 
 6.30 
 6.41 
 
 + 0.07 
 0.07 
 O OO 
 
 7-63 
 6-43 
 6.41 
 
 0.05 
 + 0.06 
 o.oo 
 
 7.68 
 
 6-37 
 6.41 
 
 7-93 
 6.62 
 6.66 
 
 0.04 
 0.05 
 o.oo 
 
 F 
 
 G 
 
 Mean 
 
 6.82 
 
 7.07 
 
 0.03 
 
 b. . 
 
 9.76 
 10.78 
 8.72 
 ii .01 
 
 +o. 14 
 0.09 
 0.05 
 o.oo 
 
 9-59 
 10.99 
 8.84 
 ii .00 
 
 0.03 
 
 + O.I2 
 + O.O7 
 O.OI 
 
 9-52 
 10.83 
 8.76 
 ii .01 
 
 O. IO 
 
 0.04 
 
 O.OI 
 
 o.oo 
 
 9. 62 
 10.87 
 
 8.77 
 ii .01 
 
 9.87 
 
 II . 12 
 9.O2 
 II .26 
 
 0.09 
 0.08 
 0.04 
 
 0.00 
 
 d 
 
 e 
 
 /. . 
 
 
 10.07 
 
 10.32 
 
 0.05 
 
 
 
 
 
 
 
 
 12-INCH. 
 
 Star. 
 
 Aug. ii. 
 
 Aug. 13. 
 
 Sept. 8. 
 
 Mean. 
 
 Mag. 
 
 JUag, 
 
 Mag. 
 
 J 
 
 Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 j, 
 
 9-85 
 10.71 
 8.83 
 10.90 
 
 0.04 
 + 0.04 
 0.03 
 
 + 0.04 
 
 9-95 
 10.67 
 
 8-74 
 10.93 
 
 + 0.06 
 o.oo 
 
 O. 12 
 + 0.07 
 
 9.88 
 10.63 
 9.01 
 10.76 
 
 O.OI 
 
 0.04 
 
 +0.15 
 
 O.IO 
 
 9.89 
 10.67 
 8.86 
 10.86 
 
 10. 14 
 10.92 
 9.11 
 ii.ii 
 
 0.04 
 0.03 
 o. 10 
 0.07 
 
 j 
 
 
 / 
 
 Mean 
 
 10.07 
 
 10.32 
 
 0.06 
 
 
 11.47 
 11-65 
 12-75 
 12.36 
 
 + O.OI 
 O.O2 
 4-0.08 
 + 0.08 
 
 11.44 
 ii .69 
 12-47 
 12-35 
 
 O.O2 
 + O.O2 
 O.2O 
 + 0.07 
 
 ii .46 
 11.68 
 12.78 
 12.13 
 
 o.oo 
 
 + O.OI 
 -f O. II 
 
 -0.15 
 
 1 1 .46 
 ii .67 
 12.67 
 12.28 
 
 11.71 
 ii .92 
 12.92 
 12.53 
 
 0.01 
 0.02 
 0.13 
 o. 10 
 
 
 
 
 Mpan 
 
 12.02 
 
 12.27 
 
 0.06 
 
 
 
 
 
 
 
 40-INCH. 
 
 June 8. July 12. Aug. 
 
 30. Sept. 13. 
 
 Mean. 
 
 Mag. A Mag. Mag. 
 
 A Mag Mag. 
 
 A Mag. Mag. A Mag 
 
 Mag. H 
 
 . Mag.P 
 
 A Mag. 
 
 f 10 
 
 59 
 74 
 81 
 52 
 
 O. 1 
 
 + 0.1 
 + O.C 
 
 o.c 
 
 5 10.64 
 
 7 
 
 0. 1C 
 
 ) ii. oo +0.25 
 11.40 0.17 
 
 ) 1 1 . 8O O . OO 
 
 12. 61 0.09 
 
 10-74 
 it-57 
 11.80 
 12.62 
 
 10.99 
 11.82 
 12.05 
 12.87 
 
 o. 17 
 0.17 
 0.05 
 0.05 
 
 / 
 
 n II 
 
 r . . . i i . 68 o . i 2 ii 
 s . . . 12.67 -0.15 12 
 
 Mean 
 
 >i 11.89 
 K) 1 2 . 66 
 
 + O.OC 
 + O.Oi 
 
 11.66 
 
 ii .91 
 
 O. II 
 
 k 
 
 IS.< 
 
 >4 
 
 21 
 
 + O. It 
 + 0.2( 
 
 1^ 15-37 -0.13 
 ) 14.77 0.18 
 13.07 -0.07 
 r 14.72 0.03 
 ) 15.01 0.21 
 14.8 
 i 13.97 -0.29 
 i4-9 
 
 5-5o 
 14-95 
 13-14 
 14-75 
 15-22 
 i4-8 
 14.26 
 
 15 21 
 
 15-75 
 15.20 
 
 13 39 
 15.00 
 
 '5-47 
 i5-i 
 14-51 
 15-46 
 
 0.14 
 0.17 
 0.08 
 
 O. II 
 
 0.20 
 0.21 
 
 P . . 14.87 -0.08 . . 
 
 22 
 
 + O.C 
 
 - 15- 
 
 >8 
 
 ft. . 14.62 0.13 
 
 * 
 
 '4- 
 I.S- 
 
 )2 
 2 
 
 -fo.i- 
 
 + O.2< 
 
 
 
 TI... 14.12 -0.14 1439 
 
 e 
 
 + 0.13 14-54 
 15-36 
 
 + 0.2i 
 
 
 
 
 
 o. 15 
 
 
 
 
 
 
94 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 MAGNITUDE 
 IS. IS 14- 13 . /Z II 10 
 
 6IQO RV HCRCULIS 
 
 30 
 
 10 
 
 i 
 
 FIG. 19. MAGNITUDE-CURVE FOR RV HERCULIS. 
 
CHAPTER VII. RV HERCULIS. 
 
 95 
 
 TABLE 58. 6100 RV HERCUUS. VISUAL OBSERVATIONS OF THE VARIABLE. 
 
 No. 
 
 i 
 
 2 
 
 3 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 10 
 ii 
 
 12 
 '3 
 14 
 15 
 
 16 
 
 17 
 18 
 
 19 
 20 
 
 21 
 22 
 
 23 
 24 
 25 
 26 
 
 27 
 28 
 
 29 
 30 
 
 3' 
 32 
 33 
 34 
 35 
 36 
 37 
 38 
 39 
 40 
 
 4' 
 42 
 43 
 44 
 45 
 46 
 47 
 48 
 
 49 
 5 
 51 
 52 
 
 Date. 
 
 Ocular. 
 
 
 
 3 
 
 i 
 I 
 
 <! 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing 
 
 t. 
 
 A Mag. 
 
 Month 
 and Day. 
 
 Hour 
 
 :.S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 1897 
 Aug. 23 
 
 24 
 
 27 
 29 
 3 
 Sept. 3 
 
 7 
 
 12 
 17 
 21 
 
 22 
 
 25 
 28 
 
 Oct. i 
 13 
 M 
 
 25 
 29 
 Nov. ii 
 16 
 Dec. 29 
 3' 
 
 1898 
 Jan. 18 
 28 
 Feb. 1 2 
 '5 
 24 
 Mar. 2 
 
 23 
 Apr. i 
 ii 
 
 15 
 26 
 May 7 
 June 13 
 '3 
 
 21 
 25 
 
 July 6 
 
 7 
 July 21 
 
 23 
 Aug. 8 
 18 
 
 22 
 24 
 27 
 
 Sept. 2 
 
 7 
 20 
 Oct. 5 
 ii 
 
 9 
 9 
 
 9 
 
 8 
 
 9 
 
 8 
 8 
 8 
 7 
 
 7 
 
 7 
 8 
 8 
 8 
 7 
 7 
 6 
 6 
 6 
 6 
 6 
 it 
 
 18 
 18 
 18 
 
 i? 
 18 
 
 17 
 17 
 16 
 
 9 
 16 
 
 9 
 9 
 
 12 
 12 
 10 
 
 13 
 IO 
 10 
 IO 
 IO 
 
 9 
 
 IO 
 
 9 
 9 
 
 8 
 
 7 
 6 
 
 2410000+ 
 4160.63 
 
 4161.63 
 
 4164.63 
 4166.58 
 4167.63 
 4171-58 
 4I75-58 
 4180.58 
 4185.54 
 
 4189.54 
 
 4190.54 
 
 4193-56 
 4196.58 
 4199.58 
 4211.54 
 4212.54 
 4223 50 
 4227.50 
 4240.50 
 
 4245 50 
 4288.50 
 4291.00 
 
 4309.00 
 4319.00 
 4334-0 
 4336 96 
 4345 98 
 435I-96 
 4372.96 
 4381.92 
 4391.63 
 4395-92 
 4406 63 
 44I7-63 
 4454 
 4454 
 4462.75 
 
 4466.75 
 4477-67 
 4478.79 
 4492.67 
 4494-65 
 4510.67 
 4520.67 
 
 4524-63 
 4526.65 
 
 4529-65 
 4535-61 
 4540 
 4553 56 
 4568.54 
 4574-52 
 
 80 
 
 [150 
 80 
 
 ! so 
 i 80 
 I so 
 1 so 
 150 
 150 
 so 
 150 
 150 
 150 
 150 
 
 150 
 
 150 
 150 
 150 
 150 
 15 
 150 
 15 
 150 
 150 
 150 
 15 
 150 
 
 150 
 150 
 150 
 150 
 150 
 150 
 40 
 4 o 
 150 
 150 
 15 
 150 
 
 275 
 so 
 
 so 
 so 
 175 
 15 
 150 
 150 
 150 
 150 
 
 So 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 12 
 
 24 
 12 
 12 
 12 
 40 
 8 
 12 
 12 
 12 
 12 
 12 
 6 
 6 
 
 6 
 6 
 6 
 6 
 
 uid 62 31; 
 
 40.8, 42. i 
 
 41.4 
 40.4 
 
 39-5 
 38-5 
 37-6 
 37-3 
 36-4 
 33-8 
 31.0 
 
 28.7 
 
 28.8 
 27.0 
 25.8 
 25.6 
 <36 
 
 <24 
 <26 
 
 <25 
 <27 
 <26 
 
 <44 
 
 10.40 
 10.57 
 
 10-75 
 10.90 
 ii. 06 
 
 II. 10 
 
 11.25 
 ii .69 
 
 12. IO 
 12.50 
 
 12.49 
 12.77 
 12.96 
 12.98 
 <I2. 3 
 <I3-2 
 <I2.9 
 
 <i3-i 
 
 <I2.8 
 <I2.9 
 <IO 
 
 <I2. 3 
 
 13.01 
 11.79 
 10.97 
 11.17 
 
 II .00 
 10.73 
 10.53 
 
 II .00 
 11.70 
 11.80 
 
 12. IO 
 
 13.13 
 
 <i4-i 
 
 <i4-7 
 i5 
 H-7 
 13-27 
 14-97 
 <i3-7 
 
 I4-2 
 
 13.28 
 11.82 
 11.67 
 
 poor 
 good 
 
 good 
 good 
 good 
 moon 
 moon 
 fair 
 fine 
 
 good 
 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 fine 
 low 
 good 
 
 fair 
 good 
 fair 
 good 
 good 
 good 
 good 
 good 
 fair 
 good 
 good 
 fine 
 good 
 good 
 
 fair 
 moon 
 
 good 
 good 
 good 
 good 
 
 fair 
 good 
 good 
 good 
 fair 
 good 
 good 
 
 o 
 
 i 
 
 4 
 6 
 
 7 
 ii 
 
 15 
 
 20 
 25 
 29 
 30 
 
 33 
 36 
 39 
 
 149 
 159 
 '74 
 176 
 185 
 191 
 
 12 
 21 
 31 
 
 35 
 
 46 
 
 57 
 94 
 94 
 1 02 
 106 
 
 "7 
 118 
 132 
 134 
 150 
 1 60 
 164 
 
 169 
 
 '75 
 1 80 
 
 193 
 8 
 
 '4 
 
 -0.13 
 
 + O.OI 
 
 + 0.18 
 +0.30 
 + 0.46 
 
 +0-43 
 + 0.43 
 + 0.88 
 + i. 19 
 
 + 1-50 
 
 + 1-47 
 + 1.67 
 + 1.78 
 
 + 1.71 
 
 0.28 
 0.89 
 0.40 
 
 O.O2 
 + O.24 
 + O. 12 
 
 o. 16 
 + 0.18 
 +0.66 
 + 0.65 
 + 0.65 
 + I-33 
 
 + o.8 
 
 + o.3 
 
 + 0.50 
 
 + O.I 
 
 + 0.03 
 -0.68 
 -0.38 
 
 -0.15 
 
 + 0.06 
 + O.22 
 
 + o. 14 
 
 0.06 
 -0.03 
 
 6311, vi 2d 
 
 4'-6, 4' -3 } 
 40.6, 40.3, 38.2. 
 38.7,41-6 I 
 
 Vld, 1>2/, /4O, 02^ 
 
 trw bx QIU . 
 
 U2S st, or, r2m 
 
 ::::::::::::::::: 
 
 
 j 
 
 641), dm, V2f 
 
 651) d2TJ 1140 "V2J 
 
 40.6, 38.8, 39.2.. . 
 39-6,37-8,37.4-39-2 
 
 37-8, 39.2, 35.9.. . . 
 37-8, 37.7, 36.4.. . . 
 35-8, 35.2, 36.4.. . . 
 33-2, 33.9, 34.3.. . . 
 3'-3, 30-4, 3I-3-- 
 27-3, 29.4, 29.3..) 
 28.8 ) 
 
 d2V, T)2f, 772-30 
 
 dxv, vo-ij, zrjo 
 
 d$V, \2T), 1130 
 
 /4D, ro-io, T>4f> 
 
 T2TJ, 033, Tllp 
 
 fr6i, 041;, PITJ 
 {ill 2s, o2t, limit 2 <^t 
 
 p2v, V2s, limit 34 < s. . . 
 
 o6v, p4V, VS, TJ2t 
 
 si 2v, limit v 
 
 28.3, 29.3 
 27.4, 26.3 27.3.. . . 
 
 S2V, Vt 
 
 25. 3, 26.0 
 
 v not seen, limit u 
 
 
 v not seen, limit 3 < s . 
 v not seen, limit i <C s 
 
 
 
 
 
 v not seen limit s 
 
 
 i> not seen limit i <i s 
 
 
 11 not seen, limit b 
 
 
 
 
 s2v ? limit v ? . . . . 
 
 
 25-3 
 33-' 
 38.2 
 
 37-o 
 38.0 
 
 39-7 
 40.8 
 38.0 
 33-6 
 33- 
 
 3'-' 
 24.6 
 
 <i8 
 
 fl211 VO, Tl^S 
 
 35-7, 33-4, 30-3- - 
 
 vij 
 
 vo-if, ds-qv 
 vj, b6v, di-2v 
 i>2/, 661;, vi-2d 
 
 37-7, 36.3 
 37.2,38.6,38.3.-- . 
 39.2, 38.6, 41.3.. . . 
 
 40.6, 40.8, 41 . 2. . . . 
 38.8,37.2,36.4,39.6 
 
 32-4, 34-2, 34-3- - - 
 3 2 -4,30.3, 34-2, 35-3 
 29.3, 29.3, 34,8. . . 
 24.3, 25.0 
 
 
 OITJ, fsv, vir 
 
 OIV, Tip, /3V, T12Y 
 r^T), T12S, U\TJ 
 
 syv, tiv, limit v 
 v not seen, limit 8 10 < s 
 v not seen, limit 2" < s .. 
 vk 
 
 
 
 9-5 
 
 v seen limit 2 M < s . . . . 
 
 
 
 
 23.8 
 
 12.2 
 <2I 
 
 P2V, f 3-4*! 
 
 v not seen limit 6 < s . . 
 
 12.5, 12.0 
 
 "v is ii M < s 
 
 
 
 
 23-8 
 32-9 
 
 34-o 
 
 1120, ryu, J4V 
 vSs D2y ov /5~ 6v 
 
 35-4, 30-3, 33-2- . . 
 35-3,35-8,33.4,3i.7 
 
 
 
 35-3,34.2,34-4,35.8 
 35-2,36.3,35-8,36.4 
 
 37-3,36.9,35.7,37.3 
 38.1, 39.7, 41.3. . 
 
 39-i, 41-2, 41-8. . 
 39 6, 39-3, 4'.2. . . 
 
 34-4 
 35-9 
 36.8 
 
 39-7 
 40.7 
 40.0 
 
 11.58 
 11.32 
 1 1. 20 
 10.71 
 
 10.55 
 10.66 
 
 
 di-2v, 1/3-40, /o-iv, TI^T . . 
 66-71;, V2-3J, vi-2d 
 65-6-11, i>4/, V2d 
 651), rfo-ir, i>4/ 
 
9 6 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABUJ 58. 6100 RV HBRCUUS. VKUAI, OBSBRVATIONS OP THB VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing 
 
 t. 
 
 JMag. 
 
 Month 
 and Day. 
 
 Hour 
 C.S.T 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 53 
 54 
 55 
 56 
 57 
 58 
 
 59 
 60 
 61 
 62 
 
 63 
 
 64 
 
 65 
 66 
 
 67 
 68 
 
 69 
 70 
 
 7i 
 72 
 73 
 74 
 75 
 76 
 77 
 78 
 79 
 80 
 81 
 82 
 
 83 
 84 
 
 85 
 86 
 
 87 
 88 
 89 
 90 
 
 9' 
 92 
 
 93 
 94 
 95 
 96 
 
 97 
 98 
 
 99 
 
 1898 
 Oct. 15 
 
 3i 
 Nov. 5 
 ii 
 
 12 
 19 
 
 1899 
 
 Jan. 8 
 10 
 Feb. 15 
 Mar. 4 
 
 19 
 Apr. 4 
 16 
 
 21 
 
 28 
 
 May i 
 4 
 9 
 
 18 
 
 29 
 June 3 
 13 
 24 
 July 8 
 Oct. 7 
 17 
 24 
 30 
 Nov. 4 
 IS 
 20 
 
 Nov. 26 
 
 Dec. 5 
 26 
 
 1900 
 Jan. 7 
 
 20 
 26 
 
 Feb. 5 
 18 
 
 22 
 25 
 
 Mar. 7 
 15 
 
 22 
 
 Apr. 4 
 
 17 
 18 
 
 6 
 
 7 
 6 
 8 
 
 7 
 6 
 
 18 
 18 
 
 17 
 17 
 17 
 16 
 
 15 
 15 
 9 
 
 9 
 9 
 9 
 
 9 
 
 9 
 9 
 9 
 9 
 9 
 7 
 7 
 6 
 6 
 6 
 6 
 
 6 
 6 
 
 6 
 18 
 
 15 
 15 
 16 
 
 15 
 15 
 18 
 
 12 
 
 15 
 9 
 9 
 
 2410000+ 
 4578.52 
 4594-54 
 4599-50 
 4605 . 58 
 4606.52 
 4613-50 
 
 4664.00 
 4666.00 
 4701 . 96 
 4718.96 
 4733-96 
 4749.92 
 4761.88 
 4766.88 
 4773-63 
 
 4776.63 { 
 4779-63 { 
 4784-63 1 
 
 4793-63 { 
 
 4804.63 
 4809 . 63 
 
 4819-63 
 4830.63 
 4844.63 
 4935-54 
 4945 54 
 4952.50 
 4958.50 
 4963 50 
 4974-50 
 
 4979- 50 { 
 4985-50\ 
 
 4994- 50 { 
 5016.00 
 
 5027 
 5040.88 
 5046.88 
 5056.92 
 5069 . 88 
 5073-88 
 5076.98 
 5086 
 
 5094 
 5101.75 
 
 5114-88 | 
 5125.63 
 5I26.63J 
 
 80 
 150 
 150 
 150 
 150 
 150 
 
 150 
 200 
 150 
 150 
 
 40 
 40 
 40 
 40 
 40 
 150 
 40 
 150 
 40 
 150 
 40 
 150 
 150 
 150 
 150 
 150 
 200 
 150 
 80 
 150 
 150 
 150 
 150 
 40 
 150 
 40 
 150 
 40 
 150 
 200 
 
 200 
 
 350 
 35o 
 350 
 350 
 350 
 350 
 275 
 350 
 350 
 275 
 275 
 15 
 134 
 275 
 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 40 
 
 4 
 40 
 40 
 40 
 40 
 
 12 
 40 
 40 
 12 
 12 
 6 
 
 12 
 12 
 
 d2v, )2T>, i>4r 
 di2Ti, 1130, J2v, iiqr 
 
 37-8, 35-2, 37-3--- 
 38.3,36.4,35.2,37.3 
 32.2,32.3, 32.4,33.3 
 30.9, 29.8 
 29-9. 29-3 
 
 36.7 
 36.8 
 
 32-5 
 30-3 
 29.6 
 26.3 
 
 <25 
 <24 
 
 29.6 
 37-6 
 
 44-5 
 46.6 
 
 45-9 
 44-9 
 44-0 
 
 43-3 
 42.6 
 42.0 
 
 37-4 
 
 32-7 
 30-6 
 
 24-3 
 
 <26 
 <24 
 
 36.3 
 
 41 .0 
 
 41.3 
 41-7 
 
 42.0 
 
 40.9 
 41-3 
 
 40.1 
 
 36.1 
 25 
 
 <23 
 
 II .20 
 ii . 19 
 
 11.88 
 
 12.22 
 12.35 
 12.87 
 
 <i3-o 
 
 <I3 2 
 
 12.35 
 
 1 1. 06 
 9.88 
 9.66 
 9-77 
 9-84 
 9-99 
 
 IO. IO 
 
 10.23 
 
 10.31 
 
 11.05 
 11.85 
 
 12. 19 
 
 I3-I6 
 <I2.g 
 
 <I3 * 
 
 11.26 
 10.48 
 10.43 
 
 10.37 
 10.31 
 10.50 
 
 10-43 
 10.62 
 
 ii .29 
 13.0 
 
 <J3-4 
 I5 
 14.96 
 15 09 
 
 <I4-2 
 
 15-45 
 <5 5 
 <i3-5 
 <i3-7 
 14.41 
 
 13-42 
 12.49 
 12.29 
 
 good 
 fair 
 good 
 fair 
 fair 
 moon 
 
 poor 
 
 18 
 34 
 39 
 45 
 46 
 53 
 
 4-0-42 
 4-0-07 
 4-0-62 
 4-0.80 
 + 0.90 
 + 1.24 
 
 /5ii, nil, 0111, v6s .... 
 
 02-37;, TJ2-y 
 03-471, vis 
 
 "v glimpsed limit 2 < j 
 
 
 v not seen, limit 3-4 < s.. 
 r\Tj, vois 
 /2i, 7147-, 7/40, vo id 
 
 
 29.3. 27-8 
 35-2, 37-3, 37-4. 40-3 
 45.1, 45.2, 43.3... 
 45-6, 47-7 
 45-2, 45-6, 47.3. . 
 44-7- 44-6, 45.8. . 
 44.2, 43.6, 44.8.. . 
 42-6, 43-8 ) 
 42-', 44-8 j 
 42.6, 41 .8 ... . ) 
 
 good 
 fair 
 good 
 good 
 good 
 good 
 good 
 
 good 
 fair 
 fair 
 
 fair 
 
 good 
 good 
 good 
 fair 
 good 
 fair 
 fair 
 fair 
 fair 
 good 
 fair 
 
 fair 
 good 
 
 fair 
 fair 
 
 good 
 fair 
 good 
 good 
 poor 
 fair 
 poor 
 good 
 moon 
 good 
 
 good 
 poor 
 good 
 
 141 
 
 158 
 173 
 189 
 i 
 6 
 13 
 16 
 
 19 
 24 
 
 33 
 
 44 
 49 
 59 
 70 
 
 '75 
 185 
 192 
 198 
 3 
 14 
 
 19 
 25 
 
 34 
 56 
 
 80 
 86 
 96 
 
 "3 
 
 141 
 
 '54 
 165 
 1 66 
 
 -1-37 
 -i.59 
 -i-54 
 -0.99 
 -0.78 
 
 -0.75 
 -0.71 
 
 0.64 
 o. 56 
 -0.58 
 
 0.06 
 
 4-0.46 
 -fo.66 
 + 1.63 
 
 + O.O2 
 -0.30 
 
 o. 16 
 -0.15 
 0.26 
 
 O.2I 
 
 -0-37 
 O.29 
 
 + 0.71 
 + 1.23 
 
 + i'?3 
 + i .20 
 
 + 0.99 
 
 + 0.68 
 + 0.44 
 + 0.40 
 + 0.30 
 
 7116, e6v, 713 4<i 
 7116, 63-411 
 e6v, vib, vj-8d 
 e6-7T>, -vb, v6d 
 ed-8v, biv, v$d 
 
 6211, T>4d 
 
 62-311, Ti$d 
 
 0211 V2d 
 
 0211, 113-4^ 
 byv, 7>2 3rf 
 
 42-6, 43-3 ) 
 41-6, 42-3 ) 
 42.1, 4.2.1 j 
 37-6, 37-8 > 
 37-3, 37-2, 37-3--) 
 33-7,33-3,32-4, 31-3 
 30.8, 30.3 
 
 62-311, 712-3<i 
 66-811, d2T> 
 
 6(2-311, 7i/, H4r. 
 /3~ 411, w, 0111, 114 s ... . 
 
 f2-31l, 113* 
 
 J-3H . 
 
 11 not seen, limit 12 <C j 
 
 
 11 not seen, limit 3-4 < s... 
 Tj2r, /2n, 1/230, din 
 
 
 35-3. 35-2, 35-9, 38-8 
 41 .8, 40.7, 40.6.. . . 
 41.2, 38.6, 42.8. .. 
 41 .1, 41.2, 42.8. .. 
 4'-6, 43-3, 4'-2. .. 
 
 4O.6, 41 .2 
 4O.6, 41.8 1 
 40.6, 42.3 { 
 39.6, 40.8, 39.2..) 
 38.6, 41.8, 40.7..) 
 
 35-8, 34-9 ) 
 38-3, 35-4 i 
 
 7i2d, U3-4/, 6411 
 H4/, 66i>, v$d 
 63-411, T/4/, irjd 
 biv, -V3-4d, n 4 / 
 6411, D4/ 
 6411, V2d. 
 
 6411, H2-3< 
 6511, Tlld, 1>2/ 
 
 6611, T/2d, 113 4/ 
 ^471, ni 20 
 
 dl-27i, K20 
 J27J ? 
 
 11 not seen limit 4 < j 
 
 
 11 glimpsed not < I5 M 
 
 
 P211 711* 713& 1*20 
 
 12.5, 12-4, II-5, 12-0 
 
 10. i, n-4, n-5, ii'O 
 
 12. I 
 II . I 
 
 411 11* "v^k T) i ft 
 
 v not seen, limit ii M < s.. 
 P6v, tya, vo-ik 
 11 not held,& and* glimpsed 
 11 not seen limit 4 5 < 
 
 8.5, 8.4, 9.0 
 
 8.6 
 
 < 8.5 
 
 <22. 4 
 
 
 
 
 H4/" 1 17211 8 1011 ii5/> .... 
 
 18.5, 13-7, (i7-9), 19-5 
 26.9, 23.8, 17.4.. I 
 
 '5-9 
 22.7 
 28.8 
 30.0 
 
 7!, .3-411, V21 
 
 
 
 V2S, H4, ri 211 
 in j^- 
 
 29 3, 30-9, 3i -8- \ 
 28.3 / 
 
 
 
CHAPTER VII. RV HERCUUS. 
 
 97 
 
 TABLE 58. 6100 RV HERCULIS. VISUAL OBSERVATIONS OP THE VARIABLE. Continued 
 
 No. 
 
 Date. 
 
 ti 
 
 1 
 
 1 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 ' 
 
 A Mag. 
 
 Month 
 and Day 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day 
 G. M. T 
 
 Steps. 
 
 Mag. 
 
 IOO 
 101 
 
 1 02 
 
 103 
 
 104 
 
 105 
 
 106 
 107 
 
 108 
 
 109 
 no 
 in 
 
 112 
 
 "3 
 114 
 
 "5 
 116 
 
 ii? 
 118 
 
 119 
 1 2O 
 121 
 122 
 123 
 
 124 
 
 125 
 126 
 127 
 128 
 
 129 
 130 
 131 
 132 
 133 
 134 
 
 135 
 136 
 '37 
 138 
 
 139 
 140 
 141 
 142 
 
 143 
 144 
 
 '45 
 146 
 
 1900 
 Apr. 30 
 May 19 
 
 June 17 
 July 12 
 
 21 
 
 Aug. 30 
 Sept. 12 
 
 13 
 
 Oct. 4 
 16 
 26 
 
 1901 
 May 1 8 
 June 3 
 
 July 20 
 Oct. 1 8 
 
 31 
 Nov. 7 
 
 12 
 
 1902 
 Feb. 3 
 Mar. 5 
 28 
 July 27 
 Oct. i 
 
 1903 
 Mar. 20 
 Apr. 4 
 May 17 
 July 24 
 Sept. 20 
 
 1904 
 May 14 
 June 19 
 July i 
 
 3' 
 Aug. 4 
 u 
 Sept. 2 
 
 '4 
 Oct. 8 
 Nov. 30 
 
 1905 
 Jan. 12 
 Feb. 14 
 Mar. 5 
 
 12 
 26 
 
 Apr. 4 
 u 
 Apr. 22 
 
 IO 
 
 9 
 
 '3 
 9 
 
 IO 
 
 9 
 9 
 9 
 
 8 
 
 8 
 9 
 
 7 
 
 9 
 
 10 
 
 8 
 
 7 
 8 
 
 7 
 
 u 
 16 
 
 8 
 
 17 
 15 
 
 IO 
 
 IO 
 IO 
 
 9 
 6 
 
 18 
 16 
 16 
 '3 
 13 
 15 
 16 
 
 IO 
 
 2410000 + 
 5140.67 
 5159-63 
 5I7I-79 
 5188-63 
 
 5213-69 
 
 5222.63 
 5262.63 
 5275-63 
 
 5276.58 
 
 5309-63 
 53I9-54 
 
 5523-63 
 5539 67 
 
 5586 
 
 5676.58 
 5689.54 
 5696-58 
 
 5701-54 
 
 5784.96 
 5814-71 
 
 5858' 
 6024.58 
 
 6194.96 
 6209 . 88 
 6252 
 6320 
 6378 
 
 6615 
 6651 
 6662.67 
 
 6693- 
 6697.67 
 6704.67 
 6726 
 6738 
 6762.61 
 6815.50 
 
 6859.00 
 6891.92 
 6910.88 
 6917.77 
 6931 79 
 6940 . 88 
 6947.92 
 6958.67 
 
 150 
 'SO 
 237 
 150 
 
 237 
 
 150 
 350 
 
 75 
 
 237 
 
 237 
 450 
 ISO 
 
 80 
 237 
 
 80 
 
 6 
 6 
 40 
 6 
 
 40 
 
 6 
 
 40 
 
 12 
 40 
 
 40 
 40 
 
 6 
 
 12 
 4 
 
 24 
 
 12 
 
 /it 1 , TIO, i>4r, v6s 
 
 JO-ITI, T120 
 flV, T12T, T>6s, VO 
 
 /4^, 112 3r TJ20 . . 
 
 36.2,33.4,37.3,33.3 
 
 36.7, 35-3 
 36.2, 35.3,33.3, 33-4 
 
 33-2, 35-8, 35- 4- 
 i 
 
 35-o 
 36.0 
 
 34-5 
 34-8 
 
 24-3 
 '3-4 
 
 11.49 
 u .30 
 11.38 
 11.51 
 
 12.26 
 
 I3-I7 
 14-77 
 
 good 
 fair 
 good 
 
 fair 
 
 fair 
 good 
 
 i So 
 199 
 1 1 
 
 28 
 
 53 
 62 
 1 02 
 
 +0.50 
 +0.77 
 + 0.71 
 + 0-53 
 + 0.63 
 
 + 1.19 
 + 0.57 
 
 +0.48 
 
 
 
 
 
 
 i?3*p, up, viP 7746 
 
 12.7, 10.0, 15.5, 15.4 
 
 v not seen, limit I <.... 
 
 u .0. . . . ) 
 
 II .2 
 
 14.96 
 
 good 
 
 116 
 
 
 
 (P 2 yil, Tli, V2~3k, 151), Tllf. 
 
 12.0,11.4, 11.0, 10.7) 
 
 s6v t ^5-61, 03-41; 
 
 21.3, 21.2, 23.4.. . . 
 26.3, 28.4 
 
 21.9 
 27-3 
 
 22.3 
 31-8 
 
 <26.9 
 
 < 2 4-4 
 10.8 
 
 41.4 
 
 35 
 33-3 
 
 13-53 
 12.71 
 
 '3-47 
 
 12.00 
 <I2.8 
 
 15.13 
 
 10.40 
 11.48 
 11.77 
 
 ii. 9 
 10.51 
 
 10.22 
 10.96 
 <n.8 
 13 98 
 10.71 
 
 10.69 
 12.31 
 12-55 
 <t3-7 
 <i3.oo 
 
 <i3-4 
 13-2 
 
 fair 
 fair 
 
 good 
 fair 
 
 fair 
 
 137 
 149 
 
 163 
 '79 
 
 -0.38 
 -0-57 
 
 + 1.23 
 + 0-57 
 
 s^v v near limit 
 
 
 (*, , y, and ft near limit . \ 
 i P and * seen, but not k , \ 
 u not seen limit * 
 
 3'-3, 32.3 
 
 limit of 24-inch i5 M .2 
 
 
 
 60 
 
 350 
 
 80 
 237 
 237 
 
 237 
 
 237 
 40 
 
 67 
 350 
 40 
 
 40 
 
 60 
 40 
 67 
 67 
 67 
 
 237 
 
 40 
 
 40 
 250 
 237 
 237 
 237 
 237 
 237 
 237 
 
 24 
 40 
 
 12 
 40 
 40 
 24 
 40 
 
 40 
 
 6 
 
 12 
 
 40 
 
 6 
 
 6 
 24 
 24 
 6 
 
 12 
 12 
 12 
 24 
 40 
 
 6 
 
 6 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 
 v not seen, limit 2-3 < *. . 
 >5V, viP, Pyv, vik, div.. . -j 
 
 
 
 
 
 10.7,11.0,11.5,10.4} 
 
 10. 5 ) 
 
 fair 
 
 fair 
 good 
 poor 
 
 fair 
 good 
 poor 
 poor 
 good 
 
 good 
 good 
 good 
 fine 
 fair 
 good 
 good 
 
 141 
 
 24 
 54 
 
 77 
 
 64 
 
 34 
 49 
 
 160 
 18 
 
 55 
 1 02 
 
 '37 
 166 
 
 + 1.41 
 -0.49 
 
 0.20 
 -0-93 
 
 0.89 
 -0-57 
 
 + 1-49 
 0.07 
 
 1.02 
 I.OI 
 
 -1.6 5 
 
 O.9I 
 
 + I.2 
 
 40. i, 42 8 . . 
 
 v is between / and r . . 
 
 
 
 
 photograph 
 
 
 
 
 
 
 
 42.7 
 
 
 
 V not seen, limit o 
 
 
 <33 
 19.0 
 
 j6 8v, vzn 
 photometer . . 
 
 20.3, 17.7 
 
 b6v, vd, v$f 
 
 38.6, 39.8, 42.2.. .. 
 30.4, 30.3, 28.8.. . . 
 24-8, 31 9 
 
 39 9 
 29.8 
 28.4 
 
 S2-3V, t>5 
 T> not seen limit i** < s .. 
 
 v not held, perhaps a i 2V. 
 v not seen limit 4 <C a 
 
 
 <25-4 
 
 <2 3 
 
 23 9 
 
 
 v perhaps glimpsed, 3f ? . 
 
 
 
 
 18.3 
 
 
 
 
 
 
 r2f, vjs 
 
 06-8V, V20. 
 >>4-5T, T>P, LOD 
 
 sio-12-v, Tin, v6l 
 
 S^T), v6 
 
 40.6, 41 .8 
 
 3'-3. 34-3 
 19.9, 20.7 
 26.4, 28.9 
 24-3. 32-9 
 
 II. 2, 14.5, (16.9).. 
 
 13-7, '9-5 
 16-3, 23.3, 21.7.... 
 23-3, 29.3 
 
 41.2 
 
 32.0 
 20.3 
 28.1 
 26.5 
 13-4 
 
 22.9 
 26.3 
 
 10.47 
 
 u -95 
 13-77 
 12.58 
 12.82 
 14.76 
 
 13-40 
 
 12.88 
 
 fair 
 
 fair 
 good 
 fair 
 good 
 fair 
 
 good 
 fair 
 
 55 
 
 99 
 
 5i 
 157 
 171 
 1 80 
 187 
 198 
 
 -1.24 
 
 -2.08 
 -0.30 
 
 0.61 
 
 + O. IO 
 
 + 2.36 
 
 + 3-45 
 + 2.65 
 
 + 2.33 
 
9 8 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 58. 6100 RV HERCULIS. VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No. 
 
 '47 
 148 
 149 
 150 
 151 
 152 
 153 
 154 
 155 
 156 
 '57 
 158 
 159 
 
 Date. 
 
 1 
 u 
 
 O 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 /. 
 
 4 Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C.S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 1905 
 Apr. 30 
 May 31 
 June 13 
 
 22 
 
 July 24 
 Aug. 9 
 20 
 
 ->*> 
 
 Sept. 2 
 19 
 Oct. 21 
 
 3 
 Nov. 1 8 
 
 13 
 9 
 14 
 9 
 9 
 8 
 
 9 
 9 
 
 12 
 II 
 
 8 
 
 7 
 6 
 
 24100004- 
 6966 . 79 
 6997.63 
 7010 83 
 7019 .63 
 7051-63 
 7067.60 
 7068.62 
 7080.63 
 
 7091.75 
 7 108 . 7 i 
 7140.58 
 
 7150.54 
 7168.48 
 
 237 
 40 
 
 237 
 150 
 150 
 150 
 237 
 237 
 237 
 
 2J7 
 
 237 
 237 
 
 237 
 
 40 
 6 
 40 
 6 
 6 
 6 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 
 7)1 2 S 
 
 
 28.8 
 44.8 
 
 12.48 
 9-85 
 
 IO.OO 
 
 9.79 
 
 10.90 
 12.92 
 
 13.11 
 
 13- 19 
 
 13.96 
 
 14 95 
 J4-75 
 13.89 
 12.80 
 
 good 
 good 
 good 
 fair 
 fair 
 moon 
 poor 
 good 
 fair 
 fair 
 good 
 good 
 good 
 
 6 
 37 
 50 
 59 
 9i 
 107 
 118 
 
 120 
 
 '3> 
 148 
 1 80 
 190 
 
 8 
 
 4-1.98 
 
 -1.35 
 -i.6 
 
 2.12 
 -2.70 
 
 -i-39 
 
 -'31 
 -1.33 
 o. 14 
 
 4-2.15 
 + 3.76 
 4-3.21 
 
 4-2.20 
 
 eSv, Tib, vjd 
 photometer 
 
 43.2, 44.6, 46.8 
 
 v$b, v$d, e8v 
 
 d2TI, Tllf 
 SI 27>i 
 
 47.6, 43.8, 43.2.. . . 
 37-8. 39-2 
 
 45-2 
 38.5 
 25.8 
 24.6 
 24.1 
 19.0 
 
 12. I 
 
 13 6 
 19-5 
 26.8 
 
 J5"- "3-4" 
 .53-411, vi" 
 5*>, u4>> 
 
 22.3, 26.8 
 23-8, 24.3 
 18.3, '9-7 
 
 147), ill P 
 
 a 3 V, T}) VP 
 SIV, VJ a 
 
 11.7, 15.5 
 20.3, 18.7, (22.5;.. 
 26.3, 30.3 
 
 
CHAPTER VIZ. RV HERCUUS. 
 
 99 
 
 
 
 X 
 
 I 
 
 
 
 S? 5 59 53 5 
 
 FIG 20. LIGHT-CURVE OF RV HERCUUS. 
 
IOO 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABI.E 59. 6100 RV HERCULIS. MEAN MAGNITUDES FROM i6J DAY GROUPS. 
 
 Group 
 T. D.. 
 
 No. ... 
 
 i 
 
 16 
 
 2 
 j-l 
 
 3 
 5 
 
 4 
 66 
 
 5 
 
 8-1 
 
 6 
 
 IOO 
 
 7 
 116 
 
 8 
 133 
 
 9 
 
 I SO 
 
 IO 
 
 1 66 
 
 it 
 
 181 
 
 12 
 2OO 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 (t 
 
 6 
 
 26 
 
 36 
 
 
 
 
 
 
 I4.O 
 
 I ^O 
 
 I 7S 
 
 188 
 
 
 M 
 
 10.86 
 
 12 . 2O 
 
 12.90 
 
 
 
 
 
 
 T l . OI 
 
 1 1 . 7O 
 
 1 1 . 07 
 
 10 86 
 
 4160 ' 
 
 JM 
 
 -4-O 37 
 
 + 1 26 
 
 4- I 72 
 
 
 
 
 
 
 o 28 
 
 o 89 
 
 
 + o 18 
 
 
 No 
 
 7 
 
 4. 
 
 i 
 
 
 
 
 
 
 
 
 2 
 
 2 
 
 4360 - 
 
 f 
 
 M 
 
 JM 
 No. 
 
 r / 
 
 12 
 
 10-53 
 
 o. 16 
 i 
 
 1 1 
 
 26 
 
 n-35 
 + 0.42 
 
 2 
 
 18 
 
 4 
 
 1 1. 95 
 -1-0.65 
 
 2 
 41 
 
 57 
 13-13 
 + I-33 
 
 i 
 
 c^ 
 
 
 
 104 
 
 14.85 
 + 0.55 
 
 2 
 
 118 
 14-97 
 +0-50 
 I 
 
 '34 
 
 I4-2 
 
 + 0.1 
 
 I 
 
 58 
 
 12. 26 
 
 -o-34 
 3 
 
 is8 
 
 175 
 
 11-37 
 + 0.04 
 3 
 
 17-3 
 
 '93 
 IO.7I 
 
 o. 14 
 
 I 
 
 1 80 
 
 
 M 
 
 10 60 
 
 1 1 20 
 
 II OI 
 
 12 87 
 
 
 
 
 
 12 ^S 
 
 1 1 06 
 
 9 88 
 
 9 66 
 
 4560 < 
 
 ATA 
 
 o 04 
 
 -f-o 42 
 
 -f-o 60 
 
 4- i , 24. 
 
 
 
 
 
 I ^7 
 
 I SQ 
 
 I S4. 
 
 O QO 
 
 
 No. 
 
 2 
 
 I 
 
 4 
 
 I 
 
 
 
 
 
 I 
 
 I 
 
 I 
 
 I 
 
 
 If 
 
 9 
 
 22 
 
 42 
 
 4O 
 
 
 
 
 
 
 
 175 
 
 192 
 
 
 M 
 
 9Q2 
 
 10 27 
 
 II 7O 
 
 
 
 
 
 
 
 
 II 26 
 
 IO 4."? 
 
 4760 < 
 
 JM 
 
 O 72 
 
 O S4. 
 
 4-O ^5 
 
 -\-i 6* 
 
 
 
 
 
 
 
 -f-O O2 
 
 O 2O 
 
 
 No. 
 
 4 
 
 2 
 
 2 
 
 I 
 
 
 
 
 
 
 
 I 
 
 z 
 
 4960 i 
 
 < 
 M 
 
 JM 
 
 No. 
 
 \ t 
 
 8 
 10.40 
 -0.24 
 
 2 
 
 II 
 11.38 
 
 22 
 10.52 
 
 -0-33 
 
 2 
 
 28 
 11.51 
 
 34 
 ii .29 
 +O.I7 
 i 
 
 58 
 
 12- 72 
 
 56 
 i3-0 
 
 + I-2 
 I 
 
 80 
 
 15. o 
 
 2.IO 
 t 
 
 9i 
 
 J5-4 
 + 1.46 
 
 2 
 
 "3 
 
 15-45 
 + 0.99 
 i 
 
 109 
 
 14.92 
 
 
 141 
 
 14.41 
 
 + 0.68 
 
 i 
 
 '37 
 13.53 
 
 162 
 
 12-73 
 + 0.38 
 
 3 
 
 149 
 12.71 
 
 180 
 11.49 
 + 0.50 
 i 
 
 199 
 
 11.30 
 +0.77 
 i 
 
 5160 < 
 
 JM 
 
 +o 71 
 
 + O SI 
 
 -f-o 91 
 
 
 
 
 O. SQ 
 
 
 o ^8 
 
 -0.57 
 
 
 
 
 No. 
 
 I 
 
 I 
 
 2 
 
 
 
 
 i 
 
 
 i 
 
 i 
 
 
 
 
 [t 
 
 
 
 
 
 
 
 
 
 
 161 
 
 170 
 
 
 
 M 
 
 
 
 
 
 
 
 
 
 
 1^-47 
 
 12. OO 
 
 
 536 < 
 
 JM 
 
 
 
 
 
 
 
 
 
 
 + 1-23 
 
 + O-97 
 
 
 
 No. 
 
 
 
 
 
 
 
 
 
 
 i 
 
 I 
 
 
 
 r t 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 M 
 
 
 
 
 
 
 
 
 
 T r 17 
 
 
 
 
 556o < 
 
 4M 
 
 
 
 
 
 
 
 
 
 4- 1 4.1 
 
 
 
 
 
 No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 / 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 M 
 
 
 
 
 1 1 48 
 
 
 
 
 
 
 
 
 
 576o < 
 
 JM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 L No. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 !t 
 
 
 
 
 64 
 
 
 
 
 
 
 
 
 
 
 M 
 
 
 
 
 
 
 
 
 
 
 
 
 
 596o < 
 
 JM 
 
 
 
 
 T CX 
 
 
 
 
 
 
 
 
 
 
 No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 < 
 
 
 
 4.2 
 
 
 
 
 
 
 
 160 
 
 
 
 
 M 
 
 
 
 
 
 
 
 
 
 
 i -5.98 
 
 
 
 6160 
 
 JM 
 
 
 
 O 77 
 
 
 
 
 
 
 
 + 1.49 
 
 
 
 
 No. 
 
 
 
 2 
 
 
 
 
 
 
 
 i 
 
 
 
 j 
 
 < 
 
 
 18 
 
 
 
 
 
 
 
 
 
 
 
 
 M 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6360^ 
 
 JM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1 
 
 No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER Vll. RV HERCUUS. 
 
 lot 
 
 TABLE 59. 6100 RV HERCUUS. MKAN MAGNITUDES FROM i6 DAY GROUPS. Continued. 
 
 Group No .... 
 J.D 
 
 i 
 16 
 
 2 
 
 33 
 
 3 
 5 
 
 4 
 66 
 
 5 
 83 
 
 6 
 IOO 
 
 7 
 116 
 
 8 
 133 
 
 9 
 150 
 
 10 
 
 166 
 
 ii 
 
 183 
 
 12 
 2OO 
 
 c t 
 
 
 
 
 55 
 
 
 91 
 
 102 
 
 
 137 
 
 166 
 
 
 
 M 
 
 
 
 
 10.69 
 
 
 12.31 
 
 12 55 
 
 
 13.00 
 
 I3-2 
 
 
 
 6 5 6 1 JM 
 
 
 
 
 i .02 
 
 
 1 .01 
 
 -1.65 
 
 
 0.91 
 
 + I.2 
 
 
 
 L No 
 
 
 
 
 i 
 
 
 I 
 
 i 
 
 
 i 
 
 I 
 
 
 
 r t 
 
 
 
 
 55 
 
 
 99 
 
 
 131 
 
 
 151 
 
 
 
 M 
 
 
 
 
 10.47 
 
 
 ii 95 
 
 
 13-77 
 
 
 12.58 
 
 
 
 6 ?6 i JM 
 (_ No 
 
 
 
 
 -1.24 
 i 
 
 
 -2.08 
 
 i 
 
 
 0.30 
 
 i 
 
 
 0.61 
 i 
 
 
 
 ( t 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6960 JM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 [^ No. 
 
 r M < 
 
 Means { m 
 I No. 
 
 9 
 10.62 
 0.03 
 
 i? 
 
 23 
 1 1. 02 
 
 + 0.15 
 14 
 
 4? 
 11.87 
 + 0.52 
 i? 
 
 55 
 ii .91 
 
 + 0.32 
 
 7 
 
 78 
 i3-5 
 -0.58 
 
 2 
 
 94 
 13. 10 
 
 O.2I 
 
 4 
 
 107 
 14.44 
 
 + 12 
 
 6 
 
 124 
 '4-37 
 + O. IO 
 
 2 
 
 140 
 
 13-77 
 -0.27 
 
 7 
 
 158 
 12.64 
 -0.08 
 14 
 
 176 
 ii. 18 
 0.04 
 9 
 
 192 
 
 10.59 
 
 O.02 
 
 8 
 
 10 
 
 DAYS 
 
 too 
 
 5 
 
 14- 
 
 15 
 
 6100 RV HERCVUS 
 
 Max.* 
 Min. '< 
 M-m- 
 
 Zoo 
 
 Fio. si. MEAN LIGHT-CURVE OF RV HERCUUS. 
 
102 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 60. -6100 RV HERCUUS. OBSERVED MAXIMA AND MINIMA. 
 
 Elements of maximum. 1898, March 12 (J- D. 2414361) + 200^ E. M m = 81<J. 
 
 MAXIMA. 
 
 MINIMA. 
 
 i 
 
 w 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 1 
 
 W 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 Calendar. 
 
 J. D 
 
 H. 
 
 P. 
 
 Calendar. 
 
 J- D- 
 
 H. 
 
 P. 
 
 I 
 o 
 
 i 
 
 2 
 
 3 
 4 
 5 
 6 
 
 7 
 9 
 10 
 ii 
 
 12 
 
 13 
 
 1897 Aug. 23 
 1898 Mar. 15 
 Sept. 28 
 1 899 Apr. 6 
 Nov. i 
 1 900 May 21 
 Dec. 6 
 1901 June 29 
 1902 Jan. 22 
 1903 Feb. 24 
 Sept. 22 
 1904 Apr. 2 
 Oct. 1 8 
 1 905 June 14 
 
 4160 
 
 4364 
 456i 
 475i 
 4960 
 5161 
 536 
 5565 
 5772 
 6170 
 6380 
 6572 
 6772 
 7011 
 
 
 me 
 
 to-75 
 10.8 
 
 9 93 
 10.50 
 
 11-55 
 me 
 me 
 me 
 me 
 me 
 me 
 me 
 9 95 
 
 i 
 
 + 3 
 
 
 
 10 
 i 
 
 
 
 + 4 
 + 11 
 
 + 9 
 + 19 
 
 + 11 
 + u 
 + 50 
 
 10 
 
 12 
 2O 
 
 17 
 12 
 12 
 I 
 
 I 
 2 
 2 
 
 I 
 I 
 
 3 
 15 
 
 
 
 i 
 
 2 
 
 3 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 10 
 
 12 
 13 
 14 
 
 1897 Dec. i 
 1 898 July 2 
 1 899 Jan. 15 
 Aug. ii 
 1900 Feb. 17 
 Sept. 1 1 
 1901 Mar. 26 
 Oct. 29 
 1902 May 20 
 Dec. 16 
 1 903 July 14 
 1 904 Aug. 3 
 1 905 Mar. 15 
 Oct. 4 
 
 4260 
 
 4473 
 4670 
 4878 
 5068 
 
 5274 
 5470 
 5687 
 5890 
 6100 
 6310 
 6696 
 6880 
 7"3 
 
 
 me 
 15-6 
 me 
 me 
 15.60 
 15.22 
 me 
 me 
 me 
 me 
 me 
 14.2 
 15-25 
 15-65 
 
 20 
 
 - 7 
 10 
 
 12 
 
 - 6 
 
 IO 
 
 + 7 
 
 + 10 
 
 + 20 
 
 +30 
 
 + 16 
 + 40 
 + 43 
 
 i 
 8 
 i 
 i 
 
 12 
 
 8 
 i 
 
 2 
 O 
 O 
 I 
 2 
 
 9 
 
 12 
 
 10.50 
 10.6 
 9.68 
 10.25 
 11.30 
 
 '5-3 
 
 
 15-35 
 14-97 
 
 
 
 
 
 
 
 
 
 14.0 
 15.00 
 15 40 
 
 9.70 
 
 The mean light-curve was derived from the observations up to 1905 March 
 :5 (J. D. 6911). So far the period 200 days satisfied the measures, but the suc- 
 ' ceeding observations, covering the maximum and minimum of epoch 12, indicate 
 '. a slightly longer period, perhaps 204 days. The light-curve has several notable 
 features. The range is more than five magnitudes, unusually large for the length 
 of period. The decline is as rapid as the rise, and the minimum is as sharply 
 defined as the maximum. There is a suspicion of a secondary maximum arising 
 from three anomalous observations near the minima of epochs ii and 12, 
 but the evidence is hardly sufficient to definitely settle the question. A consider- 
 able range will be noticed in the magnitude at the maxima, the star reaching 
 9.7 at epochs 2 and 12, but only reaching 11.3 at epoch 4. 
 
CHAPTER VIII. 
 
 6894 S 
 R. A. igh gm 6-3; Dec. + 25 50' 17" (1900). 
 
 This star was numbered 868 by Espin, who noted a decline from gth to i2th 
 magnitude in 1893. The variability was confirmed by H. M. Parkhurst, and 
 the notation was assigned by Chandler in Astronomical Journal 14, in. The 
 notation is confused in the Nachrichten, where this star is numbered 6895, while 
 the number 6894 is given to X Lyrae, about i north of S. 
 
 Observations began in October, 1896; the places of the variable and the 
 brighter comparison stars were measured with the 6-inch in that month, the 
 places of the faint stars s, x, and those with Greek letters, were measured with 
 the 4O-inch in June, 1900. The stars e, c, and E' are in the Cambridge (Eng.) 
 A. G. Catalogue. Using the coordinates in Table 63, the position of the variable 
 relative to these stars results as given at the head of the page, with a probable 
 error of o?.2 and o".5. 
 
 The photometric measures of the brighter comparison stars are a little above 
 the average in accordance, the fainter stars a trifle below the average. The faint 
 star j9 has a very discordant measure with the 4o-inch on 1904 May 20, in good 
 seeing. The suspicion of variability aroused seems to be confirmed by the photo- 
 graphs, but not by the other visual comparisons. It is therefore reserved for 
 further investigation. 
 
 The photographic chart is given on a larger scale than usual in order to show 
 clearly the close comparison stars a and /J. 
 
 TABLB 61. 6894 S 1/VR.s. STANDARD MAGNITUDE STARS. 
 
 Star. 
 
 B. D. No. 
 
 1900. 
 
 Color 
 P. DM. 
 
 Magnitude. 
 
 Residuals. 
 
 R. A. 
 
 Dec. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nights 
 inter 
 se. 
 
 H. C. 0. 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 " 
 G' 
 H' 
 
 
 
 + 25 3757 
 + 26 3477 
 + 24 3687 
 
 Mean . 
 
 h m s 
 19 09 47 
 19 07 40 
 19 10 ii 
 
 Q I 
 
 + 25 35-1 
 + 26 04.9 
 + 24 50.6 
 
 GW 
 GW 
 W 
 
 6.88 
 7.40 
 7.16 
 
 7-24 
 
 7-97 
 7-50 
 
 6.91 
 
 7-45 
 7.10 
 
 7-33 
 7.87 
 
 7.52 
 
 + 3 
 + 5 
 -6 
 
 + 9 
 10 
 
 + 2 
 
 3 
 
 2 
 
 3 
 
 7-15 
 
 7-57 
 
 7-15 
 
 7-57 
 
 5 
 
 7 
 
 3 
 
 
 
 
 
 103 
 
IO4 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 TABLE 62. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 i855. 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 O 
 
 
 km s 
 
 / 
 
 
 
 
 
 h m s 
 
 O / 
 
 e 
 
 + 25 3748 
 
 8.8 
 
 19 6 27 
 
 + 25 3-4 
 
 b 
 
 + 25 3752 
 
 9-5 
 
 19 7 02 
 
 + 25 5i-9 
 
 a 
 
 + 25 3750 
 
 9-5 
 
 19 6 41 
 
 + 25 45-2 
 
 c 
 
 + 25 3755 
 
 8.9 
 
 19 7 44 
 
 + 25 58.1 
 
 TABLE 63. COMPARISON STARS FOR S LYR (!N ORDER OF RIGHT ASCENSION). 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 
 ft 
 
 s 
 
 * 
 
 
 
 
 
 
 e 
 
 -637 
 
 -47.1 
 
 922 
 
 44-2 
 
 
 
 8.40 
 
 8.82 
 
 k 
 
 604 
 
 -44.6 
 
 + 113 
 
 24.6 
 
 
 
 11.18 
 
 ii .60 
 
 r 
 
 -574 
 
 -42.4 
 
 -602 
 
 29.6 
 
 
 
 10.50 
 
 10.92 
 
 I 
 
 -553 
 
 -40.9 
 
 - 28 
 
 24.6 
 
 
 
 ii . 18 
 
 11.60 
 
 a 
 
 -465 
 
 -34-4 
 
 - 35 
 
 34-2 
 
 9.69 
 
 IO. II 
 
 
 
 9 
 
 -371 
 
 -27.4 
 
 -525 
 
 29.6 
 
 
 
 10.50 
 
 10.92 
 
 h 
 
 -326 
 
 -24.1 
 
 + 344 
 
 25.6 
 
 
 
 11.05 
 
 11.47 
 
 i 
 
 -318 
 
 -23-5 
 
 + 463 
 
 32.6 
 
 
 
 10. 06 
 
 10.48 
 
 TV 
 
 -281 
 
 -20.8 
 
 -"5 
 
 23-5 
 
 
 
 H-34 
 
 ii .76 
 
 U 
 
 -281 
 
 20.8 
 
 + H 
 
 24-5 
 
 
 
 II .21 
 
 ii .63 
 
 t 
 
 -241 
 
 -17.8 
 
 + 47 
 
 21 .O 
 
 
 
 II .67 
 
 12.09 
 
 b 
 
 -192 
 
 -14.2 
 
 + 360 
 
 34-3 
 
 9.86 
 
 10.23 
 
 
 
 
 
 22 
 
 - J-5 
 
 + 13 
 
 23 
 
 14.01 
 
 H-43 
 
 
 
 ft 
 
 - 9 
 
 - o-l 
 
 + 8 
 
 o 
 
 var.? 
 
 
 
 
 X 
 
 + 43 
 
 + 3.2 
 
 + 12 
 
 11.4 
 
 12.82 
 
 13-24 
 
 
 
 X 
 
 + 64 
 
 + 4-7 
 
 + 94 
 
 18.4 
 
 12. 18 
 
 12.60 
 
 
 
 A 
 
 + 66 
 
 + 4-9 
 
 - 80 
 
 
 
 
 
 
 I 
 
 + 67 
 
 + 5-0 
 
 -399 
 
 30.6 
 
 10.46 
 
 10.88 
 
 
 
 B 
 
 117 
 
 + 8.6 
 
 - 46 
 
 
 
 
 
 
 s 
 
 -137 
 
 + IO. I 
 
 + 173 
 
 21. 
 
 11.56 
 
 11.98 
 
 
 
 P 
 
 + 170 
 
 + 12.6 
 
 -476 
 
 2 7 .6 
 
 
 
 10.78 
 
 ii .20 
 
 
 
 + 178 
 
 + 13.2 
 
 -177 
 
 24.7 
 
 
 
 II.I8 
 
 ii .60 
 
 D 
 
 + 252 
 
 + 18.6 
 
 i 
 
 21.5 
 
 ii .46 
 
 11.88 
 
 
 
 n 
 
 + 322 
 
 + 23.8 
 
 - 86 
 
 24.7 
 
 
 
 II.I8 
 
 ii .60 
 
 m 
 
 + 346 
 
 + 25.6 
 
 + 58 
 
 25.6 
 
 10.90 
 
 11.32 
 
 
 
 c 
 
 + 369 
 
 + 27.3 
 
 + 739 
 
 42.2 
 
 
 
 8.68 
 
 9. 10 
 
 d 
 
 + 463 
 
 + 34-2 
 
 -837 
 
 
 
 
 
 
 E' 
 
 + 555 
 
 + 41 .0 
 
 -903 
 
 
 6.91 
 
 7-33 
 
 
 
STELLAR PHOTOMETRY. 
 + 30" 
 
 N 
 
 PLATE 8. 
 
 -3<> s 
 
 + 5' 
 
 -5' 
 
 . 
 
 +10' 
 
 \ 
 
 
 
 
 +5 
 
 m 
 
 ' ' 
 
 'A 
 f 
 
 
 w 
 
 a. 
 
 _ r 
 
 5 
 
 ' 
 
 P 
 
 Scale, i mm =7*. 8. os 
 
 S 303 
 
 6894 S LYR^. 
 
 R. A. 1911.9111 [68.3. Dec.+ 25 50' 17", 1900. 
 
 bsr i. 
 
CHAPTER VIII. S 
 
 105 
 
 TABLE 64. 6894 S LYRJB. PHOTOMETER MEASURES OP COMPARISON STARS 
 
 1903 November 7. 6 -INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 c. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 21 17 
 
 21 37 
 
 
 
 33 
 36 
 
 TJt 
 
 11 ai 
 
 ' , 
 
 G at 
 
 G' 
 a 
 b 
 & 
 
 I 
 a 
 G 
 
 G a i 
 
 F / ot 
 
 H'ai 
 H'a, 
 
 15-5 15-0 15 5 
 13.2 13.8 13.4 
 18.7 19.0 18.9 
 
 12.2 12.3 12.7 
 
 31-3 31-6 31-9 
 33.0 32.8 33.0 
 
 37-9 37-2 37-2 
 36.8 37.1 37.4 
 33-9 33-3 33 2 
 32.5 32.4 32.4 
 12.3 12.4 12.8 
 17.8 18.8 18.7 
 
 IO. I IO.I 9.8 
 
 13.9 14.4 14.2 
 15.9 15.6 15.6 
 
 15-33 
 13-50 
 18.87 
 12.40 
 31 -60 
 32-93 
 37-43 
 37-10 
 33-47 
 32-43 
 12.50 
 
 18.43 
 
 IO.OO 
 
 14.17 
 15.70 
 
 15-52 
 13-84 
 18.65 
 
 12.45 
 32.02 
 33-20 
 
 37-27 
 
 i .02 
 
 0.76 
 1.44 
 0.56 
 2.94 
 3-07 
 3-59 
 
 7.87 
 7.61 
 8.29 
 7-41 
 9-79 
 9-92 
 10.44 
 
 8 29 
 8.03 
 8.71 
 7-83 
 
 IO.2I 
 10-34 
 
 10.86 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1903 November 8. Good. 
 
 21 12 
 21 38 
 
 31 
 
 34 
 
 1 
 6 
 a 
 F'a 
 G'o 
 'o 
 H'a 
 H'a 
 E'a 
 G'a 
 a 
 b 
 1 
 
 36. J 36.1 36.3 
 
 33 o 33.7 33.7 
 31.2 31.6 31.6 
 6.0 6.1 5.7 
 17.8 18.3 18.6 
 15.0 14.9 15 o 
 15.4 15.2 16.2 
 16.0 15.2 15.3 
 14.7 15.0 14.8 
 18.8 18.3 18.6 
 31.2 31.0 31.3 
 33.1 32.6 32.9 
 37-i 37 i 37 3 
 
 36-17 
 
 33-47 
 31-47 
 5-93 
 18.23 
 
 14-97 
 15 60 
 I5-50 
 14-83 
 
 18.57 
 3I-I7 
 32-87 
 37-7 
 
 36-67 
 33-17 
 31-32 
 
 3-53 
 3-07 
 2.84 
 0.03 
 i .40 
 0.92 
 
 1. 01 
 
 10.32 
 9.86 
 
 9-63 
 6.82 
 8.19 
 
 7-71 
 7.80 
 
 10.74 
 10.28 
 10.05 
 
 7-24 
 8.61 
 
 8.13 
 
 8.22 
 
 18.40 
 14.90 
 15.55 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 i 
 
 
 1903 November 24. Seeing good; moon 6 days old. 
 
 23 4 
 23 28 
 
 51 
 
 55 
 
 G' 
 
 a 
 6 
 
 ( 
 
 E'ai 
 H'a, 
 H' 
 E'ai 
 
 g 
 b 
 a 
 G' 
 G'a, 
 
 12.3 II-7 12. I 
 31.0 3I.I 31.2 
 3I.I 31.8 32.0 
 
 37-2 37-4 37-3 
 14.2 14.0 14.7 
 15.8 16. i 16.1 
 9.7 10.9 9.9 
 15.1 14.8 14.2 
 38.1 37.8 37.9 
 
 34-i 33-8 33-9 
 33.1 32.2 32.4 
 14.2 13.7 13-9 
 19.8 20. i 19.4 
 
 12.03 
 31.10 
 3 1 63 
 37-30 
 H 30 
 16.00 
 10. 17 
 14-70 
 37 93 
 33-93 
 32-57 
 13-93 
 19.70 
 
 12.98 
 
 31-84 
 32.78 
 37.62 
 14-50 
 
 0.63 
 2.91 
 3.08 
 3.62 
 0.86 
 i. 08 
 0.30 
 
 7-43 
 9-7i 
 9.88 
 10.42 
 7.66 
 7.88 
 7.10 
 
 7-85 
 10.13 
 10.30 
 IO.84 
 8.08 
 8.30 
 7.52 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
io6 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 64. 6894 S LYR^E. PHOTOMETER MEASURES OP COMPARISON STARS.- Continued. 
 
 1902 July 7. 12-INCH. Very good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings 
 
 C. 
 
 Magnitude. 
 
 i 
 Mean of 3 
 
 Mean of 6 
 
 H. 
 
 P. 
 
 h in 
 16 30 
 
 17 25 
 
 O 
 
 A' 
 
 B' 
 
 B (12 
 
 c 
 
 E'a, 
 a 
 b 
 
 g 
 s 
 m 
 s 
 
 g 
 b 
 a 
 ' 
 C' 
 B'a* 
 A' 
 
 '4-7 13-4 13-3 
 10.0 7.8 8.5 
 24.5 26.2 25.7 
 16.8 18.0 18.3 
 16.2 17.9 17.6 
 
 26.9 28.8 28.5 
 30.5 31.0 30.0 
 33.8 32.4 33.0 
 
 44-0 45-3 46-2 
 39-o 39.8 39.2 
 42.2 43.7 44.4 
 
 33-2 34-7 33-8 
 27.2 28.9 27.9 
 28.0 26.2 26.4 
 
 II. 2 14.7 13.9 
 
 16.2 17.5 17.5 
 
 19.5 20.0 19.9 
 II. 2 II. O II. 2 
 
 13.80 
 8.77 
 25-47 
 17.70 
 
 17-23 
 28.07 
 30-50 
 33-07 
 45-17 
 39 33 
 43-43 
 33 - 90 
 28.00 
 26.87 
 13-27 
 17.07 
 19.80 
 11.13 
 
 12.47 
 
 0.72 
 0.32 
 
 2.OI 
 
 1-37 
 I. 08 
 2.41 
 2. 5 8 
 3.02 
 4-25 
 3.69 
 
 8.05 
 7.65 
 9 34 
 8.70 
 8.41 
 
 9-74 
 9.91 
 
 10.35 
 11.58 
 II .02 
 
 8.47 
 8.07 
 9.76 
 9.12 
 
 8.83 
 
 io. 16 
 10.33 
 10.77 
 
 12. OO 
 11.44 
 
 22.84 
 '7-39 
 15-25 
 27.47 
 29-25 
 33 49 
 44-3 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1902 October 5. Seeing good. 
 
 21 5 
 21 57 
 
 
 a 
 b 
 
 g 
 s 
 
 X 
 
 D 
 m 
 E'*, 
 
 C' 
 B' as 
 A'a, 
 A' 
 
 B' ay 
 
 C' 
 E'a, 
 m 
 D 
 
 X 
 
 s 
 
 g 
 
 b 
 a 
 
 19.9 20.9 21 . I 
 22.9 23.2 23.2 
 30.3 30.1 30.4 
 40.3 41.9 41.7 
 
 47-5-47-5 46-7 
 40 . 8 40 . 2 40 . 5 
 33-3 34-6 34.1 
 12.9 13.2 12.9 
 
 H-3 H-3 H-O 
 16.8 16.5 16.8 
 25.1 24.7 25.0 
 6.5 6.9 7.1 
 15.0 15.3 16.8 
 14.1 15.2 14.2 
 lO.j 12.2 II-7 
 
 3'-8 33 5 33-2 
 37-2 37-0 36.7 
 43-8 43-9 43-7 
 40.8 38.8 39.8 
 30.8 31.3 30.6 
 23.7 23.2 22.8 
 
 22.2 21.7 21.5 
 
 20.63 
 23. io 
 30.27 
 41-43 
 47-23 
 40.50 
 34.00 
 13.00 
 14. 20 
 16.70 
 
 24-93 
 6.83 
 15-70 
 
 14-50 
 
 11.47 
 
 32-50 
 36-97 
 43.80 
 39.80 
 30.90 
 23.23 
 21.80 
 
 21 .72 
 23."7 
 30.59 
 40.62 
 
 45 52 
 38.74 
 33-26 
 12.24 
 
 14-35 
 1 6. 20 
 
 I .80 
 2 .04 
 2.71 
 3.85 
 
 4-39 
 3-64 
 3 .00 
 0.70 
 0.91 
 
 I . 22 
 2. 19 
 0-15 
 
 9.62 
 9.86 
 10.53 
 n .67 
 
 12.21 
 II .46 
 10.82 
 8.52 
 8-73 
 9.04 
 IO.OI 
 
 7-97 
 
 10.04 
 10.28 
 
 J0.95 
 12.09 
 12.63 
 11.88 
 ii .24 
 8-94 
 9 15 
 9.46 
 10.43 
 8-39 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1903 November io. Good. 
 
 21 7 
 
 21 27 
 
 29 
 32 
 
 a 
 b 
 
 g 
 s 
 
 X 
 
 m 
 m 
 
 X 
 
 s 
 
 g 
 b 
 a 
 
 </a, 
 
 18.9 18.2 19.0 
 
 19.6 20.3 20. O 
 26.O 26.4 26.1 
 35-8 36.0 35.3 
 42.0 41.2 41.5 
 30.2 30.3 30.2 
 30.7 30.2 30.0 
 41.7 41.3 41.6 
 36.0 35.2 3 4 .2 
 25.2 26.O 25.8 
 
 18.8 18.7 19.0 
 18.7 18.3 17.8 
 8.0 9.1 9.0 
 
 18.70 
 
 19-97 
 26. 17 
 35-70 
 41-57 
 30.23 
 30.30 
 41-53 
 35-13 
 26.00 
 18.83 
 18.27 
 8.70 
 
 18.49 
 19.40 
 26.09 
 35-42 
 41.55 
 30.27 
 
 LSI 
 1.63 
 2-30 
 3-23 
 
 3-95 
 2.68 
 
 9.70 
 9.82 
 10.49 
 ii .42 
 
 12. 14 
 10.87 
 
 IO. 12 
 
 io. 24 
 
 lO.gi 
 II .84 
 12.56 
 11.29 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER VIII. S i,YRJE. 
 
 107 
 
 TABLE 64. 6894 S LVRJB. PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1902 November 3. 40-INCH, WEDGE V. Seeing poor and getting worse. 
 
 Sidereal 
 Time. 
 
 Zen. 
 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Wean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 23 26 
 
 
 ^ 
 
 X 
 
 z 
 
 V 
 ft 
 a 
 a 
 
 v 
 
 Z 
 % 
 S 
 
 33-0 33-i 34-9 
 36.0 37.1 36.1 
 44.8 43.8 43.8 
 57-4 56-4 56-4 
 59-2 59-i 58-3 
 58.6 58.2 58.2 
 58.2 58.7 57.2 
 56.5 56.6 59.8 
 44-8 44.0 45.7 
 41 .8 43.2 41 .0 
 34.0 35.0 35.0 
 
 33.67 
 36.40 
 
 44-13 
 56.73 
 58.87 
 58.33 
 58.03 
 57-63 
 44.83 
 42.00 
 
 34-67 
 
 34- 17 
 39.20 
 44.48 
 57-18 
 
 58.18 
 
 3.10 
 3 69 
 
 4. 26 
 5-35 
 5-43 
 5-41 
 
 H-57 
 12. 16 
 12.73 
 13.82 
 13.90 
 13 88 
 
 11.99 
 12.58 
 
 I3.I5 
 
 14.24 
 
 I4.32 
 14.30 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1902 October 31. 
 
 21 30 
 
 22 
 
 
 S 
 X 
 
 Z 
 
 v 
 ft 
 
 a 
 a 
 
 ft 
 
 v 
 
 Z 
 
 x 
 
 S 
 
 28.3 30.0 30.3 
 32.2 33.2 33.2 
 37-8 39.4 40.8 
 53-5 52.8 52.3 
 57-2 54-5 55-6 
 53-0 50.8 53.0 
 50.7 46.2 47.8 
 50.2 50.2 51.3 
 53-o 52-5 52 3 
 38.0 39.5 37-8 
 33-7 32-8 33.2 
 28.0 29.2 29.4 
 
 29-53 
 32.87 
 39-33 
 52.87 
 
 55-77 
 52.27 
 48.23 
 
 50.57 
 52.60 
 
 38.43 
 
 33-22 
 
 28.87 
 
 29.20 
 33-05 
 38.88 
 52-74 
 53.'7 
 50.25 
 
 2.57 
 2.99 
 3- 6 4 
 5-05 
 5-9 
 4-83 
 
 11.66 
 12.08 
 
 12.73 
 14.14 
 14.18 
 13.92 
 
 12.08 
 12.50 
 I3.I5 
 I4.56 
 14.60 
 14.34 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1902 October 31. Seeing fair. 
 
 22 28 
 
 
 S 
 X 
 
 Z 
 V 
 
 ft 
 
 a 
 a 
 
 ft 
 
 o 
 
 Z 
 X 
 S 
 
 27.0 29.7 31.1 
 32.0 32.8 32.0 
 37.7 38.6 40.0 
 51.7 52.8 52.3 
 56.0 56.7 56.7 
 54-5 55-0 55-2 
 58.2 56.5 57.5 
 55.2 56.0 56.0 
 
 56.5 57-3 55-0 
 44.0 43.9 43.0 
 39 5 37-8 39-9 
 33 9 34-0 35 i 
 
 29.27 
 32.27 
 38.77 
 
 52.27 
 56.47 
 54.90 
 57.40 
 
 55-73 
 56-27 
 
 43-63 
 39-07 
 34-33 
 
 31.80 
 
 35.67 
 41 .20 
 
 54-27 
 56.10 
 
 56.15 
 
 2.84 
 3.26 
 
 3-9' 
 5-i8 
 5-30 
 5 30 
 
 11.66 
 12.08 
 
 12-73 
 14.00 
 
 14. 12 
 14.12 
 
 12.08 
 12.50 
 
 "3-15 
 
 14.42 
 
 14.54 
 "4-54 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 May 20. Good. 
 
 14 50 
 >7 5 
 
 
 a 
 ft 
 
 Z 
 X 
 
 Z 
 
 ft 
 
 a 
 
 Tai 
 
 45.2 47.4 46.5 
 52.0 53.0 52.9 
 37.0 38.6 37.0 
 28.8 29.7 29.9 
 38.7 36.9 37-3 
 55-8 55-9 57-8 
 48.8 46.8 47.2 
 14.7 14.8 14.1 
 
 46.37 
 52.63 
 
 37-53 
 29.47 
 
 37-63 
 56.50 
 47.60 
 14.53 
 
 46.99 
 54-57 
 
 37-58 
 
 4-53 
 5-20 
 3-50 
 2.60 
 
 14. II 
 14.78 
 13.08 
 I2.I8 
 
 14-53 
 15.20 
 I3.50 
 I2.6O 
 
 
 
 
 
 
 
 
 
 
 
 i .00 
 
 10.58 
 
 II .OO 
 
 
io8 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABUS 65. 6894 S LYR^E. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 November 7. 
 
 November 8. November 24. 
 
 C. 
 
 Obs. Mag. 
 
 J Mag. 
 
 C. 
 
 Obs. 
 
 Mag. 
 
 J Mag. 
 
 C. 
 
 Obs. 
 
 Mag. 
 
 J Mag. 
 
 H. P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 E'.. . 
 G'.. . 
 H'. .. 
 
 Means 
 M . .. 
 
 O.OI 
 
 0.62 
 
 0.27 
 
 6.86 7.28 
 7-47 7-89 
 
 7-12 7-54 
 
 .02 
 
 + .07 
 + .04 
 
 + .04 
 - .08 
 + .04 
 
 0.17 
 0.65 
 0.26 
 
 6.96 
 
 7-44 
 7-05 
 
 7.38 
 7.86 
 
 7-47 
 
 + .08 + .14 
 + . 04 . 1 1 
 .11 . 03 
 
 O. I I 
 
 0.63 
 0.32 
 
 6.91 
 
 7-43 
 7.12 
 
 7-33 
 7.85 
 7-54 
 
 + .03 
 + .03 
 - .04 
 
 + .09 
 
 . 12 
 + .04 
 
 0.30 
 
 7-15 7-57 
 6.85 7.27 
 
 .04 
 
 .05 
 
 0.36 
 
 7.'5 
 6.79 
 
 7-57 
 7.21 
 
 .08 .og 
 
 o.35 
 
 7-iS 
 6.80 
 
 7-57 
 7.22 
 
 .03 
 
 .08 
 
 12-INCH. 
 
 40-INCH. 
 
 Star. 
 
 Mag. 
 6-inch. 
 
 C. 
 
 Star. 
 
 Mag. 
 12-inch. 
 
 C. 
 
 July 7. Oct. 5. 
 
 Nov. 10. 
 
 Oct. 31. Oct. 
 
 31- 
 
 Nov. 3. 
 
 May 20. 
 
 a 
 
 9.71 
 9.89 
 10.39 
 
 2.41 i 
 
 2.58 2 
 3.02 2 
 
 80 
 04 
 71 
 
 1-51 
 1.63 
 2.30 
 
 g 
 
 s . 
 
 
 10.46 
 11.56 
 12. 18 
 
 
 
 
 6 
 
 
 2-57 2 
 
 2.99 3- 
 
 84 
 26' 
 
 3 10 
 
 3.69 
 
 2.60 
 
 
 X 
 
 M 
 M 
 
 M 
 
 
 Mean C . 
 Mean Mag 
 M n 
 
 san C . . . 
 
 IO.OO 
 
 2.67 2 
 IO.OO 1O 
 
 7-33 7 
 
 18 
 oo 
 
 82 
 
 1.81 
 
 IO.OO 
 
 8.19 
 
 
 2.78 3. 
 1 1 .87 n. 
 9.09 8. 
 
 05 
 87 
 82 
 
 3 40 
 
 11.87 
 8.47 
 
 2.60 
 
 12. 18 
 
 9-58 
 
 ;ui Mag. 
 
 
 
 
 
 
 .If 
 
 MAGNITUDE,, 
 
 '-* H 
 
 6894- S LYRA.E 
 
 
 FIG. 22. MAGNITUDE-CURVE FOR S 
 
CHAPTER VIII. S LYR^E. 
 
 109 
 
 TABLE 66. 6894 S LYUUB. MEAN MAGNITUDES OF COMPARISON STARS. 
 
 6-INCH. 
 
 Star. 
 
 November 7. 
 
 November 8. 
 
 November 24. 
 
 Mag. 
 
 A Mag. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 4 Mag. 
 
 '.. 
 G' ... 
 H' .. 
 
 a. ... 
 b.... 
 g.... 
 
 6.86 
 7-48 
 7.12 
 
 Mean. 
 
 9-79 
 9.92 
 10.44 
 
 Mean 
 
 0.05 
 + 0.03 
 
 + O.O2 
 
 6.96 
 
 7-44 
 7-05 
 
 + 0.05 
 
 O.OI 
 
 -0.05 
 
 6.91 
 
 7-43 
 7.12 
 
 o.oo 
 
 O.O2 
 + O.O2 
 
 
 
 6.91 
 
 7-45 
 7.10 
 
 7-33 
 7.87 
 7-52 
 
 0.03 
 0.02 
 0.03 
 
 7-15 
 
 7-57 
 
 0.03 
 
 + 0.08 
 -4-0.03 
 + 0.05 
 
 9-63 
 9.86 
 10.32 
 
 0.08 
 -0.03 
 0.07 
 
 9.71 
 9.88 
 10.42 
 
 O.OO 
 O.OI 
 + 0.03 
 
 
 
 9.71 
 9.89 
 10.39 
 
 10.13 
 10.31 
 10.81 
 
 0.05 
 0.02 
 0.05 
 
 IO.OO 
 
 10.42 | 0.04 
 
 
 
 
 
 
 
 
 
 12-INCH. 
 
 Star. 
 
 July 7. 
 
 October 5. 
 
 November 10. 
 
 Mag. 
 
 A Mag. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag.H. 
 
 Mag. P. 
 
 A Mag. 
 
 a 
 b 
 g 
 
 s. . . . 
 
 9-74 
 9.91 
 
 10.35 
 Mean. 
 
 11.58 
 
 + 0.05 
 + 0.05 
 0.09 
 
 9.62 
 9.86 
 10.53 
 
 0.07 
 o.oo 
 +0.07 
 
 9.70 
 9.82 
 10.49 
 
 + O.OI 
 
 0.04 
 + 0.03 
 
 
 
 9.69 
 9.86 
 10.46 
 
 IO. I I 
 
 10.27 
 10.88 
 
 0.04 
 0.03 
 0.06 
 
 IO.OO 
 
 10.42 
 
 0.04 
 
 + O.O2 
 
 ii .67 
 
 12.21 
 10.82 
 II .46 
 
 + O. II 
 
 +0.03 
 0.08 
 
 ii .42 
 12.14 
 10.87 
 
 o. 14 
 0.04 
 -0.03 
 
 
 
 II .56 
 12.18 
 10.90 
 II .46 
 
 11.98 
 12.60 
 11.32 
 11.88 
 
 0.09 
 0.02 
 0.08 
 
 m . . . 
 n 
 
 u .02 
 
 + 0.12 
 
 
 
 
 
 
 Mean 
 
 
 
 
 
 
 
 "55 
 
 "97 
 
 0.06 
 
 
 
 
 
 
 
 
 40-INCH. 
 
 Star. 
 
 October 31. 
 
 October 31. 
 
 November 3. 
 
 May 20. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 JMag. 
 
 s. . . . 
 x. . . . 
 
 i. . . . 
 
 a .... 
 ft. ... 
 
 11.66 
 12.08 
 
 Mean. 
 
 12-73 
 13.92 
 14. 18 
 
 + 0.03 
 0.04 
 
 11.66 
 12.08 
 
 + 0.03 
 0.04 
 
 11-57 
 
 12. l6 
 
 0.06 
 + 0.04 
 
 12. 18 
 
 + 0.06 
 
 11.63 
 
 12.12 
 
 12.05 
 12.54 
 
 0.04 
 0.04 
 
 11.88 
 
 12.30 
 
 0.04 
 
 0.09 
 0.09 
 
 12.73 
 
 14. 12 
 14. 12 
 
 0.09 
 
 + O.II 
 
 12.73 
 13-88 
 13.90 
 
 0.09 
 -0.13 
 
 13.08 
 14. ii 
 14.78 
 
 + 0.26 
 + o. 10 
 
 12.82 
 14.01 
 var? 
 
 13-24 
 '4-43 
 
 0.13 
 
 O. I I 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
no 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 67. 6894 S LYR.B. VISUAL OBSERVATIONS OF THE VARIABLE. 
 
 No. 
 
 Date. 
 
 b 
 
 JS 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 i 
 
 2 
 
 3 
 4 
 5 
 
 6 
 
 7 
 8 
 
 9 
 10 
 ii 
 
 12 
 13 
 14 
 15 
 
 16 
 
 17 
 
 18 
 
 19 
 
 20 
 
 21 
 22 
 
 23 
 
 24 
 
 25 
 26 
 
 27 
 28 
 
 29 
 30 
 31 
 32 
 
 33 
 34 
 35 
 
 36 
 
 37 
 38 
 39 
 40 
 
 4' 
 42 
 43 
 44 
 45 
 46 
 47 
 48 
 49 
 50 
 5' 
 52 
 53 
 
 1896 
 Oct. 7 
 
 Nov. 12 
 
 26 
 
 Dec. 9 
 23 
 
 1897 
 Jan. 9 
 May 25 
 June ii 
 July i 
 16 
 26 
 Aug. 27 
 Sept. 17 
 
 22 
 
 Oct. 25 
 Nov. 1 6 
 Dec. 29 
 
 1898 
 Feb. 15 
 Mar. 2 
 
 Apr. i 
 
 15 
 
 May 7 
 
 21 
 
 June 14 
 27 
 July 5 
 18 
 Aug. i 
 18 
 Sept. 7 
 
 20 
 
 Oct. 8 
 Nov. i 
 15 
 
 1899 
 Mar. 22 
 Apr. 21 
 May i 
 18 
 29 
 June 7 
 '3 
 
 July 5 
 
 July 10 
 18 
 Aug. 5 
 10 
 26 
 Sept. 4 
 
 12 
 
 26 
 Oct. 4 
 
 23 
 
 7 
 6 
 6 
 
 9 
 
 10 
 
 9 
 9 
 9 
 9 
 
 8 
 8 
 8 
 
 7 
 6 
 6 
 
 17 
 17 
 16 
 16 
 16 
 10 
 
 9 
 
 ii 
 ii 
 10 
 
 IO 
 
 8 
 8 
 
 6 
 
 7 
 
 16 
 16 
 
 IO 
 IO 
 
 9 
 
 10 
 10 
 10 
 10 
 
 9 
 9 
 9 
 9 
 9 
 7 
 8 
 8 
 7 
 
 2410000+ 
 3840 
 
 3876 
 3890.54 
 3903-50 
 3917.50 
 
 3934.63 
 4070.67 
 4087 . 63 
 4107.63 
 4122.63 
 4132.63 
 4164.58 
 4185.58 
 4190.56 
 4223-54 
 4245-50 
 4288.50 
 
 4336 96 
 4351-96 
 4372.92 
 4381.92 
 4395-92 
 4417.67 
 
 4431-63 
 
 4455 
 4468 
 4476.71 
 4489.71 
 4503-67 
 4520.67 
 4540.58 
 4553-58 
 4571-54 
 4595-50 
 4609.54 
 
 4736.92 
 4766.92 
 4776.67 
 
 4793-65 
 4804.63 
 4813.67 
 4819.65 
 4841 .67 
 4846.65 
 4854.61 
 4872.63 
 4877.61 
 4893.61 
 4902 . 6 i 
 4910.54 
 4924-56 
 4932 56 
 4951-54 
 
 80 
 
 150 
 150 
 150 
 150 
 
 80 
 150 
 150 
 150 
 150 
 150 
 150 
 80 
 150 
 150 
 150 
 150 
 
 150 
 150 
 150 
 150 
 150 
 40 
 1 40 
 (150 
 80 
 80 
 80 
 80 
 80 
 80 
 
 'So 
 150 
 200 
 
 200 
 150 
 200 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 5o 
 150 
 150 
 150 
 150 
 'So 
 'So 
 
 6 
 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 12 
 12 
 12 
 12 
 12 
 12 
 6 
 6 
 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 (a2b, btf, /2g, g$h, hik, kl 
 -'giq, qr, gj,p, p2tn, mn, no 
 
 ) 
 
 <2I 
 <2I 
 
 <i8 
 
 <i8 
 
 21 .O 
 
 28.0 
 26.1 
 24.2 
 20.3 
 20.2 
 
 '97 
 17-4 
 12.4 
 
 8.9 
 <i9 
 <n 
 <n 
 
 <i8 
 20. o 
 
 26.7 
 31.5 
 31.9 
 32.0 
 
 32.4 
 
 27.8 
 
 31 2 
 26.8 
 26.8 
 25.2 
 21.3 
 18.3 
 17-5 
 17.2 
 IO.4 
 
 <n 
 
 <i7 
 18.2 
 20. o 
 
 21.5 
 
 23.7 
 25.7 
 
 29.6 
 
 33- ' 
 30-9 
 30 9 
 30-9 
 28.6 
 28.6 
 26.9 
 
 25-7 
 
 24.4 
 
 22.8 
 2!. 6 
 
 <ii.6 
 <n.6 
 
 <I2.I 
 <I2.I 
 
 11.68 
 
 10. 72 
 
 10 99 
 11.25 
 11.77 
 11.78 
 11.86 
 12.15 
 12.79 
 13-25 
 <ii-9 
 <i3-o 
 <I3 o 
 
 <I2.I 
 
 1 1. 80 
 10.91 
 
 IO.2O 
 IO.I7 
 
 10. 16 
 10.09 
 
 10.77 
 
 10. 27 
 10.90 
 10.90 
 II . IO 
 
 11.62 
 12.03 
 12.13 
 12.17 
 13.03 
 
 <i3-o 
 
 <I2.2 
 12.05 
 11.80 
 II. 6O 
 11.32 
 
 11-05 
 10.50 
 
 9 99 
 10.31 
 10.31 
 10.31 
 10.65 
 10.65 
 10.89 
 11.03 
 ii .20 
 ii .42 
 ii 59 
 
 good 
 good 
 moon 
 good 
 
 low 
 good 
 good 
 good 
 good 
 fair 
 fine 
 fine 
 fine 
 good 
 fine 
 good 
 
 good 
 fine 
 good 
 good 
 good 
 fair 
 
 fair 
 
 fair 
 good 
 good 
 fair 
 moon 
 fair 
 good 
 fair 
 fine 
 good 
 good 
 
 good 
 low 
 low 
 good 
 low 
 good 
 good 
 good 
 moon 
 fair 
 good 
 good 
 good 
 good 
 good 
 poor 
 good 
 
 o 
 
 36 
 
 77 
 
 94 
 230 
 
 247 
 267 
 282 
 292 
 324 
 345 
 350 
 
 76 
 96 
 1 06 
 1 20 
 
 HI 
 155 
 
 179 
 192 
 200 
 
 213 
 227 
 
 244 
 264 
 
 277 
 295 
 3i9 
 
 54 
 64 
 81 
 92 
 
 IOI 
 
 107 
 129 
 134 
 142 
 160 
 
 165 
 181 
 190 
 198 
 
 212 
 2 2O 
 239 
 
 + 0. II 
 
 -0.36 
 
 O.2I 
 
 o. 24 
 
 0.09 
 
 -0-34 
 0.46 
 -0.85 
 
 -0.66 
 -0.27 
 
 + 0.20 
 -0.13 
 -0.59 
 -0.31 
 0.05 
 
 o. 14 
 +0.30 
 
 0.46 
 
 +0.13 
 0.07 
 0.07 
 +0.32 
 
 + O.22 
 + O. IO 
 -0.23 
 
 + o. 15 
 
 -0.25 
 
 o. 18 
 + 0.18 
 + 0.15 
 + 0.15 
 0.29 
 
 -0.33 
 + 0.04 
 
 + O. IO 
 
 + o 03 
 
 +0.33 
 +0.15 
 +0.29 
 +0.32 
 +0.27 
 +0.35 
 +0.26 
 
 ) 
 
 Uiw UT,4.t 
 
 
 
 
 
 
 
 0457', 657;, 7)3/ vih 
 
 29.7, 29.0, 27.6, 26.6 
 25.6, 26.6 
 
 g57), vim ... . 
 
 7/4 s, 01 2v, m2v 
 
 VS, V2X m6v 
 
 25.0, 24.2, 23.6. ... 
 
 21 .O, 2O.4, 19.6. ... 
 
 SIV, V2X 
 SIV, VIX 
 
 xiv v glimpsed 
 
 20. o, 20.4 
 20. o, 19.4 
 
 *3-47>, zi-27) 
 .22 37;, V glimpsed 
 
 14-9, 99 
 
 v not seen, limit 1-2 < A 
 
 
 
 i) not seen, limit z 
 
 
 11 not seen limit x 
 
 
 7140, 7)2 s, Div, t3 47) 
 7)2 wt, vi n, 7)6$ 47) , 
 
 15.4, 23.0, 20-5, 22. I 
 
 27-6, 25.7, 27.0,26.6 
 
 30.7, 31.6, 32.3. ... 
 32.6, 31.3 
 31.2, 32.3. 32.6. ... 
 
 32.3, 33-6 > 
 31-3. 32-6 j 
 28.6, 27. i 
 
 v(>n, vig, &27) 
 
 7)2g, 637; , 
 0471, 6271, 7>2g 
 
 627;, 7<3g 
 
 b$V, V2g 
 g2V, V1-2W 
 
 64-571, V2g, limit 3 < z 
 g4-57), V2m, c8a, eioa 
 
 g4T>, 7)1 2m 
 
 g47>, mzv, Tin . 
 
 29-8, 32.6 
 26. i, 27.6 
 26.6, 27.1 
 26.6, 23.6, 25.6.. .. 
 
 19.6, 22. O, 22.4. ... 
 18.6, 19.0, 20.4, 15. .( 
 
 m6v, vis, v^x, limit z 
 mf> 87), S2v, Ti2x, 7142, limit z . 
 v glimpsed, $3 47; .... 
 
 S2v, vx, 7>3z, limit z 
 zii), v glimpsed 
 
 19.0, 18.4, 14.4.. . 
 
 v not seen, limit z 
 
 
 v not seen limit 12 < x 
 
 
 v2 3z, vix, vs, Dyv 
 
 .13.9, 19.4, 21.0, 18.5 
 2O.O, 2O.O 
 
 23-5, '95 
 24.0, 24.6, 22.5.. .. 
 
 25.0, 26.6, 26. I .... 
 
 28.1, 30.6, 30.3 
 
 33 3, 33-' 
 30.3, 3'.6 
 30-3, 3'.6 
 
 SIV, V2X 
 
 7)2-3$, D2V, uncertain 
 7)3$, mm, viD 
 7)4/2, vim, 457? 
 
 7>2 3t, 7>g, 647) 
 637>, 7>2-3g 
 
 6471, 7)ig 
 6471, 7>ig 
 
 b6v, g2-yv, V4m 
 g27>, -ayn 
 g47), vim, 716-7$ 
 g47), vm, 7)4$ 
 g7~ 871, vm, 7134$ 
 m2v, vis 
 
 TO2-37), 7IO-I$, V2X 
 
 28.3, 28. i, 29.6.. . . 
 28.6, 28.6 
 26.6, 26.6, 27.5.. .. 
 26.6, 25.6, 25.0. ... 
 23.1, 25.6, 24.5... . 
 
 23.6, 22.0 
 23.1, 21.5, 20.4-. . . 
 
CHAPTER VIII. S LYR^E. 
 
 Ill 
 
 TABLE 67. 6894 S LYR.B. VISUAL OBSERVATIONS OP THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 V 
 B 
 
 i 
 
 B 
 
 B. 
 
 < 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C.S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 54 
 55 
 56 
 
 57 
 
 58 
 59 
 60 
 61 
 62 
 63 
 64 
 65 
 66 
 
 67 
 68 
 69 
 70 
 7' 
 72 
 73 
 74 
 75 
 
 76 
 
 77 
 78 
 79 
 80 
 81 
 82 
 83 
 4 
 
 85 
 86 
 
 87 
 
 88 
 89 
 90 
 
 91 
 92 
 
 93 
 94 
 95 
 96 
 97 
 
 98 
 99 
 too 
 
 IOI 
 
 iS99 
 Oct. 30 
 Nov. 6 
 
 20 
 22 
 
 igOO 
 
 Feb. 24 
 Mar. 2 
 
 22 
 
 Apr. 4 
 6 
 May 2 
 IT 
 28 
 29 
 June 19 
 28 
 Aug. 6 
 
 13 
 20 
 Sept. 5 
 
 15 
 Oct. 26 
 Nov. 21 
 
 1901 
 Nov. 12 
 
 1902 
 Mar. 5 
 28 
 May 14 
 July 7 
 Oct. 5 
 
 10 
 
 20 
 
 3i 
 Nov. 3 
 Dec. i 
 23 
 
 1903 
 Oct. 10 
 ii 
 13 
 
 1904 
 May 17 
 20 
 Aug. 4 
 27 
 Sept. 24 
 Oct. 8 
 Nov. 30 
 
 1905 
 Jan. 3 
 Feb. 14 
 Mar. 12 
 
 Apr. 4 
 
 6 
 6 
 6 
 
 7 
 
 18 
 16 
 IS 
 i5 
 16 
 
 '5 
 14 
 10 
 
 12 
 12 
 IO 
 
 9 
 9 
 
 8 
 8 
 
 7 
 6 
 6 
 
 7 
 
 16 
 '4 
 13 
 
 10 
 
 9 
 9 
 
 8 
 
 7 
 8 
 
 7 
 
 IO 
 
 7 
 9 
 
 ii 
 
 9 
 8 
 
 8 
 IO 
 
 6 
 
 6 
 
 17 
 16 
 
 16 
 
 2410000+ 
 4958.50 
 4965 50 
 4979-50 
 4981.54 
 
 5075 98 
 5081.92 
 5101.85 
 5114.88 
 5116.92 
 5142.88 
 5151-83 
 5168.67 
 5169 75 
 5190 75 
 5I99-67 
 5238-63 
 5245-63 
 5252-58 
 5268.58 
 5278-54 
 5319 50 
 5345 50 
 
 5701-54 
 
 5814.92 
 
 5837-83 
 5884.79 
 5938.67 
 6028.63 
 6033.63 
 6043.58 
 
 6054.54 
 
 6057 . 58 
 6084 
 6107.54 
 
 6398.67 
 
 6399-54 
 6401 .63 
 
 6618.71 
 6621 .63 
 6697.58 
 6720 
 6748.58 
 6762.67 
 6815.50 
 
 6849.50 
 6891 .94 
 6917.94 
 
 6940.92 
 
 150 
 150 
 
 200 
 
 175 
 275 
 350 
 275 
 35 
 460 
 460 
 275 
 237 
 350 
 237 
 150 
 150 
 40 
 40 
 150 
 150 
 150 
 
 350 
 
 237 
 237 
 67 
 67 
 67 
 237 
 237 
 
 237 
 237 
 
 237 
 
 67 
 150 
 80 
 
 40 
 237 
 150 
 150 
 
 237 
 40 
 
 750 
 750 
 750 
 (237) 
 *75oi 
 
 6 
 6 
 6 
 6 
 
 12 
 12 
 40 
 12 
 40 
 40 
 4 
 12 
 4 
 40 
 40 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 40 
 
 40 
 
 40 
 
 12 
 
 12 
 12 
 4 
 40 
 
 40 
 
 40 
 
 24 
 40 
 
 12 
 
 6 
 
 12 
 
 6 
 
 40 
 
 6 
 6 
 
 24 
 40 
 6 
 
 40 
 40 
 40 
 
 40 
 
 m6v, vs 
 
 S2V, VO-IX 
 
 v not seen, limit 2 < s 
 
 S211, V2X, 7TJ2 
 
 v suspected, limit 4 < z 
 
 19.6, 21 .0 
 19.0, 18.9 
 
 20.3 
 18.9 
 <I9 
 17-9 
 
 < 7 
 
 < 6 
 0.6 
 
 2 
 - 4.0 
 - 4.0 
 - 4.0 
 
 < 6 
 3-3 
 7-8 
 12.4 
 23-5 
 26.5 
 30.6 
 32-5 
 31-8 
 3-9 
 28.1 
 
 26.6 
 
 24.6 
 21.4 
 <i8. 
 7-9 
 <n 
 i 
 
 11.77 
 11.96 
 <n.g 
 12.08 
 
 03-5 
 <J3-6 
 14.27 
 14. i 
 14.87 
 14.87 
 14.87 
 <i3-6 
 '3 95 
 '3-39 
 12.78 
 
 "35 
 10.95 
 10.35 
 10.07 
 10. 19 
 10. 18 
 10.70 
 
 10.94 
 
 ii. 19 
 ii .60 
 
 <I2.I 
 
 I3-38 
 
 <i3 o 
 
 14. 2 
 I4.O2 
 
 14.07 
 
 13-82 
 15-0 
 11.87 
 
 <I2 . 2 
 
 O3 o 
 
 <I3- 
 IO.2O 
 
 9-74 
 ii .76 
 12.03 
 
 H 
 13.2 
 
 <I2.I 
 
 14.67 
 15-05 
 14.87 
 
 H 59 
 
 fair 
 good 
 
 246 
 253 
 
 + 0.28 
 + 0.34 
 
 19.0, 20.4, 14.4 
 
 good 
 
 fair 
 
 good 
 good 
 fair 
 fair 
 fair 
 good 
 good 
 poor 
 good 
 moon 
 good 
 poor 
 fair 
 good 
 good 
 poor 
 
 good 
 
 fair 
 good 
 good 
 good 
 good 
 moon 
 fair 
 
 fair 
 poor 
 
 good 
 
 moon 
 good 
 good 
 
 good 
 good 
 fair 
 good 
 fair 
 fair 
 good 
 
 fair 
 fair 
 fair 
 
 good 
 
 269 
 
 389 
 
 404 
 430 
 3 
 
 21 
 42 
 51 
 
 90 
 97 
 
 IO2 
 1 2O 
 130 
 
 17! 
 '97 
 
 "7 
 
 231 
 253 
 
 354 
 
 8 
 
 13 
 
 23 
 
 34 
 
 37 
 64 
 87 
 
 89 
 
 162 
 '65 
 241 
 266 
 292 
 306 
 
 393 
 o 
 
 25 
 
 48 
 
 +0.18 
 
 -0.13 
 
 + 0.18 
 + 0.06 
 
 + O. IO 
 
 0.40 
 + 0.51 
 + 0.38 
 + 0.15 
 -0.05 
 
 -0.54 
 0.42 
 
 O. II 
 O.2I 
 O.O2 
 
 + 0-39 
 
 O.O4 
 O.O2 
 
 -0.25 
 O.O4 
 
 -0.18 
 
 + 0.77 
 + 0.63 
 
 + 0.57 
 
 O. IO 
 
 -0.58 
 +0.25 
 +0.19 
 
 + o.5 
 
 
 
 | 
 
 4-0.17 
 + 0.25 
 +0.77 
 
 + 1.99 
 
 v not held, limit 5 < z 
 
 
 27), 7)10 
 
 0.3, i .0 
 
 7; or a glimpsed at limit 
 
 
 28 io, ^ 40, 047; 
 
 
 27 8, a i#, 47; . 
 
 
 020 047; 26 S a 
 
 
 TI not seen, limit 5-6 < z 
 
 
 ZIW, 7>3< I 2fl 
 
 I . 4. S . "V . 
 
 041), 7)6, 03-4^ 
 x6v, -viz 
 myv, -v-zD, v6x 
 vf>--js, ti^m, v$D, tin 
 T^tn, i)g 
 
 7-4, 8.3 
 12.4, 12.4 
 22.6, 23.5, 24.4 
 27.5, 28.6, 25.5, 24.7 
 3o 6 ^o . 6 . .... 
 
 037;, 61-27;, -D3g 
 byv, vg, T>6m 
 
 31.2, 32.8, 33.6 
 33-3. 30-6, 31.6 
 3i-2,33- 3,31-6,30-6 
 26.6, 29.6 
 
 037;, biv, vig, tiftm, 
 
 g47>, z>4t 
 2457; 
 
 m27J, 7)4/7 . . . 
 
 2l6 2 ^ ^ 
 
 vyc, vs, vD, myv 
 
 21 .4, 21 .O, 21 .5, 21 .6 
 
 1} not seen, x seen . 
 
 23-47;, v glimpsed 
 
 
 v not seen, limit 2 
 
 
 7Ja4j, 7)0J- 
 
 2, O 
 
 photometer 
 
 
 f photometer. ) 
 
 
 
 
 photometer 
 
 
 
 photograph 
 
 
 
 S2T1, 112X 
 
 "v not seen limit i < x 
 
 ig.O, 20.4 
 
 19.7 
 
 <i7 
 <n 
 
 <IO 
 
 3-7 
 
 "v not seen, limit z 
 
 
 v not seen, limit i < 2 
 
 
 63-47;, V2g 
 photometer 
 
 30.8, 32.6 
 
 siv v2yc 
 
 20. o, 20 9 
 
 20.4 
 18.2 
 
 syv, vx 
 photographs .... 
 
 18.0, 18.4 
 
 247;, 7MO-I20, 050 
 
 v not seen limit x 
 
 7-4, 13-3 
 
 9 
 <i8 
 
 -2.5 
 -5-5 
 -4.0 
 
 0.0 
 
 
 
 a^ 40, 0567; near limit 
 
 
 40, 047> 
 
 
 f "2-37;, ri0 
 
 0.2, I.O ) 
 
 \ 147;, 7)0 
 
 -1.7, o.o ) 
 
112 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 67. 6894 S LYR.S. VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 /. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S.T. 
 
 Julian 
 Day. 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 102 
 
 103 
 104 
 
 105 
 1 06 
 107 
 1 08 
 109 
 
 no 
 
 I II 
 
 112 
 
 U3 
 114 
 
 "5 
 
 116 
 117 
 
 118 
 119 
 
 '90S 
 Apr. 1 1 
 
 30 
 May 20 
 June 13 
 
 20 
 
 24 
 26 
 July 23 
 26 
 Aug. 9 
 
 21 
 22 
 
 25 
 28 
 
 Sept. 17 
 Oct. i 
 20 
 Nov. 1 8 
 
 16 
 
 14 
 10 
 
 H 
 
 12 
 
 9 
 
 IO 
 IO 
 
 9 
 9 
 9 
 9 
 
 IO 
 
 8 
 7 
 
 10 
 
 7 
 6 
 
 2410000+ 
 6947.92 
 
 6966.83 
 6986.67 
 7010.83 
 
 7017-75 
 7021.63 
 7023.67 
 7050.67 
 
 7053-63 
 7067.63 
 7079-63 
 7080.6 
 7083.67 
 7086 59 
 7106.55 
 7120.67 
 
 7'39 54 
 7168.50 
 
 750 
 
 237 
 237 
 237 
 237 
 80 
 80 
 237 
 150 
 >50 
 
 150 
 150 
 
 237 
 80 
 237 
 
 40 
 
 40 
 40 
 40 
 40 
 
 12 
 12 
 40 
 6 
 
 6 
 
 12 
 12 
 12 
 
 6 
 6 
 40 
 
 12 
 40 
 
 / 7)43, 1)1", Z is 2" > V. ..\ 
 
 ( z8i>, 7)4" ) 
 
 4 O 1 ^ . . 
 
 3-5 
 
 5-3 
 15-4 
 30.6 
 
 32.4 
 25 9 
 28.4 
 
 '3-9' 
 
 13 69 
 
 12.40 
 
 i 34 
 10. 06 
 n .01 
 10.67 
 to.6 
 1 1. 20 
 10.79 
 <io.5 
 n. 7 
 11.7 
 n . 16 
 11.41 
 11.85 
 11.71 
 3 05 
 
 good 
 
 good 
 good 
 good 
 good 
 poor 
 good 
 good 
 good 
 good 
 fair 
 good 
 
 good 
 good 
 fair 
 good 
 good 
 
 55 
 
 74 
 94 
 118 
 
 125 
 129 
 
 3' 
 
 158 
 161 
 
 175 
 187 
 1 88 
 191 
 194 
 214 
 228 
 
 247 
 276 
 
 + 1.60 
 
 + 2.O7 
 
 + 1-31 
 
 -0.17 
 -0.32 
 
 +0.68 
 -0.37 
 + o.3 
 +0.90 
 
 + 0.37 
 
 + 1.1 
 + 1.1 
 +0.46 
 + 0.42 
 + 0.65 
 
 + O. 21 
 + I.O2 
 
 3.4, 6.3. 
 
 z&v, 7/4* 
 
 X2TJ 1/32 
 
 l6.4.. 14. A. 
 
 T)tr 4- 
 
 
 b2W. V2.~\e . . 
 
 11 .8. 11. I. . 
 
 
 25 6 26 i 
 
 g2V, TJ2-3W 
 
 photometer 
 
 28.6, 28. I 
 
 miv, "V2D, 1/4 $s 
 g4v t v^m 
 photographs 213, 214 . . 
 
 24.6, 23.6, 25.5 
 26.6, 28.6 
 
 24-3 
 27.6 
 
 photographs, 215, 216 
 
 
 
 photographs, 221, 222 
 
 
 
 
 
 24.7 
 22.9 
 19.7 
 20.7 
 10.4 
 
 1TI2V, VlD, VI-2S 
 S2V, V2X 
 
 23.6, 22.5, 22.5 
 19.0, 20.4 
 
 
 
 
 
CHAPTER VIII. S LYRA. 
 
 00 
 
 o 
 
 ei 
 
 CO 
 > 
 
 p 
 
 2 
 
 Fio. 33. LIGHT-CURVE OP S Lvn*. 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 68. 6894 S LYR^E. MEAN MAGNITUDES PROM 36$ DAY GROUPS. 
 
 Group No 
 J D 
 
 i 
 
 16 
 
 2 
 77 
 
 3 
 
 IOQ 
 
 4 
 
 145 
 
 5 
 182 
 
 6 
 
 218 
 
 7 
 2 54 
 
 8 
 291 
 
 9 
 327 
 
 IO 
 
 363 
 
 :i 
 
 400 
 
 12 
 
 436 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r t 
 
 
 
 8s 
 
 
 
 
 2-<8 
 
 272 
 
 108 
 
 -148 
 
 
 
 M 
 
 
 
 I I 2O 
 
 
 
 
 I I . I 2 
 
 II .78 
 
 12 .OO 
 
 13 . O2 
 
 
 
 3 8 40 \ J M 
 
 
 
 O. 12 
 
 
 
 
 O.22 
 
 O. 22 
 
 -0.66 
 
 o. 46 
 
 
 
 I. No 
 
 
 
 2 
 
 
 
 
 2 
 
 2 
 
 2 
 
 2 
 
 
 
 f t 
 
 
 
 
 
 167 
 
 202 
 
 2^.6 
 
 27O 
 
 7Q7 
 
 
 
 
 M 
 
 
 
 
 
 
 
 IT -?6 
 
 12 08 
 
 12 60 
 
 
 
 
 4*76 i JM 
 
 
 
 O 17 
 
 o 18 
 
 o 08 
 
 O I 1 
 
 + O 12 
 
 + o. 16 
 
 o 04 
 
 
 
 
 L No 
 
 
 
 
 
 
 
 2 
 
 2 
 
 2 
 
 
 
 
 47- ( A 
 I No. 
 
 r t 
 
 I 2 
 
 59 
 ii .92 
 
 O.22 
 2 
 
 46 
 
 95 
 
 II. 12 
 + 0.05 
 
 4 
 96 
 
 135 
 10.20 
 O.O6 
 
 3 
 
 125 
 
 169 
 
 10.54 
 4-0.17 
 
 3 
 
 171 
 
 200 
 ii .04 
 + 0.29 
 3 
 
 IO7 
 
 240 
 11.68 
 + 0-3I 
 
 4 
 
 269 
 12.08 
 4-0.18 
 I 
 
 
 
 389 
 14.27 
 -0.13 
 i 
 
 417 
 14.87 
 4-O. 12 
 
 2 
 
 M 
 
 
 I 7 08 
 
 10 85 
 
 
 10 18 
 
 
 
 
 
 
 
 
 5'4i jJJ 
 
 
 
 O I 5 
 
 
 O 21 
 
 
 
 
 
 
 
 
 1 No 
 
 
 2 
 
 a 
 
 2 
 
 I 
 
 
 
 
 
 
 
 
 f t 
 
 
 
 
 117 
 
 
 
 242 
 
 
 
 "*54 
 
 
 
 M 
 
 
 
 
 
 
 
 
 
 
 j-i -18 
 
 
 
 5584 ^ J M 
 
 
 
 
 -l-O 1.Q 
 
 
 
 o ot 
 
 
 
 O 2S 
 
 
 
 No 
 
 
 
 
 
 
 
 2 
 
 
 
 I 
 
 
 
 r < 
 
 21 
 
 57 
 
 87 
 
 
 
 
 
 
 
 
 
 
 M 
 
 14 10 
 
 n 82 
 
 ii 8? 
 
 
 
 
 
 
 
 
 
 
 6020 JM 
 
 + o 06 
 
 + o 63 
 
 -4-O 57 
 
 
 
 
 
 
 
 
 
 
 L No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r * 
 
 
 
 
 
 164. 
 
 
 24.1 
 
 266 
 
 ^06 
 
 
 3Q-1 
 
 
 M 
 
 
 
 
 
 9,07 
 
 
 II . 76 
 
 12 .03 
 
 IV2 
 
 
 14.67 
 
 
 6 45 j JM 
 
 
 
 
 
 
 
 ~f~o 25 
 
 4~O 19 
 
 4-o 5 
 
 
 O 17 
 
 
 L No 
 
 
 
 
 
 
 
 
 I 
 
 i 
 
 
 
 
 !( 
 
 25 
 
 
 
 
 
 
 
 
 
 
 
 
 M 
 
 14. 8? 
 
 
 
 
 
 
 
 
 
 
 
 
 JM 
 
 4-o 77 
 
 
 
 
 
 
 
 
 
 
 
 
 No 
 
 I 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r i 
 Means i JM 
 
 t No. 
 
 20 
 
 14.46 
 
 -fo. 13 
 8 
 
 47 
 
 12. 6l 
 + O.2I 
 
 5 
 
 91 
 II .20 
 -0.03 
 13 
 
 127 
 10.36 
 
 O. IO 
 
 8 
 
 168 
 10.28 
 0.06 
 
 8 
 
 2OO 
 I0.8l 
 4-0.07 
 
 7 
 
 239 
 ii .46 
 
 4-o. ii 
 ii 
 
 270 
 
 11.99 
 
 + 0.04 
 6 
 
 307 
 12.48 
 0.26 
 5 
 
 35 
 13 20 
 
 -0.39 
 
 3 
 
 391 
 14-47 
 4-O.O2 
 2 
 
 4'7 
 14.87 
 
 4-o. 12 
 
 2 
 
CHAPTER VIII. S LYR^E. 
 
 10 
 
 too zoo 
 
 DAYS 
 
 400 500 
 
 12 
 
 u 
 
 Q 
 
 i 
 
 <s 
 
 6894 S LYRAE 
 j 
 
 Miii'-4Z9 d 
 M-m~IS4d 
 
 /4 
 
 /s 
 
 FIG. 24. MEAN LIGHT-CURVE OF S LYR.S 
 
n6 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 69. 6894 S LYRB. OBSERVED MAXIMA AND MINIMA. 
 
 Elements of maximum. 1898 May 12 (J. D. 2414422)+ 438* (E-4). M-m^l 
 
 MAXIMA. 
 
 MINIMA. 
 
 I 
 
 W 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 wt. 
 
 t 
 W 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P - 
 
 Calendar. 
 
 J.D. 
 
 H. 
 
 P. 
 
 3 
 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 10 
 
 1897 Mar. 4 
 1898 May 12 
 1899 July 7 
 1900 Sept. 29 
 1901 Dec. 26 
 1903 Mar. 12 
 1904 May 23 
 1905 July 2 
 
 3988 
 4422 
 
 4843 
 5292 
 
 5745 
 6186 
 6624 
 7029 
 
 
 me 
 10.37 
 10.42 
 10.46 
 me 
 me 
 me 
 ii .02 
 
 + 4 
 o 
 
 -i? 
 - 6 
 
 + 9 
 
 + 12 
 
 + 12 
 + 21 
 
 7 
 
 20 
 
 27 
 
 9 
 
 3 
 
 i 
 
 3 
 24 
 
 4 
 5 
 6 
 
 8 
 
 9 
 10 
 
 1897 Dec. 19 
 1899 Feb. 13 
 1900 Apr. 25 
 1901 July 14 
 1902 Sept. 25 
 1903 Dec. 13 
 1905 Feb. 1 8 
 
 4278 
 4699 
 
 5135 
 558o 
 6018 
 6462 
 6995 
 
 
 me 
 
 me 
 
 I5-32 
 me 
 
 I5-32 
 me 
 
 "5-43 
 
 + 10 
 - 7 
 - 9 
 
 2 
 
 + 4 
 
 6 
 6 
 16 
 I 
 9 
 
 2 
 H 
 
 9-95 
 
 IO.OO 
 
 10.04 
 10.60 
 
 
 14.90 
 14.90 
 
 15.01 
 
 The last comparison used in deriving the mean light-curve was that of 1905 
 March 12. The curve yields a period of 438 days. Several series of observations, 
 covering the maxima between 1 895 and 1900, have been published in the A stro- 
 nomical Journal, by H. M. Parkhurst, who noted an " intermediate maximum " 
 1896 July 14. Probably for this reason the period which had been given as 
 430 days in Chandler's Third Catalogue, was called 218 days in his "Revised 
 Elements." The present series excludes such intermediate maxima (except 
 that no evidence is furnished for 1901). 
 
 A single observation at Bonn, 1856 July 30, 9.5 magnitude, might refer 
 to this star if a correction of one division of the ocular scale be admitted. If 
 so, the star must have been very near maximum, and calling the epoch -31 the 
 period 436 days results; but as stated above, at present the period is at least 
 438 days. 
 
 Leaving out of account the intermediate maximum in question, the light- 
 curve presents no abnormal features. The total range observed is just about 
 five magnitudes, the different maxima and minima being quite closely accordant, 
 The rise is much faster than the decline, occupying but 35 per cent of the period. 
 
CHAPTER IX. 
 
 7220 S CYGNI. 
 R. A. 2oh 31" 245.7; Dec. + 57 41' 52" (1900). 
 
 This star was discovered at Bonn in 1860 and has been well observed, since 
 Chandler's revised elements depend on 43 maxima and 5 minima, but it does 
 not appear that the minima have ever been completely followed. Townley 
 reports it invisible for two months near minimum in the Madison 1 5-inch, and 
 in the extended series of observations published in Harvard Annals 37 it was 
 invisible for periods ranging from 70 to 99 days. The photometric measures of 
 comparison stars at Harvard extend only to 13.44, an d those by H. M. Parkhurst 
 to 13.48; so that more work was needed in fixing the magnitudes of the fainter 
 comparison stars and following the variable through its minimum. In the Har- 
 vard volume above cited the faintest magnitudes noted before and after minimum 
 range from 13.0 to 14.8, and though opportunities for observation when the 
 variable was faint have been few, about a dozen comparisons have been made 
 when it was below the Harvard limit; and photometric magnitudes have been 
 found for the comparison stars down to the faintest used, thus fixing the mini- 
 mum magnitude of the variable with some precision. 
 
 TABLE 70. 7220 S CYGNI. STANDARD MAGNITUDE STARS. 
 
 Star. 
 
 B. D. No. 
 
 1900. 
 
 Color, 
 P. DM. 
 
 Magnitude. 
 
 Residuals. 
 
 R. A. 
 
 Dec. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nightc 
 inter 
 se. 
 
 H.C.O. 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 B 
 C 
 D 
 
 + 5.7 2106 
 ) 57 2129 
 7 2144 
 
 Mean 
 
 h m s 
 
 19 56 58 
 20 02 32 
 
 20 05 38 
 
 / 
 
 + 57 32-1 
 + 57 19-5 
 + 57 29.5 
 
 W 
 GW 
 
 W 
 
 7.08 
 7.88 
 7.04 
 
 7-47 
 7.96 
 
 7.32 
 
 7-29 
 
 7-53 
 7-17 
 
 7-54 
 
 7.78 
 7.42 
 
 + 21 
 
 -35 
 
 + '3 
 
 + 7 
 -18 
 
 + 10 
 
 4 
 6 
 n 
 
 7-33 
 
 7-58 
 
 7-33 
 
 7.58 
 
 23 
 
 12 
 
 7 
 
 
 
 
 
 TABLE 71. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 1855- 
 
 btar. 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 
 
 
 h m s 
 
 / 
 
 
 c 
 
 
 h m s 
 
 / 
 
 c 
 
 + 57 2124 
 
 8.9 
 
 20 oo 23 
 
 + 57 23.9 
 
 r 
 
 + 57 2137 
 
 9.0 
 
 20 2 44 
 
 + 57 3-3 
 
 d 
 
 + 57 2128 
 
 9.0 
 
 20 I 18 
 
 + 57 36.0 
 
 g 
 
 + 57 2139 
 
 9-5 
 
 20 3 20 
 
 + 57 29.0 
 
 e 
 
 + 57 2130 
 
 9-3 
 
 20 2 4 
 
 + 57 3'-6 
 
 b 
 
 + 57 2149 
 
 8.1 
 
 20 6 2 
 
 + 57 53-6 
 
 ) 
 
 + 57 2135 
 
 8.9 
 
 20 2 29 
 
 + 57 35-1 
 
 
 
 
 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 72. COMPARISON STARS FOR S CYGNI (IN ORDER OF RIGHT ASCENSION). 
 
 Star. 
 
 Coordinates from Variables. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 c 
 
 It 
 
 -990 
 
 -124.4 
 
 624 
 
 39-7 
 
 8.54 
 
 8.79 
 
 
 
 e 
 
 -551 
 
 -68.9 
 
 + 105 
 
 36.9 
 
 9-39 
 
 9-64 
 
 
 
 a* 
 
 -422 
 
 -52.6 
 
 -1342 
 
 
 7-53 
 
 7-78 
 
 
 
 / 
 
 -194 
 
 -24.2 
 
 -152 
 
 32.1 
 
 9.87 
 
 IO. 12 
 
 
 
 a 
 
 109 
 
 -13-4 
 
 + 72 
 
 8-3 
 
 13.90 
 
 H-'S 
 
 
 
 y 
 
 - 74 
 
 - 9-3 
 
 + 52 
 
 16.4 
 
 12.31 
 
 12.56 
 
 
 
 m' 
 
 - 45 
 
 - 5-6 
 
 + 455 
 
 
 
 
 
 
 e 
 
 - 41 
 
 - 5-' 
 
 + 80 
 
 03 
 
 14.94 
 
 15-19 
 
 
 
 i 
 
 - 39 
 
 - 4.4 
 
 4 
 
 -0.5 
 
 15-48 
 
 15-73 
 
 15.66 
 
 15 -9i 
 
 X 
 
 22 
 
 - 2.8 
 
 -165 
 
 19.0 
 
 n 95 
 
 12. 20 
 
 
 
 d 
 
 + 3 
 
 + 0.3 
 
 + 45 
 
 38.0 
 
 8.98 
 
 9-23 
 
 
 
 i 
 
 + 8 
 
 + i.o 
 
 + 59 
 
 4-8 
 
 
 
 14.63 
 
 14.88 
 
 r 
 
 . + 21 
 
 + 2.6 
 
 -114 
 
 4.6 
 
 J4-34 
 
 14-59 
 
 
 
 P 
 
 + 35 
 
 + 4.4 
 
 -170 
 
 21.8 
 
 
 
 11-43 
 
 ii 68 
 
 m 
 
 + 49 
 
 + 6.1 
 
 + 461 
 
 24.1 
 
 10-73 
 
 10.98 
 
 
 
 I' 
 
 + 82 
 
 + 10.3 
 
 - 94 
 
 
 
 
 
 
 o 
 
 + 98 
 
 + 12.3 
 
 + 168 
 
 22. 
 
 11.32 
 
 "57 
 
 
 
 n 
 
 -f IOO 
 
 + 12.5 
 
 + 445 
 
 2 3 .6 
 
 
 
 II . 12 
 
 "-37 
 
 I 
 
 + 105 
 
 + 13-' 
 
 IOO 
 
 25-7 
 
 10.53 
 
 10.78 
 
 
 
 t 
 
 + 105 
 
 + 13-1 
 
 + 45 
 
 10.6 
 
 12. 8 
 
 13-1+- 
 
 13. 5 
 
 13. 7 
 
 T 
 
 + 125 
 
 + 15.6 
 
 -230 
 
 
 8.86 
 
 9.11 
 
 
 
 k 
 
 + 162 
 
 + 20.3 
 
 -347 
 
 28.7 
 
 
 
 IO. 2O 
 
 10.45 
 
 & 
 
 + 400 
 
 + 50.0 
 
 -314 
 
 33-2 
 
 
 
 9-59 
 
 9.84 
 
 *o = c of Table 71. 
 
 TABLE 73. 7220 S CYGNI. PHOTOMETER MEASURES OP COMPARISON STARS. 
 
 1904 September 3. 6-1 NCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 o 
 
 
 
 
 
 
 
 
 21 O 
 
 19 
 
 B 
 
 10.0 9.7 9.8 
 
 9-83 
 
 10. 17 
 
 0.30 
 
 7-23 
 
 7.48 
 
 
 
 C 
 
 12.2 11.7 11.5 
 
 11.80 
 
 I 2. O2 
 
 0.51 
 
 7-44 
 
 7.69 
 
 
 
 c 
 
 20.2 2O. O 20.2 
 
 20. 13 
 
 20 88 
 
 i .69 
 
 8.62 
 
 8.87 
 
 
 
 e 
 
 24.9 25.6 25.3 
 
 25-27 
 
 26.90 
 
 2-39 
 
 9-32 
 
 9-57 
 
 
 
 f 
 
 30.8 29.9 30.3 
 
 30.33 
 
 30.67 
 
 2-77 
 
 9.70 
 
 9-95 
 
 
 
 d 
 
 24.2 24.3 24.4 
 
 24.30 
 
 24.80 
 
 2. 12 
 
 9 05 
 
 9 30 
 
 
 
 T 
 
 24.0 24.5 23.9 
 
 24-13 
 
 25.00 
 
 2.13 
 
 9 05 
 
 9 31 
 
 
 
 D 
 
 11.7 10.8 10.9 
 
 11-13 
 
 11.17 
 
 0.40 
 
 7-33 
 
 7-58 
 
 
 
 D 
 
 II .2 II .2 II .2 
 
 ii .20 
 
 
 
 
 
 
 
 T 
 
 26.2 25.3 26.1 
 
 25-87 
 
 
 
 
 
 
 
 d 
 
 25-3 25-4 25-2 
 
 25 30 
 
 
 
 
 
 
 
 i 
 
 31.0 31.0 31.0 
 
 31 -00 
 
 
 
 
 
 
 
 e 
 
 28.7 28.3 28.6 
 
 28.53 
 
 
 
 
 
 
 
 c 
 
 22. I 21.8 21.0 
 
 21.63 
 
 
 
 
 
 
 
 C 
 
 12.7 12.5 11.5 
 
 12.23 
 
 
 
 
 
 21 21 
 
 21 
 
 B 
 
 10.0 10.8 10.7 10.50 
 
 
 
 
 .... 
 
STELLAR PHOTOMETRY. 
 4-jm 
 
 N 
 
 PLATE 9. 
 
 +20' 
 
 I 
 
 - ', 
 
 . . 
 
 . t 
 
 * 
 
 + 10 
 
 
 . . , 
 
 n fffl 
 
 a 
 
 *.y 
 
 (f)S 
 
 . Vv .y 
 
 
 
 T 
 
 o' 
 
 
 
 Scale, i mm= 13." 3. 
 
 1902 November 
 
 7220 S CYGNI. 
 R. A. 2oh 3" 248.7. Dec. +57 41' 52", 1900. 
 
CHAPTER IX. S CYGNI. 
 
 119 
 
 TABLB 73. 7220 S CYGNI PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1904 September 5. 6-INCH. Good, somewhat dull. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 ig 30 
 
 O 
 
 i? 
 16 
 
 Da, 
 
 r 
 
 4 
 
 I 
 e 
 c 
 C 
 B 
 B 
 C 
 c 
 e 
 
 l d 
 
 13.8 14.3 14.9 
 23.2 23.0 22.0 
 24.0 23.0 23.5 
 31 .1 30.8 30.8 
 26.0 26.6 26.9 
 
 20.0 19.9 2O.4 
 13.2 12.5 13.3 
 IO.3 IO.7 1O.2 
 
 ii . i 10. i 10.8 
 '3-3 '3-2 12. S 
 
 2O. 7 21.5 21.2 
 24.9 25.3 25.0 
 31.4 31.9 31.8 
 24.9 25.0 25.0 
 
 14-33 
 22-73 
 23 50 
 30.90 
 26.50 
 20. 10 
 13.00 
 10.40 
 10.67 
 13.10 
 21.13 
 25.07 
 3.7o 
 24 97 
 
 
 0.87 
 
 2.OO 
 2.06 
 2.84 
 2.22 
 1.66 
 0.65 
 0.34 
 
 7-83 
 8.96 
 9.02 
 9.80 
 ' 9. 18 
 8.62 . 
 7.61 
 7-30 
 
 8.08 
 9.21 
 9.27 
 10.05 
 
 9-43 
 8.87 
 7.86 
 7-55 
 
 
 24.24 
 3L30 
 25 79 
 20.62 
 13 05 
 io 54 
 
 1904 October I. Good. 
 
 21 33 
 21 53 
 
 21 
 24 
 
 D 
 T 
 d 
 
 } 
 e 
 c 
 C 
 B 
 B 
 C 
 c 
 e 
 
 d 
 T 
 D 
 
 8.8 9.7 9.2 
 23.9 23.9 24.8 
 25. i 26.2 25.8 
 
 32 9 32.9 32.9 
 26.8 27.7 27. i 
 
 21.6 21 . I 21.2 
 12.9 13.2 13.2 
 II. O II.5 II. I 
 
 n .8 11.7 11.7 
 
 13-7 '3-4 13 
 2O. O 19.8 21 .0 
 27.9 27.8 27.6 
 31.3 32.2 31.9 
 24.3 24.9 24.2 
 22.8 23.1 23.6 
 9.8 9.3 9.2 
 
 9-23 
 
 24.20 
 25.70 
 32.90 
 27.20 
 21.30 
 13. 10 
 ii .20 
 i' -73 
 13-37 
 20.27 
 
 27-77 
 31.80 
 
 24-47 
 23-7 
 9-43 
 
 9-33 
 23.69 
 25.09 
 32.35 
 27-49 
 20.79 
 
 13-24 
 11.47 
 
 O. 22 
 2.OI 
 2.14 
 2. 9 8 
 2.40 
 
 1.68 
 0.67 
 0-45 
 
 7.10 
 
 8.89 
 9.02 
 9.86 
 9.28 
 8.56 
 7-55 
 7-33 
 
 7-35 
 9.14 
 9.27 
 
 IO. II 
 
 9-53 
 8.81 
 7.80 
 7-58 
 
 1904 August 13. 12-INCH. Good. 
 
 17 48 
 18 14 
 
 26 
 22 
 
 c 
 e 
 t 
 
 X 
 
 T 
 I 
 
 V 
 
 d 
 o 
 m 
 m 
 o 
 d 
 I 
 T 
 
 X 
 
 } 
 e 
 c 
 
 17.2 17.5 16.8 
 25-5 26.3 26.4 
 32.0 31.7 31.8 
 53-5 54-6 54.2 
 24.2 23.0 22.5 
 38.2 39.0 38.6 
 39.7 40.6 39.7 
 22.5 23.9 23. i 
 43.8 44.7 45.0 
 40.7 41.5 41.0 
 40.9 41.1 40.7 
 45.2 46.6 45.7 
 23.4 23.1 21.9 
 36.7 37-5 37-8 
 
 22. O 22. I 2O.3 
 
 53 5 55-o 53-9 
 32.0 32.6 31.8 
 27.9 28.2 28. i 
 18.6 18.2 17.2 
 
 17.17 
 26.07 
 31-83 
 54-io 
 23.23 
 38.60 
 40.00 
 23-17 
 44-50 
 41.07 
 40.90 
 45-82 
 22.80 
 37-33 
 21-47 
 54 3 
 32-13 
 28.07 
 18.00 
 
 17-59 
 27.07 
 31-98 
 54-12 
 22.35 
 
 37-97 
 
 1.41 
 
 2-37 
 2.85 
 5.16 
 1.96 
 3-55 
 3-78 
 
 2. O2 
 
 4-35 
 3-88 
 
 8.42 
 9-38 
 9.86 
 12.17 
 
 8.97 
 10.56 
 10.79 
 9-03 
 11.36 
 10.89 
 
 8.67 
 9.63 
 
 IO. II 
 
 12.42 
 9.22 
 10.81 
 11.04 
 9.28 
 ii .61 
 ii . 14 
 
 22.99 
 
 45-17 
 40.99 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
120 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 73. 7220 S CYGNI. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1904 October 28. 12-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 k m 
 
 22 8 
 22 30 
 
 O 
 
 24 
 27 
 
 m 
 
 
 
 d 
 I 
 T 
 
 X 
 
 } 
 e 
 c 
 c 
 e 
 t 
 
 X 
 
 T 
 I 
 d 
 
 
 
 m 
 
 30.3 30 9 30.8 
 36.5 37.1 36.3 
 12.9 14.1 13.3 
 29.6 29.7 29. i 
 12.4 12.7 13.0 
 41.7 41.4 41.6 
 
 21.3 22. 7 21.8 
 
 17.8 18.3 19.0 
 12.5 ii .8 12. o 
 
 II.5 II.4 12. O 
 
 18.0 18.3 18.2 
 
 23. I 22.8 23.3 
 
 41.2 41.5 42.1 
 14.0 14.2 13.7 
 30.3 29.4 29.1 
 14.7 15.3 15.2 
 36.5 37.2 36.9 
 31.8 31.7 30.9 
 
 30.67 
 36.63 
 13 43 
 29 47 
 12.70 
 
 4J.57 
 21.93 
 
 18.37 
 
 12. IO 
 11.63 
 
 18. 17 
 
 23.07 
 
 41 .60 
 
 13.97 
 
 29.60 
 
 15.07 
 
 36 87 
 
 3i 47 
 
 31-07 
 36.75 
 14-25 
 29-54 
 13-34 
 41-59 
 22.50 
 18.27 
 11.87 
 
 2.76 
 3 40 
 0-95 
 2.61 
 0.83 
 3 95 
 1-97 
 1.49 
 0.64 
 
 10.71 
 
 "35 
 8.90 
 10.56 
 8.78 
 ii .90 
 9.92 
 9-44 
 8-59 
 
 10.96 
 ii .60 
 
 9 '5 
 10.81 
 9 03 
 12. 15 
 10. 17 
 
 9.69 
 8.84 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 October 31. Good, dull 
 
 o 14 
 o 37 
 
 40 
 43 
 
 m 
 
 
 
 d 
 I 
 T 
 
 X 
 
 f 
 e 
 c 
 c 
 e 
 
 i 
 
 X 
 
 T 
 I 
 d 
 
 
 
 m 
 
 29.0 28.9 28.8 
 
 35.2 34.2 34.7 
 
 14.8 14. I 14.0 
 26.1 27.8 26.9 
 12.2 12. O 12. I 
 
 39 3 38-8 39.1 
 20 . o 20 . 3 20 . o 
 16. i 16.2 16.8 
 10.9 11.7 10.3 
 10.7 10.8 10.2 
 16.9 16.7 17.3 
 
 21 . I 20.3 2O. 2 
 
 39 6 39.4 38.9 
 
 12.2 13.7 13.0 
 27.5 27.4 27.8 
 14.9 13.9 12.9 
 
 35-5 35.0 34.3 
 28.0 28.6 28.1 
 
 28.90 
 34-70 
 
 14.3 
 26.60 
 
 12. IO 
 39-07 
 2O. IO 
 
 16.37 
 10.97 
 
 10-57 
 16.97 
 20.53 
 39.30 
 12.97 
 
 27-57 
 13.90 
 
 34-93 
 28.23 
 
 28.57 
 34-82 
 14. 10 
 27.09 
 12-54 
 39-19 
 20.32 
 16.67 
 10.77 
 
 2.52 
 3-'7 
 0-94 
 2.38 
 0-75 
 3 69 
 
 1-74 
 1.28 
 
 0.53 
 
 10.60 
 11.25 
 9.02 
 10.46 
 8.83 
 11.77 
 9.82 
 9-36 
 8.61 
 
 10.85 
 II 50 
 9.27 
 
 10.71 
 9.08 
 
 I 2. O2 
 IO.O7 
 9.61 
 
 8.86 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1000 August 30. 40-INCH WEDGE II. Low, seeing poor. 
 
 i 40 
 
 2 2O 
 
 
 y 
 
 a 
 X 
 
 
 m 
 
 30.5 32 8 31.6 
 46.5 50.5 48.3 
 26.8 25.2 27. i 
 
 22.8 23.7 26.5 
 
 18.0 20.7 18.4 
 
 31-63 
 4 8 -43 
 26.37 
 
 24.33 
 19.03 
 
 
 3-05 
 4.84 
 
 2.43 
 2.16 
 
 i 35 
 
 12.40 
 14.19 
 11.77 
 
 11-51 
 10.70 
 
 12.65 
 14.44 
 12.03 
 ii .76 
 10.95 
 
 
 
 
 
CHAPTER IX. S CYGNI. 
 
 121 
 
 TABLE 73. 7220 S CYGNI. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1900 September 13. W-INCH, WEDGE n Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Wean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 21 27 
 22 6 
 
 
 
 m 
 o 
 
 a 
 
 y 
 
 v 
 
 / 
 
 X 
 X 
 
 / 
 y 
 
 a 
 O 
 
 m 
 
 15.7 17.0 14.9 
 
 22.3 21.9 22 .4 
 42.6 42.8 43.0 
 30.9 31.0 31.8 
 38.5 38.0 40.0 
 15.8 14.0 14.2 
 26. I 24.2 25.2 
 26.5 25.2 27.2 
 15. I 13.2 13.0 
 28.2 31.8 30.9 
 42.5 41.9 43.0 
 
 21.9 20 . 5 21.4 
 
 16.9 15.5 15.3 
 
 15-87 
 
 22.20 
 42 . 80 
 3I-23 
 38.83 
 14.67 
 
 25-I7 
 26.30 
 
 13-77 
 30.30 
 
 42.47 
 21 .27 
 
 15-90 
 
 15 89 
 21.74 
 42.64 
 30 77 
 
 0.82 
 
 i-77 
 4-23 
 2-94 
 3.80 
 
 0.59 
 2-33 
 
 10.48 
 
 "43 
 13 89 
 12.60 
 13-46 
 10.25 
 11.99 
 
 10-73 
 11.68 
 14.14 
 
 12.85 
 
 13 7i 
 10.50 
 
 12 24 
 
 14.22 
 25-74 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1902 November 3. WEDGE v. Poor, occasionally fair for a moment. 
 
 o 55 
 
 
 n 
 m 
 
 t 
 
 a. 
 
 y 
 
 V 
 X 
 
 / 
 I 
 
 X 
 
 V 
 
 y 
 
 a 
 
 t 
 
 o 
 m 
 n 
 
 31.8 32.9 33.6 
 28.7 29.6 3O.2 
 38.4 38.5 38.0 
 
 49 5 49-3 50.0 
 58.6 59.8 59.4 
 41.3 41.8 42.3 
 18.4 19.0 19.2 
 38 . 2 40 . 3 40 . i 
 25.3 26.1 25.7 
 26.3 26.9 26.3 
 39 o 38.5 39.2 
 18.6 19.0 19.8 
 39.8 40.2 39.8 
 56.8 59.8 59.7 
 48.4 50.8 49.9 
 36.2 35.8 36.3 
 28.2 30.2 28.4 
 36.9 36.2 36.2 
 
 32.77 
 29.50 
 38.30 
 49.60 
 
 59-27 
 41.80 
 
 18.87 
 
 39-53 
 25 70 
 26.50 
 38.90 
 19 13 
 39-93 
 58-77 
 49.70 
 36.10 
 28.93 
 36.43 
 
 34.60 
 29.22 
 37.20 
 49 65 
 59 .02 
 40.87 
 19.00 
 
 39-22 
 
 26. 10 
 
 3-iS 
 2-57 
 3-45 
 4-77 
 5-45 
 3.86 
 
 i 59 
 3-69 
 2.30 
 
 it .24 
 10.66 
 
 " 54 
 12.86 
 
 13 54 
 "-95 
 9.68 
 11.78 
 10.39 
 
 11.49 
 10.91 
 11.79 
 I3-" 
 13-79 
 12.20 
 
 9-93 
 12.03 
 10.64 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 January 3. Good. 
 
 i 35 
 
 i 54 
 
 54 
 
 m 
 
 
 a 
 
 9 
 t 
 
 v 
 
 Y 
 X 
 X 
 
 y 
 
 v 
 e 
 
 y 
 
 a 
 O 
 
 14.8 15.8 15.3 
 
 21 .4 22.4 22.4 
 
 45-6 47.2 47.7 
 32.9 31.7 30.7 
 57-i 57-7 58-0 
 58.1 58.4 58.0 
 51.3 49.1 50.7 
 24.2 25.1 25.3 
 27.0 26.0 26. 7 
 49.0 50.4 50.2 
 58.5 59-8 58.4 
 59-3 59-3 59-o 
 28.4 30.1 29.3 
 45.0 46.2 46.0 
 23.1 23.7 24.0 
 15.0 16.7 16.5 
 
 15-30 
 22.07 
 46.50 
 
 31-77 
 57.60 
 58.17 
 5-37 
 24-87 
 26.57 
 49.87 
 58.90 
 59-20 
 29.27 
 
 45-73 
 23.60 
 16.07 
 
 15.68 
 
 22.84 
 
 46. 12 
 30.52 
 58.40 
 
 58.54 
 50.12 
 
 25-72 
 
 I-I5 
 
 2.01 
 
 4-45 
 2.76 
 5-42 
 5-43 
 4.82 
 2.27 
 
 10.67 
 11-53 
 '3-97 
 12.28 
 14.94 
 '4-95 
 '4-34 
 11.79 
 
 10.92 
 11.78 
 14.22 
 12-53 
 I5-I9 
 15.20 
 
 14 59 
 12.04 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
122 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 73. 7220 S CYGNI. PHOTOMETBR MEASURES OF COMPARISON STARS. Continued. 
 
 1905 November 18. 40-INCH, WEDGE V. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h in 
 
 
 
 
 
 
 
 
 
 6 30 
 
 
 X 
 
 19.3 20. i 20. o 
 
 19.80 
 
 19 25 
 
 1.62 
 
 ii 95 
 
 12 . 2O 
 
 
 
 V 
 
 42.0 42.8 44.2 
 
 43.00 
 
 42 . 10 
 
 4.01 
 
 14.34 
 
 14-59 
 
 
 
 S 
 
 54-i 56.6 53.1 
 
 54.60 
 
 54.04 
 
 5 15 
 
 15-48 
 
 15.73 
 
 
 
 V 
 
 21 .0 20. 7 20. 7 
 
 20.80 
 
 20.86 
 
 i .80 
 
 12.13 
 
 12.38 
 
 
 
 a 
 
 40 . 5 40 . i 40 . i 
 
 40.43 
 
 39.76 
 
 3 75 
 
 14.08 
 
 14-33 
 
 
 
 O 
 
 15 5 '5-9 15 8 
 
 15.73 
 
 15-36 
 
 !.I6 
 
 " 49 
 
 II .74 
 
 
 
 t 
 
 33 -6 32.1 32 .8 
 
 32.83 
 
 32-46 
 
 2.90 
 
 13-23 
 
 I3.48 
 
 
 
 t 
 
 32 I "?2 O ^2 2 
 
 32 IO 
 
 
 
 
 
 
 
 
 
 14 o 15.7 15.3 
 
 I S OO 
 
 
 
 
 
 
 
 
 l6 8 41 3 3O.8 
 
 
 
 
 
 
 
 
 v 
 
 20 8 20.9 21 i 
 
 2O Q3 
 
 
 
 
 
 
 
 1 
 
 52. i 53. 7 V4..6 
 
 c-i 47 
 
 
 
 
 
 
 
 Y 
 
 
 
 
 
 
 
 6 50 
 
 
 X 
 
 18.7 18.3 19.1 
 
 18.70 
 
 
 
 
 
 
 
 
 
 TABLE 74. 7220 S CYGNI. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 1904 September 3. 
 
 1904 September 5. 
 
 1904 October i. 
 
 C. 
 
 Obs. Mag. 
 
 JMag. 
 
 C. 
 
 Obs. 
 
 Mag. 
 
 J Mag. 
 
 C. 
 
 Obs. Mag. 
 
 4 Mag. 
 
 H. 
 
 P. 
 
 H. P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 B 
 C 
 D 
 
 Means 
 
 Mo... 
 
 0.30 
 0.51 
 0.40 
 
 7-23 
 7-44 
 7-33 
 
 7.48 
 7.69 
 7.58 
 
 + .15 + .01 
 
 - .44 - .27 
 + .29 + .26 
 
 0-34 
 0.65 
 
 O. 12 
 
 7-30 
 7.61 
 7.08 
 
 7-55 
 7.86 
 
 7-33 
 
 + .22 
 
 -27 
 + .04 
 
 + .08 
 . 10 
 
 + . 01 
 
 0-45 
 0.67 
 
 O.22 
 
 7-33 
 7-55 
 7.10 
 
 7.58 
 7.80 
 7-35 
 
 + 25 
 -33 
 4- .06 
 
 + .11 
 - .16 
 + -03 
 
 0.40 
 
 7-33 
 6-93 
 
 7.58 
 7.18 
 
 .29 .18 
 
 o.37 
 
 7-33 
 6.96 
 
 7.58 
 
 7-21 
 
 .18 
 
 .06 
 
 0-45 
 
 7-33 
 6.88 
 
 7-58 
 7-13 
 
 .2I 
 
 .IO 
 
 12-INCH. 
 
 40-INCH 
 
 Star. 
 
 Mag. 
 6-inch. 
 
 c. 
 
 Star. 
 
 Mag. 
 12-inch. 
 
 C. 
 
 Aug. 13. 
 
 Oct. 28. 
 
 Oct. 31. 
 
 Nov. 3. 
 
 Jan.3. 
 
 Aug. 30. 
 
 Sept. 13. 
 
 c 
 
 8.60 
 9 03 
 9.26 
 
 9-79 
 8.97 
 
 1-41 
 
 2. O2 
 
 2-37 
 2.8 5 
 I .96 
 
 0.64 
 
 0-95 
 1.49 
 
 1-97 
 0.83 
 
 o.53 
 0.94 
 1.28 
 i-74 
 0-75 
 
 i 
 
 . n 
 
 
 
 X 
 
 ft 
 M 
 
 > 
 
 
 10-53 
 10-73 
 11.32 
 "95 
 
 
 
 
 
 o 59 
 0.82 
 
 1-77 
 2-33 
 
 d 
 
 
 2-57 
 3-45 
 3-69 
 
 i.i5 
 
 2.OI 
 
 2.27 
 
 1-35 
 2.16 
 
 2 43 
 
 e 
 
 
 / 
 
 
 T 
 
 can C 
 eanM 
 
 ' 
 
 
 Mean C . . . 
 
 
 2. 12 
 
 9-13 
 
 7.01 
 
 i.iB 
 
 9-13 
 7-95 
 
 1.05 
 
 9-13 
 8.08 
 
 
 3-24 
 "33 
 8.09 
 
 I. 8l 
 
 11-33 
 9-52 
 
 1.98 
 ii 33 
 9 35 
 
 i-47 
 11-13 
 9.66 
 
 Mean Mag. 
 M . 
 
 9 '3 
 
 ag. 
 
 ii 
 
 13 
 
 
 
 
 
CHAPTER IX. S CYGNI. 
 
 123 
 
 16 IS I* 13 
 
 MAGNITUDE 
 if II 
 
 7ZZO S CYGNI 
 
 20 
 fe 
 
 FIG. 25. MAGNITUDE-CURVE FOR S CYGNI. 
 
124 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 75. 7220 S CYGNI. MBAN MAGNITUDES OF COMPARISON STARS. 
 
 6-INCH. 
 
 Star. 
 
 September 3. 
 
 September 5. 
 
 October 
 
 i. 
 
 Mean. 
 
 Mag. 
 
 JMag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 J 
 
 Mag. 
 
 Mag. H 
 
 Mag. P 
 
 A Mag. 
 
 B 
 C 
 D 
 
 c 
 d 
 e 
 
 T 
 
 7-23 
 7-44 
 7-33 
 
 Mean . 
 
 8.62 
 9-05 
 9-32 
 9.70 
 9.06 
 
 Mean . 
 
 0.06 
 0.09 
 
 + 0.16 
 
 7-30 
 7.61 
 7.08 
 
 + O.OI 
 
 + 0.08 
 0.09 
 
 7-33 
 7-55 
 7.10 
 
 + 0.04 
 
 + O.02 
 O.O7 
 
 7.29 
 7-53 
 7-"7 
 
 7-54 
 7-78 
 7.42 
 
 0.04 
 0.06 
 
 0. II 
 
 7-33 
 
 7-58 
 
 0.07 
 
 + O.O2 
 + O.O2 
 + O.O6 
 O.O9 
 + 0.09 
 
 8.62 
 9.02 
 9.18 
 9.80 
 8.96 
 
 + O.O2 
 O.OI 
 -0.08 
 + O.OI 
 O.OI 
 
 8.56 
 9.02 
 9.28 
 9.86 
 8.89 
 
 0.04 
 O.OI 
 + O.O2 
 + O.O7 
 -0.08 
 
 8.60 
 
 9-03 
 9.26 
 
 9-79 
 8.97 
 
 8.85 
 9.28 
 9-51 
 10.04 
 9.22 
 
 0.03 
 0.01 
 0.05 
 0.06 
 0.06 
 
 
 
 9.13 
 
 9.38 
 
 0.04 
 
 
 
 
 
 
 12-INCH. 
 
 Star. 
 
 August 13. 
 
 October 28. 
 
 October 31. 
 
 Mean. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 JMag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 d Mag. 
 
 c 
 d 
 e 
 
 T 
 
 I 
 m 
 o 
 x 
 
 8.42 
 9-03 
 9-38 
 9.86 
 8.97 
 
 Mean . 
 
 10.56 
 10.89 
 11.36 
 
 12. 17 
 
 Mean . 
 
 O. 12 
 + 0.05 
 O.OI 
 O.OI 
 + O. II 
 
 8-59 
 8.90 
 
 9-44 
 9.92 
 
 8.78 
 
 + 0.05 
 -0.08 
 + 0.05 
 + 0.05 
 -0.08 
 
 8.61 
 9.02 
 9-36 
 9.82 
 8.83 
 
 + 0.07 
 + 0.04 
 -0.03 
 0.05 
 -0.03 
 
 8.54 
 8.98 
 
 9-39 
 9.87 
 8.86 
 
 8.79 
 
 9-23 
 9.64 
 
 IO. 12 
 9.II 
 
 0.08 
 0.06 
 0.03 
 0.04 
 0.07 
 
 
 
 9.13 
 
 9-38 
 
 0.06 
 
 +0.03 
 + 0.16 
 + 0.04 
 
 + O.22 
 
 10.56 
 10.71 
 
 "35 
 ii .90 
 
 +0.03 
 
 O.O2 
 
 +0.03 
 0.05 
 
 10.46 
 10.60 
 11.25 
 "77 
 
 
 
 0.07 
 -0.13 
 0.07 
 0.18 
 
 !0.73 
 ".32 
 "95 
 
 10.78 
 10.98 
 
 "57 
 
 1 2. 2O 
 
 0.04 
 
 O. 10 
 
 0.05 
 0.15 
 
 
 
 11.13 
 
 "38 
 
 0.08 
 
 
 
 
 
 
 40-INCH. 
 
 ^ August 30. 
 
 September 13. November 3 
 
 January 3. 
 
 Mean. 
 
 w Mag. 
 
 J Mag. 
 
 Mag. 
 
 ^ Mag. Mag. 
 
 J Mag.> Mag. 
 
 JMag 
 
 . Mag. H 
 
 . Mag. P. 
 
 A Mag. 
 
 I . 
 
 
 
 10.25 
 
 10.48 
 
 "43 
 11.99 
 
 0.07 10.39 
 0.15 10.66 
 -0.07 11.54 
 4-o.i6 11.78 
 
 + 0.07 
 + 0.03 
 + 0.04 
 -0.05 
 
 
 
 10.32 
 
 ^ 10.63 
 
 3 i i . 50 
 
 ^ "-83 
 
 10.57 
 10.88 
 
 "75 
 12.08 
 
 0.07 
 0.07 
 0.04 
 0.08 
 
 m 10.70 
 o 11.51 
 x "-77 
 
 Mean. 
 
 + 0.07 
 
 + O.OI 
 
 0.06 
 
 10.67 
 
 "53 
 11.79 
 
 + O.O 
 
 + 0.0 
 
 o.o 
 
 11.07 
 
 11.32 
 
 0.06 
 
 y 12.40 
 a 14.19 
 
 t 
 
 + 0.09 
 + 0.29 
 
 12.60 
 13.89 
 
 + 0.29 11.95 
 o.oi 13.54 
 .... 1 2 86 
 
 -0.36 
 -0.36 
 
 12.28 
 13.97 
 
 -0.0 
 + 0.0 
 
 3 12.31 
 
 i 13-90 
 (12.86 
 (14.94 
 (14.34 
 
 12.56 
 H-I5 
 13 " 
 15-19 
 14-59 
 
 0.19 
 0.18 
 
 
 
 
 
 
 
 
 
 r 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Also 3, 1905 November 18, 15.48 and 15.73. 
 
CHAPTER IX. 
 
 CYGNI. 
 
 125 
 
 TABLE 76. 7220 S CYGNI. VISUAL OBSERVATIONS OP THE VARIABLE. 
 
 No. 
 
 Date. 
 
 h 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 I. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 i 
 
 2 
 
 3 
 4 
 
 5 
 
 6 
 
 7 
 8 
 
 9 
 
 IO 
 
 1 1 
 
 12 
 13 
 
 '4 
 15 
 
 16 
 
 18 
 
 '9 
 20 
 
 21 
 22 
 23 
 24 
 25 
 26 
 
 27 
 28 
 
 29 
 30 
 
 3' 
 32 
 33 
 34 
 35 
 36 
 37 
 38 
 39 
 40 
 4 
 42 
 43 
 
 1892 
 Dec. 14 
 
 1893 
 Jan. 7 
 July 2 
 3 
 
 Aug. 3 
 
 ii 
 
 17 
 Sept. 4 
 6 
 
 13 
 26 
 Oct. 4 
 
 IO 
 
 21 
 29 
 
 Nov. 3 
 6 
 
 9 
 
 H 
 
 16 
 20 
 
 25 
 29 
 Dec. i 
 3 
 5 
 8 
 
 12 
 
 17 
 28 
 
 1894 
 
 Jan. 10 
 June 6 
 20 
 
 24 
 28 
 July 2 
 8 
 23 
 29 
 Aug. 6 
 8 
 18 
 20 
 
 9 
 
 7 
 :o 
 
 10 
 
 9 
 9 
 
 10 
 
 8 
 
 9 
 
 8 
 8 
 8 
 
 8 
 
 7 
 6 
 
 7 
 8 
 
 6 
 
 8 
 
 7 
 7 
 6 
 6 
 8 
 
 7 
 6 
 6 
 6 
 
 7 
 7 
 
 7 
 
 10 
 10 
 IO 
 IO 
 IO 
 
 9 
 
 IO 
 
 9 
 9 
 9 
 9 
 9 
 
 2410000+ 
 
 2471-52 
 
 2647.67 
 2648.67 
 
 2679.63 
 
 2683.61 
 2689.66 
 2711.58 
 2713.60 
 2720.58 
 2733-58 
 2741.56 
 
 2737-56^ 
 
 2758-52 
 2766.50 
 
 2771-51 
 2774.60 
 
 r 
 i 
 
 2777-52 < 
 
 I 
 2782.56 
 2784.54 
 2788.54 
 2793-50 
 2797 5' 
 2799 58 
 2801.54 
 2803.51 
 2806 . 50 
 2810.49 
 2815.55 
 2826.54 
 
 2839.52 
 2986.67 
 3000.67 
 3004 67 
 3008.67 
 3012.67 
 3018.63 
 3033-67 
 3039-63 
 3047-63 
 3049.63 
 
 3059-63 
 3061.63 
 
 60 
 
 150 
 150 
 150 
 150 
 150 
 40 
 
 40 
 
 150 
 
 40 
 150 
 150 
 150 
 
 40 
 150 
 
 IO 
 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 
 150 
 150 
 150 
 150 
 150 
 150 
 
 150 
 
 150 
 150 
 150 
 '50 
 
 6 
 
 6 
 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 
 
 
 9-5 
 
 1 1. 06 
 >"-5 
 
 <n-5 
 
 ii .92 
 
 11.89 
 11.80 
 11-52 
 11.27 
 
 10.63 
 
 10.03 
 10. 14 
 10.23 
 10.19 
 
 10. 19 
 
 10.40 
 
 10.30 
 10.46 
 10.60 
 
 10.70 
 10.65 
 10.66 
 10.88 
 11.08 
 
 II. IO 
 
 11.27 
 ii 95 
 
 <I2.0 
 <I2.0 
 <I2.3 
 12.38 
 12.48 
 <I2.3 
 
 12.35 
 
 12.46 
 
 12. IO 
 II 51 
 
 11.13 
 II .05 
 
 poor 
 good 
 
 o 
 
 24 
 200 
 
 2OI 
 
 -0.74 
 +0.31 
 
 fm4i>, 2J2/, limit p ^ 
 
 
 23-9 
 
 <22 
 
 <22 
 
 <22 
 
 <22 
 <2O 
 19.2 
 19.4 
 19.9 
 21-3 
 23-8 
 
 26.7 
 
 30-4 
 29.8 
 29.1 
 29-4 
 
 29-4 
 
 | 28.2 
 28.8 
 
 27-7 
 26.8 
 26.2 
 26.5 
 26.4 
 25-2 
 23-9 
 23-8 
 22.8 
 19.0 
 
 16.5 
 16.0 
 <i7.o 
 16.7 
 16.2 
 18.2 
 21.3 
 
 20.8 
 
 23 6 
 24.1 
 
 \nirn, dse, erf, gif, j^h. .) 
 
 21 . i, 27.7 
 
 i> not seen /> easy 
 
 
 - iinot seen, 036, 62c,cid,d2e > 
 (.120, p not seen, mandm=/) 
 
 
 
 ^ not seen, />easy, <? glimpsed 
 
 
 
 
 
 IO 1. IO O. . 
 
 fair 
 
 fine 
 
 good 
 good 
 good 
 fine 
 
 fair 
 
 fair 
 
 moon 
 moon 
 fair 
 good 
 poor 
 fine 
 fine 
 good 
 good 
 good 
 fair 
 
 fair 
 good 
 fine 
 good 
 good 
 good 
 good 
 fair 
 good 
 good 
 fair 
 fair 
 fair 
 
 264 
 266 
 
 273 
 286 
 
 294 
 300 
 
 3H 
 319 
 324 
 O 
 
 3 
 8 
 
 IO 
 
 14 
 19 
 23 
 25 
 27 
 29 
 32 
 36 
 
 52 
 
 230 
 
 234 
 
 244 
 259 
 265 
 273 
 275 
 285 
 287. 
 
 +0.19 
 + 0.19 
 + 0.28 
 + 0.36 
 + 0.31 
 
 O.O2 
 
 -0.28 
 -0.08 
 + O.OI 
 
 -0.05 
 0.09 
 
 +0.07 
 
 -0.07 
 o.oo 
 o.oo 
 
 O.O2 
 -0.15 
 O.2I 
 0.05 
 + 0.03 
 
 o. 19 
 
 -0.25 
 
 o. 14 
 
 o. 19 
 +0.03 
 
 4-0.18 
 +0.63 
 +0.39 
 
 O.O2 
 
 4-o. ii 
 
 0.12 
 4-0.14 
 
 21*, m; 
 
 p2V, TllX 
 Tip, OIV, T12X 
 
 vjp, Im, hp, o not seen. . .. 
 ( g2/ /3/i hk ^1 
 
 19.8, 19.0 
 19.8, 20. o 
 
 21.8, 21 .O, 21.0 
 22.8, 24.7 
 
 26. 2, 27.7, 26. I 
 3O. I, 3O.6 
 
 "1046, by, C2d, d2e,e^f,eig 
 (n2o, pn, p4~5q, limit q. . r 
 - /3&, hik, k2l, l2m, myi. . 
 (vl, or vil, kiv, ii2m .... j 
 
 i ' V2 fo 
 
 29. I, 3O.6 
 
 
 27 6, 30.6 
 
 (046, bic, C2d,d2e, e\],g\\, ~\ 
 - J4h, hik, hk, kym, m2n, 
 (20, oip, limit p 
 
 28.1, 30.6 
 29.1, 29.6, 30.7,28.2 
 
 28.6, 28.7, 29. I, 27.2 
 29.1, 27.6, 28.7, 26.7 
 28. I, 29.6, 29.7, 27.7 
 
 26 7, 28 7 27 6 
 
 (poor pio, O2q, limit q, r } 
 -. not seen 
 
 (.jyo, Vlh, V2k,V2~3l 
 
 036, b2c,cid, dje, limit e.J 
 \nh or ilk, }yv, iii2l . . 
 
 \fyv, km, ilk, ml 
 
 f^V Vlfl Tllk, V2l 
 
 
 
 25.7, 27. 7, 26.6, 27.1 
 25. 7, 26.7, 26. i, 26. i 
 25.7, 27.7, 26.1 
 25.2, 27.7, 26.6, 26. i 
 
 24. 2, 26 I .. 
 
 Vl k2V h2yV V2m 
 
 vl, kiv, V2m 
 lo-iv, km, h2v, i>2m 
 
 liv, mm, 1130, limit 1-2 < q 
 l2yv mm V3o 
 
 23-7, 23.1, 25.0. . . . 
 23 . 2, 23 . I, 25 .O .... 
 
 13411, mi 2v, vi 20 
 
 22.2, 22.6, 23.5 
 
 
 
 
 
 11 not seen limit x 
 
 
 11 not seen limit 2 <C x 
 
 
 
 
 
 
 v not held, limit 2 < x, X2y 
 X2ii, vy, uncertain 
 xiv, yiv, limit v 
 xo-m, m-2y 
 
 l$V, V2X 
 
 hv, vi-20 
 
 
 I7.O, 16.4 
 17-0, 15-4 
 18.5, 17.9 
 21.2, 21.5 
 
 20. 7, 21 .0 . . . 
 
 23-7, 23.5 
 21.7. 24. S. . 
 
 
 
126 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 76. 7220 S CYGNI. VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 
 
 V 
 
 3 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 (, 
 
 A Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day, 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 44 
 45 
 46 
 
 47 
 48 
 
 49 
 50 
 5i 
 
 52 
 
 53 
 
 54 
 55 
 56 
 
 57 
 58 
 
 59 
 60 
 61 
 62 
 
 63 
 64 
 65 
 
 66 
 
 6? 
 68 
 69 
 70 
 7i 
 72 
 73 
 74 
 75 
 
 76 
 
 77 
 78 
 
 79 
 
 80 
 81 
 82 
 83 
 84 
 
 1895 
 June (. 
 
 13 
 20 
 
 1898 
 June 25 
 July 6 
 
 25 
 Aug. 8 
 20 
 
 1900 
 June 28 
 
 July 20 
 Aug. 1 6 
 29 
 3o 
 Sept. 12 
 
 12 
 
 13 
 13 
 Oct. 4 
 
 9 
 9 
 9 
 
 ii 
 
 10 
 
 ii 
 
 IO 
 
 9 
 
 12 
 IO 
 
 f 
 
 
 [- 
 
 IO 
 
 6 
 6 
 
 16 
 
 10 
 
 2410000 + 
 
 3349-63 
 3358.63 
 
 3365-63 
 
 4466.71 
 4477.67 
 
 1496. 7 i 
 
 4510.67 
 4522.63 
 
 5199 
 
 5221.75 
 5248.67 
 5261 
 5262 
 
 5275 
 5276.67 
 5297-67 
 5309-67 
 
 5319-50 
 5345-5 
 
 5666 
 
 5824.92 
 6052.67 
 
 150 
 150 
 150 
 
 80 
 275 
 275 
 
 275 
 275 
 
 237 
 
 237 
 460 
 
 6 
 6 
 6 
 
 12 
 12 
 
 12 
 
 12 
 12 
 
 40 
 
 4 
 40 
 
 v glimpsed, vx 
 
 
 19.0 
 23.6 
 
 24-5 
 
 15-4 
 14.4 
 
 8.4 
 8.4 
 <i3 
 
 7-8 
 4-9 
 
 < 
 
 3-0 
 < 9 
 
 <I5 
 
 IO.2 
 17.0 
 17.0 
 
 17-8 
 21 .O 
 
 25-7 
 
 4-4 
 27.9 
 
 "95 
 
 II . 12 
 10-97 
 
 12-57 
 12-75 
 13.90 
 
 13.90 
 <i3-o 
 
 14.02 
 
 14.60 
 <I5 6 
 14.99 
 <'3-9 
 
 <I2. 7 
 
 13-52 
 12.30 
 12.30 
 
 12. 18 
 
 i' -59 
 10.79 
 
 14.68 
 10.37 
 10.32 
 
 good 
 good 
 good 
 
 poor 
 good 
 
 good 
 fair 
 
 fine 
 fair 
 
 poor 
 moon 
 
 good 
 fair 
 fair 
 
 fine 
 fair 
 
 good 
 
 poor 
 fair 
 good 
 
 248 
 
 257 
 264 
 
 57 
 68 
 
 87 
 
 101 
 
 36 
 158 
 207 
 
 213 
 
 234 
 246 
 
 253 
 282 
 
 276 
 
 107 
 8 
 9 
 
 O. II 
 
 -0.75 
 
 -0.78 
 
 + 0.24 
 -0.13 
 
 + o. 19 
 
 0.21 
 -0.51 
 
 + o. 15 
 
 + I.I9 
 
 + 0.23 
 -0.13 
 + O.2I 
 
 + 0.23 
 + 0.24 
 
 O.70 
 
 + 0.46 
 + O.O4 
 O.O4 
 
 V<\X, ll2V 
 TJ^ 6# 
 
 23.0, 24.2 
 
 %4y, yiv, u'2y 
 
 
 y2-v, limit v 
 
 
 / y&v limit i <v .... ) 
 
 
 1 angle ydv is a right angle j 
 y8v, limit v 
 
 
 v not seen, limit 3-4 < y. . 
 
 
 {yiav, P$y, via., viy | 
 d is 1 6 magnitude, is > 
 17 magnitude. ) 
 yja, 14-51;, limit v 
 
 6.4, 7.9, 10.4, 6.7. . 
 
 d (is it <5 or v) limit 
 
 
 05-61), 02-3,5, TJO-I-D 
 v is < 
 
 2.8, 2.0, 4.3 
 
 75 
 
 237 
 237 
 460 
 
 150 
 5 
 
 237 
 75 
 
 12 
 
 40 
 40 
 40 
 
 6 
 6 
 
 12 
 
 40 
 
 12 
 
 (photometer ) 
 
 
 -'v not seen, limit 4 < x, 
 ( y glimpsed . ) 
 
 "4, 9-4, 9-8 
 15-5, 18.4 
 17.4, 16.5 
 
 ys-v, vo.vs 1 * (t = ) 
 
 *3-4i>, V2y 
 
 jviy, X2-yi, yil, <6Y, i\&,\ 
 ( limit d. i 1 
 (047), xiv, viy, limit y. . .) 
 -. /is i ith mag. or brighter, > 
 
 (y is ni.. . . ) 
 
 16 
 
 26 
 Nov. 21 
 
 1901 
 Oct. 1 8 
 
 1902 
 Mar. 15 
 Oct. 29 
 
 3 
 3i 
 Nov. 3 
 
 '9 
 24 
 Dec. 26 
 
 1903 
 Tan. 17 
 Mar. 20 
 Apr. 3 
 
 1904' 
 July 27 
 
 31 
 Aug. 27 
 Sept. 3 
 Oct. i 
 8 
 
 18.0, 18.0, 17.4 
 
 m^v, oiv, v$x 
 
 vl 
 
 
 
 ayv, v6 
 
 
 J21I, Vl 
 
 
 photometer 
 
 
 9 
 9 
 
 8 
 
 9 
 
 7 
 
 6 
 17 
 '4 
 
 10 
 12 
 
 8 
 
 IO 
 
 9 
 9 
 
 6053.67 
 6054.63 
 6056.63 
 6072.58 
 6077.63 
 6110.54 
 
 6132.50 
 6194.96 
 6208 . 83 
 
 6689.67 
 6695.75 
 6720.58 
 6727.67 
 6755-63 
 6762.63 
 
 75 
 237 
 237 
 75 
 
 237 
 
 460 
 237 
 237 
 
 12 
 40 
 40 
 12 
 
 24 
 40 
 
 40 
 40 
 40 
 
 24 
 
 photometer 
 
 
 2y, i near limit 
 
 
 
 photometer 
 
 
 
 9.68 
 11.03 
 
 i 9 
 
 12.70 
 
 13-50 
 <*3-8 
 
 <i5 6 
 
 10.5 
 
 10. 16 
 
 ii-3 
 11.71 
 
 <I2.O 
 
 '3 32 
 
 poo 
 good 
 good 
 
 fair 
 
 12 
 
 28 
 
 33 
 66 
 
 88 
 
 -0.72 
 + 0.13 
 
 O. IO 
 
 -0,27 
 
 photometer 
 
 
 
 photograph 
 
 
 
 yi-2v, 1141 
 
 y8v, tiv, V2*, v6-Sy 
 v not seen, limit * 
 
 14-9, '4 6 
 8.4, 9.6, 11.4, 12.7 
 
 14 * 
 
 10.5 
 < 9 
 
 < 
 
 v not seen, limit #, y ;and ff 
 seen. 
 
 photograph 
 
 
 
 
 
 
 fair 
 good 
 good 
 good 
 good 
 fair 
 
 322 
 
 22 
 29 
 
 64 
 
 0.06 
 -4-0.61 
 +0.80 
 
 + 0.62 
 
 v&l 
 
 
 29.7 
 22.4 
 
 2O. 2 
 
 <I9 
 "5 
 
 40 
 40 
 237 
 
 6 
 6 
 do 
 
 m6v, via, v6x 
 
 01-2V, T1IX 
 
 v not seen, x seen 
 
 18.1, 23.0, 25 .0 
 
 2O.5, 20. O 
 
 ysv, vit 
 
 11.4, 1 1. 6 
 
CHAPTER IX. S CYGNI. 
 
 127 
 
 TABLE 76. 7220 S CYGNI. VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C.S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 85 
 86 
 
 8? 
 88 
 89 
 90 
 
 92 
 93 
 94 
 95 
 96 
 97 
 98 
 
 99 
 
 100 
 101 
 
 1 02 
 103 
 104 
 105 
 1 06 
 
 1904 
 Oct. ;8 
 Nov. 6 
 
 1905 
 Jan. 3 
 
 3 
 24 
 28 
 Feb. 14 
 Mar. 24 
 Apr. 4 
 30 
 May 31 
 June 22 
 July 26 
 Aug. 9 
 20 
 
 22 
 
 Sept. 2 
 19 
 Oct. i 
 
 21 
 
 Nov. 1 8 
 Dec. 30 
 
 ii 
 
 6 
 
 7 
 6 
 
 7 
 16 
 
 . 17 
 16 
 
 15 
 9 
 9 
 9 
 9 
 9 
 9 
 ii 
 7 
 10 
 
 9 
 6 
 6 
 
 2410000+ 
 6782 
 6791.71 
 
 6849.50 
 6849.54 
 6870.50 
 6874.52 
 6891 .92 
 6929.95 
 6940 . 92 
 6966 . 8$ 
 
 6977.63 
 7019.63 
 7053-63 
 7067.63 
 7078.62 
 7080.63 
 7091.71 
 7108.54 
 7120.67 
 7140.63 
 7168.51 
 7210.51 
 
 67 
 
 237 
 
 237 
 237 
 450 
 450 
 250 
 150 
 237 
 237 
 150 
 150 
 ISO 
 150 
 237 
 237 
 237 
 237 
 750 
 750 
 450 
 750 
 
 12 
 
 40 
 
 40 
 40 
 40 
 40 
 40 
 6 
 40 
 40 
 6 
 6 
 6 
 6 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 
 i) not seen limit y 
 
 
 <i6-4 
 6-5 
 
 2.6 
 
 < 6 
 8.7 
 ii . i 
 
 19 5 
 18.8 
 20.5 
 
 30.5 
 25.6 
 
 2O. 2 
 17.0 
 
 ii. 8 
 13.0 
 8.0 
 
 7.0 
 
 < 5-7 
 
 I .2 
 
 - 6.0 
 7-9 
 
 <I2.4 
 
 14.29 
 
 15.00 
 
 <i4-4 
 13-87 
 13-39 
 11.85 
 ii 98 
 11.66 
 
 10.00 
 
 10.80 
 11.72 
 12.30 
 13.28 
 13.01 
 
 13-97 
 14. 16 
 
 i5 30 
 16.5 
 14.00 
 
 good 
 fair 
 
 good 
 
 dull 
 good 
 good 
 haze 
 
 good 
 fair 
 good 
 fair 
 good 
 poor 
 good 
 good 
 good 
 poor 
 good 
 good 
 good 
 
 93 
 
 151 
 
 i 7 6 
 193 
 245 
 256 
 282 
 313 
 9 
 43 
 57 
 68 
 70 
 81 
 98 
 
 130 
 158 
 200 
 
 + 0.34 
 
 + 0.49 
 
 0.28 
 0.41 
 -0.32 
 + 0.03 
 +0.26 
 -0.25 
 +0.50 
 + 0.23 
 + 0.29 
 
 + 0.77 
 + 0.36 
 + 0.87 
 + 0.46 
 
 + 0.68 
 
 + 2.0 
 + 0.10 
 
 
 7.4. 6.7. 5. S. - . 
 
 a8l), D3, D3<5 
 
 i-4, 3-3, 2.5 > 
 
 f not seen o. glim psed . . 
 
 
 tS>iov, 173 4 a , v6t 
 ybjv vi 1 
 
 6. i, 11.4, 8.7 
 9. o. 1 1 6 . . 
 
 03-41;, vix 
 
 19.0, 20. o 
 17.0, 19 .0, 20.4 
 20 s (16 6) 
 
 
 
 vl, -vim, -v$n 
 
 02-37J, V2X 
 
 X3-4V, TJ2-3y 
 
 x8-i<yv, yyv, v^t 
 4-51;, t/6y, 1*80 
 
 25.7, 25.1, 26.6 
 
 19-5, 21.0 
 
 15-5, 18.4 
 10.9, 12.6 
 10. o, 13.4, 14.6 
 6.1, 11.7, 8.3 
 
 c 6 7.7.. 
 
 
 
 y6 8i>, &v t v^-d i 
 5 6i> 
 
 -i-3, 0.3, 3.5 
 
 
 5-5, 9-2 
 
128 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 o 
 
 01 
 
 jf 9 
 
 n 
 o 
 n 
 
 II 
 
 1 
 
 si 
 
 m f) 
 
 o 
 o 
 
 . 36 LiGHT-ClJRVB OP S CVGNI. 
 
CHAPTER IX. S CYGNI. 
 TABLE 77. 7220 S CYGNI. MEAN MAGNITUDES FROM 27^ DAY GROUPS. 
 
 129 
 
 Group No .... 
 T D . . 
 
 i 
 
 2 
 
 3 
 82 
 
 4 
 
 5 
 nfi 
 
 6 
 
 ii',: 
 
 7 
 
 8 
 
 9 
 
 IO 
 
 II 
 
 12 
 ttf\ 
 
 
 
 
 
 
 
 
 
 2l l 
 
 244 
 
 272 
 
 299 
 
 326 
 
 r ' 
 
 12 
 
 
 
 
 
 
 
 
 
 26s 
 
 284. 
 
 
 ..._] M 
 
 10.28 
 
 
 
 
 
 
 
 
 
 
 
 
 2 447 JM 
 
 0.18 
 
 
 
 
 
 
 
 
 
 
 
 o 08 
 
 L No. 
 
 2 
 
 
 
 
 
 
 
 
 
 
 3 
 
 
 r t 
 
 '4 
 
 18 
 
 
 
 
 
 
 
 
 
 28l 
 
 
 ,-,-,-, ) M 
 
 10.44 
 
 I I . 13 
 
 
 
 
 
 
 
 
 
 
 
 2 "3 j JM 
 
 O.OI 
 
 O.O2 
 
 
 
 
 
 
 
 
 
 o 08 
 
 
 L No. 
 
 8 
 
 6 
 
 
 
 
 
 
 
 
 J 
 
 
 
 r < 
 
 
 
 
 
 
 
 
 
 
 
 
 
 J M 
 
 
 
 
 
 
 
 
 
 
 
 
 
 399 j JM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 L No. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r * 
 
 
 
 70 
 
 IOI 
 
 
 
 
 
 
 
 
 
 M 
 
 
 
 12.66 
 
 1 1 . OO 
 
 
 
 
 
 
 
 
 
 4402 1 JM 
 
 
 
 + O. IO 
 
 + 0.08 
 
 
 
 
 
 
 
 
 
 L No. 
 
 
 
 2 
 
 2 
 
 
 
 
 
 
 
 
 
 f < 
 
 
 
 
 
 
 
 167 
 
 
 
 ?cft 
 
 
 
 M 
 
 
 
 
 
 
 
 
 
 
 
 
 
 5054 i JM 
 
 
 
 
 
 
 o 87 
 
 O t7 
 
 
 
 
 
 
 L No. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r < 
 
 
 
 
 
 118 
 
 
 
 
 
 
 286 
 
 
 e ,,fi J M 
 
 
 
 
 
 14.68 
 
 
 
 
 
 
 IO 7O 
 
 
 5716 1 JM 
 
 
 
 
 
 -f-O. 17 
 
 
 
 
 
 
 o 56 
 
 
 L No. 
 
 
 
 
 
 I 
 
 
 
 
 
 
 I 
 
 
 r * 
 
 22 
 
 40 
 
 78 
 
 90 
 
 
 
 
 
 
 
 
 
 fin J M 
 
 IO.2I 
 
 II .03 
 
 I2.7O 
 
 13.50 
 
 
 
 
 
 
 
 
 
 JM 
 
 0.40 
 
 0.26 
 
 0.28 
 
 + 0.07 
 
 
 
 
 
 
 
 
 
 L No. 
 
 3 
 
 I 
 
 I 
 
 I 
 
 
 
 
 
 
 
 
 
 r < 
 
 5 
 
 40 
 
 92 
 
 
 
 
 1(,S 
 
 108 
 
 
 
 
 
 firs, J M 
 
 10. 16 
 
 II . 50 
 
 13.80 
 
 
 
 
 I $ OO 
 
 i "* 6"* 
 
 
 
 
 
 6684 ^j JM 
 
 O. 11 
 
 + o. 24 
 
 4-o 12 
 
 
 
 
 O OO 
 
 
 
 
 
 
 L No. 
 
 I 
 
 2 
 
 2 
 
 
 
 
 
 
 
 
 
 
 r < 
 
 
 
 
 
 
 
 
 
 
 
 
 
 j M 
 
 
 
 
 
 
 
 
 
 
 
 
 
 '' i JM . 
 
 
 
 
 
 
 
 
 
 
 
 
 
 I No. ' 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r t 
 
 Means] ^ 
 L No. 
 
 15 
 10 35 
 -0.13 
 
 H 
 
 39 
 1 1 . 20 
 
 + O.OI 
 
 9 
 
 80 
 
 13.13 
 + O. II 
 
 5 
 
 94 
 13-77 
 + 0.08 
 
 3 
 
 118 
 14.68 
 
 + 0-37 
 
 i 
 
 H5 
 14.02 
 0.87 
 I 
 
 1 66 
 
 14.80 
 -0.18 
 
 2 
 
 198 
 13-63 
 -0.44 
 
 2 
 
 232 
 
 12.67 
 +0.14 
 
 4 
 
 259 
 
 II .92 
 
 + O.O2 
 IO 
 
 284 
 11.36 
 + 0.06 
 
 9 
 
 314 
 10.26 
 -0.08 
 
 4 
 
130 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 78 7220 S CYGNI. OBSERVED MAXIMA AND MINIMA. 
 
 Elements of maximum. 1893 October 28 (J. D. 2412765) + 32<!d (E 32). M m= 162*. 
 
 MAXIMA. 
 
 MINIMA. 
 
 ji 
 
 8 
 o, 
 W 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 I 
 
 w 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 Calendar. 
 
 J.D. 
 
 H. 
 
 P. 
 
 Calendar. 
 
 J.D. 
 
 H. 
 
 P. 
 
 32 
 33 
 34 
 37 
 40 
 
 4i 
 42 
 44 
 45 
 
 1893 Oct. 26 
 1894 Sept. 20 
 
 '895 J"ly 25 
 1898 Apr. 16 
 1900 Dec. 27 
 1901 Nov. i 
 1902 Oct. 17 
 1904 July 1 8 
 1905 May 29 
 
 2763 
 3092 
 3400 
 4396 
 538i 
 5690 
 6040 
 6680 
 6995 
 
 10. 10 
 
 10.35 
 me 
 tnc 
 me 
 me 
 10.6 
 10.5 
 10.3 
 10.31 
 
 2 
 
 + i 
 
 -'7 
 + i 
 + 8 
 - 9 
 + 15 
 + 3 
 + 8 
 
 33 
 5 
 
 2 
 I 
 
 6 
 
 r 
 4 
 4 
 
 12 
 
 32 
 
 33 
 34 
 38 
 40 
 42 
 43 
 45 
 46 
 
 1893 May 19 
 1894 Apr. 6 
 1895 Feb. 15 
 1898 Sept. 25 
 1900 July 29 
 1902 Apr. 20 
 1903 Mar. 26 
 1904 Dec. 25 
 1905 Nov. 1 8 
 
 2603 
 2925 
 3240 
 4558 
 5230 
 5860 
 6200 
 6840 
 7168 
 
 15.6 
 
 15-2 
 16.5 
 
 me 
 me 
 me 
 me 
 me 
 me 
 15.8 
 
 15-4 
 16.8 
 
 o 
 - 4 
 -'5 
 
 i 
 
 + 19 
 - 3 
 
 + 13 
 
 4- i 
 + 3 
 
 i 
 
 2 
 
 I 
 
 4 
 8 
 i 
 4 
 '3 
 8 
 
 
 
 
 10.4 
 
 IO.2 
 IO.O 
 
 10.06 
 
 TABLE 79. COMPARISON OP PHOTOMETRIC MAGNITUDES. 
 
 Star. 
 
 H. C. O. 
 Vol. 37- 
 
 H. M. 
 Park- 
 hurst. 
 
 J. A. Parkhurst. 
 
 Star. 
 
 H. C. O. 
 
 Vol. 37. 
 
 H. M. 
 Park- 
 hurst. 
 
 J. A. Parkhurst. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 a 
 c 
 d 
 e 
 
 I 
 
 7.78 
 8.76 
 9.18 
 9 43 
 
 7 93 
 8 99 
 9-25 
 9.66 
 10.27 
 
 7-53 
 
 8.54 
 8.98 
 
 9 39 
 9.87 
 
 7.78 
 8.79 
 9 23 
 9.64 
 
 IO. 12 
 
 / 
 m 
 o 
 
 X 
 
 y 
 
 
 ii . 19 
 
 10.53 
 10.73 
 11.32 
 
 11-95 
 12.31 
 
 10.78 
 10.98 
 "57 
 
 12. 2O 
 12.56 
 
 ii .62 
 
 12. 14 
 I2.9O 
 
 
 
 13-48 
 
 
 UJ 
 Q 
 
 sa 
 
 too 
 
 OAY3 
 ZOO 
 
 300 
 
 +OO 
 
 
 
 ~ A- 
 
 T 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 \ 
 
 
 
 
 
 e a _ 
 
 
 
 
 ZQ&CYC. 
 
 <Nl 
 
 
 
 
 
 \ 
 
 : : : : 7 
 
 
 
 1 1 C 
 
 
 
 
 
 
 
 I \ 
 
 
 
 
 .?x. 
 in. - 
 
 I60<* 
 
 
 
 
 
 
 V 
 
 
 
 
 
 ! / 
 
 r 
 
 ' 1 
 
 M 
 
 
 
 
 
 3 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 _ [ 
 
 
 
 
 
 
 
 
 
 1 1 
 
 
 
 
 
 
 
 i 
 
 1 
 
 
 V 
 
 
 
 
 
 
 
 
 L 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r 
 
 
 
 
 
 
 /^ 
 
 
 
 
 
 / 
 
 
 
 
 
 
 
 
 
 
 
 
 '". \ 
 
 -.__._ 
 
 
 
 
 
 
 
 
 A_ 
 
 
 \ 
 
 
 
 
 
 
 
 
 
 \ _ 
 
 
 
 
 
 
 
 u 
 
 
 
 
 
 
 
 
 
 1 
 
 
 t 
 
 
 
 .-i. 
 
 
 
 
 
 
 5 
 
 
 
 . -L. 
 
 
 
 
 
 
 ] 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 _ _ L_ , 
 
 
 
 
 
 
 
 
 
 _ I -_ 
 
 
 
 f 
 
 
 
 
 
 
 
 
 
 f 
 
 
 
 
 
 
 .. 
 
 
 
 f-- 
 
 
 
 
 
 
 \ 
 
 
 
 f : 
 
 
 
 
 
 
 
 
 
 n 
 
 
 
 
 
 
 
 
 
 
 f-- 
 
 
 
 
 
 W 
 
 
 
 
 f- 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 _ _ _ \ 
 
 
 - _i 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r 
 
 
 
 
 
 
 
 
 
 1 
 
 
 " ~? 
 
 
 
 
 
 
 
 j 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 IS 
 
 
 
 i 
 
 
 
 
 
 
 FIG. 27. MEAN LIGHT-CURVE OF S CYGNI. 
 
CHAPTKR IX. S CYGNI. 131 
 
 The mean light -curve was derived from observations as far as 1905 March 
 24. It shows a steady and rapid decline, with a well-defined minimum, a halt 
 in the rise at about i2th magnitude, and a maximum about as sharp as the mini- 
 mum. The halt in the rise is referred to by Townley as a double maximum, 
 but nothing is shown of it in the mean light-curve published in the Harvard 
 Annals 87, Plate in. In the light-curve, fig. 26, this halt is shown before the 
 maxima of epochs 32, 33, 34, 40, and 45. At the other maxima the observations 
 are too few to furnish evidence. 
 
 LATER NOTE. It was possible to observe the minimum, epoch 46, in the 
 fall of 1905, in better conditions than any previous one. Advantage was taken 
 of an unusually clear night, November 18, to secure photometer measures of the 
 faint comparison star S with the result, 15.48 and 15.73, on the Harvard and 
 Potsdam scales, respectively. The variable was then i6 (corresponding to i6| 
 on the Potsdam scale), the faintest ever observed. 
 
 The difference in scale is very noticeable in Table 79; as compared with 
 mine, the Harvard and H. M. Parkhurst scales are respectively 15 and 16 
 per cent more extended. The reasons for this discordance are not clear, but 
 it should be noted that the measures of the faint stars in the Harvard list all 
 depend on the single star a ( = C of Table 70, color GW) , too slender a basis 
 it would seem, especially as the meridian photometer measures in Volume 44 
 of the Annals depend on three zones, one of which was interrupted and the other 
 two stopped by clouds. It may also be said that the stars x and y were used 
 with the 6-inch, which would make the limit of that instrument about 13.7 if 
 the Harvard scale is accepted. Taking everything into account, it seems probable 
 that the truth lies between the two scales. 
 
CHAPTER X. 
 
 7269 SX CYGNI. 
 R. A. 20*1 urn 33 s. 2| Dec. +30 45' 58" (1900). 
 
 This variable was discovered by Anderson in 1899 and observations began 
 in October of that year, measurements being made of the place of the variable 
 and the brighter comparison stars with the 6-inch. The place given above was 
 derived from the Leyden A. G. stars h and m (=+30 3962 and 3967), and 
 is almost identical with that given by Hart wig, whose observations of the star's 
 variations, not yet published, seem to be the only ones which will be available 
 for comparison with the present series. In the Vierteljahrsschrift 39, 261, Hart- 
 wig derives the period 548 days from the interval between the maxima 1899 
 August 20 (J. D. 4887) and 1904 February 18 (J. D. 6529), using the divisor 3. 
 Reference to the light -curve (fig. 29) shows that the divisor should be 4, which 
 would give 410 days from the above maxima. This is in close agreement with 
 the period 409 days, derived from the present series. 
 
 Consideration of the limits of visibility of the 6- and 1 2-inch, renders it 
 probable that the photometric magnitudes of the stars fainter than p are about 
 half a magnitude too small numerically, and therefore the minimum magnitude 
 of the variable is nearer 14.0 on the Harvard, and 14.4 on the Potsdam scales. 
 
 TABLE 80. 7269 SX CYGNI. STANDARD MAGNITUDE STARS. 
 
 Star. 
 
 B. D. No. 
 
 1900. 
 
 Color 
 P. DM. 
 
 Magnitude. 
 
 Residuals. 
 
 R. A. 
 
 Dec. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nights 
 inter 
 se. 
 
 H.C.O. 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 E 
 F 
 G 
 
 o 
 
 + 29 3948 
 + 31 4001 
 + 31 4020 
 
 Mean . 
 
 h m s 
 20 10 15 
 20 10 17 
 20 12 55 
 
 O / 
 
 + 29 54.2 
 + 31 40.8 
 + 31 ii -9 
 
 VV 
 GW 
 W 
 
 7-03 
 7.38 
 6.83 
 
 7-37 
 7.58 
 7-34 
 
 7.14 
 7-'9 
 6.90 
 
 7-49 
 7-54 
 7-25 
 
 + n 
 -19 
 
 + 7 
 
 + 12 
 
 - 4 
 1 1 
 
 7 
 3 
 4 
 
 7.08 
 
 7-43 
 
 7.08 
 
 7-43 
 
 12 
 
 9 
 
 5 
 
 
 
 
 
 TABLE Si. 7269 SX CYGNI. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 1855- 
 
 Star. 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 btar. 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 
 
 
 h m s 
 
 o / 
 
 
 
 
 
 /< m s 
 
 O / 
 
 m 
 
 + 30 3962 
 
 8.8 
 
 20 9 48 
 
 + 30 49.8 
 
 k 
 
 + 30 3967 
 
 7-7 
 
 20 9 56 
 
 + 30 47.6 
 
 c 
 
 + 30 3963 
 
 9-3 
 
 20 9 48 
 
 + 30 42.2 
 
 I 
 
 + 30 3970 
 
 9.2 
 
 20 10 5 
 
 + 30 2.6 
 
 a 
 
 + 30 3964 
 
 9-1 
 
 20 9 49 
 
 + 30 32.6 
 
 k 
 
 + 3 3973 
 
 94 
 
 20 IO 48 
 
 + 30 1.9 
 
 b 
 
 +30 3965 
 
 94 
 
 20 9 50 
 
 +30 38.4 
 
 
 
 
 
 
 133 
 
134 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 82. COMPARISON STARS FOR 7269 SX CYGNI (IN ORDER OF RIGHT ASCENSION). 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 
 ff 
 
 s 
 
 ff 
 
 
 
 
 
 
 X 
 
 -118 
 
 - 9-2 
 
 ~ 79 
 
 '3-5 
 
 12.50 
 
 12.85 
 
 
 
 y 
 
 - 63 
 
 - 5-o 
 
 4- 17 
 
 7.0 
 
 13-54 
 
 13.89 
 
 
 
 w 
 
 - 55 
 
 - 4-3 
 
 - 32 
 
 10. 
 
 '3 i5 
 
 13-50 
 
 
 
 s 
 
 - 37 
 
 - 2.9 
 
 4- 225 
 
 24.6 
 
 ii .00 
 
 "35 
 
 
 
 p 
 
 4- 7 
 
 + i-3 
 
 4- 140 
 
 22.4 
 
 11.79 
 
 12.14 
 
 
 
 z 
 
 4- 25 
 
 4- 1-9 
 
 4- 18 
 
 o.o 
 
 
 
 14.40 
 
 J4-75 
 
 c 
 
 + 30 
 
 4- 2.3 
 
 4- 252 
 
 38.0 
 
 9.61 
 
 9.96 
 
 
 
 a 
 
 + 57 
 
 + 4-4 
 
 4- 284 
 
 43-0 
 
 8.83 
 
 9. 18 
 
 
 
 n 
 
 4- 59 
 
 4- 4.6 
 
 21 
 
 18.4 
 
 11.84 
 
 12. 19 
 
 
 
 m 
 
 + 33 
 
 + 2.6 
 
 4- 722 
 
 32-5 
 
 9-44 
 
 9-79 
 
 
 
 t 
 
 + 74 
 
 4- 5-7 
 
 4- 10 
 
 ii-5 
 
 
 
 13.00 
 
 13-35 
 
 b 
 
 + 78 
 
 + 6.1 
 
 4- 32 
 
 36.2 
 
 9-87 
 
 IO.22 
 
 
 
 d 
 
 + 103 
 
 + 8.0 
 
 - 26 
 
 3i-3 
 
 10.50 
 
 10.85 
 
 
 
 u 
 
 + 118 
 
 4- 9-1 
 
 - 57 
 
 10.5 
 
 
 
 I3-I3 
 
 13-48 
 
 h 
 
 4- 129 
 
 4-10.0 
 
 4- 616 
 
 52.0 
 
 7-44 
 
 7-79 
 
 
 
 I 
 
 4-179 
 
 4-13-9 
 
 -2043 
 
 36.6 
 
 
 
 9-65 
 
 IO.OO 
 
 f 
 
 + 181 
 
 4- 14.0 
 
 4- 292 
 
 33-3 
 
 
 
 10. 10 
 
 10.45 
 
 k 
 
 + 259 
 
 4-20. I 
 
 -2124 
 
 37-6 
 
 
 
 9-5' 
 
 9.86 
 
 g 
 
 + 284 
 
 4-22. O 
 
 - 251 
 
 34- 2 
 
 
 
 9.98 
 
 10.33 
 
 TABLE 83. 7269 SX CYGNI. PHOTOMETER MEASURES OF COMPARISON STARS. 
 
 1904 September 5. 6-INCH. Good, somewhat dull. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 A m 
 20 5 
 
 20 31 
 
 
 
 IO 
 13 
 
 F 
 
 GOT 
 C 
 b 
 
 a 
 h 
 E 
 E 
 k 
 a 
 b 
 c 
 G 
 F 
 
 10. 2 9.9 10. 2 
 12.5 13.1 13.0 
 29. 7 29.6 29. i 
 2 9 5 30 . 1 30 . 6 
 
 23.5 22.8 23.3 
 
 13.9 14.2 14.2 
 
 9.6 9.8 9.2 
 
 IO.O IO.2 IO.2 
 13.8 14.0 14.5 
 24.0 24.2 23.2 
 32.1 32.6 33.0 
 
 3 r -9 31-7 3'.8 
 9.4 9.0 8.4 
 11.7 ii .8 ii. 6 
 
 IO. 10 
 
 12.87 
 29.47 
 30.07 
 23.20 
 14. 10 
 
 9-53 
 10. 13 
 14. 10 
 23.80 
 32.57 
 3'-8o 
 8-93 
 ii . 70 
 
 10.90 
 
 0.38 
 0.62 
 2.76 
 2.84 
 1.98 
 0.80 
 0.27 
 
 7-23 
 7-47 
 9.61 
 9.69 
 8.83 
 7.65 
 7.12 
 
 7.58 
 7.82 
 9.96 
 10.04 
 9.18 
 8.00 
 7-47 
 
 30.64 
 31-32 
 23.50 
 14. 10 
 9-83 
 
 
STELLAR PHOTOMETRY. 
 
 N 
 
 PLATE 10. 
 
 m 
 
 *' ' 
 
 .. 
 
 * 
 
 . 
 
 7 ' 
 
 . n 
 u 
 
 .* 
 
 . 
 
 Scale, i mm= 13". 6. 
 
 1902 Novenjber-3<3. 
 
 7269 SX CYGNI. 
 R. A. 2ol> iim 33 5 .2. Dec. +30 45' 58", 1900. 
 
CHAPTER X. SX CYGNI. 135 
 
 TABLE 83. 7269 SX CYGNI. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1904 October i. 6-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 22 4 
 
 22 21 
 
 O 
 
 26 
 28 
 29 
 
 F 
 Gai 
 C 
 b 
 a 
 E 
 Eai 
 
 E 
 a 
 b 
 c 
 
 Gal 
 
 F 
 
 9.2 10.2 9.2 
 
 13-5 13-5 13-3 
 29.7 30.9 30.0 
 31.5 32.0 31.6 
 26.4 26.2 26.3 
 10.6 9.0 9.7 
 16.6 15.9 16.0 
 
 IO.2 IO.2 II. O 
 
 23.2 24.1 23.9 
 31.0 31.1 31.9 
 30.2 31.0 30.0 
 13.0 14.1 13.8 
 9-7 9-9 9-3 
 
 9-53 
 13-43 
 30.20 
 31.70 
 26.30 
 
 9-77 
 16. 17 
 10.47 
 23-73 
 31-33 
 30.40 
 
 13-63 
 9-63 
 
 9.58 
 13-53 
 30.30 
 31-52 
 25.02 
 
 IO. 12 
 
 0.25 
 0.72 
 2.72 
 2.87 
 
 2.13 
 0.29 
 
 1.20 
 
 7.14 
 7.61 
 9.61 
 9-76 
 9.02 
 7.18 
 8.09 
 
 7-49 
 7.96 
 9.96 
 
 IO. II 
 
 9-37 
 7-53 
 8.44 
 
 
 1904 October 2. Good. 
 
 22 5 
 22 21 
 
 27 
 29 
 
 Fa, 
 Ga 
 h 
 c 
 b 
 a 
 E a i 
 Eai 
 a 
 b 
 c 
 h 
 
 Gal 
 Fa. 
 
 '3-5 13-9 14-0 
 12.3 13.2 12.5 
 10.4 10. o 9.3 
 29.8 29.0 28.8 
 30.0 31.0 30.2 
 20. 2 20.7 20. 6 
 
 12.5 13.8 13.1 
 12.9 13.8 13.4 
 
 22. I 21 .9 22.3 
 30.1 29.8 29.7 
 28.9 27.9 28.5 
 IO. I IO.9 IO.2 
 12.4 12.3 12.4 
 14.8 14.7 14.2 
 
 13.80 
 12.67 
 9.90 
 29.20 
 
 30.73 
 20.50 
 
 13-13 
 13.37 
 
 22. IO 
 29.87 
 
 28.43 
 10.40 
 
 12-37 
 14-57 
 
 14.19 
 12.52 
 
 10. 15 
 
 28.82 
 30 30 
 21.30 
 13 25 
 
 0.81 
 
 0.58 
 0.29 
 2.54 
 
 2-75 
 1.74 
 0.67 
 
 7-95 
 
 7.72 
 
 7-43 
 9.68 
 9.89 
 8.88 
 7.81 
 
 8.30 
 8.07 
 7.78 
 10.03 
 10.24 
 9 23 
 8.16 
 
 
 
 
 
 1904 October 28. 12-INCH. Good, moon rising at end. 
 
 22 44 
 
 23 o 
 
 32 
 34 
 
 m 
 h ai 
 c 
 s 
 
 P 
 b 
 d 
 a 
 a 
 d 
 b 
 
 P 
 s 
 c 
 hai 
 m 
 
 19.4 19.6 19.9 
 
 9.8 10.1 9.7 
 
 21 .O 21 .7 21 .5 
 
 36.1 35-9 35 9 
 42. i 42.2 41.8 
 27.8 26.7 26.0 
 30.8 30.8 30.0 
 14.0 15.3 14.1 
 16. i 16.0 15.9 
 31.9 31.1 30.1 
 25.9 26.0 25.8 
 
 43-9 43-7 43-1 
 35.2 36.0 35.0 
 19.5 20. i 20. i 
 
 II. I II .2 IO.9 
 2O. 2 21 .1 21. O 
 
 19 63 
 9.87 
 21 .40 
 
 35-97 
 42.03 
 26.83 
 30.53 
 14-47 
 
 16.00 
 31-03 
 25-90 
 43-57 
 35.40 
 19.90 
 ii .07 
 20.77 
 
 2O.2O 
 10.47 
 20.65 
 35.69 
 
 42.80 
 26.37 
 
 30.78 
 15 24 
 
 i-73 
 0.49 
 1.78 
 
 3.27 
 4.08 
 2.31 
 
 2-74 
 1.09 
 
 9 44 
 
 8.20 
 
 9 49 
 10.98 
 11.79 
 
 IO.O2 
 
 10.45 
 8.80 
 
 9 79 
 
 8 55 
 9.84 
 
 'I 33 
 
 12. 14 
 
 10-37 
 10.80 
 
 9-15 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
136 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 83. 7269 SX CYGNI. PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1904 November i. 12-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 22 2O 
 
 22 35 
 
 o 
 
 28 
 30 
 
 a 
 d 
 b 
 
 P 
 s 
 c 
 hat 
 
 m 
 c 
 s 
 
 P 
 b 
 d 
 a 
 
 20. o 19.3 19.8 
 36.8 36.1 36.0 
 29.2 28.9 29.7 
 47-9 47-3 46-9 
 38-9 39-t 39-7 
 29.2 29. i 29.2 
 15.7 15.8 14.6 
 26.9 26.7 25.7 
 27.2 26.8 27.3 
 41.1 41.3 41.7 
 47-7 47-8 48.3 
 29-4 29.8 30.3 
 
 35-7 36-9 37-4 
 19.4 19.3 19.3 
 
 19.70 
 36-30 
 29.27 
 
 47-37 
 39 23 
 29.17 
 
 15-37 
 26.43 
 27. 10 
 41-37 
 47-93 
 29-83 
 36-67 
 19-33 
 
 I9-52 
 36.49 
 29-55 
 47.65 
 40.30 
 28. 14 
 
 1.65 
 3.36 
 2.61 
 
 4-59 
 3.81 
 
 2-57 
 i .09 
 
 2.32 
 
 8.81 
 10.52 
 9-77 
 "75 
 10.97 
 
 9-73 
 8.25 
 9.48 
 
 9. 16 
 10.87 
 
 IO. 12 
 12. IO 
 11.32 
 10.08 
 8.60 
 9-83 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 November 3. Good. 
 
 23 12 
 23 34 
 
 37 
 4i 
 
 m 
 Aai 
 
 c 
 
 s 
 
 p 
 b 
 
 d 
 a 
 a 
 d 
 b 
 
 P 
 s 
 c 
 hat 
 m 
 
 18.3 19.3 19.2 
 
 IO.I IO.2 II. 2 
 22.8 22.8 21 .9 
 36.1 36.0 36.0 
 
 43-o 43.5 43.3 
 
 21 .9 22.7 22.6 
 31.8 31.7 31.9 
 '5-7 15-1 15-6 
 
 15.4 16.0 15.4 
 30.4 30.2 30.4 
 24.0 24.2 23.3 
 
 41 .6 41.9 41.2 
 35-7 35-2 35.8 
 20. o 20. o 19.4 
 
 13.8 12. I 13.0 
 
 19.0 19.7 20. o 
 
 18.93 
 10.50 
 22.50 
 36.03 
 43-27 
 22.40 
 31.80 
 
 15-47 
 15.60 
 
 30-33 
 23-83 
 41-57 
 35-57 
 19.80 
 12.97 
 '9-57 
 
 19-25 
 11.49 
 21.15 
 35-80 
 42.42 
 23.12 
 3' -07 
 '5 49 
 
 1.62 
 0.60 
 1.84 
 3.28 
 4.04 
 2.04 
 2.76 
 i . it 
 
 9.40 
 8.38 
 9.62 
 ii. 06 
 11.82 
 9.82 
 
 10-54 
 8.89 
 
 9-75 
 8-73 
 9-97 
 ii .41 
 12.17 
 10. 17 
 10.89 
 9.24 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1900 October 17. 40-INCH, WEDGE II. Images very large and unsteady. 
 
 24 
 
 
 s 
 
 P d 
 n 
 
 y 
 
 w 
 
 X 
 X 
 
 w 
 
 y 
 
 n 
 d 
 
 P 
 s 
 
 22. 2O. I 2O. O 
 32 9 33-0 32.6 
 
 18.8 19.6 19.2 
 31.6 32.8 32.0 
 48.2 50.0 48.0 
 42.0 43.5 43.2 
 34-i 35-8 37.2 
 32.0 34.9 34.0 
 37-4 35-o 36.0 
 42.0 40. i 41.2 
 25-9 27.7 23.8 
 
 '3-5 '9-5 20.2 
 26.8 24.5 25.9 
 18.3 20.0 20. I 
 
 20.70 
 32-83 
 19.20 
 
 32-13 
 48.73 
 42 90 
 35-70 
 33.63 
 36.13 
 41 . 10 
 25.80 
 17-73 
 25-73 
 '9-47 
 
 20.09 
 29.28 
 18.47 
 28.97 
 44.92 
 39-52 
 34-6? 
 
 1.72 
 2.58 
 i-5i 
 2.56 
 4-3 
 3-72 
 3-i6 
 
 10.88 
 11.74 
 10.67 
 ii . 72 
 
 13.47 
 12.88 
 12.32 
 
 11.23 
 12.09 
 ii .02 
 12.07 
 13.82 
 
 13-23 
 12.67 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER X. SX CYGNI. 137 
 
 TABLE 83. 7269 SX CYGNI. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1902 October 24. 40-INCH, WEDGE V. Seeing good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 MeanScale Readings. 
 
 c. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h in 
 
 21 30 
 22 OO 
 
 
 s 
 
 P d 
 n 
 
 v 
 
 y 
 
 IV 
 X 
 X 
 
 w 
 
 y 
 
 n 
 d 
 
 P 
 s 
 
 15.8 17.0 17.8 
 27.0 27.0 26.0 
 14.0 12.6 13.3 
 28.0 29.2 29.4 
 25.7 24.8 24.9 
 43-o 43-2 43-6 
 40.8 40.3 40.0 
 34-5 34-3 34-2 
 34-4 34-5 35-o 
 39.2 40.7 40.8 
 44-8 45-4 44-o 
 30.2 27.8 29.4 
 15.2 14.8 15.8 
 27.5 27.2 27.7 
 20. o 20. o 20. o 
 
 16.87 
 26.67 
 I3-30 
 
 28.87 
 25-13 
 43-27 
 40.27 
 
 34-33 
 34 - 6 3 
 40-23 
 
 44-73 
 29-I3 
 15-27 
 27-47 
 20.00 
 
 18.44 
 27-07 
 14.29 
 29.00 
 
 1.50 
 
 2.38 
 1-03 
 2-55 
 
 2.21 
 4-21 
 3-80 
 
 3- '3 
 
 10.96 
 11.84 
 10.49 
 
 12. OI 
 II .67 
 13-67 
 13.26 
 12-59 
 
 11.31 
 
 12. 19 
 IO.84 
 12.36 
 1 2. 02 
 14.02 
 13.61 
 12.94 
 
 44.00 
 40.25 
 34-48 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1902 November 3. WEDGE V. Seeing fair to poor. 
 
 i 20 
 
 
 s 
 
 p d 
 
 n 
 
 V 
 
 y 
 
 Til 
 X 
 X 
 
 w 
 
 y 
 
 n 
 d 
 
 P 
 
 s 
 
 35-2 35-7 35-8 
 40.0 40.0 40.0 
 25.7 25.8 27.0 
 38.0 40.5 41.8 
 36.9 36.1 36.8 
 56.9 59-8 58-1 
 53-o 53-7 54-5 
 46.9 47.2 46.7 
 46 . i 48 . i 47.7 
 
 57-5 57-5 56-3 
 58.6 58.7 60.3 
 37-7 38.7 39-2 
 24.1 25.5 26.9 
 39-6 39-4 39-5 
 34-o 33-3 33-3 
 
 35-57 
 40.00 
 26. 17 
 
 40-77 
 36.60 
 
 58.27 
 53-73 
 46.93 
 47-30 
 57-1 
 59-20 
 
 38.53 
 25-50 
 39-50 
 
 33-53 
 
 34-55 
 39-75 
 25-84 
 39-65 
 
 3-14 
 3-75 
 2.27 
 
 3-74 
 3-38 
 5-43 
 5-25 
 4-54 
 
 II. 19 
 II.80 
 10.32 
 11.79 
 
 II-43 
 13-48 
 13-30 
 12-59 
 
 II-54 
 12.15 
 10.67 
 
 12. 14 
 11.78 
 13.83 
 13-65 
 12.94 
 
 58-74 
 55-42 
 47-12 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 * 
 
 
 
 
 
 
 
 
 
138 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 is 
 
 13 
 
 MAGNITUDE 
 12 II 10 
 
 SO 
 
 7Z69 SX CYGNI 
 
 10 
 
 n. . 
 
 FIG. 28. MAGNITUDE-CURVE FOR KX CYGNI. 
 
 TABLE 84. 7269 SX CYGNI. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 1904 September 5. 
 
 1904 October i. 
 
 1904 October 2. 
 
 C. 
 
 Obs. Mag. 
 
 J Mag. 
 
 C. 
 
 Obs. Mag. 
 
 JMag. 
 
 C. 
 
 Obs. Mag. 
 
 4 Mag. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 p. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. P. 
 
 E ... 
 F... 
 
 G .. 
 
 0.27 
 0.38 
 0.03 
 
 7.12 
 
 7-23 
 6.72 
 
 7-47 
 7.58 
 7.07 
 
 + .09 
 
 -15 
 . ii 
 
 + .10 
 .00 
 
 - .27 
 
 o.35 
 0.25 
 -0.03 
 
 7.24 
 
 6.se 
 
 7-59 
 7-49 
 7.21 
 
 + .21 
 -.24 
 + .03 
 
 + .22 
 -.09 
 
 -0.08 
 0.06 
 -0.17 
 
 7.06 
 7. 20 
 6.97 
 
 7.41 
 7-55 
 7-32 
 
 4- .03 4- .04 
 - .18 - .03 
 
 -1- . 14 - .02 
 
 Means. 
 
 Mo.... 
 
 0.23 
 
 7.08 
 6.85 
 
 7-43 
 7.20 
 
 .I2 
 
 .09 
 
 o. 19 
 
 7.08 
 6.89 
 
 7-43 
 7.24 
 
 .16 
 
 '5 
 
 0.06 
 
 7.08 
 7-14 
 
 7-43 
 7-49 
 
 .12 .03 
 
 12-INCH. 
 
 40-INCH. 
 
 Star. 
 
 Mag. 
 6-inch. 
 
 C. 
 
 Star. 
 
 Mag. 
 12-inch. 
 
 C. 
 
 Oct. 28. 
 
 Nov. i. Nov. 3. 
 
 Oct. 24. 
 
 Nov. 3. Oct. 17. 
 
 o 
 
 8.91 
 9.78 
 
 i .09 
 
 i.yS 
 
 1.65 i.n 
 
 2 . 6 1 2 . 04 
 2-57 1.84 
 
 i 
 
 10.50 
 11.79 
 
 11.00 
 
 1.03 
 
 2.38 
 1.50 
 
 2.27 1.51 
 3-75 2.58 
 3.H 1-72 
 
 6 
 
 
 c 
 
 f 
 
 Hem 
 
 Meat 
 
 Mo . 
 
 i C . . 
 
 Mea 
 Mea 
 
 Mo 
 
 n C.. . . 
 n Mag. 
 
 
 i-73 
 9-44 
 
 2.28 1.66 
 
 9-44 9-44 
 7.16 7.78 
 
 II . IO 
 
 i .64 
 
 II . IO 
 
 9.46 
 
 3 05 i 94 
 
 II . IO II . IO 
 
 8.05 9.16 
 
 i Mag. . 
 
 9-44 
 
 
 
 
 
CHAPTER X. SX CYGNI. 
 
 TABLE 85. 7269 SX CYGNI. MEAN MAGNITUDES OF COMPARISON STARS. 
 
 139 
 
 6-INCH. 
 
 Star. 
 
 September 5. 
 
 October i. 
 
 October 2. 
 
 Mean. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 4 Mag. 
 
 E 
 
 7.12 
 
 7-23 
 6.88 
 
 O.02 
 + 0.04 
 O.O2 
 
 7.24 
 
 7-i4 
 6.86 
 
 + O. IO 
 
 0.05 
 0.04 
 
 7.06 
 7.20 
 6 97 
 
 0.08 
 
 + O.OI 
 
 +0.07 
 
 7-H 
 7.19 
 6.90 
 
 7-49 
 7-54 
 7-25 
 
 0.07 
 0.03 
 0.04 
 
 F . . 
 
 G 
 
 Mean 
 
 7.08 
 
 7-43 
 
 0.05 
 
 a 
 
 8.83 
 9.69 
 9.61 
 7-65 
 
 -0.08 
 0.09 
 
 O.O2 
 + O. II 
 
 9.02 
 9.76 
 9.61 
 
 + O. II 
 0.02 
 0.02 
 
 8.88 
 9.89 
 9.68 
 7-43 
 
 0.03 
 
 -f-O. II 
 
 + 0.05. 
 
 O. II 
 
 8.91 
 9.78 
 9-63 
 
 7-54 
 
 9.26 
 10.13 
 9.98 
 7.89 
 
 0.07 
 0.07 
 0.03 
 
 O. II 
 
 b 
 
 c . . 
 
 I, 
 
 Mean 
 
 8.97 
 
 9-32 
 
 0.07 
 
 
 
 
 
 
 
 
 12-INCH. 
 
 Star. 
 
 October 28. 
 
 November i. 
 
 November 3. 
 
 Mean. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 4 Mag. 
 
 a 
 
 8.80 
 
 IO.O2 
 
 9-49 
 
 -0.03 
 + 0.15 
 
 O. 12 
 
 8.81 
 9-77 
 9-73 
 
 O.O2 
 O. 10 
 + O. 12 
 
 8.89 
 9.82 
 9.62 
 
 + 0.06 
 + 0.05 
 
 + O.OI 
 
 8.83 
 9.87 
 9.61 
 
 9.18 
 
 IO.22 
 9.96 
 
 0.04 
 o. 10 
 0.08 
 
 6 .... 
 
 c . . . 
 
 Mean 
 
 9-44 
 
 9-79 
 
 0.07 
 
 d 
 
 10.45 
 7.36 
 "79 
 10.98 
 
 9 '44 
 
 -0.05 
 0.08 
 o.oo 
 
 O.O2 
 
 o.oo 
 
 10.52 
 7.41 
 
 "75 
 10.97 
 
 9-48 
 
 + O.O2 
 0.03 
 O.O4 
 -0.03 
 + 0.04 
 
 10.54 
 
 7-54 
 11.82 
 it .06 
 9.40 
 
 + 0.04 
 
 + O. IO 
 
 +0.03 
 +0.06 
 0.04 
 
 10.50 
 
 7-44 
 11.79 
 ii .00 
 9-44 
 
 10.85 
 7-79 
 
 12. 14 
 
 "35 
 9-79 
 
 0.04 
 0.07 
 0.02 
 0.04 
 0.03 
 
 h 
 
 p . 
 
 s 
 
 m 
 
 Mean 
 
 10.03 
 
 10.38 
 
 0.05 
 
 
 
 
 
 
 
 
 40-INCH. 
 
 Star. 
 
 October 24. 
 
 November 3. 
 
 October 17. 
 
 Mean. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 d Mag. 
 
 d 
 
 10.67 
 11.74 
 10.88 
 
 + 0.18 
 -0.05 
 -0.13 
 
 10.49 
 n .84 
 10.96 
 
 o.oo 
 +0.05 
 0.05 
 
 10.32 
 ii .80 
 ii . 19 
 
 -0.17 
 
 + O.OI 
 
 +0.18 
 
 10.49 
 11.79 
 ii .01 
 
 10.84 
 
 12. 14 
 11.36 
 
 O. 12 
 
 0.04 
 O. 12 
 
 p 
 
 s 
 
 Mean 
 
 II . IO 
 
 "45 
 
 0.09 
 
 n . . 
 
 11.72 
 
 12.88 
 12.32 
 '3-47 
 
 0.12 
 O.27 
 
 -o. 18 
 0.07 
 
 12. OI 
 
 13.26 
 12.59 
 13.67 
 
 + o. 17 
 
 + O. II 
 
 + 0.09 
 +0.13 
 
 11.79 
 13-30 
 12.59 
 13-48 
 
 0.05 
 +0.15 
 + 0.09 
 0.06 
 
 11.84 
 
 13-15 
 12.50 
 
 '3-54 
 
 12. 19 
 I3.50 
 12.85 
 
 I3.89 
 
 0.08 
 
 0.18 
 
 O. 12 
 0.09 
 
 w 
 
 
 v. . 
 
 Mean 
 
 12.76 
 
 13.11 
 
 O. 12 
 
 
 
 
 
 
 
 
140 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 86. 7269 SX CYGNI. VISUAL OBSERVATIONS OF THE VARIABLE. 
 
 No. 
 
 Date. 
 
 O 
 
 1 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 " ~~- 
 A Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C.S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 i 
 
 2 
 
 3 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 
 IO 
 
 ii 
 
 12 
 13 
 
 14 
 15 
 16 
 17 
 
 18 
 
 '9 
 20 
 
 21 
 22 
 23 
 24 
 25 
 26 
 
 27 
 
 28 
 
 29 
 30 
 
 3 
 
 32 
 33 
 34 
 35 
 36 
 37 
 38 
 
 39 
 40 
 
 41 
 42 
 43 
 44 
 45 
 
 46 
 
 47 
 
 48 
 49 
 50 
 
 1899 
 Oct. 12 
 
 17 
 20 
 
 23 
 28 
 Nov. 3 
 8 
 
 J5 
 20 
 
 25 
 Dec. 4 
 19 
 
 27 
 
 1900 
 Jan. 2 
 
 22 
 24 
 
 31 
 
 Mar. 2 
 6 
 
 15 
 
 22 
 
 Apr. 4 
 6 
 May i 
 
 2 
 
 ii 
 
 28 
 29 
 June 13 
 23 
 July 1 6 
 Aug. 6 
 8 
 
 3 
 18 
 28 
 Sept. 4 
 15 
 
 21 
 
 Oct. 10 
 26 
 Nov. 15 
 29 
 Dec. ii 
 29 
 
 1901 
 Oct. 31 
 
 Dec. 21 
 
 1902 
 Mar. 28 
 July to 
 Oct. 7 
 
 8 
 6 
 
 8 
 
 7 
 8 
 6 
 6 
 6 
 6 
 
 7 
 6 
 6 
 
 6 
 6 
 
 7 
 7 
 13 
 17 
 
 J7 
 
 16 
 16 
 16 
 '4 
 15 
 
 12 
 12 
 IO 
 9 
 9 
 9 
 9 
 9 
 9 
 8 
 
 7 
 9 
 7 
 7 
 6 
 6 
 6 
 7 
 
 8 
 '3 
 
 15 
 9 
 
 IO 
 
 2410000+ 
 4940.58 
 
 4945 50 
 4948 52 
 4951 56 
 4956.52 
 4962 . 58 
 4967 . 50 
 4974-50 
 4979 50 
 4984.50 
 
 4993-54 
 5008 . 50 
 5016.50 
 
 5022 . 50 
 5042 . 50 
 5044 52 
 5051-52 
 5081.79 
 5085 . 96 
 
 5094 95 
 5101.92 
 5114-90 
 5116.92 
 5141-85 
 5142.88 
 
 5151-83 
 5168.83 
 
 5169-75 
 
 5194-67 
 5217-63 
 5238.63 
 5240-63 
 
 5245-63 
 5250.63 
 5260.63 
 5267.58 
 5278.54 
 5284.63 
 5303 54 
 53I9.54 
 5339-50 
 5353-50 
 5365 50 
 5383-50 
 
 5689.58 j 
 574 79 
 
 5837 88 
 5941.63 
 6030.67 
 
 So 
 
 80 
 80 
 ISO 
 150 
 150 
 "50 
 150 
 150 
 150 
 150 
 ISO 
 ISO 
 
 150 
 'SO 
 200 
 200 
 275 
 150 
 
 350 
 
 350 
 
 275 
 350 
 275 
 350 
 460 
 
 275 
 237 
 460 
 200 
 150 
 150 
 150 
 150 
 150 
 150 
 40 
 150 
 40 
 150 
 150 
 ISO 
 '50 
 'SO 
 'SO 
 
 80 
 
 275 
 350 
 
 237 
 80 
 80 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 
 12 
 
 6 
 40 
 40 
 
 12 
 
 40 
 12 
 40 
 4 
 12 
 4 
 40 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 12 
 
 3 
 
 12 
 40 
 
 40 
 12 
 12 
 
 ( vib, vie, v^d, 0451). . . 
 < vik, V2l, h&-ioa, 04-51' 
 
 ( VIC, V2b, &3/, J2d, b2g . 
 
 06 7, i>ifc, vie, V2m. . . . 
 
 CO-IV, Vl-2b 
 
 37-2, 39-0, 35.3, 38.5 
 
 39-5, 38.5, 38.5 
 39 o 38 2 . . 
 
 '-38.2 
 
 37-6 
 37-4 
 35-5 
 34-8 
 34-2 
 34-2 
 32.2 
 32-0 
 31.5 
 
 29.8 
 28.4 
 
 26.8 
 
 <3>-3 
 19.4 
 
 <2 3 
 
 12.4 
 <i8.4 
 
 9.41 
 
 9-52 
 9-53 
 9.80 
 9.90 
 9.98 
 9.98 
 10.26 
 10.28 
 
 10.35 
 10.31 
 10.60 
 10.77 
 
 ii .00 
 
 <io.4 
 11.98 
 
 <n.5 
 
 12.89 
 
 13 i 
 12.90 
 13-31 
 13-23 
 <I3-0 
 13-17 
 13.11 
 12.98 
 
 12-75 
 12.47 
 12.31 
 11.68 
 II-57 
 ii. 7 
 11.13 
 10.70 
 10. 06 
 9-85 
 9-43 
 8.89 
 
 9-37 
 9-50 
 9.86 
 10.39 
 
 10-45 
 ii .20 
 
 8.66 
 
 9.24 
 
 11-43 
 
 < 1 2 . 3 
 12. I 
 
 moon 
 
 moon 
 good 
 good 
 good 
 fair 
 fair 
 good 
 fair 
 fair 
 good 
 fair 
 good 
 
 good 
 low- 
 poor 
 low 
 good 
 fair 
 
 poor 
 
 good 
 good 
 poor 
 poor 
 fair 
 fair 
 good 
 good 
 fair 
 good 
 good 
 moon 
 moon 
 good 
 good 
 good 
 moon 
 good 
 
 good 
 good 
 good 
 good 
 good 
 fair 
 
 moon 
 
 good 
 good 
 good 
 
 o 
 
 5 
 8 
 ii 
 16 
 
 22 
 
 27 
 
 34 
 39 
 44 
 53 
 68 
 76 
 
 82 
 1 02 
 104 
 
 141 
 146 
 
 155 
 162 
 '75 
 177 
 202 
 203 
 
 212 
 229 
 230 
 245 
 255 
 277 
 298 
 300 
 305 
 310 
 320 
 327 
 338 
 
 363 
 
 379 
 399 
 4 
 16 
 
 34 
 340 
 
 80 
 
 272 
 
 O.22 
 
 -o. 18 
 -0.24 
 o.oo 
 +0.03 
 o oo 
 0.06 
 
 + O. IO 
 
 0.04 
 
 + O.O2 
 
 o. 20 
 
 O.22 
 O.26 
 
 O.22 
 O.O4 
 O. II 
 
 O.O4 
 -0.32 
 
 o.ot 
 0.07 
 
 + 0.03 
 + 0.06 
 +0.14 
 -0.05 
 -0.13 
 
 O. 12 
 
 -0.34 
 + 0.04 
 + 0.23 
 O. IO 
 -0-37 
 -0.28 
 + 0.05 
 + O. II 
 
 4-0.30 
 +0.29 
 4-0.36 
 + 0.69 
 + 0.60 
 
 +0.95 
 
 0.56 
 o. 16 
 
 + 0.23 
 o oo 
 
 36.5, 37-2, 39-o, 34-5 
 37-o, 37-7 
 34.8, 36.2 
 
 biv, i'3d, limit n 
 
 35-3, 34-3 
 34.2, 34. -5 
 
 641', vid 
 641;, vo-id 
 b$v, vo-id 
 651* vid 
 
 34- 2 . 34-3 
 32.2, 32.3 
 32.2, 31.8 
 31-2, 31-8 
 31.2, 32.3 
 
 dl2V . . . . 
 
 
 0*4 51? vio . . 
 
 26.8, 30.1 
 
 d^v, vo, TJ2-T,p 
 v not seen limit d 
 
 26.3, 29.1, 24.9 
 
 pyv, vin, limit w 
 v not seen, limit 4 < o . . . . 
 
 19-4, 19.4 
 
 <25I, < 22 
 
 12-4 
 
 v not seen, n not seen 
 
 
 (i> is i to i J M <n, v near^ 
 (limit 3 
 
 
 12.0, 12.5, 12-5 
 9.O, 9.0 
 
 9.5, 10.0, 10.0 
 
 12.3 
 9.0 
 9-8 
 <n 5 
 
 10.2 
 
 10.7 
 
 ii. 8 
 13-6 
 15-9 
 16.9 
 
 21.8 
 22.6 
 21.6 
 
 25-8 
 29.0 
 33-5 
 35-2 
 38.1 
 
 1)210, Vlt, till, XIV, X2VI . . . . 
 
 wiv, ti-2v, v glimpsed. . . . 
 x^v, Tin, V3y 
 v suspected, t and y not held 
 x^v, viw, V3y 
 
 n6-8u, xi-2V, V2W, limit w. 
 ni\v, vx, vyw, wioz, limit z. 
 
 9.5, n.o, 10.0 
 10.0, 10.5, 11.5 
 
 1 1.4, I2.O, 12 O 
 
 14.4, 13.5, 13.0 
 
 15.4, 16.5, 16.5, 15.0 
 
 ni2v, limit i <r 
 
 syv, Tip, Tiyi 
 S2V, limit v 
 
 21.6, 22.4, 21.4 
 
 S3T>, limit v 
 
 
 vi s, i'4-5/>, vSn, dSv 
 div, V3s 
 6311, vi 2d 
 biv, v6d 
 0511, vib, vie 
 photometer 
 
 25.6, 26.9, 26.4,23.3 
 30.3, 27.6 
 
 33-2, 33-8 
 34-2, 37-3 
 38.0, 37.2, 39.0 
 
 0511, 1136 
 a$v, TIC, vib 
 
 6451*, do- iv, 75 6s 
 
 V1-2O } 
 
 38.0, 39.2 
 38.0, 38.0, 37.2 
 35-5. 34-2, 35-3 
 31-7, 31-3. 30.6 
 31.7, 30.8, 29.9 
 25-3, 24.6, 26.4 
 
 38-6 
 
 37-7 
 35 o 
 31-2 
 30.8 
 
 25.2 
 
 43-8 
 39 5 
 
 23.6 
 
 <i7-4 
 18.4 
 
 va < 
 
 44-5 t 
 
 Iimit6<n,2<,i <ic,2<#) 
 
 43-0 ) 
 
 0*5-61', V3n 
 v not seen, limit i< 
 
 25.8, 21.4 
 
 i>n i 
 
 
 
 
CHAPTER X. SX CYGNI. 
 
 141 
 
 TABLE 86. 7269 SX CYGNI VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No 
 
 Date. 
 
 1 
 
 8 
 
 1 
 i 
 & 
 
 < 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day 
 
 Hour 
 C.S.T 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 5' 
 52 
 53 
 54 
 55 
 
 56 
 
 57 
 
 58 
 59 
 60 
 
 61 
 
 62 
 
 63 
 64 
 
 65 
 
 66 
 
 67 
 68 
 69 
 70 
 7i 
 72 
 73 
 74 
 75 
 76 
 77 
 78 
 79 
 80 
 81 
 
 1902 
 Oct. 24 
 
 3' 
 Nov. 3 
 
 30 
 Dec. 26 
 
 1903 
 Oct. 1 1 
 '3 
 
 1904 
 July 31 
 Aug. 3 
 27 
 Sept. 24 
 
 Oct. 6 
 
 28 
 Nov. 30 
 
 1905 
 Jan. 3 
 Feb. 14 
 Mar. 24 
 Apr. 4 
 30 
 May 31 
 June 22 
 26 
 July 26 
 Aug 6 
 
 9 
 28 
 Sept. 23 
 Oct. i 
 20 
 
 21 
 
 Nov. 1 8 
 
 8 
 
 9 
 10 
 8 
 '3 
 
 7 
 9 
 
 II 
 
 9 
 
 8 
 
 10 
 10 
 
 r2 
 
 7 
 '7 
 '7 
 16 
 
 '5 
 10 
 10 
 ii 
 
 9 
 10 
 
 9 
 9 
 7 
 10 
 
 7 
 9 
 6 
 
 2410000+ 
 6047 . 58 
 6054 . 63 
 6057.67 
 6084 . 58 
 6110.79 
 
 6399.54 
 6401 .63 
 
 6693.71 
 6696 . 63 
 6720.58 
 
 6748.67 
 
 6760.67 
 6782. 
 6815.75 
 
 6849.54 
 6891 . 96 
 6929.96 
 6940.92 
 6966.88 
 6997.67 
 7019.67 
 "023.71 
 
 7053-63 
 7064.67 
 7067.63 
 7086.63 
 
 7"2.54 
 7120.67 
 
 7'39 54 
 7140.63 
 7168.50 
 
 237 
 237 
 237 
 
 237 
 150 
 
 So 
 
 'SO 
 67 
 '50 
 
 237 
 67 
 40 
 
 237 
 250 
 40 
 237 
 '50 
 '50 
 '50 
 80 
 150 
 237 
 150 
 150 
 237 
 237 
 So 
 
 237 
 237 
 
 40 
 40 
 40 
 
 24 
 40 
 
 6 
 
 12 
 
 6 
 
 12 
 
 6 
 
 24 
 40 
 
 12 
 
 6 
 
 40 
 40 
 6 
 40 
 6 
 6 
 6 
 
 12 
 
 6 
 40 
 6 
 6 
 40 
 40 
 
 12 
 4 
 40 
 
 photometer . ... 
 
 
 
 "73 
 11.85 
 11.49 
 
 IO.O 
 
 8.75 
 
 12. 6 
 
 12. 7 
 
 <'3- 
 
 13- 2 
 <I2. 3 
 
 <'3-2 
 
 '3-6 
 
 <I2.2 
 <I2.2 
 
 12.57 
 
 11.27 
 9 50 
 8.75 
 9-'7 
 10.23 
 
 11.25 
 11.50 
 11-57 
 11.80 
 12.25 
 12.38 
 12-73 
 13." 
 
 <I2.8 
 
 13.57 
 13.37 
 
 good 
 fair 
 fair 
 
 289 
 206 
 300 
 
 -0.07 
 + 0.26 
 + O.O2 
 
 S$V pi 2V, TJ2W 
 
 20. 6, 20.9, 20.4. . . . 
 
 20. 6 
 
 photometer 
 
 photograph 
 
 
 
 wi ... . 
 
 
 43. 
 
 >5- 
 '4- 
 
 <io.5 
 
 10. 
 
 <'7- 
 
 <IO. 
 
 7 
 <i8 
 <i8 
 
 15-0 
 
 24.9 
 37-6 
 
 43-o 
 40.0 
 
 32-3 
 24.9 
 
 23-1 
 22.4 
 20.9 
 
 '7-4 
 16.4 
 
 13-7 
 10.5 
 
 <'3-4 
 7-5 
 8-5 
 
 fair 
 
 .good 
 fair 
 
 moon 
 good 
 moon 
 
 moon 
 
 dull 
 good 
 good 
 
 fair 
 good 
 fair 
 
 353 
 
 231 
 233 
 
 "9 
 '83 
 
 272 
 315 
 
 -0.31 
 
 o. 19 
 -0.03 
 
 + 0.68 
 -0.27 
 
 +0.47 
 + 0.47 
 
 v glimpsed, n$ $v 
 
 
 v glimpsed, ft4~5" 
 
 
 TJ not seen, limit u. . 
 
 
 iisv, vix 
 v not seen limit i 2<w 
 
 5-5, '4-5 
 
 (photographs, i> not seen, 
 1 limit 2 <w 
 
 i 
 
 i 
 
 vy, 11 certainly fainter thanie 
 v not seen limit n 
 
 
 v not seen limit n 
 
 
 n6v, vyc, vGw 
 d6v, v6n, vs, v$p 
 
 12.4, 16.5, 16.0 
 25.3, 2-4.4, 24.6, 25.4 
 38.0, 37.2 
 
 we, vib 
 va 
 
 ay> 
 
 
 poor 
 fair 
 good 
 good 
 fair 
 good 
 fair 
 fair 
 good 
 fair 
 
 389 
 ii 
 
 33 
 37 
 67 
 78 
 81 
 
 100 
 
 126 
 
 '34 
 
 o. 19 
 
 + 0.43 
 + I.H 
 + 1.29 
 + 0.70 
 + 0.66 
 + 1-03 
 + 0.52 
 
 O.O2 
 + 0.19 
 
 bio I2vi vo id 
 
 (2S) ^2 3 
 
 d6T, SIT, "v^p Tj6n . 
 
 25-3- 23.6, 26.4, 24.4 
 22.6, 24.4, 22.4 
 
 S2V, T!2p, Z/4l 
 
 r/>, near limit. 
 
 d$v, vin, piv 
 
 n^V. bAV . . 
 
 26.3, 19.4, 21.4 
 I C 4. IO A . 
 
 n2V, limit 3 < w 
 
 
 vx, V4W 
 
 XJ^V "VIV 
 
 13.5, 14.0 
 
 9c T j o 
 
 v not seen limit 5 <C n 
 
 
 x6v, iv 3-41% wi-2y 
 
 W2V, TI2y 
 
 7.5,6.5, 8.5 
 
 8.0, 9.0 
 
 good 
 good 
 
 154 
 182 
 
 + 0.33 
 + O.O7 
 
142 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 6 > 
 
 
 
 
 
 ft, 
 
 0,10 
 ?>9 
 
 O 
 
 o 
 
 o 
 
 
 
 0> 
 
 o> 
 
 1 
 
 FIG. 29. LIGHT-CURVE OF SX CYGNI. 
 
CHAPTER X. SX CYGNI. 143 
 
 TABLE 87. 7269 SX CYGNI. MEAN MAGNITUDES FROM 34.1 DAY GROUPS. 
 
 Group No. . . . 
 I D 
 
 i 
 -14. i 
 
 2 
 
 68 2 
 
 3 
 102 3 
 
 4 
 
 5 
 
 6 
 
 212 6 
 
 7 
 
 ^8 7 
 
 8 
 272 8 
 
 9 
 
 10 
 
 ii 
 
 12 
 
 
 
 
 
 
 
 
 
 
 
 
 
 409. 2 
 
 r t 
 
 J M 
 4940 4 m 
 
 L No. 
 
 r < 
 
 12 
 
 9-73 
 o. 10 
 
 7 
 
 10 
 
 43 
 10.30 
 -0.03 
 4 
 
 34 
 
 75 
 10.79 
 0.23 
 3 
 
 104 
 11.98 
 0.04 
 
 i 
 
 153 
 12.96 
 o. 16 
 3 
 
 185 
 I3-24 
 O.O4 
 
 3 
 
 224 
 
 12.95 
 + 0.05 
 
 3 
 
 250 
 12.39 
 
 0. 12 
 
 2 
 
 293 
 H.52 
 O.O4 
 
 4 
 
 324 
 10.04 
 
 O. 12 
 
 4 
 
 -J.1O 
 
 363 
 9.37 
 4-0.30 
 i 
 
 39 
 9.68 
 4-0.32 
 2 
 
 j M 
 
 10.42 
 
 ii .20 
 
 
 
 
 
 
 
 
 8 66 
 
 
 
 5349 \ m 
 
 + 0.64 
 
 + 0.95 
 
 
 
 
 
 
 
 
 o 56 
 
 
 
 I No. 
 
 2 
 
 i 
 
 
 
 
 
 
 
 
 
 
 
 r t 
 
 
 
 80 
 
 
 
 
 
 
 20=; 
 
 
 153 
 
 
 M 
 
 
 
 II 43 
 
 
 
 
 
 
 
 
 8 7 1 ; 
 
 
 5758 \ JM 
 
 
 
 + o 23 
 
 
 
 
 
 
 
 
 O ^1 
 
 
 L No. 
 
 
 
 I 
 
 
 
 
 
 
 
 
 
 
 r t 
 
 
 
 
 
 
 
 212 
 
 
 
 
 
 
 M 
 
 
 
 
 
 
 
 12 6^ 
 
 
 
 
 
 
 6l6 M JM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 [ No. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r < 
 
 
 
 
 1 19 
 
 
 183 
 
 
 272 
 
 
 71 C 
 
 
 
 M 
 
 
 
 
 13. 2 
 
 
 13 6 
 
 
 12 ^7 
 
 
 II 27 
 
 
 
 6 577 1 JM 
 
 
 
 
 + o 68 
 
 
 4-o 27 
 
 
 
 
 
 
 
 L No. 
 
 r 
 
 
 
 
 i 
 
 
 i 
 
 
 I 
 
 
 I 
 
 
 
 J M 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6986 j jM 
 
 
 
 
 
 
 
 
 
 
 
 
 
 L No. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r < 
 
 Means] ^ 
 I No. 
 
 12 
 9.88 
 O.OI 
 
 9 
 
 4i 
 10.48 
 + 0.16 
 5 
 
 76 
 10-95 
 O. 12 
 
 4 
 
 112 
 
 12-59 
 + 0.32 
 
 2 
 
 'S3 
 12.96 
 o. 16 
 3 
 
 184 
 
 13-33 
 4-0.04 
 
 4 
 
 227 
 12.83 
 
 O.OI 
 
 5 
 
 257 
 12.45 
 + 0.08 
 
 3 
 
 297 
 
 n-59 
 
 f O.OI 
 
 7 
 
 324 
 
 1O.OI 
 
 0.09 
 6 
 
 358 
 
 9.06 
 o.oo 
 
 2 
 
 390 
 
 9-53 
 4-0.16 
 
 3 
 
 100 
 
 DAYS 
 ZOO 
 
 30O 
 
 10 
 
 // 
 
 14- 
 
 500 
 
 7Z69 SX CYGNI 
 
 Min. IQO<* 
 M-m-l73 cl 
 
 FIG. 30. MBAN LIGHT-CURVE OF SX CYGNI. 
 
144 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 88. 7269 SX CYGNI. OBSERVED MAXIMA AND MINIMA. 
 
 Elements of maximum. 1900 Oct. 2 (J. D. 241S295) + 409d E. M-ra=173 1 '. 
 
 MAXIMA. 
 
 MINIMA. 
 
 I 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 1 
 w 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 o 
 i 
 
 2 
 
 3 
 4 
 
 1900 Oct. 2 
 1901 Nov. i 
 1903 Jan. 5 
 1904 Feb. 19 
 1905 Apr. ii 
 
 5295 
 5690 
 6120 
 6530 
 6947 
 
 9 23 
 8.8 
 8.8 
 
 8.90 
 
 9.58 
 9.1 
 
 9-2 
 
 me 
 9-25 
 
 o 
 
 -'4 
 + 7 
 + 8 
 4-i6 
 
 20 
 
 2 
 I 
 
 
 '7 
 
 o 
 
 i 
 
 2 
 
 3 
 
 4 
 
 1900 Apr. 1 6 
 1901 May 15 
 1902 July 9 
 1903 Aug. 23 
 1904 Oct. 7 
 
 5126 
 5520 
 5940 
 635f> 
 6761 
 
 '3-30 
 
 13 65 
 me 
 me 
 me 
 13-95 
 
 + 4 
 ii 
 o 
 
 + i 
 + 3 
 
 33 
 i 
 
 7 
 
 2 
 
 7 
 
 
 
 13.60 
 
 The last observation used in forming the mean light -curve was that of 1905 
 February 14, giving the elements at the head of Table 88. The maximum of 1905 
 April 1 1 indicates a slightly longer period, about 410 days. The magnitude at 
 maximum ranges from 8.5 to 9.2 on the Harvard scale, the minimum about 13.5. 
 
CHAPTER XI. 
 
 7458 V DELPHINI. 
 R. A. 2oh 4301 133.6; Dec. + 18 58' 01" (1900). 
 
 The discovery of the variability of this star, from the bright hydrogen lines 
 in its spectrum, was made by Mrs. Fleming at the Harvard College Observatory 
 in December, 1890. The announcement of the discovery made in the Astrono- 
 mische Nachrichten 127, 5, gave the Right Ascension for 1900 as 2o h 41.3 
 instead of 43.1"'. The other published notes which have come to the writer's 
 attention concerning this star are as follows: 
 
 Hartwig Astronomische Nachrichten, 134, 180, 307, 1894. 
 
 H. M. Parkhurst Astronomical Journal, 13, 192, 1894; IS, 20, 1895; 17,65, 1896; 
 
 21, 9, 190x3; 23, 81, 1903. 
 W. M. Reed ... .^ ... .Astronomical Journal 13, 63, 1893. 
 
 Yendell Ibid., 13, 176, 195, 1893; 17, 79, 1896. 
 
 J. A. Parkhurst Ibid., 16, 178, 1896; 17, 102, 397, 1897; 19, 69, 1899. 
 
 Astrophysical Journal, 12, 53, 190x3; 14, 176, 1901. 
 
 Visual observations began in June, 1894, with the 6-inch reflector, which 
 was supplemented during the summer of 1898 by the 1 2-inch refractor, and 
 after March, 1900, by the 4O-inch refractor. The magnitudes of the comparison 
 stars were measured with the equalizing wedge photometer attached to each of 
 the telescopes, connection being made with the three fundamental stars from 
 the Harvard and Potsdam catalogues with the 6-inch, and carried to the fainter 
 stars with the 12- and 4o-inch. Photographs of the field were made with the 
 24-inch reflector, insuring the correct identification of the comparison stars, and 
 furnishing a check on their coordinates from the variable, which were measured 
 with the micrometer on the 6- and 4o-inch. 
 
 POSITION OF THE VARIABLE. 
 
 The variable was connected with the micrometer on two nights, 1 896 October 
 24 and 26, with the star x, which is B. D. -( 1 8 46 19, and whose place from the 
 Berlin A. G. Catalogue is: 
 
 
 R. A. 
 
 Dec. 
 
 Year. 
 
 Berlin A G Catalogue 8389. . . 
 
 h m s 
 
 / # 
 
 -f- 1 8 50 21 2 
 
 i8?<; 
 
 Precession for 25 years 
 
 + I O8 12 
 
 + e 2A 6 
 
 
 Berlin A G Catalogue 8389 
 
 
 J- i ec AC S 
 
 
 Difference variable minus x 
 
 
 
 
 Place of variable 
 
 20 d. 1 1^6 
 
 -f 1 8 58 oo 8 
 
 IQOO 
 
 
 
 
 
 This is in close agreement with the place found by Hartwig from heliometer 
 measures, published in the Astronomische Nachrichten, 134, 307. 
 
 145 
 
146 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 THE CHART. 
 
 Plate 1 1 shows the field around the variable on a scale of i3/'8tothe millimeter. 
 It is a six-fold enlargement from a negative taken 1902 September 7, exposed 
 from 9 h 17 to io u 25, Central Standard Time, with the 24-inch reflector. 
 The negative shows the star A, 16.3 magnitude, distinctly. The photographic 
 magnitude of the variable on this plate is 10.4, which is 0.6 fainter than the visual 
 brightness as given by the light-curve, fig. 32. This difference corresponds 
 approximately to a color of 4 on Chandler's scale. 
 
 TABLE 89. 7458 V DELPHINI. STANDARD MAGNITUDE STARS. 
 
 
 
 1900. 
 
 
 Magnitude. 
 
 Residuals. 
 
 Star. 
 
 B. D. No. 
 
 R A 
 
 Dec 
 
 Color 
 P. DM. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nights 
 
 
 
 
 
 
 H.C.O. 
 
 RDM. 
 
 H. 
 
 P. 
 
 H. 
 
 p 
 
 inter 
 
 
 
 
 
 
 
 
 
 
 
 
 se. 
 
 
 
 
 h m s 
 
 / 
 
 
 
 
 
 
 
 
 
 /' 
 
 + 19 4501 
 
 20 40 17 
 
 + 20 07.9 
 
 G\V 
 
 7.07 
 
 7. ii 
 
 7.02 
 
 7.28 
 
 - 5 
 
 + 17 
 
 4 
 
 G 
 
 + 19 4544 
 
 20 47 50 
 
 + 19 45-4 
 
 GW 
 
 7.22 
 
 7-95 
 
 7-55 
 
 7.81 
 
 + 33 
 
 -14 
 
 2 
 
 K 
 
 + '9 4555 
 
 20 49 38 
 
 + 19 22.7 
 
 WG 
 
 7.40 
 
 7.40 
 
 /" 
 
 7-37 
 
 -29 
 
 - 3 
 
 4 
 
 
 Mean 
 
 
 
 
 7-23 
 
 7-49 
 
 7-23 
 
 7-49 
 
 22 
 
 n 
 
 3 
 
 
 i 
 
 
 THE COMPARISON STARS. 
 
 The data for the comparison stars are collected in Tables 89, 90, and 91, 
 which are sufficiently explained by the headings of the columns. The difference 
 between the mean magnitudes of the three fundamental stars in the Harvard 
 and Potsdam catalogues, 0.26, is larger than usual, which seems to be due to the 
 Harvard magnitude for the star G being 0.3 or 0.4 too small. The mean of three 
 measures in October, 1883, is given as 6.91 in Harvard Annals, 24. The mean 
 of three measures in September, 1894, is given as 7.52 in Volume 44 of the same 
 Annals. Whether this difference is due to error in the first set of measures or to 
 a change in the star itself remains unexplained. 
 
 TABLE 90. 7458 V DELPHINI. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 I855- 
 
 
 
 
 
 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 o 
 
 
 h m s 
 
 / 
 
 
 o 
 
 
 /; m s 
 
 / 
 
 
 
 4-18 4602 
 
 8.2 
 
 20 37 56 
 
 + 18 59-3 
 
 n' 
 
 + 18 4617 
 
 9.2 
 
 20 40 26 
 
 4-18 39.7 
 
 ( 
 
 + 19 4500 
 
 8.0 
 
 20 38 14 
 
 + 19 M. J 
 
 m' 
 
 4-18 4618 
 
 9.0 
 
 20 40 29 
 
 4-i8 43.2 
 
 ft 
 
 + 18 4611 
 
 8.8 
 
 2O 40 2 
 
 + 18 43.9 
 
 X 
 
 + 18 4619 
 
 8.9 
 
 20 40 31 
 
 4-iS 45.6 
 
 n 
 
 + 18 4614 
 
 9.1 
 
 2O 40 13 
 
 + 18 55-5 
 
 k 
 
 + '9 45'3 
 
 94 
 
 20 40 43 
 
 + 19 2.0 
 
 
 
 
 
 
 
 
 
 i 
 
STELLAR PHOTOMETRY. 
 + 30S 
 
 N 
 o 
 
 PLATE 11 
 
 -30' 
 
 ... 
 
 . 
 
 
 
 111 
 
 It- 
 
 . . v rt a 
 
 b * 
 
 Jx p . ' 
 
 f^' 
 . *V* 
 
 x 
 
 * 
 
 1- 20' 
 
 +10' 
 
 10' 
 
 ," "I ;mm = 1 3". S. 
 
 1902 September 7. 
 
 7458 V DH 
 R. A. 20 h 4310 i;, s .6. Der. +18- 58' i", 1900. 
 
CHAPTER XI. V DELPHINI. 
 
 147 
 
 TABLE 91. COMPARISON STARS FOR V DELPHINI (IN ORDER OF RIGHT ASCENSION). 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H. 
 
 p 
 
 
 It 
 
 s 
 
 1 
 
 
 
 j 
 
 t 
 
 -984 
 
 - 69-4 
 
 - 30.5 
 
 9. 10 
 
 9-3^ 
 
 
 
 n 
 
 -768 
 
 - 54-' 
 
 4- 461 
 
 42.8 
 
 
 
 9.87 
 
 10.13 
 
 n' 
 
 640 
 
 - 45-i 
 
 - 5'5 
 
 
 9.82 
 
 10. 08 
 
 
 
 m' 
 
 -584 
 
 - 41.2 
 
 - 34 
 
 
 9.78 
 
 10.04 
 
 
 
 X 
 
 -575 
 
 - 40-5 
 
 - 135 
 
 46.4 
 
 9.29 
 
 9-55 
 
 
 
 k 
 
 -391 
 
 - 27.6 
 
 4- 696 
 
 40. 2 
 
 
 
 10.28 
 
 10-54 
 
 d 
 
 -336 
 
 - 23-6 
 
 - 28 
 
 33-5 
 
 1 1 . 05 
 
 11.31 
 
 
 
 I 
 
 -313 
 
 22.0 
 
 - 289 
 
 36.6 
 
 1 1 . 63 
 
 11.89 
 
 
 
 c 
 
 280 
 
 - '9-7 
 
 4- 96 
 
 3-9 
 
 11.31 
 
 "-57 
 
 
 
 m 
 
 -194 
 
 - '3-7 
 
 4- 890 
 
 40.9 
 
 
 
 10. 17 
 
 10.43 
 
 i 
 
 -164 
 
 - 11-5 
 
 + 149 
 
 34-5 
 
 1 1 .04 
 
 11.30 
 
 
 
 a 
 
 -117 
 
 - 8. 3 
 
 4- 48 
 
 27.6 
 
 12.13 
 
 12-39 
 
 
 
 K 
 
 -107 
 
 - 7-5 
 
 - 285 
 
 36-4 
 
 10.95 
 
 II . 21 
 
 
 
 to' 
 
 - 76 
 
 5-4 
 
 - 92 
 
 
 '4-3 
 
 I 4 .6 
 
 
 
 HI 
 
 - 56 
 
 - 3-7 
 
 - 107 
 
 
 13-73 
 
 '3 99 
 
 
 
 (> 
 
 - 45 
 
 - 3-2 
 
 - 7' 
 
 4-5 
 
 '4-7 
 
 15-0 
 
 
 
 V 
 
 - 29 
 
 2.O 
 
 42 
 
 3-5 
 
 I5-I3 
 
 15-39 
 
 
 
 A 
 
 20 
 
 I .4 
 
 c 
 
 
 
 
 l6.2 
 
 16 * 4- 
 
 n 
 
 - 4 
 
 ~ 0.3 
 
 - 152 
 
 14- 
 
 14. I 
 
 14.4 
 
 
 1 *' o -C 
 
 !> 
 
 4- 6 
 
 4- 0.4 
 
 12 
 
 2. 
 
 I5-32 
 
 15-5S 
 
 
 
 <T' 
 
 + 17 
 
 + 1-4 
 
 - 157 
 
 
 14.4 
 
 U-7 
 
 
 
 
 
 + 48 
 
 + 3-3 
 
 + 39 
 
 4- 
 
 '5-2 
 
 15-5 
 
 
 
 - 
 
 + 103 
 
 4- 7.2 
 
 - 164 
 
 16. 
 
 13.6 
 
 13-9 
 
 
 
 V 
 
 + 104 
 
 + 7-3 
 
 4- 4' 
 
 20. 
 
 13-50 
 
 13-76 
 
 
 
 
 'h 
 
 + 190 
 
 + '3-5 
 
 + 45 
 
 30.8 
 
 
 
 11.63 
 
 11.89 
 
 b 
 
 + 202 
 
 + '4-3 
 
 - 8 
 
 28.8 
 
 
 
 11.94 
 
 I 2. 2O 
 
 e 
 
 + 232 
 
 4- 16.4 
 
 - 64 
 
 33-2 
 
 
 
 II . 30 
 
 II.S6 
 
 s 
 
 
 -195- 
 
 4- 660 
 
 55-2 
 
 
 
 7.81 
 
 8.1 
 
 f 
 \ 
 
 
 -178. 
 
 4-1380 
 
 56.3 
 
 
 
 7-7 
 
 8.0 
 
 Table 92 gives the determination of the magnitude of the stars m', n', x, and 
 5, based on the fundamental stars F, G, and K. No correction has been made 
 for change of atmospheric absorption depending on difference of zenith distance 
 between the fundamental and measured stars, as it amounted to only 0.002 mag. 
 Table 92 also gives the measures of a, c, d, j, g, and /, with the 1 2-inch and the 
 fainter stars with the 40- inch. 
 
 In Table 94 the separate results are collected and the mean magnitudes 
 found. The residuals for each night's measures are given in the column headed 
 4 the mean values being 
 
 With the 6-inch 0.08 
 
 With the 12-inch 0.05 
 
 With the 40-inch o. 1 2 
 
 VISUAL COMPARISONS OP THE VARIABLE. 
 
 Table 95 gives in detail the visual comparisons of the variable by Argelander's 
 method with the comparison stars thus determined. There are also included 
 for comparison the photometric measures of the variable in observations Nos. 
 112 and 115, and estimates from the photograph, Nos. 114 and 123. 
 
148 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 92. -7458 V DELPHINI. PHOTOMETER MEASURES OF COMPARISON STARS. 
 
 1903 October 22. 6-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 c. 
 
 Magnitude 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 21 6 
 31 32 
 
 
 
 25 
 25 
 25 
 26 
 
 26 
 26 
 
 F 
 G 
 K 
 
 X 
 
 m' 
 n' 
 K 
 
 S 
 n' 
 m,' 
 
 X 
 
 K 
 G 
 
 F 
 
 12.9 12.8 12.8 
 17.6 16.8 16.9 
 J3-5 13-6 13.7 
 32-5 32-7 32-8 
 36.6 36.8 37.0 
 36.5 36.1 36.0 
 32.7 32.0 32.1 
 50.2 50.7 50.2 
 31.9 32.1 31.0 
 35-2 35-4 35-0 
 36.1 36.2 35.4 
 33-2 33-o 33-2 
 >3-4 '3-9 13 6 
 17.1 17.4 17.0 
 12.5 12.3 12.4 
 
 12.83 
 17. 10 
 13.60 
 32.67 
 36.80 
 36.20 
 32-27 
 50.37 
 31-67 
 35-20 
 35-90 
 33-13 
 13-63 
 17.17 
 12.40 
 
 12.62 
 17.14 
 13.62 
 32.90 
 36.35 
 35-70 
 3i 97 
 
 0.59 
 1-25 
 0.74 
 3.04 
 3.50 
 3.42 
 2.92 
 
 4-73 
 
 6.96 
 7.62 
 7.11 
 9.41 
 9.87 
 9-79 
 9 29 
 
 II . IO 
 
 7.22 
 
 7.88 
 
 7-37 
 9.67 
 10.13 
 10.05 
 9-55 
 ii .36 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 IQ03 October 23. Good. 
 
 21 4 
 
 21 24 
 
 26 
 
 27 
 
 d 
 n' 
 m' 
 
 X 
 
 K 
 G 
 F 
 F 
 G 
 K 
 x 
 m' 
 n' 
 S 
 
 28.6 28.8 28.9 
 32.1 32.7 32.6 
 33.1 32-9 33 3 
 3i-3 31-4 3I.5 
 12.5 12.3 12. i 
 
 '5-9 15-3 IS-? 
 12. i ii .8 ii. 8 
 10.7 i I. i 10.4 
 15.1 15.2 15.5 
 
 II.5 12. I 12.3 
 
 28.9 29.9 29.0 
 
 31-7 32.7 32.5 
 32.0 32.2 32.3 
 31.0 30.2 30.8 
 
 28.77 
 
 32-47 
 33-10 
 3I-40 
 12.30 
 15 63 
 11.90 
 10-73 
 15-27 
 H-97 
 29.27 
 
 32-30 
 32-17 
 30.67 
 
 29.72 
 32-32 
 32.70 
 
 30.34 
 
 12. 14 
 
 15-45 
 11.82 
 
 2.66 
 2.97 
 3 oi 
 
 2. 72 
 0.52 
 
 o 99 
 o.49 
 
 9. 22 
 9-53 
 
 9-57 
 9.28 
 7.08 
 7-55 
 7-05 
 
 9.48 
 9-79 
 9.83 
 9-54 
 7-34 
 7.81 
 
 7-31 
 
 1903 October 24. Good, small moon. 
 
 20 47 
 
 21 8 
 
 23 
 24 
 
 25 
 
 24 
 
 F 
 
 IF;; 
 
 G 
 
 K 
 
 X 
 
 m' 
 n' 
 3 
 d 
 n' 
 m' 
 
 X 
 
 K 
 G 
 F 
 F . 
 
 10. 7 10. 7 1 1 .0 
 15.7 16.0 16.6 
 
 13-9 14.4 13-7 
 ii .6 12. i 11.7 
 
 30.5 30.7 30.1 
 31.6 31.7 32.1 
 32.2 32.0 32.0 
 30.2 29.2 29.7 
 30.6 30.1 30.1 
 32.1 31.7 31.3 
 32.2 32.0 32.4 
 30.5 31.0 31.2 
 11.3 11.5 11.3 
 14.4 14.3 13.4 
 
 10.6 10.7 10.7 
 17.2 17.4 17.1 
 
 10.80 
 16. 10 
 14.00 
 ii .80 
 
 30 43 
 31.80 
 32-07 
 29.70 
 30.27 
 31-70 
 32.20 
 30.90 
 
 11-37 
 14 03 
 10.67 
 17-23 
 
 10.74 
 16.67 
 14.02 
 
 11-59 
 30.67 
 32.00 
 
 31.89 
 29.99 
 
 0.28 
 1.17 
 0.80 
 0.46 
 2.76 
 2.94 
 2.91 
 2.68 
 
 6 97 
 7-86 
 
 7-49 
 7-15 
 9 45 
 9 63 
 9.60 
 9-37 
 
 7-23 
 
 8.12 
 
 7-75 
 7.41 
 
 9-71 
 9.89 
 9.86 
 9-63 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER XI. V DELPHINI. 
 
 149 
 
 TABLE 92. 7458 V DELPHIM. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1903 October 25. 12-INCH. Fair to good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 A m 
 23 >5 
 
 23 45 
 
 o 
 
 40 
 
 45 
 
 X 
 
 m' 
 n' 
 d 
 I 
 
 S 
 
 a 
 
 f 
 c 
 d 
 
 f 
 a 
 
 S 
 <5 
 n' 
 m' 
 .r 
 
 21 .0 21.8 21.3 
 24.9 25.8 25.2 
 27.4 28.2 27.9 
 
 19.8 20. I 2O.3 
 
 43-3 44-o 44.5 
 38.0 37.7 38.1 
 49-9 50.2 49.0 
 38.8 37.9 38.0 
 40.0 39.3 39.2 
 38.7 37-7 38.2 
 39 4 39-o 39 o 
 49.1 50.0 49.9 
 38.2 38.0 37.8 
 
 2O. I 19.7 20. O 
 26.9 27.0 27.0 
 28.2 27.7 27.3 
 21.9 23.0 22.3 
 
 21.37 
 25-30 
 27-83 
 20.87 
 
 43 93 
 37-93 
 49.70 
 
 38-23 
 39 50 
 38.20 
 
 39.13 
 49.67 
 38.00 
 
 19 93 
 26.97 
 
 27-73 
 22.40 
 
 21.89 
 26.52 
 27.40 
 20.00 
 
 1.91 
 
 2-33 
 2.40 
 1.71 
 4. 20 
 3 54 
 4-77 
 3.62 
 
 3-72 
 3-57 
 
 9-32 
 
 9-74 
 9.81 
 9.12 
 ii .61 
 10-95 
 12. 18 
 11.03 
 
 11.13 
 10.98 
 
 9.58 
 
 10.00 
 
 10.07 
 
 9-38 
 
 11.87 
 
 II. 21 
 12.44 
 11.29 
 
 u-39 
 11.24 
 
 37-97 
 49.69 
 38.68 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1903 October 26. Good, moon. 
 
 21 3 
 
 21 31 
 
 24 
 26 
 
 (5 
 n' 
 m' 
 
 X 
 
 d 
 c 
 
 / 
 a 
 
 g 
 
 J 
 
 g 
 a 
 
 / 
 c 
 d 
 
 X 
 
 m' 
 n' 
 S 
 
 18.2 18.7 19.0 
 
 24.6 25.3 24.9 
 25.0 26.0 25.4 
 
 2O. I 19.9 20. I 
 38-3 38-3 38.8 
 4O.8 40.7 40.9 
 
 37-2 37-o 37.2 
 46. 7 48.0 47. i 
 36.7 37-6 37.0 
 41 . i 42.0 41 .0 
 41 .6 41.9 42. i 
 
 37-4 35-4 36.4 
 46.7 47.8 47.3 
 36.9 36.0 36.6 
 40.2 40.0 39. i 
 36.8 36.3 36.4 
 19.8 19.3 19.9 
 24.7 24.2 24.7 
 23.7 23.6 23.7 
 18.2 18.3 18.5 
 
 18.63 
 24-93 
 25-47 
 20.03 
 
 38.47 
 40.80 
 
 37-'3 
 47-27 
 37-io 
 4'-37 
 41.87 
 36.40 
 47-27 
 36-50 
 39-77 
 36-50 
 19.67 
 
 24-53 
 23.67 
 
 18.33 
 
 18.48 
 24-30 
 25.00 
 19-85 
 37-49 
 40-29 
 36.82 
 47-2? 
 36.75 
 41 .62 
 
 i-50 
 2-15 
 
 2.20 
 
 1.68 
 
 3-48 
 3.80 
 3-40 
 
 4-55 
 3-40 
 3 96 
 
 9.12 
 
 9-77 
 9.82 
 9-30 
 
 II . IO 
 
 ii .42 
 1 1. 02 
 
 12. I? 
 II .02 
 11.58 
 
 9-38 
 10.03 
 10.08 
 9-56 
 11.36 
 11.68 
 11.28 
 
 12-43 
 11.28 
 11.84 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1903 November 10. Good. 
 
 21 38 
 22 2 
 
 26 
 29 
 
 S 
 n' 
 m' 
 
 X 
 
 d 
 c 
 
 f 
 a 
 
 g 
 
 g 
 a 
 
 / 
 c 
 d 
 
 X 
 
 m' 
 n' 
 S 
 
 '1.2 12. I 12.2 
 
 18.0 18.7 18.8 
 
 16.7 17.7 17.2 
 
 14-3 I3-I 13-8 
 30.8 30.9 31.8 
 
 33-8 34-o 33.3 
 30.8 30.0 30.1 
 4: . i 40.0 40.4 
 28.5 29.0 28.2 
 36.0 37.0 36.2 
 28.9 29.2 28.9 
 38.1 38.0 38.0 
 31.0 30.9 31.2 
 33-2 33-9 34 2 
 30.0 30.8 30.7 
 14 .3 14.3 14.3 
 18.7 19.0 18.6 
 19.0 18.6 19.1 
 12.2 13.8 13.1 
 
 11.83 
 18.50 
 17.20 
 '3-73 
 3'-i7 
 33-70 
 30-30 
 40.50 
 28.57 
 36.40 
 29.00 
 38.03 
 31-03 
 33-77 
 30-50 
 14.27 
 18.77 
 18.90 
 13-03 
 
 12.43 
 18.70 
 
 17-99 
 14.00 
 30.84 
 
 33-74 
 30.67 
 
 39-27 
 28.79 
 
 0.71 
 1-55 
 i-45 
 0.91 
 
 2-74 
 3-05 
 2.72 
 3-70 
 2-53 
 3-35 
 
 9 05 
 9-89 
 9-79 
 9-25 
 11.08 
 
 "39 
 n .06 
 12.04 
 10.87 
 ii .69 
 
 9-3 
 10. 15 
 10.05 
 9-51 
 u-34 
 11.65 
 11.32 
 12.30 
 11.13 
 "95 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
150 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 92. -7458 V DELPHINI. PHOTOMETER MEASURES OK COMPARISON STARS. Continued. 
 
 1900 July 26. 40-INCH, WEDGE II. Twilight- 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h in 
 
 O 
 
 d 
 c 
 
 i 
 
 a 
 V 
 "/ 
 
 S 
 a 
 
 t 
 c 
 d 
 
 18.5 18.3 18.3 18.8 
 
 23. 2 22 . 2 23. 2 22. 2 
 18.2 19.8 16.8 16.7 
 27.8 25. I 25.5 26.9 
 36.0 37.5 35.5 36.2 
 
 18.48 
 22.70 
 IS. 13 
 26 - 33 
 36 - 30 
 20.00 
 15-35 
 23-53 
 14-65 
 19-73 
 14.48 
 
 16.48 
 21.72 
 16.39 
 24 93 
 
 0.92 
 
 '77 
 0.91 
 2.23 
 3-52 
 15 
 0.72 
 
 10.84 
 ii .69 
 10.83 
 
 12. 15 
 
 13-44 
 II.4 
 10.6 
 
 II . 10 
 
 ii-95 
 I I .09 
 12.41 
 I3-70 
 
 ii-7 
 10.9 
 
 
 14 5 16 2 . . 
 
 
 22.5 23.9 22.8 24.9 
 
 13.2 14.8 14.9 15.7 
 19.8 20.9 19.9 18.3 
 14.2 15.0 13.9 14.8 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1900 August 30. 
 
 19 5 
 20 20 
 
 
 i 
 
 a 
 
 y 
 
 ft 
 c 
 f 
 i 
 / 
 ft 
 
 R 
 
 y 
 
 a 
 i 
 
 16.5 16.5 17.2 
 27.0 27.2 24.9 
 31.8 32.1 33.3 
 52.0 50.0 50.9 
 49-9 54-7 53-6 
 5'-i 52-3 51-9 
 46 . 8 
 
 16.73 
 26.37 
 32 . 4 
 50.97 
 
 52.73 
 51.77 
 46.8 
 
 37-13 
 51.80 
 
 51-43 
 50.80 
 
 34-17 
 21.97 
 
 '3-33 
 
 15 03 
 24-17 
 33-29 
 50.89 
 52.08 
 51-79 
 
 0.71 
 2-13 
 
 3-22 
 5-03 
 5-13 
 
 5-u 
 4-7 
 3-62 
 
 10.87 
 12.29 
 13-38 
 '5 19 
 15-29 
 15-27 
 4-9 
 13-78 
 
 11.13 
 12.55 
 13-64 
 15-45 
 15-55 
 15-53 
 15. i 
 14.04 
 
 36.1 38-5 36.8 
 53.0 50.2 52.2 
 
 50.3 50.9 53 i 
 50.9 49.8 51.7 
 33-3 35-2 34 o 
 23.2 20.9 21 .8 
 12.4 15.0 12.6 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1900 September 6. Moon too bright. 
 
 21 47 
 
 22 5 
 
 
 d 
 c 
 
 f 
 a 
 
 y 
 
 w 
 
 1.5.2 16.2 15.6 
 18.9 19.9 20 . I 
 16.0 12. o 14.4 
 
 22.0 24.2 25.7 
 
 37-9 34-3 35-o 
 38-9 39-6 37-7 
 
 15.67 
 19-63 
 1-4- 13 
 23-97 
 35-73 
 3 73 
 
 
 0.80 
 
 i-43 
 0.58 
 
 2. IO 
 3-46 
 
 3-79 
 
 10.95 
 11.58 
 10.73 
 12.25 
 13.61 
 13 94 
 
 II. 21 
 11.84 
 
 10.99 
 12.51 
 
 13-87 
 I4.2O 
 
 
 
 
 
 
 1900 September 13. Good. 
 
 22 22 
 
 22 57 
 
 
 d 
 
 c 
 
 } 
 
 a 
 
 y 
 
 IJL 
 f> 
 
 V 
 
 IU' 
 
 to 
 a 
 n' 
 
 y 
 
 a 
 / 
 
 / 
 c 
 d 
 
 16.5 15.1 15.9 
 19.2 18.2 17.8 
 12. o II. 8 12.3 
 
 25.0 25.9 23.4 
 
 35-2 35-7 32-5 
 52.1 52.0 51.9 
 
 47-5 46.9 47-8 
 41. o 
 
 15.83 
 18.40 
 12.03 
 24-77 
 34-47 
 52.00 
 47.40 
 
 15-7 
 18.09 
 12.88 
 24-39 
 
 34-32 
 
 0.80 
 
 I .21 
 
 0.40 
 2.16 
 3.32 
 
 5-12 
 
 4.75 
 4. 3d: 
 
 ii .04 
 
 "45 
 10.64 
 12.40 
 13-56 
 15-36 
 14-99 
 M-5 
 14- 3 
 13- 1 
 14. i 
 M-4 
 i3-9 
 
 I I . 3O 
 11.71 
 I0.9O 
 
 12.66 
 13.82 
 15.62 
 15-25 
 14- 
 M-6 
 13 4 
 i4-4 
 4-7 
 
 14- 2 
 
 
 
 
 34-17 
 24.00 
 
 1 1 - 33 
 13-73 
 17-77 
 15-57 
 
 
 4-i 
 
 2.9 
 
 3-9 
 
 4-2 
 
 3-7 
 
 10 * 
 
 ?Q 8 . 
 
 
 37 7 
 
 34-8 33-9 33-8 
 23.8 24.2 24.0 
 ii. o 11.9 ii . i 
 13.2 14.5 13.5 
 17. i 19.0 17.2 
 14 9 16.6 15.2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER XI. V DELPHINI. 
 
 151 
 
 TABLE 93. 7458 DELPHINI. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 1903 October 22. igo v 
 
 ( October 23. 1903 October 24. 
 
 St ar . Obs. Mag. J Mag. Obs 
 
 . Mag. J Mag. Obs. Mag. J Mag. 
 
 H. P. H. P. H. 
 
 P. H. P. H. P. H. P. 
 
 F . . o S9 6 96 722 1 1 + 1 1 o 49 7 o 
 
 5 7.31 .02 -f .20 0.36 6.97 7.23 .10 + . 12 
 
 5 7-8i + -33 - -H 0.80 7.49 7. 75 + . 27-. 20 
 8 7.34 .32 .06 0.46 7.15 7.41 .25 .01 
 
 G . i 25 7 62 7 88 + 41 06 0.99 7 5 
 
 K . ... o 74 7 ii 7 . 37 . 29 .03 0.52 7.0 
 
 
 Means.. 0.86 7.2-? 7. 49 .27 .07 0.67 7.2 
 M 6.37 6.63 6.5 
 
 3 7-49-22.i3 0.54 7.23 7.49 .21 .11 
 6 6.82 6 . 69 6 . 95 
 
 12-INCH. 
 
 40-INCH. 
 
 C. 
 
 o, Mag. 
 
 C. 
 ^ Mae. 
 
 n - Oct. 25. Oct. 26. Nov. 10. 
 
 "'July 26. Aug.3o.Sept.6.Sept.i3 
 
 m' 9-69 2 . 33 2 . 20 '-45 
 
 a 12.13 2.23 213 210 216 
 
 n f o 64. 2 4.0 21^ i ^s 
 
 
 x 9-38 i 91 i 68 o 91 
 
 d ..ii 05 o 92 . o 80 o 80 
 
 
 
 
 
 Mean C .... 2 09 i 88 i 16 
 
 
 Mean Mag. 9 . 50 9 . 50 9 . 50 9 . 50 
 
 M,, . 7417 62 8 "?4. 
 
 Mean Mag . n . 84 1 1 . 38 11.58 1 1 . 38 1 1 . 38 
 M . . 9 92 10 16 10 15 10 24 
 
 
 
 MAGN 
 17 16 IS / 13 
 
 TUDE 
 t II IO 9 6 7 
 
 EEEEEEiEEEiEEEJEEEEijEEEiEEiEiiiEEEEEEEEjiiifE!!! 
 
 SO 
 
 q: ;: :t :i 
 
 7459 v DELPHI NI :; 
 
 4O 
 
 30 i 
 11 1 lllllll lllll 
 
 \rm\ I llP 
 
 IO - 
 O -*--! ' J "f"I" 
 
 i ^4- - - - " i 
 j.::i::::::::i:: :: 
 
 .</ 1 [ 1 1 1 1 1 1 1 1 1 i I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 . 1 1 1 1 1 1 1 1 1 1 1 1 1 
 
 - -H- -pr 
 
 i I 
 
 FIG. 31. MAGNITUDE-CURVE FOR V DELPHINI. 
 
152 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 94. 7458 V DELPHINI. MEAN MAGNITUDES OF COMPARISON STARS. 
 
 6-INCH. 
 
 Star. 
 
 October 22. 
 
 October 23. 
 
 October 24. 
 
 Mag. 
 
 A Mag. 
 
 Mean. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 d Mag. 
 
 Mag. 
 
 d Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 F ... 
 
 6.96 
 7.62 
 7.11 
 
 0.06 
 + 0.07 
 o.oo 
 
 7-05 
 7-55 
 7.08 
 
 + 0.03 
 o.oo 
 -0.03 
 
 7.04 
 7-49 
 7-i5 
 
 4-O.02 
 
 + 0.06 
 + 0.04 
 
 
 
 7.02 
 7-55 
 7 11 
 
 7.28 
 7-81 
 
 7-37 
 
 0.04 
 0.04 
 0.02 
 
 c, 
 
 
 
 K 
 
 
 
 Mean . 
 
 m' . ... 
 
 
 
 7-23 
 
 7-49 
 
 0.03 
 
 9-8? 
 9-79 
 9.41 
 9.29 
 
 4-0.18 
 + 0.15 
 +0.03 
 o.oo 
 
 9-57 
 9-53 
 9.28 
 9.22 
 
 O. 12 
 O.H 
 O. IO 
 0.07 
 
 9-63 
 9.60 
 
 9-45 
 9-37 
 
 0.06 
 0.04 
 + 0.07 
 + 0.08 
 
 
 
 9.69 
 9.64 
 9-38 
 9.29 
 
 9-95 
 9.90 
 9.64 
 9-55 
 
 O. 12 
 0. 10 
 0.07 
 0.05 
 
 n' 
 
 
 
 % 
 
 
 
 3 
 
 
 
 Mean. 
 
 
 
 9-50 
 
 9.76 
 
 0.07 
 
 
 
 
 
 
 
 
 
 12-INCH. 
 
 Star. 
 
 October 25. 
 
 October 26. 
 
 November 10. 
 
 Mag. 
 
 d Mag. 
 
 Mean. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 9.82 
 9-77 
 9-3 
 9.12 
 
 d Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 d Mag. 
 
 m' . ... 
 
 9-74 
 9.81 
 9-32 
 9.12 
 
 0.04 
 
 O.OI 
 
 +0.03 
 
 + O.O2 
 
 + 0.04 
 -0.05 
 
 + O.OI 
 + O.O2 
 
 9-79 
 9.89 
 
 9-25 
 9-5 
 
 + O.OI 
 
 + 0.07 
 0.04 
 -0.05 
 
 
 
 9.78 
 9.82 
 9.29 
 9. 10 
 
 10.04 
 10.08 
 9-55 
 
 <) S<> 
 
 0.03 
 0.04 
 0.03 
 0.03 
 
 n' 
 
 
 
 % 
 
 
 
 ft 
 
 
 
 Mean . 
 a 
 
 9-50 
 
 9.76 
 
 0.03 
 
 12. 18 
 
 11.13 
 
 10.98 
 11.03 
 
 JO 95 
 ii .61 
 
 + 0.05 
 
 -0.18 
 0.07 
 
 O.OI 
 
 o.oo 
 
 O.O2 
 
 12. 17 
 ii .42 
 1 1 . i b 
 ii .02 
 ii .02 
 11.58 
 
 + 0.04 
 
 + O. II 
 
 + 0.05 
 
 O.02 
 
 + 0.07 
 0.05 
 
 12.04 
 
 "39 
 11.08 
 ii .06 
 10.87 
 ii .69 
 
 0.09 
 + 0.08 
 + 0.03 
 
 -f0.02 
 0.08 
 + O.O6 
 
 
 
 12.13 
 11.31 
 11.05 
 ii .04 
 
 10.95 
 11.63 
 
 12.39 
 ii-57 
 H-34 
 n-32 
 11-13 
 H-95 
 
 0.06 
 
 O. 12 
 
 0.05 
 0.02 
 0.05 
 0.04 
 
 c 
 
 
 
 d 
 
 
 
 f 
 
 
 
 
 
 
 
 
 
 Mean . 
 
 
 
 "35 
 
 ii. 61 
 
 0.06 
 
 
 
 
 
 
 
 
 
 40-INCH. 
 
 Star. 
 
 July 26. 
 
 August 30. 
 
 September 6. 
 
 September 13. 
 
 Mean. 
 
 Mag. 
 
 d Mag. 
 
 Mag. 
 
 d Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 d Mag. 
 
 * n 
 
 12.15 
 ii .69 
 10.84 
 10.83 
 
 0. 12 
 + O. 12 
 O. IO 
 4-0.06 
 
 12.29 
 10.87 
 
 + 0.02 
 4-O. IO 
 
 12.25 
 
 11.58 
 10.95 
 J0.73 
 
 O.O2 
 + O.OI 
 
 4-0.01 
 0.04 
 
 12.40 
 
 Ji-45 
 ii .04 
 10.64 
 
 4-0.13 
 4-o. 12 
 -f o. 10 
 -0.13 
 
 12.37 
 n-57 
 10.94 
 10.77 
 
 12.53 
 11.83 
 1 1. 20 
 ii 03 
 
 0.07 
 0.08 
 0.07 
 0.08 
 
 c . ... 
 
 d 
 
 f 
 
 Mean . 
 
 y 
 
 11.38 
 
 ii .64 
 
 0.08 
 
 13-44 
 
 O.O6 
 
 >3.38 
 i4-9 
 15-29 
 15 19 
 15-27 
 I3-78 
 
 O. 12 
 
 -0.03 
 
 13-61 
 
 + O. II 
 
 I3-56 
 
 14- 5 
 I5-36 
 
 + 0.06 
 + 0.04 
 
 13-50 
 
 H-7 
 15-32 
 
 15- 2 
 
 15-13 
 13-73 
 
 H-3 
 14. i 
 
 i4-4 
 
 13-76 
 15. o 
 15-58 
 i5-5 
 15-39 
 '3-99 
 14- 6 
 i4-4 
 i4-7 
 
 0.09 
 0.04 
 
 o. 14 
 
 f 
 
 ij. 
 
 
 
 It .... 
 
 
 
 /> 
 
 
 
 4-o. 14 
 +0.05 
 
 13-94 
 
 + O.2I 
 
 14.99 
 13- 1 
 14- 3 
 Id. I 4- 
 
 o. 14 
 
 
 
 
 ru' 
 
 
 
 
 
 
 
 
 
 
 > 
 
 
 
 
 
 
 
 i4-4 
 
 
 
 
 
 
 
 
 
CHAPTER XI. V DELPHINI. 
 
 TABLE 95. 7458 V DELPHINI. VISUAL OBSERVATIONS OP THE VARIABLE. 
 
 153 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 Aperture. 
 
 Comparisons. 
 
 V 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 /. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S.T 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 i 
 
 2 
 
 3 
 
 4 
 5 
 6 
 
 7 
 8 
 9 
 
 10 
 
 ii 
 
 12 
 
 '3 
 
 14 
 15 
 
 16 
 
 '7 
 18 
 
 19 
 
 20 
 21 
 22 
 23 
 
 24 
 
 25 
 26 
 
 27 
 
 28 
 
 29 
 30 
 31 
 
 32 
 
 33 
 34 
 
 35 
 36 
 
 37 
 38 
 39 
 
 40 
 
 4i 
 42 
 43 
 44 
 45 
 
 1894 
 June 28 
 
 30 
 July 6 
 
 23 
 Aug. 6 
 Nov. 20 
 Dec. 2 
 
 13 
 
 19 
 25 
 
 '895 
 Jan. 15 
 Feb. 21 
 
 May 26 
 
 June 13 
 26 
 July 9 
 '9 
 24 
 30 
 Aug. 12 
 
 25 
 26 
 
 Sept. 6 
 10 
 
 1896 
 Aug. 10 
 26 
 Sept. 23 
 Oct. 5 
 
 24 
 26 
 Nov. i 
 
 12 
 
 14 
 
 22 
 26 
 
 Dec. 2 
 9 
 
 12 
 2O 
 
 1897 
 
 Jan. 6 
 28 
 May 28 
 July 8 
 Aug. 27 
 Oct. 14 
 
 10 
 
 10 
 10 
 10 
 10 
 
 6 
 6 
 
 6 
 
 6 
 6 
 
 6 
 10 
 
 IO 
 10 
 
 9 
 9 
 9 
 9 
 9 
 8 
 
 9 
 
 8 
 8 
 
 9 
 8 
 
 8 
 6 
 
 8 
 8 
 
 7 
 6 
 6 
 
 8 
 8 
 
 6 
 
 7 
 7 
 
 6 
 6 
 
 IO 
 9 
 9 
 
 7 
 
 2410000 + 
 3008.67 
 
 3010.67 
 3016.67 
 
 3033-67 
 3047.67 
 
 3i53 50 
 31*5.30 
 
 3176 50 
 
 3182.50 
 3188.50 
 
 3209.50 
 3246. 
 
 3340.67 
 
 3358.67 
 3371-67 
 3384.63 
 3394.63 
 3399.63 
 3405 63 
 3418.60 
 343L58 
 3432-63 
 3443.58 
 3447.58 
 
 3782.63 
 3798.58 
 3826. 
 3838.58 
 3857-50 
 3859-58 
 3865 . 58 
 
 3876 . 54 -J 
 3878.50 
 3886. 50 | 
 
 3890.58 
 3896.58 
 
 3903-5o{ 
 3906.54 
 39I4- 54 { 
 
 393".50 
 3953-50 
 4073.67 
 4114.63 
 4164.63 
 4212.54 
 
 150 
 
 150 
 150 
 150 
 150 
 150 
 '50 
 
 150 
 
 150 
 150 
 
 150 
 150 
 
 150 
 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 '50 
 150 
 40 
 
 150 
 150 
 80 
 150 
 80 
 80 
 150 
 150 
 40 
 150 
 15 
 40 
 40 
 40 
 150 
 40 
 80 
 150 
 40 
 
 '50 
 150 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 6 
 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 
 fgi/, }2g, ec, eid, d^b 
 
 I 
 
 
 <I2 
 
 <I2 
 <I2 
 
 <I2 
 
 
 
 
 (C2a, ti2b, eT,h, limit Ka 
 e^h, Ii2b, g2e, g3/ cif ab . 
 
 J ' 
 
 
 
 
 J2C, cid, d$e, 450, ab . . . . 
 
 
 
 
 
 12(1 2f fid 
 
 
 
 
 
 nothing visible in place of v 
 fid, d2c, c^a, bia limit a. 
 
 
 
 
 
 
 37-9 
 36.2 
 32.7 
 31-5 
 31.0 
 
 30.9 
 28.0 
 27.1 
 25.6 
 25.6 
 
 <I2 
 <I2 
 
 <I2 
 
 <I2 
 <I2 
 
 <I2 
 <I2 
 
 n>. di 
 
 10.92 
 II .40 
 
 "57 
 11.63 
 11.66 
 12.03 
 
 12. 15 
 
 12.35 
 12.35 
 
 <n-4 
 
 <I2 
 
 <I2 
 <I2 
 <I2 
 
 12.36 
 IO.O9 
 
 9-95 
 9-83 
 
 9.60 
 
 9-35 
 
 9.48 
 
 9-45 
 9-40 
 
 9-77 
 9-95 
 10.08 
 
 10.40 
 II . II 
 
 <n.3 
 
 <I2. 3 
 <I2.6 
 <I2. 5 
 
 
 
 
 C2a, ao-ib 
 
 
 
 
 
 (62a J2d d$c czb 
 
 \. 
 
 
 
 
 
 i.bi2a, limit a 
 }id, d^^c, c^a, b2a 
 
 ) 
 
 
 
 
 C2 30 bia 
 
 
 
 
 
 C2 3<z, limit a 
 
 
 
 
 
 nT,d, 040 
 
 
 
 
 
 fa is not the var. v is in line 
 1 cae, r3/, k$v 
 
 Ill, VI-2J, T)2-$d 
 J2V, V2C 
 
 '5", fy>, T40 
 fyv, uyi 
 d2v, vie, f$v, v^u 
 
 ) 
 
 good 
 
 good 
 good 
 fair 
 fair 
 fair 
 moon 
 good 
 fair 
 good 
 fair 
 good 
 
 fair 
 good 
 fair 
 good 
 fine 
 fine 
 good 
 
 good 
 good 
 good 
 
 good 
 good 
 
 fair 
 fair 
 poor 
 
 fair 
 low 
 low 
 moon 
 good 
 good 
 
 6 
 
 24 
 37 
 50 
 60 
 65 
 7i 
 84 
 97 
 98 
 
 504 
 523 
 525 
 
 2 
 
 '3 
 13 
 
 23 
 
 27 
 33 
 40 
 
 43 
 5i 
 
 68 
 90 
 
 + 0.82 
 
 + 1.26 
 + 1.50 
 + 1-37 
 + 1.23 
 + 1 . 14 
 + 1.23 
 + 1.17 
 + 1.08 
 + 1.04 
 
 + I.2O 
 O. IO 
 -0.15 
 
 O.07 
 
 -0.08 
 -0.30 
 
 -0.17 
 
 O.26 
 0.41 
 
 O.2O 
 O. IO 
 -0.13 
 
 O.2I 
 + O.OI 
 
 39.6, 36.2 $ 
 36.6, 36.0, 36.0 
 32.5, 32.9 
 31-6, 31-5, 3'.6 
 31.5, 30.6 
 31.5, 31.9, 29.5, 30.6 
 26.9, 29.1 
 
 C$V, VI 2O 
 
 ej 811, vo, 
 
 276 26 7 . 
 
 a2v, limit "V 
 
 
 a2v, limit v 
 
 
 v not seen limit c ... 
 
 
 
 
 
 "v not seen limit a ... 
 
 
 
 V not seen, limit 2<a 
 
 
 
 v not seen limit a 
 
 
 
 a2v, limit v 
 
 
 25.6 
 
 41.8 
 42.8 
 43-5 
 
 45-1 
 46.9 
 46.0 
 
 46.3 
 46.6 
 
 44.2 
 42.8 
 42.0 
 
 39-7 
 34-5 
 
 vk, vim, xyi 
 xyv, 112k 
 
 XI-2V, V2k 
 
 xiv, v6m, vs~6k 
 xi 2V, 115 6k, 713 4n 
 
 VO- IX, 
 
 40.2, 41.9, 43.4. . . . 
 43-4, 42.2 
 44.9, 42.2 
 
 44-9, 45-7, 46.3- I 
 45-4, 46.9. 45-7- / 
 
 VIX 
 
 47.4 ) 
 
 xiv, V2-$n 
 xo-iv, 714*1 
 xiv, v$n 
 
 X2V 
 
 45-4, 45-0 I 
 45-9, 46.8 
 45-4, 47-8 
 
 44.4 . . 1 
 
 xyv, V2n 
 XJ.V, vtn, V2k 
 
 211, V2k 
 
 x^v, vn 
 
 k3V,vsl,v6f 
 vf 
 
 43-4, 44-8 / 
 42.4. 43-8, 42-2 
 42.4, 42.8 1 
 40.8, 42.2 / 
 
 37.2, 41.6, 40.5 
 
 v not seen, limit d 
 
 
 v not seen, limit 2<a 
 
 
 
 v not seen limit 34 < a . . . 
 
 
 
 f not seen, limit 3<Cfl 
 
 
 
 
 
 
154 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 95. 7458 V DELPHINI. VISUAL OBSERVATIONS OF THE VARIABUJ. Continued. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 a 
 
 1 
 I 
 
 < 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Meaus. 
 
 Seeing 
 
 I. 
 
 1 
 
 4 Mag 
 
 Month 
 and Day. 
 
 Hour 
 C.S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 46 
 
 47 
 
 48 
 
 49 
 5 
 51 
 52 
 53 
 54 
 55 
 56 
 
 57 
 
 58 
 59 
 60 
 61 
 62 
 63 
 64 
 65 
 66 
 
 67 
 68 
 
 69 
 70 
 
 7i 
 72 
 73 
 74 
 75 
 76 
 77 
 78 
 79 
 80 
 
 81 
 82 
 83 
 
 84 
 
 85 
 86 
 
 87 
 88 
 89 
 90 
 9i 
 92 
 
 93 
 95 
 96 
 
 97 
 98 
 99 
 
 1898 
 Feb. 15 
 Mar. 2 
 15 
 23 
 April i 
 
 15 
 June 19 
 
 21 
 
 July 7 
 18 
 Aug. 9 
 
 i? 
 
 1899 
 Jan. 9 
 Mar. 22 
 Apr. 1 6 
 May 10 
 29 
 June 7 
 10 
 26 
 July 8 
 Aug. 10 
 
 22 
 30 
 
 Sept. 4 
 20 
 
 Oct. 2 
 
 6 
 18 
 
 24 
 Nov. 3 
 8 
 15 
 
 22 
 26 
 
 Dec. 7 
 
 19 
 
 28 
 
 1900 
 Jan. 4 
 
 24 
 Mar. 2 
 May i 
 
 3 
 ii 
 June 8 
 19 
 
 28 
 
 July 20 
 25 
 Aug. 1 6 
 
 29 
 
 30 
 Sept. 6 
 
 18 
 18 
 i? 
 17 
 16 
 16 
 10 
 13 
 
 IO 
 
 II 
 9 
 9 
 
 6 
 
 17 
 16 
 
 15 
 
 IO 
 IO 
 
 15 
 
 IO 
 IO 
 
 9 
 9 
 9 
 
 9 
 
 8 
 8 
 8 
 8 
 
 7 
 8 
 
 6 
 
 7 
 6 
 
 6 
 
 7 
 
 6 
 6 
 
 14 
 16 
 
 14 
 15 
 15 
 "4 
 
 '3 
 
 12 
 12 
 13 
 '3 
 IO 
 
 9 
 
 2410000+ 
 4337-00 
 4352.oo 
 4364.92 
 4372.92 
 4381.88 
 
 4395 83 
 4460.67 
 4462 . 63 
 4478.67 
 4489.71 
 4511-63 
 4519.63 | 
 
 4664.50 
 
 4736 96 
 4761.92 
 4785.88 
 4804 . 67 
 4813.67 
 4816.88 
 4832.67 
 4844.67 
 4877.60 
 4889.66 
 4897.60 
 
 4902 . 60 1 
 
 4918.56 
 4930.56 
 4934.56 
 4946.56 
 4952.54 
 4962.58 
 
 4967.54 
 4974 50 
 4981.52 
 4985 50 
 
 4996 . ] 
 5008 . 50 
 5017-52 
 
 5024.50 
 5044 . 50 
 5081.83 
 5141-92 
 5143-83 
 5151.88 
 5179.88 
 5190.83 
 
 5"99.79 
 
 5221.75 
 5226.75 
 5248.79 
 5261.79 
 
 5262.67 
 5269.63 
 
 150 
 150 
 150 
 150 
 
 80 
 80 
 
 150 
 150 
 200 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 150 
 40 
 
 40 
 40 
 80 
 40 
 40 
 40 
 40 
 40 
 40 
 150 
 40 
 150 
 
 150 
 "So 
 
 275 
 
 275 
 
 460 
 237 
 350 
 
 237 
 
 237 
 460 
 460 
 
 700 
 
 237 
 237 
 
 6 
 6 
 6 
 6 
 
 12 
 12 
 12 
 12 
 12 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 
 12 
 12 
 40 
 40 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 
 4 
 
 40 
 40 
 
 v not seen limit a 
 
 
 <I2.2 
 
 <n.i 
 <n.8 
 
 <I2.2 
 
 11.83 
 10.83 
 
 II .21 
 II .42 
 11.76 
 12.03 
 12.67 
 
 12.68 
 
 <I2.2 
 <I2.2 
 <I2.2 
 <I2.3 
 <I2.2 
 <I2-3 
 <I2.4 
 <I2.5 
 <I2.7 
 <I2-4 
 < 12.2 
 
 "33 
 
 9.86 
 
 7.83 
 7.80 
 
 7-93 
 8.52 
 8.46 
 8.83 
 8.83 
 8.97 
 9-'5 
 9.14 
 
 9-85 
 
 10.15 
 10.50 
 
 10.78 
 ii .40 
 12.74 
 
 <*3 
 
 14.4 
 
 14.58 
 
 good 
 fair 
 fair 
 fair 
 good 
 good 
 good 
 
 good 
 fair 
 good 
 
 fair 
 
 5'8 
 3 
 68 
 70 
 86 
 
 97 
 119 
 
 127 
 
 + '43 
 + 0.95 
 + 0.61 
 + 0.78 
 
 + 0.74 
 
 + 0-75 
 + 0.85 
 
 + 0.65 
 
 D not seen limit / 
 
 
 
 i) not seen limit 1 4 M < k . . . 
 
 
 
 
 
 
 1)2<J, fSV 
 
 29-6, 29.5 
 37-5, 38.6, 34.5, 34.2 
 33-5. 31-9, 36.4 
 33.0, 32.4 
 29-5, 28.4, 32.6 
 27-5, 28.6 
 24-1, 22.5 
 23-1, 23-0 ) 
 2-16 f 
 
 29-5 
 36.7 
 33-9 
 32.7 
 30.2 
 28.0 
 23-3 
 23-2 
 
 jiv, vie, Dg 
 
 /I-2D, 11I-2C 
 
 d^-v, c2-y.', v$a 
 d6v, via 
 03-41), D2-3;y 
 a4-5^, "37. l' m >t y 
 a$v limit V 
 
 
 
 v not seen limit a 
 
 
 
 
 
 
 v not seen limit a 
 
 
 
 
 
 
 D not seen, limit i <<* 
 
 
 
 
 
 
 v not seen limit a 
 
 
 
 
 
 
 
 
 
 fair 
 good 
 fair 
 good 
 good 
 moon 
 good 
 
 good 
 
 good 
 good 
 good 
 moon 
 good 
 fair 
 good 
 good 
 fair 
 fair 
 
 fair 
 good 
 
 fair 
 poor 
 fair 
 fair 
 
 poor 
 
 505 
 51 
 526 
 9 
 13 
 25 
 3i 
 4i 
 46 
 
 53 
 60 
 
 64 
 
 75 
 
 87 
 96 
 
 103 
 123 
 1 60 
 
 222 
 230 
 
 + 0.23 
 
 -o-95 
 -2.26 
 - 93 
 - -75 
 - .16 
 
 - -34 
 - -17 
 - -27 
 - -30 
 - .26 
 - .36 
 0.92 
 0.89 
 -0-75 
 
 0.65 
 -0.52 
 -0.13 
 
 o.o 
 
 -o. 4 
 
 11 not seen limit 2 <a 
 
 
 
 D not seen limit 2<Co 
 
 
 
 i> not seen, limit 4~5<a. . . 
 
 
 
 
 
 v not seen, limit a 
 
 
 
 i>4-5a, -vg, /3-4D 
 
 T5g, 1)4^ k2V fn2U 
 
 32.1, 36.4, 31.0 
 
 4i-4,38.5,39.9,39.9l 
 48.4, 48.4, 48.4. . . ) 
 56.4,57.2 
 56.4, 57-7 
 56.4, 56.2, 56.3 
 
 33-2 
 43-5 
 56.8 
 57-i 
 56.3 
 52.4 
 52.8 
 
 50.5 
 50.3 
 49-3 
 48. i 
 
 48.3 
 44-8 
 
 41.3 
 39 o 
 
 37-0 
 32.7 
 
 22.7 
 
 D4-5n, Ti2x, vid 
 DijM>;t:, V2g 
 
 VIOX, D2~3 
 
 viox, vis, v( 
 1)6* 
 
 Tl&x i , 411 
 
 54. 4. SI 2 . 
 
 51;, 1)4* 
 41), vyc 
 
 5-6l>, V2-3X 
 
 6-8i>, vi-2x 
 E6-8D, i>2x 
 
 X2^V 
 
 50.7, 50.4 
 51.2, 49.4 
 49.7, 48.9 
 48.2, 47-9 
 48.2, 48.4 
 47 q . . . . ) 
 
 X2-$V, t'4 
 
 xffv, nii>, D5~6g 
 n\v, f3-4/, i>4g 
 
 n$v, i)g, V2-3/ 
 
 g4D, J1-2V, 1)1-2* 
 
 a6i>, v3~4y, limit y 
 
 43.9, 46.8 > 
 40.4, 41.8, 41.9 
 38.8, 38.0, 40.4 
 
 37-8, 36.4, 37-0 
 32.4, 33-0 
 21.6, 23.5 
 
 IMS i to ii M <;c, /* is 2"<y. 
 i' is i to i ^ M < y, }'3~ 4^ . . . 
 
 
 
 
 
 f- seen, but nothing near i 
 11 not seen limit I M <^ . . 
 
 
 
 
 <2.0 
 
 -0-5 
 30 
 
 -3-S 
 
 <4 
 
 15-44 
 
 15-08 
 16.0 
 <I5 
 17- o 
 
 <i5 
 
 <I3 
 
 moon 
 fair 
 fine 
 
 2 7 8 
 
 300 
 305 
 
 O.22 
 
 1. 00 
 -O.I 
 
 T MO ITT 7T<i 5D. . . . ) 
 
 
 
 l/^' k ' ' ' > 
 
 
 
 
 
 
 i -v glimpsed, not steadily held 
 |T is iito2"<<", andiw<.4 
 
 ) 
 
 
 fair 
 
 moon 
 moon 
 
 340 
 
 + o.4 
 
 ) 
 
 
 
 
 
 
 
 
CHAPTER XI. V UELPHINI. 
 
 155 
 
 TABLE 95. 7458 V DELPHINI. VISUAL OBSBRVATIONS OP THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 i4 
 
 a 
 
 1 
 fi 
 
 | 
 
 < 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 4 Mag. 
 
 Month 
 and Day. 
 
 Hour 
 
 C. S. T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 IOO 
 
 1OI 
 
 1 02 
 
 103 
 
 104 
 
 105 
 
 106 
 107 
 108 
 
 109 
 
 IIO 
 III 
 
 112 
 
 "3 
 
 114 
 
 "5 
 
 116 
 
 "7 
 118 
 119 
 1 20 
 
 121 
 122 
 123 
 124 
 
 125 
 126 
 
 127 
 128 
 
 I2Q 
 
 130 
 IS' 
 
 132 
 
 '33 
 
 '34 
 135 
 136 
 137 
 138 
 139 
 140 
 
 MI 
 
 142 
 
 '43 
 
 19 o 
 Sept. 3 
 Oct. 4 
 
 16 
 Dec. 1 1 
 '9 
 
 1901 
 Oct. 18 
 Nov. i 
 
 4 
 Dec. 2! 
 
 1902 
 Mar. 28 
 
 Apr. 1 2 
 May 8 
 29 
 
 July 3 
 Sept. 7 
 
 26 
 
 1903 
 
 Apr. 3 
 July 24 
 Sept. 17 
 Oct. 9 
 25 
 
 1904 
 July 31 
 Aug. 3 
 6 
 
 Oct. 8 
 
 Nov. 30 
 
 1905 
 Jan. 3 
 Mar. 1 2 
 
 Apr. 4 
 
 II 
 30 
 May 22 
 
 June 4 
 
 13 
 26 
 July 23 
 Aug. 9 
 ii 
 28 
 Sept. 17 
 Oct. i 
 
 20 
 
 Dec. 30 
 
 12 
 IO 
 
 9 
 6 
 6 
 
 8 
 8 
 
 9 
 6 
 
 15 
 15 
 13 
 
 12 
 
 IO 
 10 
 
 II 
 
 15 
 10 
 
 8 
 
 12 
 
 9 
 
 12 
 II 
 II 
 
 7 
 
 7 
 i? 
 16 
 
 16 
 15 
 
 14 
 
 14 
 
 14 
 1 1 
 
 IO 
 
 9 
 
 10 
 
 9 
 8 
 IO 
 
 7 
 6 
 
 2410000 + 
 5276.75 
 5297-67 
 
 5309-63 
 
 5365 50 
 5373-50 
 
 5676.58 
 5690.58 
 5693.63 
 5740.50 
 
 5837-88 
 5852.88 
 5878.79 
 5899-75 
 
 5934-67 
 6000.67 
 
 6019.63 
 
 6208 . 88 
 6320.67 
 6375-58 
 6397 
 6413 
 
 6693.75 
 6697.63 
 6700.75 
 6700.71 
 6762.71 
 6815.54 
 
 6849.54 
 6917.94 
 
 6940.92 < 
 
 6947.92 
 6966. 8 8 
 6988.83 
 
 7001.83 - 
 
 7010.83 
 7023.71 
 7050.67 
 7067.63 
 7069.67 
 7086.63 
 7106.56 
 7120.67 
 
 7139.54 
 7210.50 
 
 237 
 237 
 460 
 
 150 
 150 
 
 130 
 275 
 460 
 350 
 
 237 
 237 
 460 
 
 237 
 so 
 
 237 
 
 237 
 237 
 so 
 
 150 
 
 67 
 
 237 
 40 
 
 237 
 450 
 750 
 750 
 
 750 
 
 237 
 450 
 250 
 250 
 450 
 237 
 300 
 
 237 
 40 
 
 40 
 150 
 237 
 so 
 
 237 
 
 40 
 40 
 40 
 
 6 
 6 
 
 12 
 12 
 40 
 40 
 
 40 
 40 
 40 
 40 
 12 
 24 
 40 
 
 40 
 40 
 
 6 
 
 12 
 12 
 
 6 
 12 
 
 18 
 
 12 
 40 
 
 6 
 
 40 
 40 
 40 
 40 
 
 40 
 
 40 
 40 
 40 
 40 
 40 
 40 
 
 12 
 4 
 
 6 
 
 12 
 
 6 
 6 
 
 40 
 
 12 
 40 
 
 
 
 
 <I5 
 <H 
 <i6 
 
 <I2.8 
 <I2.5 
 
 <I3 
 <i3-5 
 <i5-i 
 OS 
 
 <i3-9 
 <i6.7 
 
 15 20 
 
 14.66 
 
 <U 
 
 10.4 
 
 10.29 
 
 14.90 
 <4 
 
 <I2.6 
 
 <I3 
 
 <3 
 
 <I2 
 
 <i3 
 
 15.00 
 
 <I4 
 <J5 
 
 <I2.3 
 
 <i5 
 <i4.o 
 
 14.86 
 
 14-59 
 14. 16 
 
 13-57 
 
 13-36 
 
 12.79 
 12.60 
 10.83 
 10.15 
 10-35 
 
 1O.2I 
 IO.62 
 10.98 
 II-50 
 3-57 
 
 moon 
 moon 
 
 good 
 
 
 
 v not seen, limit tu' or 4<y 
 (v suspected, not held.limit 
 
 ( !*</*. 
 
 
 
 
 
 
 
 v not seen limit 3<fl 
 
 
 
 
 
 
 v not seen, limit y . . 
 
 
 
 moon 
 good 
 poor 
 fair 
 
 moon 
 good 
 fair 
 fair 
 
 428 
 449 
 
 0.06 
 + 0.43 
 
 v not seen, limit 3<y. . 
 
 
 
 v not seen limit i-2<7T 
 
 
 
 it not seen limit TT 
 
 
 
 y not seen limit 6<y 
 
 
 
 f v not seen, limit 4<Aor 
 \ 2-3<;r 
 <Pyi, l ) 2i>, l>-2i!, TIT; 
 f f3-4/ x , i. u , y8-iav .... 
 \v is i ".36 <y, photometer 
 v not seen y limit 
 
 i 
 
 V 
 
 
 \ 
 
 1.5, 1.5, o.o, 3.0 
 
 }.. 
 
 i5 
 5-5 
 
 / 
 
 photograph plate . 
 
 
 
 poor 
 poor 
 
 poor 
 poor 
 good 
 
 21 
 40 
 
 229 
 
 + o.8 
 + 0.31 
 
 + 0.34 
 
 <v<x by 1.09=10.37. . . ) 
 \v<d by 0.91 = 10.21 . .. .| 
 
 111-2,'*, VI-27; 
 
 v not seen, limit i>"<y. . . 
 
 
 
 3-5, 5-5 
 
 4-5 
 
 v not seen, limit 4<Cfl 
 
 
 
 
 
 
 v not seen limit y 
 
 
 
 
 
 
 v not seen, limit a 
 
 
 
 
 
 
 v not seen limit y 
 
 
 
 
 
 
 y>4i>, 11411, i>3f>, 114* 
 photographs, Nos 94 95 
 
 0.5, 2.0, 6.5, 8.0. ... 
 
 3-3 
 
 good 
 good 
 fair 
 good 
 
 fair 
 poor 
 
 fair 
 
 fair 
 fair 
 fair 
 
 fair 
 
 fair 
 good 
 good 
 good 
 fair 
 good 
 dull 
 fair 
 good 
 good 
 
 191 
 
 436 
 
 440 
 458 
 480 
 
 493 
 502 
 5'5 
 13 
 30 
 32 
 49 
 69 
 83 
 102 
 
 1/3 
 
 + 0.14 
 
 0.06 
 
 o. 19 
 
 + 0.36 
 + 0.92 
 
 + '35 
 + I-34 
 
 + 2.01 
 
 + 1.13 
 +0.26 
 
 o.oc 
 o.oo 
 + 0.05 
 
 -t-O.IO 
 
 + 44 
 
 <p$v or /*, V or / i 3,0 
 
 
 
 1} not seen limit i 2 <0 
 
 
 
 111 or I 1 -, v or f*ip 
 
 
 
 
 
 
 <f2V, V2f, l>4/i 
 
 fiv, 3,, V3H 
 / v6,'*, VI<P, vi* 
 \ a>8v 
 
 2.5, 5-5, 6.0 
 3-5, 6.5, 5-0 
 8.0, 8.5, 5.0 \ 
 7.5 / 
 
 4.7l 
 5-oi 
 
 7-2 
 
 ii. 8 
 16.5 
 
 18.2 
 
 22.6 
 24.0 
 
 36.5 
 40.9 
 
 W, v 5Vi *8/* 
 1/3 471, aiiv, i>6(u' 
 yyu, viw 
 i>i-2y, VI-2UI 
 
 yi 2V, 1I12U) 
 
 16.0, 9.5, 10.0 
 16.5, 14.0, 16.0. . . ( 
 17.0, 18.0 ) 
 21.5, 16.5 \ 
 i8.s, i6.s / 
 
 V2y, 04-50) 
 <J4T, T4-5r 
 
 V2f 
 
 22. 0, 23.1 
 
 23.6, 24.5 
 
 lid 8g, kiv, vim 
 photographs, Nos. 211, 212 
 kiv, 113111, i>5g 
 
 43-4. 39.2 ( 41.9 
 
 39-2, 43.9, 41.4 
 (32.9), 37-4, 38.5 
 35-4-35.5 
 32.5. 30.9, 32.6 
 16.0, 17.0 
 
 40.4 
 
 37-8 
 35-4 
 3 9 
 16.5 
 
 SIT, Tiif 
 J2ii, vc, -v$a 
 yqv, vo-iiu, v$<r 
 
J56 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 \ Ol In 
 
 < 
 
 to flb 
 
 
 
 
 
 
 
 
 
 t/ 1 
 
 ^ 
 
 
 
 
 7-^55 V DELPHI Nl 
 
 MAR. 1900 SEPT. MAR. 1901 SEPT. MAR. 1902 SEPT. MAR. 1903 SEPT. MAR. 1904 SEPT. 
 ^/C>. 5(700 52(70 5-?O(3 5600 5800 5000 6<?00 6<?00 6600 650O 
 
 
 
 
 
 
 S 
 
 X 
 
 X 1 
 
 
 
 
 
 
 
 / 
 
 X* 
 
 / 
 
 
 
 
 
 
 
 
 
 
 / 
 
 7 
 
 < 
 
 
 < 
 
 
 
 
 
 
 
 
 \ 
 
 \ 
 s 
 
 N. 
 
 
 
 << 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 X 
 
 ""l 
 / 
 
 
 
 
 
 
 
 
 S 
 
 X 
 X 
 
 x' 
 
 X 
 
 
 
 
 
 
 
 
 / 
 
 / 
 
 s 
 / 
 
 < 
 
 - 
 
 
 
 
 
 
 
 
 / 
 / 
 / 
 
 1 
 
 
 < 
 
 
 
 
 
 
 
 
 
 
 \ 
 \ 
 
 < 
 
 X ^ 
 
 
 < 
 
 
 
 
 
 
 
 
 
 
 
 
 ^~ 
 
 
 
 
 - 
 
 "*1 
 
 X 
 
 
 
 
 
 
 
 
 
 x' 
 
 / 
 
 X 
 
 
 
 
 
 
 
 
 / 
 
 s' 
 s 
 
 
 
 
 
 
 
 
 
 / 
 
 / 
 / 
 
 A 
 
 
 
 
 
 
 
 
 
 
 1 
 
 1 
 \ 
 \ 
 
 
 
 
 < 
 
 
 
 
 
 
 
 
 
 ^ t 
 
 -- 
 
 --- 
 
 -- 
 
 -~- 
 
 ^ 
 
 ^ 
 
 
 
 
 
 
 
 
 
 
 f 
 
 X 
 
 X 
 
 / 
 
 
 
 
 
 
 
 
 S 
 
 X 
 X 
 
 
 
 
 
 
 
 
 X 
 
 / 
 
 y' 
 
 s 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 O5 
 
 tn 
 n 
 "D 
 
 65 
 
 en 
 
 , rn 
 Co -o 
 
 in 
 
 n 
 
 o 
 
 $5 
 S 
 
 in 
 ri 
 
 -(x 
 I 
 
 5 
 
 v <O 
 CD 
 
 On 
 
 h 
 
 i 
 
 o 
 
 33 
 
 ocn 
 O n 
 
 FIG. 32. LIGHT-CURVE OF V DKLPHINI. 
 
CHAPTER XI. V DELPHINI. 
 
 TABLE 96. 7458 V DELPHINI. MEAN MAGNITUDES PROM 44^ DAY GROUPS. 
 
 157 
 
 Group 
 I. D . 
 
 Vo 
 
 i 
 
 44 
 
 2 
 88 
 
 3 
 132 
 
 4 
 176 
 
 5 
 220 
 
 6 
 265 
 
 7 
 39 
 
 8 
 353 
 
 9 
 397 
 
 10 
 
 441 
 
 ii 
 
 485 
 
 12 
 529 
 
 
 
 
 3334 
 3863 
 
 4392 
 4921 
 
 5450 i 
 5979 ' 
 6508 - 
 
 7037 ' 
 Means ' 
 
 f t 
 M 
 
 1 JM 
 L No. 
 
 ( - 
 
 | JM 
 L No. 
 
 r t 
 
 1 M 
 ] JM 
 L No. 
 
 r ' < 
 
 M 
 
 JM 
 
 L No. 
 
 r M' 
 
 JM 
 No. 
 
 f M' 
 JM 
 No. 
 
 r t 
 M 
 JM 
 No. 
 
 1 
 M 
 
 4M 
 
 k No. 
 
 f J 
 
 JM 
 , No. 
 
 22 
 10.98 
 
 + 1.19 
 3 
 
 24 
 9.60 
 
 O.2O 
 
 8 
 
 3 
 10.83 
 
 + 0.95 
 i 
 
 24 
 8.31 
 -1.47 
 5 
 
 66 
 11.81 
 + 1.23 
 
 5 
 
 60 
 10.24 
 -0.17 
 
 2 
 
 75 
 11.46 
 + 0.71 
 3 
 
 64 
 9-35 
 -i. 17 
 6 
 
 98 
 13-35 
 4-1.06 
 
 2 
 
 
 
 
 
 
 
 
 57 
 10.80 
 4-0.32 
 3 
 
 5l8 
 
 11.83 
 
 + I-43 
 
 i 
 
 514 
 9.67 
 -0.99 
 3 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 114 
 12.46 
 + 0.75 
 
 3 
 
 107 
 10.89 
 0.64 
 3 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1 60 
 12.74 
 -0.13 
 i 
 
 
 226 
 14- 3 
 
 -0.2 
 
 2 
 
 294 
 15-49 
 -0.44 
 3 
 
 340 
 17. o 
 4-o. 4 
 i 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 428 
 15.20 
 0.06 
 
 i 
 
 449 
 14.66 
 
 4-0.43 
 
 i 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3 
 10.34 
 + 0.56 
 
 2 
 
 
 
 
 
 229 
 
 14.90 
 + 0.34 
 I 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 191 
 
 15. 
 4-i-4 
 i 
 
 
 
 
 429 
 
 14-77 
 -0.39 
 3 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 23 
 9.62 
 -0.17 
 19 
 
 66 
 10.63 
 + 0.06 
 16 
 
 107 
 11.85 
 4-0.31 
 8 
 
 160 
 12.74 
 -0.13 
 i 
 
 191 
 
 i5- 
 4-i. 4 
 i 
 
 227 
 I4-50 
 O.O2 
 
 3 
 
 294 
 
 15-49 
 -0.44 
 
 3 
 
 34 
 17. o 
 4-0. 4 
 i 
 
 
 429 
 14.88 
 -0.31 
 4 
 
 449 
 14.66 
 + 0.43 
 I 
 
 5i6 
 10.46 
 0.08 
 
 7 
 
 MAGNITUDE-CURVE. 
 
 Fig. 31 gives a graphic view of the relation between the visual and photo- 
 metric magnitudes. From this curve are taken the magnitudes of the stars not 
 measured photometrically, and also the magnitude of the variable. The devia- 
 tion of the star / from the curve seems greater than is allowable ; this is explained 
 by the fact that its place in the light scale depends on but one comparison with 
 the variable, and therefore the effect of an error is slight. 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 too 
 
 200 
 
 DAYS 
 
 3OO 
 
 +OO 
 
 SOO 
 
 60O 
 
 10 
 
 II 
 
 7458V DELPHI Nl 
 Max.' 536 <* 
 
 u 
 o 
 
 t/3 
 I 
 
 IS 
 
 n 
 
 FIG. 33. MEAN LIGHT-CURVE FOR V DEUPHINI. 
 LIGHT-CURVE. 
 
 Fig. 32 shows the star's variations from June, 1894, to August, 1904, the 
 parts of the curve determined by the observations being drawn full, the parts 
 assumed, with a broken line. When the variable was invisible the limit of vision 
 is indicated by the point of the V-shaped characters. It will be seen that the 
 observations fix definitely the number of maxima possible during this interval, 
 determine the time of maximum for epochs 4, 5, and 6, with considerable certainty, 
 and of epochs 3 and 8 less definitely, and show that the magnitude at minimum 
 is in the neighborhood of 17. 
 
CHAPTER XI. V DELPHINI. 159 
 
 The striking characteristics of the star's variation are its great range, but 
 little less than 10 magnitudes, and its rapid rise to maximum, best shown at 
 epoch 6. The curve at maximum is usually quite sharp, though this is not con- 
 firmed by the observations of Reed at Harvard in 1891, published in Astronomical 
 Journal, 13, 63. Further reference to these observations will be made later. 
 The shape of the curve near minimum can be inferred by combining the observa- 
 tions on the descending branch of the curve following maximum 6 in 1900, and 
 those on the ascending branch preceding maximum 8 in 1902. Combining 
 these observations with the limit of vision when the star was not seen, the curve 
 at minimum is fixed very nearly as drawn. 
 
 PERIOD OF VARIATION. 
 
 The elements of maximum given by Chandler in his Third Catalogue and 
 retained in his "Revised Elements," published in 1904 
 
 1890 December 20 (2411722) + 54o d E. 
 
 are based on six maxima between 1890 and 1899, fitting the first five maxima 
 very well, but requiring a correction of - 34 days for epoch 6, and about - 80 
 days at epoch 9. The observations now available are represented better by the 
 
 elements, 
 
 1891 January 14 (2411747) 
 
 This was obtained by using only the best observed maxima, 2, 4, and 6, and 
 shortening the period thus obtained 2 days on account of the last maximum 
 in the light -curve, No. 9. 
 
 In this connection two sets of observations require separate consideration. 
 First, Mrs. Fleming's measures from the photographs, published in Astronomische 
 Nachrichten,\27, 5, showing that the star was invisible, less than loth magnitude, 
 on six dates from June 30 to October 28, 1890, and photographically 9.3 magni- 
 tude, November 28; 8.6 on December 19; 9.0 December 20, and 8.7 on December 
 22. Considering the small number and range on these plates it is thought that 
 no violence is done to them by assuming the date of maximum to be as late as 
 January 14. Second, a set of observations made at Harvard by W. M. Reed, 
 and published in Astronomical Journal 13, 63, are not in accord with the above 
 elements and mean light-curve. They are given in Table 97, with the addition 
 of three columns giving respectively the Julian day, the number of days after 
 the preceding maximum as calculated by the foregoing elements, and the cor- 
 responding magnitude from the mean light-curve. 
 
i6o 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 97. 
 
 Reed. 
 
 
 
 Mag. 
 
 
 
 . D. 
 
 
 from 
 
 Date. 
 
 Mag. 
 
 
 
 curve. 
 
 1891 May 28 
 
 9.2 
 
 1881 
 
 + 134 
 
 12.6 
 
 June 9 
 
 9-i 
 
 i893 
 
 + 146 
 
 12.9 
 
 June 15 
 
 9.0 
 
 1899 
 
 + 152 
 
 13.0 
 
 July 9 
 
 9.0 
 
 1923 
 
 + 176 
 
 13-5 
 
 July 27 
 
 9.2 
 
 1941 
 
 + '94 
 
 13-9 
 
 Aug. 20 
 
 
 
 
 
 Sept. 2 
 
 9-4 
 
 1978 
 
 + 231 
 
 14.6 
 
 1892 Nov. 3 
 
 9.0 
 
 2406 
 
 + 130 
 
 12.6 
 
 If Chandler's elements are used the intervals after maxima will be still greater, 
 so that a considerable change in period or form of curve must be assumed to 
 explain the discrepancy, unless the star was misidentified. 
 
 NOTE. The well observed maximum of epoch 10, completed since the above 
 was written, gives a correction to the ephemeris of +34 days. Using the three 
 best determined maxima, the period between epochs 4 and 6 is 524 days, between 
 6 and 10 it is 539 days, giving a mean period of 533 days, and indicating a secon- 
 dary term in the elements, which will require further observations to definitely fix. 
 
 TABUS 98. 7458 V DSUPHINI. OBSERVED MAXIMA. AND MINIMA. 
 
 Elements of maximum. 1891 Jan. 14 (J. D 2411747H529' 1 E. M-m=16I'>. 
 
 MAXIMA. 
 
 MINIMA. 
 
 I 
 
 w 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 W 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 p. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 3 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 
 IO 
 
 1 895 May 1 5 
 1896 Nov. 16 
 1898 May 5 
 1 899 Oct. i 
 1901 Mar. 16 
 1902 Aug. 22 
 1 904 Jan. 20 
 1905 Aug. 1 8 
 
 33 2 9 
 3880 
 
 44'5 
 4929 
 
 5455 
 5984 
 6500 
 7076 
 
 10.50 
 9.40 
 
 10.76 
 
 9.66 
 
 me 
 me 
 8.08 
 10.3 
 me 
 10.36 
 
 IO 
 + 12 
 
 + 18 
 + 3 
 + 5 
 o 
 
 -13 
 
 + 34 
 
 6 
 19 
 
 IO 
 
 24 
 
 4 
 i 
 20 
 
 4 
 5 
 7 
 8 
 
 9 
 
 IO 
 
 1896 May 30 
 1897 Nov. 1 8 
 1900 Sept. 27 
 1902 Feb. 26 
 1903 Aug. 23 
 1905 Jan. 4 
 
 371 
 
 4247 
 5290 
 5807 
 f>350 
 6850 
 
 17.0 
 
 me 
 me 
 
 17-3 
 me 
 me 
 me 
 
 + 3 
 + 11 
 - 4 
 -16 
 
 2 
 
 -35 
 
 i 
 i 
 8 
 
 2 
 2 
 2 
 
 
 7.80 
 
 IO.O 
 
 IO. IO 
 
CHAPTER XII. 
 
 R. A. 
 
 85 1 8 Z CASSIOPEIA, 
 jm 395.9; Dec. + 56 i' 33" (1900). 
 
 This variable was discovered by Anderson in 1898 and observations began 
 in January, 1899. The field was measured with the micrometer on the 6-inch 
 in January and February, 1899, but as the approximate place given for the star 
 fell nearer to r than to the true place of the variable, that star was marked as 
 the variable in the finding chart published by the writer in Popular Astronomy, 
 7, 94. The place of the variable given above was measured with the 6-inch from 
 the stars a and b, which are given in the Helsingfors-Gotha A. G. catalogue. 
 The stars b, d, n, and x were connected with the variable in January, 1900, with 
 the 40-inch. 
 
 My experience with this field is a good illustration of the advantage of using 
 several standard magnitude stars. The list selected included B. D. +54 3033, 
 but after the photometer measures were completed it was found that the star had 
 been misidentified, 3036 being measured instead. The measures were therefore 
 reduced with the other two stars as standards, without much loss in accuracy. 
 
 A few of the faint comparison stars are so close to the variable that the 
 scale used for the other charts would be too small; this chart is therefore repro- 
 duced on nearly double the usual scale. 
 
 TABLE 99. 8518 Z CASSIOPEIA. STANDARD MAGNITUDE STARS. 
 
 Star. 
 
 B. D. No. 
 
 1900. 
 
 Color 
 P. DM. 
 
 Magnitude. 
 
 Residuals. 
 
 R. A. 
 
 Dec. 
 
 Catalogue. 
 
 Measured. 
 
 From Cats. 
 
 3 
 Nights 
 inter 
 se. 
 
 H. C. O. 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 A 
 D 
 
 o 
 
 + 55 3010 
 + 55 2990 
 
 h m s 
 23 39 56 
 23 32 26 
 
 O / 
 
 + 55 14-7 
 + 55 '9-4 
 
 WG 
 G 
 
 6.48 
 7-5i 
 
 6.58 
 7.20 
 
 6.76 
 7.24 
 
 6.65 
 7.13 
 
 + 28 
 -27 
 
 + 7 
 -7 
 
 4 
 5 
 
 7.00 
 
 6.89 
 
 7.00 
 
 6.89 
 
 28 
 
 7 
 
 4 
 
 
 
 
 
 TABLE 100. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 Star. 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 O 
 
 
 h m s 
 
 o 
 
 b 
 
 + 55 3007 
 
 9.2 
 
 23 37 5 
 
 + 55 5 -o 
 
 a 
 
 + 55 30" 
 
 8.6 
 
 23 37 47 
 
 + 55 39-9 
 
 161 
 
162 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 101. COMPARISON STARS FOR Z CASSIOPELE (IN ORDER OF RIGHT ASCENSION). 
 
 
 Coordinates from Variable. 
 
 
 Magnitude. 
 
 Star. 
 
 
 
 Light 
 Scale, 
 
 Measured. 
 
 From Curve. 
 
 
 R. A. 
 
 Dec. 
 
 Steps. 
 
 
 
 
 
 
 
 
 
 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 h 
 
 n 
 
 -276 
 
 -32-9 
 
 H 
 
 + 3 
 
 37-0 
 
 10-75 
 
 10.64 
 
 
 
 b 
 
 208 
 
 24.8 
 
 + 200 
 
 44.1 
 
 9-79 
 
 9.68 
 
 
 
 f 
 
 -188 
 
 22.4 
 
 420 
 
 
 
 
 
 
 1 
 
 g 
 
 -182 
 
 -21.7 
 
 -3" 
 
 27-5 
 
 11.97 
 
 11.86 
 
 
 
 X 
 
 -"7 
 
 -13 9 
 
 + 97 
 
 17.1 
 
 I3-38 
 
 13.27 
 
 
 
 1 
 
 92 
 
 ii .0 
 
 188 
 
 
 
 
 
 
 r 
 
 - 89 
 
 10.6 
 
 -182 
 
 3i-5 
 
 
 
 "-45 
 
 "34 
 
 e 
 
 - 88 
 
 -10.5 
 
 -137 
 
 23.1 
 
 12.25 
 
 12. 14 
 
 
 
 k 
 
 - 78 
 
 - 9-3 
 
 -239 
 
 21.6 
 
 12.99 
 
 12.88 
 
 
 
 s 
 
 - 47 
 
 - 5-6 
 
 - 8 
 
 6.0 
 
 
 
 14-32 
 
 14.21 
 
 o 
 
 - 23 
 
 - 2.7 
 
 - 83 
 
 99 
 
 13 96 
 
 13-85 
 
 
 
 n 
 
 - 17 
 
 2.O 
 
 - 9 
 
 8.0 
 
 13.96 
 
 13-85 
 
 
 
 t 
 
 + 3 
 
 + 0.4 
 
 + 40 
 
 I .0 
 
 
 
 14.88 
 
 '4-77 
 
 u 
 
 + 4 
 
 + a. 5 
 
 + 22 
 
 i-5 
 
 
 
 14.82 
 
 14.71 
 
 w 
 
 + 17 
 
 + 2.0 
 
 - 17 
 
 o.o 
 
 
 
 15.00 
 
 14.89 
 
 g 
 
 + 28 
 
 + 3-3 
 
 + 57 
 
 II. O 
 
 3-72 
 
 13.61 
 
 
 
 d 
 
 + 40 
 
 + 4.8 
 
 + 121 
 
 36.4 
 
 10.94 
 
 10.83 
 
 
 
 P 
 
 + 40 
 
 + 4.8 
 
 + 37 
 
 IO.O 
 
 13.64 
 
 13-53 
 
 
 
 a 
 
 + 139 
 
 + 16.6 
 
 -448 
 
 
 8.32 
 
 8.21 
 
 
 
 TABLE 102. 8518 Z CASSIOPELB. PHOTOMETER MEASURES OF COMPARISON STARS. 
 
 1904 September 5. 6-INCH. Good, a little dull. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 o 
 
 
 
 
 
 
 
 
 20 39 
 
 31 
 
 Dai 
 
 13.3 12.8 13.4 
 
 I3-I7 
 
 12.95 
 
 0.63 
 
 7-94 
 
 7-83 
 
 
 
 E 
 
 14-3 '3 7 15 o 
 
 '4-33 
 
 14-33 
 
 0.84 
 
 8-15 
 
 8.04 
 
 
 
 Ad\ 
 
 10.0 9.0 9.9 
 
 9 63 
 
 9-55 
 
 0.24 
 
 7-55 
 
 7-44 
 
 
 
 a 
 
 17.0 15.8 15.9 
 
 16.23 
 
 16.62 
 
 1.17 
 
 8.48 
 
 8-37 
 
 
 
 h 
 
 37-5 39-9 38-2 
 
 38.53 
 
 37-82 
 
 3-65 
 
 10.96 
 
 10.85 
 
 
 30 
 
 b 
 
 24-5 25.1 25.0 
 
 24.87 
 
 25-22 
 
 2-15 
 
 9.46 
 
 9 35 
 
 
 
 d 
 
 39-5 39-9 39-8 
 
 39-73 
 
 39-78 
 
 3.82 
 
 "-13 
 
 ii .02 
 
 
 
 d 
 
 40.0 39. 7 39.8 
 
 39-83 
 
 
 
 
 
 
 
 b 
 
 24 .9 2S . 2$ Q 
 
 2? 57 
 
 
 
 
 
 
 
 h 
 
 77 . l 77 . 7 7.6 . Q 
 
 77 . IO 
 
 
 
 
 
 
 
 a 
 
 17.2 17.0 16.8 
 
 17 . OO 
 
 
 
 
 
 
 
 Aai 
 
 9.2 9.3 9.9 
 
 9-47 
 
 
 
 
 
 
 
 E 
 
 14.. 1 14.8 17 O 
 
 I A 77 
 
 
 
 
 
 20 59 
 
 28 
 
 >, 
 
 12.2 12.9 13. I 
 
 12-73 
 
 
 
 
 
 
 
 
 
STELLAR PHOTOMETRY. 
 
 N 
 
 OS 
 
 PLATE 12. 
 
 -305 
 
 * 
 
 -I- to' 
 
 
 u 
 
 . 
 
 W 1 1 * S 
 
 V 
 
 5' 
 
 a,' 
 
 f. 
 
 . 
 
 Scale, i mm = 7". 2. 
 
 1902 January 
 
 R - A - 
 
 8518 Z CASSIOPEIA. 
 
 39 m 39 s -9- Dec. + 56 i' 33", 1900. 
 
CHAPTER XII. Z CASSIOPEIA. 163 
 
 TABLE 102. 8518 Z CASSIOPEIA. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1904 October i. 6-INCH. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 22 32 
 
 22 52 
 
 O 
 
 '7 
 15 
 
 E 
 
 A a i 
 D a i 
 a 
 d 
 b 
 h 
 h 
 b 
 d 
 a 
 
 D al 
 A 01 
 Eat 
 E 
 
 14.7 15.3 14.7 
 9.8 9.9 9.0 
 14.0 13.3 13.7 
 
 15-3 '5-9 15-7 
 38.2 38.3 38.1 
 28.4 27.9 28. I 
 37-9 38.2 38.6 
 38.3 38.7 39-0 
 28.2 29.1 28.3 
 38.9 39-1 39-o 
 16.8 16.3 16.3 
 14.2 13.8 13.7 
 9.9 10. i 9.1 
 
 2O.9 21 .3 22. O 
 
 13-4 H -o 13-3 
 
 14.90 
 9-57 
 13-67 
 15-63 
 38.20 
 28.13 
 38.23 
 38.67 
 
 28.53 
 39-00 
 16.47 
 13.90 
 9.70 
 
 21 .40 
 13-57 
 
 14.24 
 9.64 
 
 13-79 
 16.05 
 38.60 
 28.33 
 38.45 
 
 0.82 
 0.25 
 0.76 
 1.09 
 
 3-71 
 2.49 
 3-70 
 
 8.07 
 7-50 
 8.01 
 
 8-34 
 10.96 
 
 9-74 
 10-95 
 
 7.96 
 7-39 
 7.90 
 8.23 
 10.85 
 9-63 
 10.84 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 October 5. Floating clouds. 
 
 21 2O 
 
 21 37 
 
 27 
 25 
 
 A., 
 
 Eat 
 Dai 
 a 
 d 
 b 
 h 
 h 
 b 
 d 
 a 
 
 8.2 8.2 7.5 
 18.4 17.8 18.6 
 
 12.2 12.3 12. O 
 13-4 13-5 14 2 
 38.3 38.9 38.2 
 23-5 23.3 23.9 
 36.1 36.0 35.6 
 36.6 36.1 36.3 
 24.7 25.2 25.8 
 
 37-8 37 4 38 o 
 13 3 13-4 '3-3 
 
 7-97 
 18.27 
 12.17 
 13-70 
 38.47 
 23-57 
 35.90 
 36.33 
 25-23 
 37-73 
 13-33 
 
 
 O. 12 
 1.38 
 0.52 
 0.72 
 3.67 
 2.O7 
 3-42 
 
 7-55 
 8.81 
 
 7-95 
 8.15 
 
 II . IO 
 
 9 50 
 10.85 
 
 7-44 
 8.70 
 7.84 
 8.04 
 10.99 
 9-39 
 10.74 
 
 
 
 13-52 
 38.10 
 24.40 
 36.12 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 October 27. Fine. 
 
 20 34 
 
 20 57 
 
 33 
 29 
 
 Dai 
 
 E 
 Aai 
 
 a 
 d 
 b 
 h 
 h 
 b 
 d 
 a 
 Aai 
 Eat 
 E 
 
 Dai 
 Dai 
 
 15.2 14.9 14.9 
 13.0 13. i 13.0 
 8.7 9.4 8.8 
 14.7 14.9 15.1 
 38.6 39.2 39.3 
 24.3 25.2 24.9 
 38.2 37.7 37.0 
 37-7 37-6 37.8 
 27.7 27.1 27.2 
 
 39-5 39-7 39-2 
 15.1 14.6 15.1 
 9.2 9.0 9.0 
 
 20.0 19.3 19.7 
 
 12.9 '3-3 13 o 
 
 12.4 13.2 12.9 
 14.2 14.0 14. I 
 
 15.00 
 13 03 
 8.93 
 14.90 
 
 39-03 
 24.80 
 
 37.63 
 37.70 
 27-33 
 39-47 
 14-93 
 9.07 
 19.67 
 13-07 
 13-47 
 
 14.24 
 
 13-05 
 9.00 
 14.92 
 
 39-25 
 26.07 
 37.67 
 
 0.82 
 0.65 
 
 0.18 
 0-93 
 
 3-77 
 2.25 
 
 3-63 
 
 8.07 
 7.90 
 
 7-43 
 8.18 
 ii .02 
 9-50 
 10.88 
 
 7.96 
 7-79 
 7-32 
 8.07 
 10.91 
 9 39 
 10.77 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1-55 
 
 8.80 
 
 8.69 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
164 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 102. 8518 Z CASSIOPEIA. PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1904 September n. 12-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 19 26 
 
 19 50 
 
 
 
 4' 
 38 
 
 flai 
 
 k 
 
 e 
 
 g 
 v 
 d 
 b 
 h 
 h 
 b 
 d 
 
 V 
 
 g 
 e 
 k 
 <2ai 
 
 13-3 13-4 13-1 
 47-3 49-3 48-8 
 40. i 41 .0 40.9 
 37-7 38.2 38.3 
 49.1 47.4 47.2 
 
 3O.O 28.8 29. 2 
 
 18.0 18.8 18.2 
 26.1 26.5 27.3 
 27.5 27.7 27.0 
 18.7 19.0 18.0 
 30.4 30.0 30.1 
 47.8 48.1 48.8 
 39-3 39-0 39.0 
 41 .0 41 .0 40.4 
 
 46-5 47-7 48.3 
 13.5 13.6 14.1 
 
 I3-27 
 48.47 
 40.67 
 38.06 
 47.90 
 29.67 
 
 18-33 
 26.63 
 27-40 
 i8.57 
 30.17 
 48.23 
 39.10 
 40.80 
 47-50 
 13-73 
 
 13-50 
 47-99 
 40.74 
 38.58 
 48.07 
 29-92 
 18.45 
 27.02 
 
 0.85 
 4.62 
 3-86 
 3.61 
 
 4-63 
 2.64 
 1.50 
 2-38 
 
 9.17 
 12.94 
 12. 18 
 "93 
 J2.95 
 10.96 
 9.82 
 10.70 
 
 9.06 
 12.83 
 12.07 
 ii .82 
 12.84 
 10.85 
 9-7' 
 10.59 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 November 2. Fair to good, quiet, dull. 
 
 20 36 
 20 56 
 
 3i 
 29 
 
 a 
 d 
 b 
 h 
 e 
 k 
 S 
 
 ! 
 
 e 
 h 
 b 
 d 
 a 
 
 12. I II .2 12. O 
 
 35-o 35.0 35.0 
 
 24.3 22.9 23.3 
 
 32-7 31-5 32-5 
 47.7 48.6 47.2 
 
 57-7 59-7 57-3 
 43-3 44-o 43.8 
 44.8 44.0 44.3 
 59-2 57-8 59-9 
 46 . 1 45 . 2 46 . 8 
 34-0 33-o 31.8 
 23.2 23.6 23.2 
 35-0 34.8 34.2 
 12.3 11.5 u.i 
 
 11.77 
 35-00 
 23-50 
 32.23 
 47-83 
 58.23 
 43-70 
 44-37 
 58.97 
 46.03 
 
 32.93 
 23-33 
 34-67 
 11.63 
 
 11.70 
 
 34-84 
 23.42 
 32-58 
 46.93 
 58.60 
 44.04 
 
 0.63 
 3.18 
 2.06 
 2-93 
 4-51 
 5-43 
 4.22 
 
 8.38 
 10.93 
 9.81 
 10.68 
 
 12. 26 
 13.18 
 11.97 
 
 8.27 
 10.82 
 9.70 
 10.57 
 12.15 
 13-07 
 U.86 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 November 3. Twilight at beginning, good. 
 
 20 37 
 
 20 56 
 
 32 
 29 
 
 a 
 d 
 b 
 h 
 e 
 k 
 g 
 g 
 k 
 e 
 h 
 b 
 d 
 a 
 
 Oai 
 
 7.0 8.1 7.2 
 32.3 32.1 32.1 
 19.9 19.3 19.6 
 32.8 31.1 32.1 
 44.8 44.9 45.4 
 49-5 49-6 49.7 
 41.8 41.8 42.3 
 41.5 42.0 42.2 
 51.6 51.3 50.7 
 45-5 43-6 44.7 
 31.0 32.0 32.2 
 19.9 21.2 20.3 
 33-3 32-6 32.1 
 6.0 8.1 7.2 
 14-7 15-2 15.1 
 
 7-43 
 32-17 
 19.60 
 32.00 
 45-03 
 49.60 
 
 41-97 
 41.90 
 
 51 20 
 44.60 
 
 31-73 
 20.47 
 32.67 
 7.10 
 15.00 
 
 7-27 
 32-42 
 20.04 
 31-87 
 44.82 
 50.40 
 41.94 
 
 0.23 
 2.90 
 1.72 
 2.85 
 4-30 
 4.84 
 4.00 
 
 8.2 5 
 IO.92 
 
 9-74 
 10.87 
 12.32 
 12.86 
 
 12. 02 
 
 8.14 
 10.81 
 
 9-63 
 10.76 
 
 12.21 
 
 12-75 
 II .91 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER XII. Z CASSIOPEIA. 165 
 
 TABLE 102. 8518 Z CASSIOPEIA. PHOTOMETER MEASURES OF COMPARISON STARS. Continued. 
 
 1900 July 12. 40-INCH, WEDGE II. Moon. 
 
 Sidereal 
 Time. 
 
 Zen. 
 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 21 
 
 o 
 
 d 
 
 X 
 
 s 
 e 
 
 
 
 a 
 k 
 
 1 
 y. 
 
 h 
 
 11.2 16.0 14.0 15.2 
 
 34-4 3i-8 32-9 32-7 
 45.1 44.0 44.9 44.2 
 26.0 24.7 24.8 23. i 
 
 37 5 
 
 14. 10 
 32.95 
 44-55 
 24.65 
 37-5 
 35-20 
 28.48 
 
 34-95 
 30.60 
 11.38 
 
 
 0.56 
 3-07 
 4.46 
 
 2. 2O 
 3-65 
 3-4' 
 2.7O 
 3-38 
 
 10.87 
 13-38 
 14-77 
 12.51 
 13.96 
 13-72 
 13.01 
 >3 69 
 
 10.76 
 I3.27 
 14.66 
 I2.4O 
 
 13.85 
 I3.6l 
 I2.9O 
 
 I3.58 
 
 31-78 
 
 
 
 34-5 35-o 33.9 37.4 
 26.7 29.9 28.3 29.0 
 
 34-i 35-3 35-4 35-O 
 30.2 30.3 31.0 30.9 
 10.9 12.8 ii ,o 10.8 
 
 
 
 
 
 
 0.23 
 
 10.54 
 
 10.34 
 
 
 1900 October 24. WEDGE II. Seeing variable. 
 
 2 15 
 
 
 b 
 d 
 ? 
 P 
 
 V 
 
 n 
 e 
 k 
 g 
 
 e 
 n 
 
 V 
 
 P 
 I 
 
 15.0 17.1 15.7 
 28.2 27.7 28.7 
 
 54-5 53-3 53-5 
 55 o 53.1 55.0 
 53-o 55-3 5i-2 
 58-3 58.1 57-2 
 35-8 37.7 37.9 
 44-2 44-9 43-6 
 37-2 37-8 37.8 
 37-8 36-7 36-0 
 43-5 43-8 44-3 
 35 o 37.0 37.2 
 
 54-2 55-9 56.7 
 50 . o 49 o 51.2 
 50.2 52.1 51.1 
 49 9 52 4 50.0 
 24.3 27.2 28.2 
 
 <5-93 
 28.20 
 
 53-77 
 54-37 
 53-17 
 57.87 
 37-13 
 44.23 
 37.60 
 36.83 
 
 43.87 
 36.40 
 55-60 
 50.07 
 5i-i3 
 50-77 
 26.57 
 
 
 0.83 
 2.56 
 5-13 
 5-18 
 
 5-io 
 5-50 
 3-57 
 4.40 
 3-62 
 
 9-37 
 
 II . IO 
 
 13-67 
 13-72 
 13 64 
 14.04 
 
 12. II 
 12.94 
 12. 16 
 
 ' 9.26 
 10.99 
 I3.56 
 I3.6I 
 13-53 
 13-93 
 12. OO 
 12.83 
 12.05 
 
 27-39 
 52.27 
 
 52-75 
 51.62 
 
 56-74 
 36.77 
 44-05 
 37.22 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 January 3. WEDGE v. Good. 
 
 3 o 
 
 
 e 
 n 
 v 
 P 
 1 
 9 
 P 
 v 
 n 
 e 
 k 
 g 
 
 24.3 24.8 25.9 
 31-9 33 o 31.6 
 26.0 27.8 27.3 
 41.7 41.7 41.5 
 55-7 56.4 57-4 
 38.7 37-9 37-3 
 39-4 39-3 40.6 
 39-5 40.0 39.1 
 38.1 38.3 38.0 
 54.2 56.8 57.8 
 41.2 39. i 40.8 
 27-0 25.5 25.7 
 30.0 29.9 29.8 
 
 2O. 2 21.2 22.2 
 
 25.00 
 
 32.17 
 27.03 
 
 41-63 
 56-50 
 37-97 
 39-77 
 39-53 
 38-13 
 56.27 
 
 40.37 
 26.07 
 29.90 
 
 21 .20 
 
 23.10 
 31-04 
 26.55 
 41 .00 
 56.38 
 38.05 
 39-65 
 
 2.04 
 
 2.77 
 2-33 
 3-89 
 5-31 
 3-56 
 3-74 
 
 12. O6 
 12.79 
 12.35 
 13.91 
 15.33 
 I3-58 
 I3-/6 
 
 ii 95 
 12.68 
 12.24 
 13.80 
 15.22 
 '3-47 
 13-65 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
166 RESEARCHES IN ^STELLAR PHOTOMETRY. 
 
 TABLE 102. 8518 Z CASSIOPEIA. PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1905 January 7. WEDGE V. Clear, unsteady. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 h m 
 
 
 
 
 
 
 
 
 
 
 
 
 g 
 
 25-0 25.5 25.4 
 
 25-30 
 
 24.90 
 
 2.19 
 
 12.08 
 
 11.97 
 
 
 
 k 
 
 31-5 32-7 32-8 
 
 32.33 
 
 32.62 
 
 2-93 
 
 12.82 
 
 12.71 
 
 
 
 e 
 
 28.7 28.9 29.7 
 
 29. 10 
 
 27.52 
 
 2.42 
 
 12.31 
 
 12.20 
 
 
 
 n 
 
 41 .8 42.9 42.0 
 
 42.23 
 
 42.46 
 
 4-05 
 
 13-94 
 
 13-83 
 
 
 
 v 
 
 53-8 54-4 55-2 
 
 54-47 
 
 55-27 
 
 5-24 
 
 15.13 
 
 15.02 
 
 
 
 P 
 
 39-' 39-3 39-7 
 
 39-37 
 
 39-54 
 
 3-73 
 
 13.62 
 
 13.51 
 
 
 
 1 
 
 41.1 40 . 9 40 . 2 
 
 40-73 
 
 40.82 
 
 3-87 
 
 13-76 
 
 i3- 6 5 
 
 
 -.3 
 
 
 
 
 
 
 
 
 
 
 t) 
 
 1Q i 7Q 2 4.O 8 
 
 ^Q 7O 
 
 
 
 
 
 
 
 1) 
 
 SS 7 S6 2 S6 ^ 
 
 c6 O7 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 27Q251247 
 
 24. 6^ 
 
 
 
 
 
 
 
 k 
 
 2-3 . -J -12 5 ^2 . Q 
 
 12 OO 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3 24 
 
 
 5u 
 
 25.5 27-3 28-9 
 
 27.23 
 
 
 
 
 
 
 
 
 i 
 
 MAGNITUDE. 
 IS 14 13 IZ II 10 
 
 SO 
 
 85/8 Z CASSIOPCIAE.. 
 
 30 
 
 u 
 
 I- 
 u> 
 
 20 
 
 m 
 
 FIG. 34. MAGNITUDE-CURVE FOR Z CASSIOPEIA. 
 
CHAPTER XII. Z CASSIOPEIA. 
 
 167 
 
 TABLE 103. 8518 2, CASSIOPEIA. CONSTANTS FOR REDUCTION AND COMPARISON WITH 
 
 CATALOGUE MAGNITUDES. 
 
 6-INCH. 
 
 Star. 
 
 1904 September 5. 
 
 1904 October i. 
 
 C. 
 
 Obs. Mag. 
 
 A Mag. 
 
 C. 
 
 Obs. Mag. 
 
 A Mag. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 A ... 
 
 -0.51 
 
 0. 12 
 
 6.80 
 7-i9 
 
 6.69 
 7.08 
 
 + .32 
 -32 
 
 -f.n 
 
 . 12 
 
 0.50 
 
 O.OI 
 
 6.75 
 7.26 
 
 6.64 
 7-'5 
 
 + .27 
 -25 
 
 + .06 
 -05 
 
 D 
 
 Means . . . 
 
 
 7.00 
 7-3' 
 
 6.89 
 7.20 
 
 32 
 
 .12 
 
 0.25 
 
 7.00 
 7-25 
 
 6.89 
 
 7-i4 
 
 .26 
 
 .06 
 
 
 
 
 
 
 
 
 
 
 Star. 
 
 1904 October 5. 
 
 1904 October 27. 
 
 C. 
 
 Obs. Mag. 
 
 A Mag. 
 
 C. 
 
 Obs. Mag. 
 
 A Mag. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 A 
 
 -0.63 
 -0.23 
 
 6.80 
 
 7. 20 
 
 6.69 
 7.09 
 
 + .32 
 - 3i 
 
 + .11 
 . II 
 
 -0.57 
 0.07 
 
 6.68 
 7-32 
 
 6-57 
 7.21 
 
 + .20 
 - .19 
 
 .01 
 
 + .01 
 
 D 
 
 Means 
 
 -0.43 
 
 7.00 
 
 7-43 
 
 6. 
 7- 
 
 89 
 32 
 
 .32 
 
 ." 
 
 -0.25 
 
 7.00 
 7-25 
 
 6.89 
 7-14 
 
 .20 
 
 .OI 
 
 M n 
 
 
 
 
 
 
 
 
 12-INCH. 
 
 40-INCH. 
 
 *" (ffll 
 
 C. 
 
 
 Star. 
 
 Mag. 
 1 2-inch. 
 
 C. 
 
 h 
 Sept. n. Nov. 2. 
 
 Nov. 3. 
 
 July 12. 
 
 Oct. 24 
 
 Jan. 3. 
 
 Jan. 7. 
 
 a 82 
 
 9 o.oi 0.63 
 5 i . 50 2 . 06 
 5 2.64 3.18 
 i 2 . 38 2 . 93 
 
 0.23 
 1.72 
 2.90 
 2.85 
 
 d 
 e 
 h 
 k 
 
 
 
 10.94 
 12.25 
 
 10.75 
 12.99 
 11.97 
 
 0.56 
 
 2. 2O 
 0.23 
 2.70 
 
 
 
 
 
 
 3'57 
 
 2-33 
 
 2.42 
 
 j y ' 3 
 a ii c 
 
 
 
 
 4.40 
 3.62 
 
 2-77 
 2.04 
 
 2-93 
 
 2. 19 
 
 
 
 
 
 Mean C - . i 63 
 
 2. 2O 
 
 9-95 
 7-75 
 
 i-93 
 
 9-95 
 
 8.02 
 
 M 
 
 M 
 M 
 
 ean C 
 
 
 1.42 
 
 "73 
 10.31 
 
 3.86 
 12.40 
 8.54 
 
 2.38 
 12.40 
 
 IO.O2 
 
 2.51 
 12.40 
 9.89 
 
 Mean Mag. 9-95 9-9* 
 Mo .... 8 -*2 
 
 eanMag. 
 
 
 
 
 
 
i68 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 104. 8518 Z CASSIOPEIA. MEAN MAGNITUDES OP COMPARISON STARS. 
 
 6-INCH. 
 
 Star. 
 
 September 5. 
 
 October i. 
 
 October 5. 
 
 October 27. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 4 Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 J Mag. 
 
 A .. 
 D .. 
 
 Mean 
 
 a. . . 
 b.. . . 
 d... 
 h... 
 
 Mean 
 E... 
 
 6.80 
 7-19 
 
 + 0.04 
 -0.05 
 
 6.75 
 7.26 
 
 O.OI 
 + 0.02 
 
 6.80 
 7.20 
 
 + 0.04 
 0.04 
 
 6.68 
 7-32 
 
 -0.08 
 + 0.08 
 
 6.76 
 7-24 
 
 6.65 
 7-13 
 
 0.04 
 0.05 
 
 7.00 
 
 6.89 
 
 0.04 
 
 8.48 
 9.46 
 
 11-13 
 10.96 
 
 + 0.19 
 0.09 
 + 0.08 
 + 0.05 
 
 8-34 
 9-74 
 10.96 
 10.95 
 
 + 0.05 
 + 0.19 
 0.09 
 + 0.04 
 
 8.15 
 9-50 
 
 II . IO 
 
 10.85 
 
 o. 14 
 0.05 
 + 0.05 
 0.06 
 
 8.18 
 9-50 
 it .02 
 
 10.88 
 
 0. II 
 
 0.05 
 0.03 
 0.03 
 
 8.29 
 
 9-55 
 11.05 
 10.91 
 
 8.18 
 
 9-44 
 10.94 
 10. 80 
 
 0.12 
 
 0.09 
 0.06 
 
 0.04 
 
 9 95 
 8.04 
 
 9.84 
 7-93 
 
 0.08 
 0.08 
 
 8.15 
 
 + O.II 
 
 8.07 
 
 + 0.03 
 
 8.06 
 
 + O.O2 
 
 7.90 
 
 o. 14 
 
 12-INCH. 
 
 Star. 
 
 September n. 
 
 November 2. 
 
 November 3. 
 
 Mag. 
 
 d Mag. 
 
 Mean. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 a. . . 
 b... . 
 d. .. 
 h... 
 
 Mean 
 
 e .. . 
 g.... 
 k. .. 
 
 Mean 
 
 8.33 
 9.82 
 10.96 
 10.70 
 
 + O.OI 
 
 + 0.03 
 
 + 0.02 
 0.05 
 
 8.38 
 9.81 
 10.93 
 10.68 
 
 + 0.06 
 
 + O.O2 
 O.OI 
 
 0.07 
 
 8.25 
 
 9-74 
 10.92 
 10.87 
 
 0.07 
 0.05 
 
 O.02 
 + O. 12 
 
 
 
 8.32 
 9-79 
 10.94 
 
 10.75 
 
 8.21 
 
 9.68 
 10.83 
 10.64 
 
 0.05 
 0.03 
 0.02 
 0.08 
 
 
 
 
 
 
 
 
 
 9-95 
 
 9.84 
 
 0.04 
 
 12.18 
 
 ii-93 
 12.94 
 
 O.O7 
 O.O4 
 0.05 
 
 12.26 
 11.97 
 13.18 
 
 + O.OI 
 
 o.oo 
 
 +0.19 
 
 12.32 
 
 I 2. O2 
 
 12.86 
 
 + 0.07 
 + 0.05 
 -0.13 
 
 
 
 12.25 
 11.97 
 12.99 
 
 12. 14 
 
 11.86 
 12.88 
 
 0.05 
 0.03 
 
 0.12 
 
 
 
 
 
 
 
 12.40 
 
 12.29 
 
 0.07 
 
 
 
 
 
 
 
 
 
 40-INCH. 
 
 Star. 
 
 January 3. 
 
 January 7. 
 
 July 12. 
 
 October 24. 
 
 Mean. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 J Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 J Mag. 
 
 d 
 
 
 
 
 
 10.87 
 12.51 
 10.54 
 13.01 
 
 O. 12 
 + 0.19 
 
 II . IO 
 
 12. II 
 
 + O. 12 
 O.2I 
 
 10.98 
 12.32 
 
 (io.54 
 12.89 
 
 12. IO 
 
 10.87 
 
 12.21 
 
 10.43) 
 12.78 
 
 ii 99 
 
 0.12 . 
 
 O. II 
 
 0.08 
 0.04 
 
 e ... 
 
 h . . 
 
 12-35 
 
 + 0.03 
 
 12.31 
 
 O.OI 
 
 k. .. 
 g.... 
 
 Mean 
 
 n . . 
 
 P 
 q... . 
 x . 
 
 12.79 
 12.06 
 
 o. 10 
 0.04 
 
 12.82 
 12.08 
 
 0.07 
 
 O.O2 
 
 + 0. 12 
 
 12-94 
 
 12. 16 
 
 + 0.05 
 + 0.06 
 
 
 
 0.06 
 
 13-91 
 13-58 
 I3-76 
 
 0.05 
 0.06 
 + 0.04 
 
 '3-94 
 13.62 
 I3-76 
 
 O.O2 
 O.O2 
 + O.O4 
 
 
 
 14.04 
 13-72 
 13-67 
 
 + 0.08 
 + 0.08 
 0.05 
 
 
 
 13.96 
 13.64 
 13-72 
 (13.38 
 (13.96 
 
 13-85 
 13-53 
 13.61 
 
 13-27) 
 13-85) 
 
 0.05 
 0.05 
 0.04 
 
 
 
 13.69 
 13-38 
 I3-96 
 
 0.03 
 
 ... 
 
 
 
 
 
 
 
 
 Mean 
 
 
 
 
 
 
 
 
 
 
 0.05 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER XII. Z CASSIOPEIA. 
 
 I6 9 
 
 TABLE 105. 8518 Z CASSIOPEIA. VISUAL OBSERVATIONS OP THE VARIABLE. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 /. 
 
 JMag. 
 
 Month 
 and Day 
 
 [our 
 .S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 i 
 
 2 
 
 3 
 
 4 
 5 
 6 
 
 7 
 8 
 
 9 
 
 10 
 
 ii 
 
 12 
 
 13 
 14 
 15 
 16 
 
 17 
 
 18 
 
 19 
 20 
 
 21 
 22 
 23 
 24 
 25 
 26 
 
 27 
 28 
 29 
 3 
 31 
 32 
 
 33 
 34 
 35 
 36 
 37 
 38 
 39 
 
 40 
 4' 
 42 
 43 
 44 
 45 
 46 
 
 47 
 48 
 
 49 
 5 
 
 51 
 
 52 
 
 53 
 54 
 55 
 
 1898 
 Nov. ii 
 1899 
 Jan. 4 
 
 9 
 
 14 
 "9 
 
 24 
 Feb. 7 
 18 
 24 
 28 
 
 Mar. 7 
 
 13 
 
 28 
 Apr. 4 
 16 
 
 21 
 
 May 10 
 
 21 
 
 29 
 June 7 
 
 10 
 
 July 5 
 
 29 
 Aug. 10 
 26 
 Sept. 13 
 25 
 Oct. 2 
 7 
 
 21 
 24 
 
 Nov. 4 
 
 20 
 22 
 26 
 
 Dec. 4 
 19 
 
 23 
 
 1900 
 Jan. i 
 8 
 20 
 Feb. 4 
 10 
 
 22 
 25 
 26 
 
 Mar. 6 
 
 ii 
 
 '9 
 3" 
 
 Apr. 29 
 
 May 20 
 June 15 
 July 12 
 
 7 
 
 7 
 7 
 6 
 
 7 
 7 
 
 '{ 
 
 7 
 8 
 8 
 16 
 16 
 16 
 16 
 15 
 
 10 
 
 10 
 14 
 ii 
 
 10 
 
 9 
 9 
 8 
 
 7 
 8 
 
 7 
 8 
 8 
 
 2410000+ 
 4605.6 
 
 4659 
 4664.52! 
 
 4669.54 
 4674-54 
 4679.50 
 4693 52 
 4704.54 
 4710-54 
 47I4.54 
 47I4.55 
 4721-54 
 4727-56 
 4742 56 
 4749.92 
 4761.92 
 4766.92 
 4785-92 
 4796.88 
 4804.67 
 4813.67 
 4816.83 
 4841.71 
 4865.67 
 4877.63 
 4893.61 
 4911.58 
 4923.54 
 4930.58 
 
 4935 54 
 4949^6 
 4952 56 
 
 80 
 150 
 200 
 40 
 150 
 150 
 200 
 
 15 
 150 
 150 
 80 
 
 150 
 
 150 
 
 200 
 200 
 
 ISO 
 150 
 ISO 
 ISO 
 150 
 J5 
 15 
 150 
 
 200 
 
 150 
 200 
 200 
 
 2 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 photograph, dyv, vir 
 
 33-4, 32-5 
 
 33-0 
 
 34-4 
 32.9 
 
 32-4 
 31-9 
 3-4 
 
 29.4 
 29.8 
 
 <32 
 
 24.0 
 
 24-3 
 23-3 
 
 21. I 
 23 
 <23 
 <2I 
 <23 
 <23 
 <23 
 
 <23 
 <22 
 <22 
 <22 
 <22 
 <22 
 <22 
 <22 
 <2I 
 <22 
 <22 
 <22 
 
 ii. 3 
 
 II. IO 
 
 1 1 .29 
 
 11.32 
 ii .40 
 
 "45 
 11.68 
 ii .69 
 <n.4 
 
 12.31 
 
 12.27 
 12.38 
 12.64 
 
 12. 4 
 <I2.4 
 <I2.6 
 
 <I2.4 
 <I2.4 
 <I2.4 
 <I2.4 
 <I2.5 
 <I2.5 
 <I2.5 
 <I2.5 
 <I2.5 
 <I2-5 
 <I2.5 
 <I2.6 
 <I2.5 
 <I2.5 
 <I2-5 
 
 fair 
 
 fair 
 fair 
 good 
 good 
 
 o 
 
 54 
 59 
 
 64 
 69 
 
 74 
 88 
 
 99 
 
 + o.6 
 + 0.08 
 
 + 0.21 
 
 +0.17 
 + o. 19 
 +0.15 
 + o. 19 
 
 + O.O2 
 
 i>3-4', m'6e \ 
 
 
 m' is double, n and 12* ) 
 
 
 
 
 
 
 
 
 
 -IT A 28 I . .... 
 
 
 
 em, diov 
 vie, g4i>, diov 
 giv, ve, limit v 
 
 K4T, ve 
 62-3?, vk 
 
 22.1, 26.4 \ 
 24.1,23.5,26.4.: / 
 25-5, 23.1 
 23-5. 23.1 
 2O.6, 21.6 
 
 fair 
 
 fair 
 good 
 fair 
 poor 
 
 109 
 116 
 
 122 
 
 137 
 144 
 
 + 0.50 
 
 +0.30 
 +0.31 
 +0.37 
 
 0.0 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 7 
 7 
 
 7 
 7 
 7 
 6 
 
 7 
 
 7 
 . 7 
 9 
 7 
 7 
 9 
 7 
 7 
 8 
 8 
 
 7 
 8 
 
 15 
 
 14 
 9 
 13 
 
 4963-54 
 4979-52 
 4981.54 
 
 4985 54 
 4993 54 
 5008.50 
 5012.54 
 
 5021.52 
 5028.54 
 5040.62 
 5055-54 
 5061.54 
 5073-63 
 5 76 . 54 
 5077.54 
 5085 58 
 5092.58 
 
 5098.54 ' 
 5110-56 
 
 5139-88- 
 
 5160.83 
 5186.63 
 52I3-79 
 
 200 
 
 15 
 2OO 
 2OO 
 ISO 
 ISO 
 2OO 
 
 ISO 
 350 
 350 
 350 
 350 
 350 
 
 80 
 
 15 
 150 
 150 
 150 
 40 
 40 
 
 150 
 40 
 150 
 150 
 150 
 237 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 40 
 40 
 40 
 40 
 40 
 
 12 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 ( 
 6 
 40 
 
 
 
 <22 
 
 <23 
 <2I 
 <2I 
 <22 
 <22 
 <22 
 
 <2I 
 10.5 
 IO.O 
 
 13-7 
 18.0 
 
 24.3 
 27.2 
 
 25-5 
 34-0 
 39-5 
 40.4 
 
 42.1 
 
 40.0 
 
 38 9 
 34-7 
 29.1 
 
 <I2-5 
 <I2.4 
 <I2.5 
 <I2.5 
 <I2.4 
 <I2.4 
 <I2-4 
 
 <I2.5 
 
 13.83 
 13.90 
 13-48 
 13.0 
 
 12.27 
 
 11.97 
 
 12. I 
 
 11.15 
 10.50 
 
 10.39 
 
 10.19 
 
 10.44 
 
 10.60 
 11.08 
 11.72 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 moon 
 fair 
 fair 
 good 
 good 
 good 
 poor 
 good 
 fair 
 
 good 
 fair 
 
 good 
 
 good 
 poor 
 good 
 
 4 2 3 
 
 435 
 450 
 456 
 468 
 
 47' 
 472 
 480 
 487 
 
 i 
 13 
 
 42 
 
 63 
 89 
 116 
 
 +0.03 
 0.41 
 
 +0.58 
 
 + o.3 
 +0.27 
 
 + 0.18 
 + o.4 
 + 0.03 
 -0.37 
 0.28 
 
 -0.42 
 
 -0.45 
 
 -0.53 
 0.42 
 0.24 
 
 V2n, np, piq, qbs, s8i, tu. 
 XI-2V, T4-5, T>3p, piq, qi 
 1/3-41, k4.v, Ti8n 
 lift- Sx, v$k, vie, dicni 
 dSv, ryv, -vig, limit i<x. 
 g2v, limit v 
 dm, -zrjr 
 T3-4<*, V4h 
 63-47;, i'5<f 
 63?, v6d 
 6121;, v&d 
 6231% v6 8<f 
 641;, i/4& 
 6411, T3-4/, v$d 
 66i) , iijd, v^h 
 h2V, div, Vi,r 
 a,Ti, v6e 
 
 
 15.6, 12.5, 13.0 
 
 20.6, 17.6, 16.0. . . . 
 24.1, 24.6, 24.1, 24. 
 26.6, 27.5, 28.5 
 25.5 
 
 33-6, 34-5 
 38-1, 4'.o 
 40.6, 39.6 1 
 41.1, 40.6 i 
 42.6, 42.6 \ 
 41.6, 41.6 j 
 40.1, 41.0 J. 
 40.1, 40.5, 38.6. . . > 
 38.1, 37.6, 41.0. . . . 
 35-o, 33-6, 35-5 
 29.1, 29.1 
 
170 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 105. 8518 Z CASSIOPEIA- VISUAL OBSERVATIONS OF THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 J 
 
 Aperture. 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 J Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 56 
 57 
 58 
 59 
 60 
 61 
 
 62 
 63 
 
 64 
 65 
 
 66 
 
 67 
 68 
 69 
 
 70 
 
 7i 
 72 
 
 73 
 74 
 
 75 
 
 76 
 77 
 78 
 79 
 80 
 Si 
 
 82 
 
 83 
 84 
 85 
 86 
 
 8? 
 88 
 
 89 
 90 
 
 9i 
 92 
 
 93 
 94 
 95 
 96 
 
 97 
 98 
 
 99 
 
 IOO 
 IOI 
 
 1 02 
 
 103 
 
 1900 
 Aug. 6 
 
 14 
 28 
 Sept. 6 
 13 
 Oct. 4 
 
 16 
 
 24 
 1901 
 Feb. 9 
 Dec. 21 
 1902 
 Jan. 13 
 Oct. i 
 
 3i 
 Nov. 7 
 1903 
 Oct. 10 
 1904 
 Aug. 4 
 29 
 
 Sept. 5 
 ii 
 Oct. i 
 
 8 
 
 27 
 30 
 Nov. 2 
 6 
 '4 
 '90.S 
 Jan. 3 
 3 
 24 
 28 
 
 Feb. 9 
 
 25 
 Apr. 4 
 ii 
 30 
 May 22 
 June 4 
 13 
 27 
 July 23 
 
 3 
 
 Aug. 6 
 
 19 
 
 22 
 28 
 
 Sept. 17 
 
 Oct. 20 
 
 Nov. 21 
 
 9 
 8 
 8 
 ii 
 
 12 
 
 8 
 
 9 
 
 12 
 
 9 
 
 8 
 
 9 
 10 
 
 15 
 
 9 
 
 8 
 
 8 
 10 
 1 1 
 
 8 
 8 
 7 
 7 
 8 
 
 7 
 16 
 16 
 15 
 '4 
 H 
 14 
 '4 
 1 1 
 
 12 
 
 9 
 9 
 II 
 
 9 
 8 
 8 
 6 
 
 2410000+ 
 5238.63 
 5246.58 
 5260.58 
 5269.71 
 5276.75 
 5297-58 
 
 5309 63 
 53I7-75 
 
 5425-63 
 5740.58 
 
 5763 6 
 6024.63 
 6054.67 
 6061.88 
 
 6398 
 
 6697.63 
 6722.56 
 
 6729 
 6735-58 
 6755 67 
 
 6762.71 
 6781 
 6784 
 6787 
 6791 
 6799 
 
 6849.56 
 6849 . 56 
 6870.54 
 
 6874.54 
 
 6886 . 56 
 
 6902 . 52 
 6940.92 
 6947.92 
 6966.88 
 6988.83 
 7001.83 
 7010.83 
 7024.84 
 7050.71 
 
 7057-75 
 7064.63 
 7077-63 
 7080 . 7 i 
 7086 . 63 
 7106.58 
 7139-56 
 77'-5o 
 
 150 
 150 
 200 
 237 
 237 
 237 
 
 460 
 237 
 
 150 
 350 
 
 237 
 237 
 237 
 
 67 
 
 150 
 150 
 
 40 
 
 67 
 40 
 
 237 
 
 237 
 
 237 
 237 
 237 
 237 
 
 275 
 
 237 
 237 
 237 
 237 
 450 
 450 
 237 
 237 
 237 
 237 
 237 
 237 
 237 
 150 
 150 
 80 
 150 
 
 6 
 6 
 6 
 40 
 40 
 40 
 
 40 
 40 
 
 6 
 40 
 
 24 
 40 
 40 
 40 
 
 12 
 
 6 
 6 
 
 6 
 
 12 
 
 6 
 
 40 
 
 6 
 24 
 
 12 
 4 
 
 24 
 
 40 
 40 
 40 
 40 
 
 12 
 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 40 
 
 6 
 6 
 
 12 
 
 6 
 
 g3~ 41), i> limit 
 
 24.0 
 
 24.0 
 
 23-7 
 19.8 
 
 21. I 
 21.6 
 
 14-5 
 12.8 
 
 12.30 
 
 12.33 
 12.80 
 12.65 
 12.59 
 13-38 
 
 13-59 
 13-64 
 
 <I2.4 
 
 12.46 
 13-15 
 
 12. 2O 
 II .62 
 
 ii 49 
 
 <I2.8 
 
 12.22 
 12.40 
 
 <I2.4 
 
 12.95 
 <I2.4 
 
 I3.38 
 <I2.6 
 
 13.6 
 
 <I2.9 
 
 14.05 
 14.1 
 
 14.78 
 15.33 
 
 <i4-3 
 <i4-3 
 
 <I4 3 
 
 <H-3 
 <i4-3 
 <H 3 
 14.64 
 
 I3-70 
 13 63 
 13 43 
 13 35 
 13-5 
 13-38 
 13-35 
 ii-95 
 11.78 
 
 II. OO 
 
 10.31 
 10.51 
 
 II . 12 
 
 fair 
 good 
 good 
 fair 
 moon 
 fair 
 
 good 
 poor 
 
 fair 
 moon 
 
 poor 
 fair 
 fair 
 
 fair 
 good 
 
 good 
 good 
 good 
 
 good 
 fine 
 
 fair 
 fair 
 
 fair \ 
 good/ 
 fair 
 good 
 
 fair 
 
 good 
 good 
 fair 
 fair 
 fair 
 fair 
 good 
 good 
 fair 
 good 
 good 
 good 
 good 
 fair 
 fair 
 good 
 good 
 
 141 
 149 
 163 
 
 172 
 
 179 
 
 200 
 
 212 
 2 2O 
 
 151 
 174 
 
 435 
 465 
 472 
 
 124 
 149 
 
 162 
 189 
 
 21 I 
 
 218 
 
 226 
 
 2 7 6 
 
 393 
 
 4'5 
 428 
 
 437 
 45i 
 
 477 
 484 
 491 
 
 12 
 
 15 
 21 
 41 
 
 74 
 1 06 
 
 0.07 
 o. 16 
 + 0.05 
 -0.25 
 -0.42 
 0.07 
 
 0. 12 
 -0.25 
 
 O.06 
 + O.2I 
 
 -i.25 
 0.48 
 
 O.2I 
 
 + 0.13 
 O. IO 
 
 + 0.23 
 + 0.18 
 
 + O.2O 
 + 0.09 
 
 O.O6 
 
 O.OO 
 0.40 
 O.O2 
 O.OO 
 + 0.55 
 + 2. 10 
 + 2.42 
 + 2.65 
 
 + 1-34 
 + 1.15 
 + 0.32 
 
 -0.55 
 -0.77 
 0.65 
 
 g3D, ve, T>2k 
 41), km, limit v 
 
 CIV "V\X . 
 
 24.5 23.1, 23.6 
 19.1 20.6 
 
 22. I 2O. I 
 
 
 22 I 211 
 
 xyu, i>4<7 
 87), 1>4W, i)3/>, T>3q, x$-6v. . 
 photometer 
 
 I4.I 15.0 
 (13.6, 12.0, 13.0. .) 
 
 (140 1 1 6 y 
 
 
 v not seen limit e 
 
 
 <23 
 
 22.7 
 16.5 
 
 25.0 
 30.0 
 
 ve, V2k, 1)4-5 x 
 ksv, xyi, v 5-6 o 
 
 g2D, 1/1-20 
 
 D3g, v6e 
 photometer 
 
 23.1, 23.6, 21.6 
 
 16.6, 14.1, 18.7 
 25-5, 24.6 
 30.5,29-1 
 
 i) not seen, limit 2 < k 
 
 
 <20 
 
 24.8 
 23.1 
 
 <2 3 
 
 g3D, TI20 
 
 g4ii, eiv, Ti2k 
 (photometer, v not seen, 
 
 24-5,25-1 
 
 23.5, 22.1, 23.6 
 
 photometer 
 
 
 (photometer, v not seen, 
 
 
 <23 
 
 14.4 
 
 <2I 
 
 #681) k8v v&p 7)6o 
 
 10.1, 13.6, 18.0, 16.0 
 
 
 photographs 
 
 
 v not seen, limit 2 <C k 
 
 
 09 
 
 8.5 
 
 8 
 
 2.0 
 
 no-i7), 1*3-4.1 
 photographs DM 
 
 7-5, 9-5 
 
 m&Ti, p6v, u not seen 
 photometer 
 
 o.o, 4.0 
 
 
 
 < 6 
 < 6 
 
 < 6 
 
 < 6 
 < 6 
 < 6 
 4.0 
 ii. 5 
 
 12. 2 
 14.0 
 
 
 
 Jn glimpsed ? X3, limit 
 ( 45 < k 
 
 I 
 
 ) 
 
 
 xSn n2o w6j 
 
 
 q2n pin no, n^s 
 
 
 n$v, sv, -viu 
 
 3.0, 6.0, 2.5 
 
 II.O, I2.O, I2.O, IO.9 
 
 13-5, 10.5, 13-9, ii. i 
 
 15.0, 13.0, 14.1 
 
 112-317, i>2-3, 1/40, x(>v. . . . 
 1/4?, 7)5, xsv 
 photometer 
 
 1)40, 7)39, xdv 
 xyu, v^q 
 3:3-47;, us?, 1)50 
 D7-8:r, 11451;, 7)g, hS-iov. . 
 VIO-I2X, v^e, D2g, h&Ti. . . . 
 hi-v, d2-v, 7)8g 
 667), 1)6/1, v6d 
 v$d, v6h, b6v 
 dm, hiv 
 
 13.9, 14.0, II. I. . . . 
 14-', 15.0 
 
 13.6, 16.0, 14.9. . . . 
 24.6, 27.6, 27.5, 28.0 
 28, 28.1,29.5, 29 
 36.0, 34.4, 35 
 38.1, 42.0, 42.4. . . . 
 38.1, 43.0, 38.1. . . 
 32.1, 36.0 
 
 '3-4 
 14-5 
 14.8 
 
 27-3 
 28.8 
 
 35-2 
 40.8 
 39-3 
 34-o 
 
CHAPTER XII. Z CASSIOPEIA. 
 
 
 CO 
 Oi 
 
 00 
 N 
 
 2 
 
 CO 
 
 Co 
 
 I 
 
 tk 
 
 CO 
 C5 
 <i 
 
 3 
 
 S 
 
 
 UJ 
 
 o 
 o 
 
 01 
 
 o 
 
 
 
 0> 
 
 I 
 
 (X 
 
 I 
 
 
 
 FIG. 35. LIGHT-CURVE OK Z CASSIOPEIA 
 
172 
 
 RESEARCHES IN STELLAR PHOLOMETRY. 
 
 TABLE 106. 8518 Z CASSIOPEI.B. MEAN MAGNITUDES FROM 41 DAY GROUPS. 
 
 Group No. . . 
 I. D . . 
 
 i 
 4 1 
 
 2 
 82 
 
 3 
 123 
 
 4 
 164 
 
 5 
 205 
 
 6 
 
 246 
 
 7 
 287 
 
 8 
 328 
 
 9 
 369 
 
 IO 
 
 410 
 
 II 
 451 
 
 12 
 
 492 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 (I 
 
 o 
 
 64 
 
 IO7 
 
 1 4.0 
 
 
 
 
 
 
 
 4^6 
 
 472 
 
 M 
 
 ii 3 
 
 T I 71 
 
 I 2 O7 
 
 I 2 52 
 
 
 
 
 
 
 
 13. 74 
 
 II .83 
 
 m 
 
 -f o 6 
 
 + o 16 
 
 _f_O 26 
 
 + O 2 
 
 
 
 
 
 
 
 4-O "S4 
 
 -f o 14 
 
 No 
 
 
 c 
 
 I 
 
 2 
 
 
 
 
 
 
 
 2 
 
 6 
 
 !t 
 
 7 
 
 C2 
 
 IO2 
 
 I^I 
 
 184 
 
 216 
 
 
 
 
 
 
 
 M 
 
 
 
 
 12 48 
 
 12 87 
 
 1-262 
 
 
 
 
 
 
 
 JM 
 
 
 
 _ O 77 
 
 o 06 
 
 o 25 
 
 o 18 
 
 
 
 
 
 
 
 No 
 
 
 2 
 
 2 
 
 I 
 
 1 
 
 2 
 
 
 
 
 
 
 
 r t 
 
 
 
 
 TCI 
 
 
 
 
 
 
 
 A'l e: 
 
 468 
 
 M 
 
 
 
 
 
 It IS 
 
 
 
 
 
 
 12 2O 
 
 ii ^6 
 
 55 8 9 JM 
 
 
 
 
 o 06 
 
 -f-O 21 
 
 
 
 
 
 
 I 25 
 
 O 74. 
 
 I No. 
 
 
 
 
 I 
 
 I 
 
 
 
 
 
 
 I 
 
 2 
 
 f / 
 
 
 
 
 145 
 
 189 
 
 218 
 
 276 
 
 
 
 393 
 
 433 
 
 
 M 
 
 
 
 
 12 52 
 
 I-i-iS 
 
 T T OS 
 
 i s 06 
 
 
 
 
 T 7 E;-I 
 
 
 6 \ m 
 
 
 
 
 + o 09 
 
 fo 18 
 
 + O IO 
 
 + o 06 
 
 
 
 o oo 
 
 + o 04 
 
 
 I No. 
 
 
 
 
 3 
 
 i 
 
 3 
 
 i 
 
 
 
 i 
 
 4 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r t 
 
 Means \ * 
 L No. 
 
 5 
 10.63 
 0.03 
 
 3 
 
 61 
 11.08 
 
 O.O2 
 
 7 
 
 106 
 
 11.88 
 + 0.09 
 
 7 
 
 147 
 12.50 
 -f 0.05 
 
 9 
 
 185 
 
 13 3 
 0.05 
 
 5 
 
 217 
 13.82 
 
 O.OI 
 
 5 
 
 276 
 15.06 
 + 0.06 
 i 
 
 .... 
 
 
 393 
 
 14.64 
 o.oo 
 
 I 
 
 436 
 13-44 
 
 O.OI 
 8 
 
 471 
 
 II .76 
 
 O.02 
 
 8 
 
 IOO 
 
 ZOO 
 
 3OO 
 
 DAYS 
 
 44O 
 
 50O 
 
 600 
 
 to m 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1 " s ~ " 
 
 
 i * ^ 
 
 
 X 
 
 _ __ _j _ j _ ^ 
 
 
 H . . 
 
 -- 85/8 Z CAS$!QPIA / 
 
 " " 
 
 
 If \ 
 
 ^ ^ 
 
 r 
 
 "I 
 
 
 
 
 
 ^ 
 
 wax. .^>t^" -H- - 
 
 
 c 
 
 . - -~*r\ SJ 
 
 ^ 
 
 
 Af//7. = 329 \l\ 
 
 
 
 
 
 r 
 
 M- m /?</ ":;:*JL::::I 
 
 ^ 
 
 
 
 
 
 /? 
 
 v F* 
 
 ^ 
 
 
 
 
 
 
 
 ..&.. 
 
 
 
 
 
 
 
 
 
 
 
 -4 
 
 
 
 Q I . . 
 
 ^ 
 
 j 
 
 
 
 r 
 
 * 
 
 ^ 
 
 
 . - _ 
 
 
 
 
 / 3 
 
 V B . 
 
 .j . 
 
 3 
 
 Z 
 
 t 
 
 T 
 
 
 I) . 
 
 
 
 
 
 ::::i::iS: i :::::: 
 
 j 
 
 
 2 i:::::::::::::;::::;: 
 
 - - r - 
 
 
 ^_- 
 
 
 
 
 
 
 
 ] 
 
 - Si - 
 
 
 
 ;:: t 
 
 
 
 
 
 
 
 
 
 
 
 
 f 
 
 
 
 V 
 
 
 
 
 
 7 
 
 
 
 s 
 
 
 
 
 ^ 
 
 :: 5 
 
 
 
 
 
 
 
 c 
 
 t~ "iiniii: i.i 
 
 
 
 
 
 
 
 HI 1 
 
 __z it 
 
 
 
 
 
 
 
 * ^ 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 16 : 
 
 
 
 
 FIG. 36. MBAN LIGHT-CURVB OF Z CASSIOPBI.U. 
 
CHAPTER XII. Z CASSIOPEIA. 
 
 173 
 
 TABLE 107. 8518 Z CASSIOPEIA. OBSERVED MAXIMA AND MINIMA. 
 
 Elements of maximum. 1898 Nov. 22 (J. D. 2414617) + 492"1E. M-m=173. 
 
 MAXIMA. 
 
 MINIMA. 
 
 ja 
 
 o 
 
 a 
 
 M 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 i 
 
 w 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 o 
 i 
 
 2 
 
 4 
 
 1903 Nov. 2 7 
 1900 Apr. 3 
 1901 Aug. 1 8 
 1 904 Apr. 1 1 
 
 4622 
 5"3 
 5615 
 6582 
 
 10.7 
 
 IO.2O 
 
 me 
 me 
 
 10.6 
 10.09 
 
 + 5 
 + 4 
 + 14 
 - 3 
 
 9 
 35 
 
 i 
 
 4 
 
 I 
 
 2 
 
 3 
 5 
 
 1 899 Oct. 9 
 1901 Feb. 24 
 1902 June 2 
 1905 Feb. ii 
 
 4937 
 5440 
 5903 
 6888 
 
 me 
 me 
 me 
 15-18 
 
 
 + i 
 
 12 
 
 -17 
 -16 
 
 2 
 2 
 
 6 
 15 
 
 
 
 
 '5-07 
 
 
 The mean light-curve was formed from the observations up to 1905 June 
 27, and gives the mean period 492 days. The last minimum, 1905 February 16, 
 is the only one well covered by the observations. The five comparisons between 
 1905 January 24 and April n were made with difficulty, owing to the low posi- 
 tion of the field and the faintness of the variable, which seems to have been fainter 
 than the star n. On account of the difficulties mentioned, the stars n and s were 
 taken for the variable and n, but the real brightness of the variable is shown by 
 the observations of January 3 and April 30. The comparisons made in May, June, 
 and July show an unmistakable halt in the rise between the i3th and i4th magni- 
 tude, followed by a sudden increase of more than one magnitude between August 
 6 and 19. The corresponding rise in February, 1900, was less rapid. 
 
 The period 492 days satisfies the present series of observations, and there 
 seem to be no others for comparison until Hartwig's are published. 
 
CHAPTER XIII. 
 
 8629 Y CASSIOPEIA. 
 
 * 
 
 R. A. 23<58n> 135.8; Dec. +55 7' 35* (1900). 
 
 This variable was discovered by Mrs. Fleming in 1898 at Harvard, from the 
 bright hydrogen lines in its third type spectrum. H. C. O. Circular, No. 24, 
 states that there are 101 plates containing the field, so when these are measured 
 the variation of the star will be thoroughly known. The brighter stars in the 
 field were measured with the 6-inch in February and March, 1898, and the place 
 of the variable relative to the stars A and B (Cambridge A. G. catalogue) found 
 as given above. The stars b, e, and / were connected with the variable with the 
 micrometer on the 4O-inch in February, 1900. The star e was found to be double, 
 about i3th and i4th magnitude, position angle 198, distance 6".6. 
 
 Visual comparisons of the variable began in February, 1898, a little too late 
 to definitely fix the maximum, which the mean light-curve aids in placing at 
 March n, 9.4 magnitude on the Harvard scale. The decline following this maxi- 
 mum was followed with the 6- and 1 2-inch telescopes, and at the minimum the 
 star remained below the limit of the 6-inch for 91 days, from 1898 September 7 
 to December 7. The next maximum, 1899 April 8, was well covered with the 
 6-inch, and the variable was found at minimum with the 4o-inch, 1900 January 
 8 (minimum by mean curve, 1899 December 13). The adopted magnitude at 
 the next maximum would be 9.6 or 10.6, according to the weights given to the 
 discordant observations of June 15 and July 12. The probable course of the 
 variations from October, 1900, to August, 1904, is shown by the broken line in 
 fig. 38, fixed by the aid of the mean light -curve, guided by occasional observa- 
 tions sufficient to give the number of the epoch. From August, 1904, regular 
 comparisons fix the maximum of epoch 6 and the following minimum, and show 
 that the adopted period, 410 days, is substantially correct. 
 
 TABLE 108. 8629 Y CASSIOPEIA. STANDARD MAGNITUDB STARS. 
 
 Star. 
 
 B. D. No. 
 
 1900. 
 
 Color 
 P. DM. 
 
 Magnitude. 
 
 Residuals. 
 
 R. A. 
 
 Dec. 
 
 Catalogue. 
 
 Measured. 
 
 I''f m Cats. 
 
 3 
 Nights 
 inter 
 se. 
 
 H.C.O. 
 
 P. DM. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 C 
 F' 
 G 
 
 
 
 + 54 3109 
 + 55 355 
 + 55 3041 
 
 h m s 
 oo oo 30 
 
 23 5i 53 
 23 49 02 
 
 o / 
 
 + 55 09-2 
 + 55 17- 
 + 55 56.0 
 
 G- 
 WG 
 G 
 
 7 .11 
 7.01 
 7.48 
 
 7-05 
 6.57 
 7.16 
 
 7.29 
 6.88 
 7-43 
 
 7.02 
 6.61 
 7.16 
 
 + 18 
 -3 
 - 5 
 
 - 3 
 + 4 
 o 
 
 4 
 6 
 6 
 
 7.20 
 
 6-93 
 
 7.20 
 
 6.93 
 
 12 
 
 2 
 
 5 
 
 
 
 
 
 75 
 
1 7 6 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 MAGNITUDES OF COMPARISON STARS. 
 
 The standard magnitude stars in the two fields in the constellation Cassiopeia? 
 are distinguished from those in the other ten fields in that they are fainter in 
 the Harvard than in the Potsdam Catalogue. The difference is only o. n in 
 the Z Cassiopeia? field, where it might be partially accounted for by the use of 
 only two stars. But in this field, for three stars, the difference amounts to 
 0.27. That this is not accidental, nor entirely due to the star colors, is shown by 
 the standards in two " Rumford" fields, U and S Cassiopeiae, where the differences 
 are 0.16 and o.oi, respectively, so that the mean difference for the four fields 
 in this constellation is 0.14, as compared with +0.29 for the other ten fields 
 here considered. If the Harvard scale is adopted for this field the limit of vision 
 of the 6-inch becomes 13.53 from the star , an abnormally faint limit. 
 
 TABLE 109. 8629 Y CASSIOPEIA. COMPARISON STARS IN B. D. CATALOGUE. 
 
 
 B. D. 
 
 1855- 
 
 
 B. D. 
 
 1855- 
 
 btar. 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 otar. 
 
 No. 
 
 Mag. 
 
 R. A. 
 
 Dec. 
 
 
 O 
 
 
 h m s 
 
 O / 
 
 
 o 
 
 
 h m s 
 
 / 
 
 P 
 
 + 54 3096 
 
 9-5 
 
 23 54 45 
 
 + 54 38.5 
 
 .r 
 
 + 54 3102 
 
 9-5 
 
 23 55 42 
 
 + 54 45-6 
 
 
 
 + 54 3098 
 
 9i 
 
 23 54 55 
 
 + 54 36.7 
 
 A 
 
 + 54 3103 ' 
 
 79 
 
 23 56 2 
 
 + 54 44-9 
 
 I 
 
 + 54 3099 
 
 9-5 
 
 23 55 3 
 
 + 54 48.8 
 
 m 
 
 + 54 3'5 
 
 9-5 
 
 23 56 42 
 
 + 54 54-0 
 
 B 
 
 + 54 3ioi 
 
 8-3 
 
 23 55 '3 
 
 + 54 46.9 
 
 
 
 + 55 3078 
 
 9-i 
 
 23 56 4 
 
 + 55 13-3 
 
 TABLE no. COMPARISON STARS FOR Y CASSIOPEIA (IN ORDER OP RIGHT ASCENSION). 
 
 Star. 
 
 Coordinates from Variable. 
 
 Light 
 Scale, 
 Steps. 
 
 Magnitude. 
 
 R. A. 
 
 Dec. 
 
 Measured. 
 
 From Curve. 
 
 H. 
 
 P. 
 
 H 
 
 P. 
 
 P' 
 
 
 
 1 
 
 o' 
 B 
 k 
 h 
 s 
 P 
 
 I 
 d 
 
 1 
 
 2* 
 
 e 
 a 
 c 
 
 n 
 t 
 ft 
 m 
 
 r 
 
 n 
 
 -637 
 -536 
 -509 
 
 -457 
 -438 
 -397 
 -186 
 -125 
 
 122 
 122 
 - 8 7 
 
 + I 
 
 + 19 
 + 23 
 + 49 
 + 5i 
 + 54 
 + 60 
 
 + IIO 
 
 + 128 
 + 223 
 
 + 393 
 + 426 
 
 + 479 
 
 j 
 
 -74-3 
 -62.5 
 
 -59-4 
 -53-3 
 -5i-i 
 -46.4 
 -21.7 
 14.6 
 -14.2 
 -14.2 
 
 IO.2 
 + O.I 
 
 + 2.2 
 + 2. 7 
 + 5-7 
 
 + 6.0 
 + 6.3 
 + 7-0 
 
 + 12.8 
 
 + 14-9 
 + 26.0 
 
 + 45-8 
 + 49-7 
 + 55-9 
 
 ft 
 
 - 822 
 
 - 945 
 + 328 
 - 170 
 
 + 343 
 - 387 
 
 + 112 
 
 + 92 
 426 
 
 + 406 
 + 64 
 + 50 
 
 + 141 
 + 6 
 - 470 
 - 73 
 + 50 
 - 103 
 + in 
 + 497 
 - 505 
 + 1287 
 + 150 
 + 139 
 
 
 
 
 
 
 27.2 
 
 
 
 9-'7 
 
 8.90 
 
 23.2 
 
 9.87 
 
 9.60 
 
 
 
 4-4 
 7-i 
 
 8-35 
 
 IO. 10 
 
 8.08 
 9-83 
 
 13.09 
 12.60 
 
 12.82 
 12.33 
 
 6.0 
 
 19.6 
 10.8 
 7-8 
 
 0.0 
 
 5-9 
 
 2.1 
 I6. 3 
 
 12.82 
 10.46 
 
 "43 
 12.13 
 
 7-77 
 14.01 
 
 13-53 
 10.71 
 
 12-55 
 
 10. 19 
 n . 16 
 11.86 
 7-50 
 13-74 
 
 13.26 
 10.44 
 
 12.83 
 
 12.56 
 
 
 
 
 
 
 31-8 
 25.0 
 
 10.02 
 
 9-75 
 
 8.40 
 
 8.13 
 
 
 
 
 
 
 *The preceding component. 
 
STELLAR PHOTOMETRY. 
 
 + i 
 
 N 
 
 Om 
 
 PLATE 13. 
 
 n 
 
 .-P 
 
 d. 
 
 "e. J> 
 f-0 
 
 a ' 
 
 -.A < 
 
 t 
 
 +20' 
 
 +10' 
 
 o' 
 
 >P . 
 
 Scale, i mm= I3".6. 
 
 1902 August 15. 
 
 8629 Y CASSIOPEIA. 
 R. A. 2 3 h 5 8m I3 9 .8. Dec. +55 7' 25". 1900. 
 
CHAPTER XIII. Y CASSIOPEIA. 
 
 177 
 
 TABLE in. 8629 Y CASSIOPEIA. PHOTOMETER MEASURES OF COMPARISON STARS. 
 
 1904 October 6. 6-INCH. Fine. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings 
 
 C. 
 
 Magnitude. 
 
 Mean of 3 
 
 Mean of 6 
 
 H. 
 
 P. 
 
 h m 
 21 38 
 
 31 56 
 
 o 
 
 27 
 25 
 
 C al 
 m 
 
 V 
 
 A 
 B 
 I 
 
 F'a, 
 Gai 
 Goi 
 F'o- 
 
 l 
 
 B 
 A 
 m 
 Ca. 
 
 12.6 12.7 12. i 
 28.8 30.0 30.0 
 34-9 36-1 35-3 
 
 IO.2 IO.2 IO.O 
 
 15.1 15.0 15.0 
 28. I 28.0 27.9 
 
 IO.O IO.O 9.2 
 
 12.9 14-3 13-7 
 13.1 13.8 13.3 
 
 8.8 9.6 8.9 
 26. i 25.8 27.2 
 14.3 15.0 14.7 
 10.9 it. i 10.8 
 2 9- 7 30.0 29.0 
 
 12.2 II. 7 12. O 
 
 12.27 
 29.60 
 
 35-43 
 10.13 
 15-03 
 28.00 
 
 >3-63 
 '3 63 
 13 40 
 9. 10 
 26.37 
 14.67 
 10.93 
 29-57 
 11.97 
 
 12. 12 
 
 29-59 
 
 0.52 
 2.63 
 3 40 
 o-35 
 0.91 
 2.36 
 0.23 
 0.72 
 
 7.98 
 10.09 
 10.86 
 7.81 
 
 8-37 
 9.82 
 7.69 
 8.18 
 
 7-7i 
 9.82 
 10.59 
 
 7-54 
 8. 10 
 
 9 55 
 7-42 
 7-91 
 
 '0.53 
 14.85 
 27.19 
 9-42 
 13-52 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 October 15. Good 
 
 o 26 
 o 50 
 
 16 
 18 
 
 Gai 
 
 G 
 F'a, 
 
 I 
 B 
 s 
 A 
 m 
 C 
 C 
 m 
 v 
 A 
 B 
 I 
 
 F'a, 
 Gai 
 
 16.9 18.4 17.5 
 
 10.3 II .O II .2 
 
 10.8 11.3 10. 2 
 
 31.7 32.1 32.2 
 
 17.1 18.1 18.1 
 
 32-9 33 i 32-7 
 13.1 14.0 13.4 
 
 31-7 32-9 32-4 
 
 IO.O IO.O 9.2 
 
 10. i 8.9 9.7 
 
 32.0 33.6 33.4 
 
 35-6 36-1 34-7 
 15.0 13.9 14.7 
 18.3 18.0 18.2 
 31.0 30.7 31.1 
 13.4 12.6 12.8 
 17. i 16.4 16.9 
 
 17.60 
 10.83 
 10.77 
 32.00 
 
 '7-77 
 32.90 
 13-50 
 32.33 
 9-73 
 9-57 
 33 oo 
 
 35-47 
 14-53 
 18. 17 
 
 30.93 
 12.87 
 16.80 
 
 17.20 
 
 1.24 
 
 0-37 
 0.49 
 2.86 
 
 1-35 
 3 04 
 0.78 
 3 .02 
 0.25 
 
 8.28 
 7.41 
 
 7-53 
 9.90 
 
 8-39 
 10.08 
 7.82 
 10.06 
 7.29 
 
 8.01 
 
 7.14 
 7.26 
 9-63 
 
 8.12 
 
 9.81 
 7-55 
 9-79 
 7.02 
 
 ii .82 
 3'-47 
 17-97 
 
 14.02 
 32-67 
 9-65 
 
 
 
 
 
 
 3-40 
 
 10.44 
 
 10. 17 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 October 27. Fj ne 
 
 21 O 
 21 18 
 
 3i 
 28 
 
 Gai 
 F'a, 
 / 
 
 B 
 t 
 A 
 
 V 
 
 m 
 Ca, 
 Ca, 
 
 m 
 A 
 B 
 I 
 F'o, 
 <7a, 
 
 '2-7 13-7 13-6 
 
 9.6 8.6 9.2 
 27.5 28.0 27.6 
 13-7 13-9 13 6 
 27.8 28.0 29.0 
 9.1 10.4 9.8 
 23.2 24.4 24.0 
 28.0 28.2 28. i 
 12.9 12.9 13.8 
 13.3 14.0 12.8 
 29.0 28.5 29.3 
 9.6 10.3 ii . i 
 15.1 15.8 15.0 
 28.5 28.1 28.9 
 
 IO.O IO.I IO.I 
 
 13.2 13.0 13.8 
 
 13.33 
 9.13 
 27.70 
 
 13-73 
 28.27 
 
 9-77 
 23 - 8? 
 28.10 
 13.20 
 
 '3-37 
 28.93 
 
 10.33 
 15-30 
 28.50 
 10.07 
 13-33 
 
 13-33 
 9.62 
 28. 10 
 I4-52 
 
 0.68 
 0.25 
 
 2 -47 
 0.87 
 
 2-47 
 0.28 
 2.03 
 
 2-51 
 0.68 
 
 8.09 
 7.66 
 9.88 
 8.28 
 9.88 
 7.69 
 9-44 
 9-92 
 8.09 
 
 7.82 
 7-39 
 9.61 
 8.01 
 9.61 
 7.42 
 
 9-17 
 9-65 
 7.82 
 
 10.05 
 
 28.52 
 13-29 
 
178 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLB in. 8629 Y CASSIOPEIA. PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1904 September 2. 12-INCH. Good. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 P. 
 
 k m 
 '9 35 
 
 19 53 
 
 o 
 44 
 
 40 
 
 I 
 B 
 
 Bai 
 
 A at 
 V 
 b 
 
 d 
 c 
 m 
 m 
 c 
 d 
 b 
 A oi 
 
 Bai 
 
 B 
 I 
 
 20. o 20.9 21 .0 
 5.0 6.7 5.6 
 14.2 14.4 14.8 
 10. 7 10. i 10. i 
 36.2 36.8 36.9 
 27.9 28.0 28. i 
 35-o 35.1 35-o 
 30.0 29.3 30.2 
 22.0 23.1 23.1 
 23.2 22.9 23.6 
 31.0 30.9 29.9 
 36.6 36.4 36.2 
 26.1 28.7 26.9 
 9.0 10.1 10.0 
 14.0 15.1 14.9 
 6.7 7.2 6.7 
 20.7 20.7 20.3 
 
 20.63 
 5-77 
 H-47 
 10.30 
 36.63 
 28.00 
 35.03 
 29.83 
 22.73 
 23-23 
 30.60 
 36.40 
 
 27-23 
 9.70 
 14.67 
 6.87 
 20.57 
 
 20.60 
 6.32 
 
 '4-57 
 
 IO.OO 
 
 1.78 
 
 O.22 
 I .OO 
 
 0-44 
 3-40 
 2-43 
 3-27 
 2.67 
 
 2.OI 
 
 9.84 
 8.28 
 9.06 
 8.50 
 ii .46 
 10.49 
 "33 
 10.73 
 10.07 
 
 9-57 
 8.01 
 8.79 
 8.23 
 11.19 
 
 10.22 
 II .06 
 10.46 
 9.80 
 
 27.62 
 
 35.72 
 30.22 
 22.98 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 November 2. Fair, a little dull and unsteady. 
 
 21 1 
 
 21 24 
 
 3i 
 28 
 
 I 
 B 
 s 
 Aai 
 
 V 
 
 b 
 d 
 c 
 m 
 m 
 c 
 d 
 b 
 Aai 
 S 
 B 
 I 
 
 25.6 24.4 25.1 
 
 12. O 12. O II. 8 
 27.8 28.8 28.2 
 14.9 14.6 15.0 
 19.7 19.7 18.9 
 32.3 32.1 32.1 
 42.7 42.5 42.1 
 
 33 2 33 9 32.9 
 27.3 28.0 27.4 
 27.9 27.8 27.7 
 34.8 34.1 33.4 
 40.4 40.9 41 .6 
 32-1 33-3 32-8 
 12.8 12.4 13.3 
 29. i 29.2 28.7 
 
 12. I 12.6 12. I 
 26.6 27. I 26. I 
 
 25-03 
 "93 
 
 28.27 
 
 14-83 
 '9-43 
 32-17 
 42-43 
 33-33 
 27-57 
 27.80 
 34-10 
 40.97 
 
 32.73 
 12.83 
 29.00 
 12.27 
 26.70 
 
 25.87 
 
 12. IO 
 28.64 
 I3.83 
 
 2.27 
 0.69 
 2.52 
 0.90 
 1.64 
 2.90 
 
 3-97 
 3 05 
 2-43 
 
 9.87 
 8.29 
 
 IO. 12 
 8.50 
 9.24 
 10.50 
 
 "57 
 10.65 
 10.03 
 
 9.6o 
 8.02 
 9.85 
 8.23 
 
 8-97 
 10.23 
 11-30 
 10.33 
 9.76 
 
 32.45 
 41.70 
 
 33-72' 
 27.69 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1904 November 3. Good. 
 
 21 I 
 31 2O 
 
 30 
 28 
 
 m 
 c 
 d 
 b 
 V 
 A at 
 S 
 
 B 
 I 
 I 
 B 
 s 
 .Am 
 b 
 d 
 c 
 m 
 
 24-9 25.3 25.1 
 31-9 30.9 3I-I 
 
 36-5 37-6 36.7 
 28.0 28.7 27.8 
 16.2 16.6 16.4 
 
 IO.I IO. I 9.2 
 
 24.5 24.9 24.3 
 8.2 7.9 6.9 
 
 23.2 22.8 23.2 
 22.7 23.3 22.4 
 7.8 7.1 7.3 
 23.0 24.1 24.2 
 
 8.2 9.8 9.0 
 
 27.5 27.0 27.7 
 38.0 37.4 37.3 
 31.2 31.2 32.1 
 
 24.2 24.0 24.0 
 
 25.10 
 31-30 
 
 36-93 
 28.17 
 16.40 
 9.80 
 
 24-57 
 7.63 
 23-07 
 22.80 
 7.40 
 23-77 
 9.00 
 27.40 
 37-57 
 31-47 
 24.07 
 
 24-59 
 31-39 
 37-25 
 27-79 
 
 2.26 
 2.78 
 
 3-44 
 2.44 
 1.24 
 o-37 
 
 2. 12 
 O.2I 
 2.OI 
 
 IO.22 
 10.74 
 II .40 
 10.40 
 9.2O 
 
 8-33 
 IO.O8 
 
 8.17 
 9-97 
 
 9-95 
 10.47 
 11.13 
 10.13 
 
 8 93 
 8.06 
 9.81 
 7.90 
 9.80 
 
 9.40 
 
 24-15 
 7-52 
 22.94 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CHAPTER XIII. Y CASSIOPELE. 179 
 
 TABLE in. 8629 Y CASSIOPEIA PHOTOMETER MEASURES OP COMPARISON STARS. Continued. 
 
 1902 December 26. 40-INCH. Clear, unsteady. 
 
 Sidereal 
 Time. 
 
 Zen. 
 Dist. 
 
 Star. 
 
 Scale Readings. 
 
 Mean Scale Readings. 
 
 C. 
 
 Magnitude. 
 
 Mean of 3. 
 
 Mean of 6. 
 
 H. 
 
 p. 
 
 h m 
 
 4 25 
 
 O 
 
 c 
 d 
 b 
 
 V 
 
 } 
 a 
 a 
 
 b 
 d 
 c 
 
 16.9 18.5 17.9 
 25.0 24.3 25.0 
 12.8 12.9 13.4 
 30.7 30.1 31.0 
 30.8 32.1 31.9 
 44.8 43.8 43.7 
 44-7 44-4 44-2 
 29-8 30.7 30.9 
 14.3 12.6 13.8 
 25.8 26.4 26.3 
 19.2 18.5 19.3 
 
 17-77 
 24-77 
 13-03 
 30.60 
 31.60 
 44.10 
 44-43 
 30-47 
 13-57 
 26. 17 
 19.00 
 
 18-39 
 25-47 
 13-30 
 
 1.49 
 
 2.24 
 0.82 
 2.71 
 2.76 
 4-25 
 
 10.84 
 
 "59 
 10. 17 
 12.06 
 
 12. II 
 13.60 
 
 10.57 
 11.32 
 9.90 
 11.79 
 11.85 
 13.33 
 
 31.04 
 44-27 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 January 7. Clear, unsteady. 
 
 4 6 
 
 42 
 
 c 
 d 
 b 
 
 f 
 a 
 a 
 Vai 
 
 b 
 d 
 c 
 
 14.0 14.9 15.3 
 
 21.9 21 .8 22.2 
 
 7.2 8.6 9.1 
 
 26.2 29.3 28.7 
 
 36.3 37-1 37-7 
 37-3 37-5 38-1 
 16.1 16.0 14.8 
 28.3 28.6 29.0 
 ii. o 9.2 10.3 
 
 24.6 22.2 24.5 
 
 13.9 16.3 16.1 
 
 14-73 
 21-97 
 8.30 
 28.07 
 37-03 
 37.63 
 15-63 
 28.63 
 10. 17 
 
 23-77 
 15.10 
 
 14.92 
 22.87 
 9.24 
 28.35 
 37-33 
 
 1 .04 
 2.06 
 
 0.37 
 2.50 
 
 3-47 
 
 10.75 
 11-77 
 IO.O8 
 12 .21 
 I3.I8 
 
 10.48 
 11.50 
 9.81 
 11.94 
 
 12.91 
 
 
 1-15 
 
 10.86 
 
 10.59 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1905 January 28. Good. 
 
 4 10 
 
 4 20 
 
 44 
 
 c 
 
 d 
 b 
 
 v 
 
 ! 
 
 a 
 a 
 
 f 
 u 
 b 
 d 
 c 
 g 
 
 13.2 13.8 12.8 
 
 20.3 20.3 21. I 
 
 4-8 7-9 8.3 
 9.2 8.1 8.2 
 
 22.8 25.7 24.9 
 
 38.3 37 2 37.3 
 
 36.4 36.9 36.0 
 25.2 24.4 24.1 
 
 7.4 8.2 8.1 
 7-3 7-8 8.3 
 18.8 20.2 19.5 
 
 12. I 13.7 12.3 
 
 24.1 23.7 24.0 
 
 13-93 
 20.57 
 7.00 
 8.50 
 
 24-47 
 37.60 
 
 36-43 
 24-57 
 7.90 
 7.80 
 19-50 
 12.70 
 23-93 
 
 I3-32 
 20.04 
 7.40 
 
 8.20 
 
 24-52 
 37.02 
 
 0.83 
 1.72 
 
 O.2O 
 
 o. 26 
 
 2.17 
 
 3-44 
 
 10.78 
 ii .67 
 10.15 
 
 10.21 
 12. 12 
 13-39 
 
 10.51 
 II .40 
 
 9.88 
 
 9 94 
 11.85 
 13.12 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 2. 2O 
 
 12.15 
 
 11.88 
 
 
 1900 July 12. WEDGE II. Fair, moon. 
 
 22 2O 
 
 
 b 
 
 I 
 d 
 c 
 
 9 
 
 z 
 a 
 
 f 
 
 V 
 
 13-2 15-5 13-0 I 
 ii. 8 ii. 8 > 
 24.0 25.8 28.0 I 
 
 13.06 
 26.20 
 25-05 
 16.88 
 
 32.93 
 43-5 
 43-20 
 
 26.53 
 15-55 
 
 
 0.42 
 
 2-44 
 2.26 
 I .OO 
 
 3-19 
 4-32 
 4-30 
 
 10.06 
 12.08 
 II .90 
 10.64 
 
 12.83 
 13-96 
 13-94 
 
 9-79 
 IX. 8l 
 
 11.63 
 10.37 
 
 12.56 
 13.69 
 13-67 
 
 26.36 
 
 24.7 26.0 25.1 ) 
 
 
 17.0 16. i 16.4 \ 
 18.0 ) 
 
 
 34.0 32.4 33.0 ) 
 32-3 > 
 43 5 
 
 
 43-7 45-o 43-7 I 
 42 4 ) 
 
 
 
 24.0 27.7 29.2 ) 
 
 2s 2 . . . . . f 
 
 
 0.77 
 
 10.41 
 
 10. 14 
 
 15-9 15-2 .... 
 
 
iSo 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 112. 8629 Y CASSIOPEIA. CONSTANTS FOR REDUCTION AND COMPARISON WITH CATALOGUE 
 
 MAGNITUDES. 
 
 6-INCH. 
 
 1904 October 6. 
 
 1904 October 15. 
 
 1904 October 27. 
 
 Star. 
 
 C. 
 
 Obs. Mag. 
 
 H. P. 
 
 A Mag. 
 
 H. 
 
 C. 
 
 Obs. Mag. 
 
 H. 
 
 P. 
 
 A Mag. 
 
 H. 
 
 P. 
 
 C. 
 
 Obs. Mag. | A Mag. 
 
 H. 
 
 P. 
 
 H. 
 
 P. 
 
 C.... 
 F' .... 
 G.... 
 
 -0.23 
 -0.52 
 -0.03 
 
 7-23 
 6 94 
 
 7-43 
 
 6.96 + .12 
 6.67! .07 
 7.l6; -.05 
 
 -.09 
 
 + .10 
 
 .OO 
 
 0.25 
 
 -O.26 
 
 0.49 
 
 7.29 
 6.78 
 
 7-53 
 
 7.02 
 
 6.51 
 7.26 
 
 + .18 
 -23 
 + .05 
 
 - 03 
 -.06 
 + .10 
 
 -0.07 
 -0.50 
 -0.07 
 
 7-34 
 6.91 
 
 7-34 
 
 7.07 +.23 
 6.64 . 10 
 7.071- .14 
 
 + .02 
 + .0 7 
 -.09 
 
 Means 
 
 Mo.., 
 
 O. 26 
 
 2O6 
 
 7 
 7.46 
 
 93-8 
 7.19 
 
 .06 
 
 o. 16 
 
 7.20 
 7.04 
 
 6-93 
 6.77 
 
 .'5 
 
 .06 
 
 7-206.93 
 7-4 1 7- '4 
 
 .16 
 
 .06 
 
 12-INCH. 
 
 Star. 
 
 Mag. 
 6-inch. 
 
 A 
 B. 
 
 I . 
 
 Mean C . . . . 
 Mean Mag.. 
 M .. 
 
 7-77 
 8-35 
 9.87 
 
 IO.O2 
 
 8.96 
 
 C. 
 
 Sept. 2. Nov. 2. Nov. 3 
 
 -0.40 
 
 O.22 
 
 1.78 
 
 2.OI 
 
 0.90 
 8.96 
 8.06 
 
 0.06 
 0.69 
 
 2.27 
 
 2.43 
 
 1.36 
 
 8.96 
 7.60 
 
 -0.47 
 
 O.2I 
 2.OI 
 2.26 
 
 I. 21 
 8.96 
 7.96 
 
 40-INCH. 
 
 Star. 
 
 Mag. 
 i z-inch 
 
 10.46 
 10.71 
 "43 
 
 Mean C. . 
 
 Mean Mag . I 10. 87 
 
 If... 
 
 C. 
 
 Dec. 26. Jan. 7. July 12. Jan. 28 
 
 0.82 
 1.49 
 
 2.24 
 
 1-52 
 
 10.87 
 
 9-35 
 
 0-37 
 1.04 
 2.06 
 
 1.16 
 
 10.87 
 
 9.71 
 
 0.42 
 i .00 
 2.26 
 
 1.23 
 
 10.87 
 
 9.64 
 
 O.20 
 0.83 
 1.72 
 
 0.92 
 10.87 
 
 9-95 
 
 MASNITUOE 
 
 tf 5/4/3 1 
 JO -- 
 
 :::::::::::: 86^9 Y CASSIOPF/AC 
 
 to i - _ : 
 
 > [-| 1 1 
 
 ^ // to 9 5 
 
 1 1*^ ~~~ 
 
 
 10 -- - - I ,- 
 
 lliililiiiiliii 
 
 . ^ 
 
 ~ P* 
 
 
 FIG. 37. MAGNITUDE-CURVE FOR Y CASSIOPEIA. 
 
CHAPTER XIII. Y CASSIOPELE. 
 
 181 
 
 TABLE 113. 8629 Y CASSIOPEIA. MEAN MAGNITUDES OP COMPARISON STARS. 
 
 6-INCH. 
 
 Star. 
 
 October 
 
 6. 
 
 October 15. 
 
 October 27. 
 
 Mean. 
 
 Mag. 
 
 A 
 
 Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 c 
 
 7.23 
 6.94 
 
 7-43 
 
 0.06 
 + 0.06 
 o.oo 
 
 7.29 
 6.78 
 7-53 
 
 o.oo 
 
 O. IO 
 + O. IO 
 
 7-34 
 6.91 
 
 7-34 
 
 + 0.05 
 + 0.03 
 0.09 
 
 7.29 
 
 6.88 
 7-43 
 
 7.02 
 6.61 
 7.16 
 
 0.04 
 0.06 
 0.06 
 
 F' 
 
 G 
 
 Mean 
 
 7.20 
 
 6-93 
 
 0.05 
 
 A 
 
 7.81 
 
 8-37 
 9.82 
 10.09 
 
 +0.04 
 
 + O.O2 
 0.05 
 + 0.07 
 
 7.82 
 
 8-39 
 9.90 
 jo. 06 
 10.08 
 
 +0.05 
 +0.04 
 +0.03 
 + 0.04 
 
 + O. IO 
 
 7.69 
 8.28 
 9.88 
 9.92 
 9.83 
 
 -0.08 
 0.07 
 
 + O.OI 
 O.IO 
 O. IO 
 
 7-77 
 8-35 
 9.87 
 
 10. O2 
 
 9.98 
 
 7-50 
 8.08 
 9.60 
 
 9-75 
 9.71 
 
 0.06 
 0.04 
 0.03 
 0.07 
 
 0.10 
 
 B 
 
 / 
 
 
 s 
 
 
 
 
 9.00 
 
 8-73 
 
 0.06 
 
 
 
 
 
 
 
 
 12-INCH. 
 
 Star. 
 
 September 2. 
 
 November 2. 
 
 November 3. 
 
 Mean. 
 
 Mag. 
 
 A 
 
 Mag. 
 
 Mag. 
 
 JMag. 
 
 Mag. 
 
 A Mag. 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 A 
 
 7.66 
 8.28 
 9.84 
 10.07 
 
 + 0.06 
 + 0.03 
 0.05 
 0.04 
 
 7.66 
 8.29 
 9.87 
 10.03 
 
 +0.06 
 + 0.04 
 
 O.O2 
 -0.08 
 
 7-49 
 8.17 
 
 9-97 
 
 IO.22 
 
 O. II 
 
 + 0.08 
 + 0.08 
 
 + O.II 
 
 7.60 
 8.25 
 9.89 
 
 10. 11 
 
 7-33 
 7-97 
 9.62 
 9.84 
 
 0.08 
 0.05 
 0.05 
 0.08 
 
 B 
 
 / 
 
 
 
 8.96 
 
 8.69 
 
 0.06 
 
 b 
 
 10.49 
 10.73 
 "33 
 
 + 0.03 
 
 + O.O2 
 O.IO 
 
 10.50 
 10.65 
 11-57 
 
 10. 12 
 
 + 0.04 
 O.O6 
 + 0.14 
 + O.O2 
 
 10.40 
 10.74 
 II .40 
 10.08 
 
 0.06 
 +0.03 
 0.03 
 
 O.O2 
 
 10.46 
 10.71 
 >i-43 
 
 IO. IO 
 
 10. 19 
 10.44 
 ii . 16 
 9.83 
 
 0.04 
 0.04 
 0.09 
 
 0.02 
 
 c 
 
 d 
 
 
 
 
 
 10.68 
 
 10.41 
 
 0.05 
 
 
 
 
 
 
 
 
 40-INCH. 
 
 December 26. January 7. July 
 
 Qfnr 
 
 12. 
 
 January 28. 
 
 Mean. 
 
 Mag. A Mag. Mag. 
 
 A Mag. Mag. 
 
 d Mag 
 
 Mag. 
 
 A Mag 
 
 Mag. H. 
 
 Mag. P. 
 
 A Mag. 
 
 b.... 10.17 +0.05 10.08 
 c... 10.84 +0.09 10.75 
 d... 11.59 0.14 11.77 
 
 0.04 10.06 
 o.oo 10.64 
 + 0.04 11.90 
 
 O.O2 
 O.II 
 
 + 0.17 
 
 10.15 
 10.78 
 ii .67 
 
 + 0.03 
 + 0.03 
 0.06 
 
 IO. 12 
 10.75 
 
 ii 73 
 
 9-85 
 10.48 
 ii .46 
 
 0.04 
 0.06 
 
 O. IO 
 
 10.87 
 
 10.60 
 
 0.07 
 
 /. . . 12. II O.O2 12.21 
 
 a... 13.60 +0.07 13.18 
 
 + 0.08 12.0 
 -0-35 13-9 
 
 12.8 
 
 S 
 
 I 
 I 
 
 0.05 
 + 0.39 
 -0-34 
 
 12. 12 
 
 13-39 
 12.15 
 
 O.OI 
 
 0.14 
 
 -0-34 
 
 12.13 
 
 13.53 
 
 12. 5 
 
 11.86 
 13.26 
 
 12. 2 
 
 0.04 
 0.24 
 
 
 
 
 
 0.14 
 
 
 
 
 
 
 
 
182 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABLE 114. 8629 Y CASSIOPEIA. VISUAL OBSERVATIONS OP THE VARIABLE. 
 
 No. 
 
 Date. 
 
 Ocular. 
 
 3 
 & 
 
 Comparisons. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 A Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C.S.T. 
 
 Julian 
 Day 
 G. M. T. 
 
 Steps. 
 
 Mag. 
 
 i 
 
 2 
 
 3 
 
 4 
 
 5 
 6 
 
 7 
 8 
 
 9 
 
 IO 
 
 ii 
 
 12 
 13 
 14 
 
 15 
 16 
 
 17 
 18 
 
 19 
 20 
 
 21 
 22 
 23 
 24 
 25 
 26 
 
 27 
 28 
 29 
 30 
 31 
 32 
 
 33 
 34 
 35 
 36 
 
 37 
 
 38 
 39 
 40 
 
 41 
 42 
 43 
 44 
 45 
 46 
 
 47 
 48 
 49 
 50 
 51 
 52 
 53 
 
 1898 
 Feb. 15 
 
 23 
 
 24 
 Mar. 4 
 
 5 
 "3 
 16 
 
 23 
 28 
 
 Apr. 6 
 20 
 
 25 
 June 21 
 
 July 6 
 
 Aug. i 
 
 9 
 18 
 Sept. 7 
 Oct. 5 
 Nov. 5 
 19 
 30 
 Dec. 7 
 
 IO 
 
 26 
 
 3 
 1899 
 Jan. 6 
 H 
 27 
 Feb. 7 
 28 
 Mar. 7 
 
 13 
 28 
 Apr. 4 
 16 
 
 May i 
 
 21 
 
 June 7 
 15 
 July 5 
 ii 
 
 Aug. 6 
 26 
 Sept. 13 
 26 
 Oct. 2 
 Nov. 6 
 20 
 27 
 Dec. 6 
 
 8 
 7 
 7 
 
 7 
 
 7 
 7 
 
 7 
 7 
 7 
 
 7 
 8 
 9 
 13 
 1 1 
 ii 
 9 
 
 IO 
 
 9 
 
 8 
 
 7 
 7 
 7 
 7 
 6 
 8 
 7 
 
 7 
 7 
 6 
 
 7 
 8 
 
 7 
 8 
 8 
 8 
 16 
 
 16 
 
 14 
 
 IO 
 IO 
 IO 
 IO 
 10 
 IO 
 
 9 
 9 
 
 8 
 7 
 8 
 
 7 
 7 
 7 
 7 
 
 2410000+ 
 4336.58 
 
 4344-54 
 4345 54 
 
 4353-54 { 
 
 4354-54 
 4362 . 54 
 
 4365.54 { 
 4372 54 
 4377-54 | 
 
 4386.54 -j 
 
 4400.58 
 4405 . 60 
 4462 . 79 
 
 4477-71 -j 
 
 4503-7I 
 4511-63 
 4520.67 
 4540.63 
 4568.58 
 4599-54 
 46I3-54 
 4624.52 
 
 4 6 3i.54 
 4634-50 
 4650.58 
 4654-54 
 
 4661 .52 
 4669 . 54 
 4682.50 
 
 4693-54 
 4714.58 
 
 4721-54 
 
 4727-58 
 
 4749-58 
 4761.92 
 
 4776.92 
 
 4796.83 
 4804.67 
 4813-67 
 4821.65 
 4841.65 
 4847.65 
 4853-65 
 4873-63 
 4893 60 
 4911.56 
 4924-54 
 4930.58 
 4965 - 54 
 4979-54 
 4986.54 
 
 4995 54 
 
 150 
 150 
 
 150 
 40 
 80 
 150 
 40 
 150 
 150 
 40 
 150 
 40 
 150 
 150 
 150 
 80 
 
 275 
 
 175 
 275 
 150 
 150 
 150 
 200 
 150 
 200 
 200 
 200 
 200 
 
 200 
 200 
 150 
 
 200 
 150 
 150 
 150 
 
 40 
 40 
 40 
 
 40 
 
 150 
 150 
 150 
 150 
 150 
 150 
 'So 
 150 
 150 
 150 
 
 200 
 200 
 150 
 200 
 
 6 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 12 
 
 12 
 
 8 
 
 12 
 12 
 12 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 6 
 
 6 
 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 6 
 
 
 
 21.6 
 21.6 
 
 25.0 
 
 24-3 
 25-6 
 23-9 
 
 25-5 
 24.9 
 24.4 
 
 21.6 
 
 20.9 
 18.4 
 ii. 5 
 6.1. 
 
 5-2 
 
 3-7 
 36 
 1.6 
 < o 
 < i 
 < o 
 < o 
 
 31 
 
 2. I 
 
 10.07 
 10.07 
 9-50 
 9.61 
 
 9-43 
 9.70 
 
 9-43 
 9-53 
 9.60 
 
 10.07 
 
 10. 19 
 10.61 
 11.80 
 
 12.79 
 
 12-95 
 13-14 
 13-15 
 13.60 
 
 <'3-9 
 <i3-7 
 <i3-9 
 <i3-9 
 13-33 
 I3-50 
 
 good 
 
 good 
 
 fair 
 good 
 
 good 
 good 
 good 
 
 fair 
 
 fair 
 fair 
 good 
 
 good 
 
 moon 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 good 
 
 o 
 8 
 9 
 
 17 
 18 
 26 
 
 29 
 36 
 
 50 
 
 64 
 69 
 126 
 
 141 
 
 167 
 175 
 184 
 204 
 
 295 
 298 
 
 + 0.32 
 + 0.37 
 
 0.2O 
 
 O. 12 
 
 -0.31 
 -0.13 
 
 0.46 
 
 -0-45 
 0.50 
 
 O.2O 
 -0.44 
 
 o. 16 
 0.62 
 
 +0.08 
 
 o. 16 
 0.07 
 o. 18 
 
 + 0.10 
 
 -0-34 
 -0.15 
 
 
 (1/26, bic, c6d, d.5/, J2e. . . 1 
 \d2h hig g2k g2/ j 
 
 f 23.6, 25.2, 26.5. . ) 
 
 1 2*1 2 24 Q . . . . ( 
 
 1/46, v2l, iii-2m, 0211, nip. . 
 
 112-2,1, mo-iv, 1/3-46 
 ov, V2p, 112-2,1, D2-yi 
 
 25.7, 24.5, 23.1. ..(, 
 27.2, 25.9, 25.7. . .) 
 25.2, 26.5, 27.2, 23.6 
 25.2, 22.6, 24.0 
 26.2, 27.0, 26.2 . . . ) 
 23.6, 24.0, 26.2. . . ) 
 26.2, 25.0, 23.6 
 23.2, 24.9, 27.0. . . J 
 
 25.5, 21.6 > 
 
 22. 0, 21.2 ) 
 22.O, 21.7, 21. 1 . . .) 
 22.5, 2O-7, 19.6 
 I7.I, 19.8 
 
 13.6, 10.3, 10.8 
 
 7-170 . . ) 
 
 V2l, 1/36, mm 
 oiv, ii2m, i/3/ 
 1/46, mil/, 1/2,1 
 i>3/, vm, v^b 
 041;, mp, V2m 
 i/o- im, ii2b 
 
 TO3i/, /i 211, 1/1-26 
 
 TO2-3D, 12-1,11, lib 
 
 62-31;, T3-4C 
 C3i/, do-m, i/3/ 
 
 f211, 11, HIS, 1/32 
 
 5-8, 5-9, 7-0, 3-0.-) 
 
 /6i/ g4i> 1/12, limit z 
 
 3-9, 3-5 
 3.9, 3.0, 4.1 
 18 20 10 
 
 11 not seen, limit z 
 
 
 11 not seen, limit 2 and a. . 
 v not seen limit z 
 
 
 
 
 
 v glimpsed, ma. 
 
 
 
 
 
 
 
 
 39 
 4-4 
 5-5 
 6.7 
 12.4 
 19.2 
 
 22. 
 27.6 
 26.6 
 26.5 
 
 26.4 
 19.2 
 
 16.2 
 
 15.4 
 12.5 
 
 8.8 
 
 8.5 
 6.8 
 
 4-9 
 3-4 
 4-4 
 < 4 
 
 < 2 
 < 2 
 
 < 6 
 
 < 2 
 
 < 4 
 
 13.16 
 
 '3-19 
 
 13.08 
 12.90 
 12.70 
 ii .67 
 10.47 
 
 IO.OO 
 
 9.09 
 9.26 
 
 9.27 
 9.29 
 
 10.47 
 10.97 
 
 II. 12 
 11.63 
 12.31 
 
 12-35 
 12.68 
 13-02 
 13.28 
 13.10 
 <I3-2 
 
 03 5 
 <i3-5 
 
 <I2.8 
 
 <'3-5 
 
 <I3-2 
 
 good 
 
 good 
 good 
 good 
 good 
 good 
 fair 
 fair 
 good 
 good 
 fair 
 
 fair 
 
 good 
 fair 
 fair 
 low 
 good 
 poor 
 moon 
 fair 
 fair 
 moon 
 good 
 good 
 good 
 good 
 fine 
 good 
 
 325 
 333 
 346 
 357 
 378 
 385 
 391 
 396 
 3 
 16 
 
 30 
 
 50 
 58 
 67 
 75 
 95 
 
 IOI 
 
 107 
 
 127 
 147 
 165 
 
 -0.25 
 
 O. IO 
 O.O2 
 
 + 0.15 
 + 0.40 
 + 0.67 
 + 0.07 
 
 o. 19 
 -0.88 
 -0.47 
 0.46 
 
 0.61 
 
 + 0.18 
 + 0.51 
 + 0.41 
 + 0.63 
 + 0.64 
 + 0.53 
 + 0.71 
 + 0.59 
 + 0.46 
 o.oo 
 
 
 j e A A 
 
 1/42, em 
 ii^a, vo-ie, g2ii 
 
 bm, me, mo- i2d 
 
 i/3-4i, T/3-4/, mo 
 01-211, 112,1, i>3m 
 
 4-0, 4-9 
 6.1, 6.4, 4.0 
 8.9, 4.3, 7.0 
 12.8, ii. 8, 11.3, 14.0 
 18.6, 17.3, 21.8 
 21. i, 23.0 
 28.5, 26.7, 27.2 
 25.7, 26.2, 28.0. . . . 
 25.8, 26.2, 28.0, 26.2 
 (27.0, 25.2, 27.2. . ) 
 j 25 9 26 8 . ) 
 
 112m, 1/2/, 110, 112p, 051; .... 
 
 /5i/, m6v, mb 
 I6v, 63i/, i/i 2C 
 631;, co ID, i/4(f 
 C3 41), i/i 2d 
 dm, vj, 114$ 
 d2 311, i/i/ 
 
 18.2, 19.0, 20.6. . . . 
 17.2, 16.6, 14.8. . . . 
 16.6, 15.8, 14.8 
 12.8, 12.3 
 9.8, 7.8, 9.9 
 8.3,8.8 
 
 
 
 
 
 v glimp c ed, ei 211 
 
 
 
 
 
 
 11 not seen limit a 
 
 
 
 
 v not seen limit a .... 
 
 
 v not seen, limit 2 <ie . . . . 
 
 
 
 
CHAPTER XIII. Y CASSIOPEIA. 
 
 TABLE 114. 8629 Y CASSIOPEIA. VISUAL OBSERVATIONS of THE VARIABLE. Continued. 
 
 No. 
 
 Date. 
 
 u 
 
 
 
 i 
 
 1 
 
 I 
 
 < 
 
 Comparison. 
 
 Reduction, Steps. 
 
 Means. 
 
 Seeing. 
 
 t. 
 
 A Mag. 
 
 Month 
 and Day. 
 
 Hour 
 C. S. T. 
 
 Julian 
 Day 
 G. M.' T. 
 
 Steps. 
 
 Mag. 
 
 54 
 
 55 
 56 
 57 
 58 
 59 
 60 
 61 
 62 
 
 63 
 64 
 
 65 
 66 
 
 67 
 68 
 69 
 70 
 
 7i 
 
 72 
 73 
 
 74 
 75 
 76 
 
 77 
 
 78 
 79 
 
 80 
 81 
 82 
 
 83 
 84 
 85 
 
 86 
 87 
 88 
 
 89 
 
 90 
 9i 
 92 
 93 
 94 
 95 
 96 
 97 
 98 
 
 99 
 
 IOO 
 IOI 
 IO2 
 103 
 104 
 105 
 
 1900 
 Jan. 8 
 
 24 
 Feb. 9 
 10 
 19 
 25 
 Mar. 1 9 
 
 21 
 
 Apr. 4 
 May i 
 
 20 
 June 15 
 July 12 
 Aug. 14 
 28 
 Oct. 1 6 
 25 
 Nov. 26 
 1901 
 Feb. 10 
 Dec. 21 
 1902 
 Aug. 15 
 Oct. i 
 30 
 Dec. 26 
 1903 
 Oct. 10 
 Dec. 6 
 1904 
 Aug. 4 
 29 
 Sept. 2 
 Oct. 6 
 Nov. 3 
 29 
 1905 
 Jan. 7 
 28 
 
 Feb. 9 
 Mar. 3 
 
 24 
 May 22 
 June 4 
 26 
 27 
 July 30 
 Aug. 6 
 
 22 
 28 
 
 Sept. 2 
 17 
 19 
 
 Oct. 20 
 22 
 
 3' 
 Nov. 21 
 
 { 
 
 7 
 ii 
 
 7 
 8 
 8 
 8 
 8 
 8 
 
 '5 
 
 H 
 10 
 
 15 
 9 
 9 
 10 
 
 7 
 
 7 
 
 7 
 8 
 
 9 
 7 
 10 
 
 8 
 6 
 
 9 
 8 
 
 9 
 9 
 
 7 
 
 9 
 
 8 
 
 8 
 
 7 
 8 
 '4 
 15 
 12 
 
 15 
 12 
 
 9 
 I I 
 
 9 
 ii 
 8 
 1 1 
 
 8 
 
 7 
 
 12 
 
 6 
 
 2410000+ 
 5028.67 
 5028.68 
 5028 . 68 
 
 5044-54 
 5060.71 
 5061.54 
 5070.56 
 5076.56 
 5098 . 56 
 5100.58 
 5II4-58 
 
 5141-88 | 
 
 5160.83 
 5186.65 
 5213-85 
 5246.60 
 5260.60 
 5309 67 
 53I8-54 
 5350.54 
 
 5426.54 
 5740.58 
 
 5977- 
 6024.62 
 6053.54 
 6110.67 
 
 6398.58 
 6455 50 
 
 6697-63 
 6722.58 
 6726.63 
 6760.63 
 6788 
 6814.54 
 
 6853-63 
 6874.58 
 
 6886.56 | 
 
 6908.54 j 
 
 6929.58 
 6988 . 83 
 7001.88 
 7023.73 
 7024.88 
 
 7057 75 
 7064.63 
 7080 . 7 i 
 7086.63 
 7091.71 
 7106.58 
 7108.71 
 7139-56 
 7I4I-54 
 7150.75 
 7I7I-50 
 
 350 
 
 350 
 350 
 150 
 275 
 350 
 150 
 175 
 150 
 275 
 275 
 130 
 275 
 150 
 'SO 
 237 
 150 
 200 
 460 
 
 67 
 40 
 
 150 
 350 
 
 237 
 67 
 237 
 
 67 
 40 
 
 150 
 150 
 67 
 40 
 
 40 
 
 237 
 237 
 67 
 275 
 67 
 275 
 150 
 250 
 450 
 300 
 237 
 237 
 237 
 237 
 150 
 237 
 150 
 237 
 80 
 
 237 
 237 
 ISO 
 
 40 
 40 
 40 
 
 6 
 
 12 
 40 
 
 6 
 
 12 
 
 6 
 
 12 
 12 
 12 
 12 
 6 
 6 
 40 
 
 6 
 6 
 
 40 
 
 12 
 
 6 
 6 
 
 40 
 
 24 
 40 
 
 12 
 
 40 
 
 12 
 
 6 
 
 6 
 6 
 
 12 
 
 6 
 
 24 
 
 6 
 
 40 
 40 
 
 12 
 12 
 12 
 12 
 
 6 
 40 
 40 
 
 12 
 
 40 
 4 
 40 
 4 
 
 6 
 40 
 6 
 40 
 
 12 
 
 4 
 40 
 
 6 
 
 v not seen, limit 2</. . .) 
 eis double, 1 3 and I3J M ,5" r 
 
 <* \Z. 2211 . . . } 
 
 
 2.O 
 
 14.18 
 
 O3.6 
 <I3 6 
 I3-70 
 
 <I2.8 
 
 13-70 
 13-55 
 I3-40 
 12.98 
 
 11.23 
 
 10.71 
 11.03 
 10.41 
 
 12.22 
 12.22 
 12.68 
 13.72 
 <I2.8 
 
 <I2.4 
 
 12.47 
 
 12. 
 
 10-95 
 11.26 
 12. 06 
 
 8-73 
 
 11.22 
 
 12.47 
 
 12-55 
 11.46 
 
 10.86 
 
 fair 
 
 282 
 
 + 0.45 
 
 
 11 not seen, a glimpsed. . . . 
 
 TI not seen, limit a 
 
 
 
 moon 
 
 3i5 
 
 + 0.25 
 
 SSv, "2-31;, 112-32 
 v not seen, limit e 
 
 i.o, -0.4, 2.5 
 
 i .0 
 <6 
 i .0 
 19 
 
 2.7 
 5-o 
 
 14.8 
 17.9 
 
 15 
 
 zm, via, limit fl 
 
 I O 1 I 
 
 good 
 
 good 
 good 
 
 fair 
 
 moon 
 fair 
 
 fair 
 good 
 good 
 good 
 
 330 
 
 350 
 354 
 368 
 
 396 
 
 4 
 30 
 57 
 90 
 104 
 
 153 
 162 
 
 + 0.50 
 
 + I.1O 
 
 + 1.03 
 + 1.23 
 
 4-1.22 
 
 + 0-99 
 + I.I3 
 0.04 
 
 + 0.53 
 + 0.25 
 0.28 
 + 0.65 
 
 Ti glimpsed, e\o 
 
 
 V2a, V2Z, g3i/, e4V 
 C3-4V, -vig, T>4-5a 
 
 CI2V, Tl^d 
 
 vS ioe, /2 36 
 
 4.1, 2.0, 3.0, 1-9 
 
 2.4, 7.0, 6.6 
 4-8, 14.8 I 
 
 14.. Q . i 
 
 62-3?, V2-3C 
 
 ayv, TIC, "vyi 
 photometer 
 
 17.1, 18.1 
 15.0, 16.3, 13.8 
 
 ^2-36, 64-50, d2V, V2f 
 d2V, T12 j 
 
 8.8, 9.8 
 8.8, 9.8 
 
 9-3 
 9-3 
 6.8 
 
 i-5 
 <6 
 
 <8 
 7.8 
 
 J2V, V2 
 
 S 8 7 q 
 
 g4T, VIZ 
 
 2.O, I.O 
 
 v not held, limit g 
 
 
 v not seen, limit / 
 
 
 
 
 
 vj 
 
 
 good 
 
 '74 
 
 -0.74 
 
 photograph 
 
 
 641', v ic 
 photometer 
 
 15-6, 17.3 
 
 16.4 
 
 fair 
 good 
 fair 
 
 good 
 good 
 
 fair 
 good 
 good 
 fine 
 
 48 
 77 
 134 
 
 12 
 69 
 
 3" 
 336 
 340 
 
 374 
 
 4-0.74 
 + 0.25 
 -0.54 
 
 -0.97 
 + 0.49 
 
 -0.83 
 0.52 
 
 -i-45 
 -0.34 
 
 photometer 
 
 
 
 140, 17-86 
 641), C2v, vqd 
 
 dyv, vie 
 
 31.2, 27.1 
 15.6, 14.3, 14.8 
 
 7870 
 
 29.8 
 14.9 
 
 7-8 
 7-4 
 
 fiv, V2e 
 
 6879 
 
 photometer 
 
 
 photometer 
 
 
 
 photographs 
 
 
 
 vl, vm 
 photometer 
 
 23.2, 25.0 
 
 24.1 
 
 9.66 
 
 IO.O2 
 IO.2I 
 
 II. 12 
 
 "73 
 
 12. 2O 
 13-0 
 13-5 
 I4.I 
 I3-89 
 I3-36 
 I3-52 
 13.28 
 
 >3-7 
 J3-07 
 
 <I2.8 
 
 12.31 
 
 12.72 
 13.01 
 12.03 
 ii. Si 
 
 good 
 
 fair 
 good 
 
 fair 
 
 fair 
 
 low 
 fair 
 poor 
 fair 
 good 
 good 
 good 
 good 
 fair 
 good 
 dull 
 good 
 good 
 poor 
 good 
 good 
 
 18 
 
 45 
 78 
 
 90 
 
 112 
 
 133 
 192 
 
 205 
 
 227 
 228 
 261 
 268 
 284 
 290 
 
 295 
 312 
 
 343 
 345 
 354 
 375 
 
 0.06 
 
 -0.48 
 0.82 
 
 -0.38 
 
 -0.39 
 
 -0.39 
 -o. 4 
 o.o 
 4-0. 4 
 + 0.23 
 0.40 
 0.24 
 
 -0.44 
 o.o 
 0.60 
 
 -i. 17 
 -0.15 
 
 + O.22 
 
 -0.37 
 + 0.71 
 
 photometer 
 
 
 
 66i', vie, vsd 
 651*, civ, v$d 
 C4v, vid 
 c^v, V2d 
 div, v/ 
 
 13.6, 17.3, 15.8... {. 
 
 '4-6, 15-3. 15-8...) 
 12.3, ii. 8 ) 
 11.3, 12.8 ) 
 9.8, 7.8 
 
 iS-4 
 
 12.0 
 
 8.8 
 5 
 
 2 
 I 
 O. I 
 30 
 2.O 
 
 3-4 
 i 
 4-5 
 <6 
 8.8 
 6-4 
 49 
 10.3 
 ii. 6 
 
 jSv v&a 
 
 O 2 IO I 
 
 vn i 
 
 
 ayu 
 
 
 n 2v 
 
 
 fSicrv, via 
 /8 ion, TJO. 
 
 (-1.2), 3.1 
 
 (-1.2), 21 
 
 /6 7^, irja 
 
 1-3, 4. 1 
 
 z, a and v glimpsed 
 
 
 J5~f>v, 1/450 
 
 2.3, 6.6 
 
 v not seen, limit e 
 
 
 vi /. /8<z . 
 
 8 8 to 
 
 JS, vie 
 f 4511, i6 i 
 
 3-8,6.9 
 3.3, 8.1 
 
 vrf, div 
 
 10.8, 9.8 
 
 c$v, vid, i3-4/ 
 
 11.3, ii. 8, 11.3 
 
184 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 
 
 o 
 <a 
 
 S> 
 
 =8 
 
 m 
 ot 
 
 10 
 
 - o 
 o 
 
 03 
 
 ki 
 
 <o 
 
 CO 
 
 FIG. 38. LIGHT-CURVB OF Y CASSIOPEIA. 
 
CHAPTER XIII. Y CASSIOPEIA. 
 
 185 
 
 TABLB 115. 8629 Y CASSIOPEIA. MEAN MAGNITUDES PROM 34 j DAY GROUPS. 
 
 Group No . . . 
 I D 
 
 i 
 
 2 
 
 68 
 
 3 
 
 4 
 
 1 17 
 
 5 
 
 171 
 
 6 
 20 s 
 
 7 
 
 21Q 
 
 8 
 
 271 
 
 9 
 
 708 
 
 IO 
 342 
 
 ii 
 376 
 
 12 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 f t 
 
 
 4.8 
 
 60 
 
 126 
 
 I ^4 
 
 1 88 
 
 
 
 2O6 
 
 12 S 
 
 1C2 
 
 ^8O 
 
 36 \ 
 
 I No. 
 
 r t 
 
 9.69 
 0.06 
 
 7 
 
 16 
 
 9 85 
 0.40 
 
 4 
 
 eg 
 
 10.61 
 o. 16 
 I 
 
 II.80 
 O.62 
 I 
 
 117 
 
 12.87 
 0.04 
 
 2 
 156 
 
 13-30 
 0.05 
 3 
 
 
 
 13 4" 
 0.24 
 
 2 
 282 
 
 13.14 
 0. 12 
 
 3 
 
 ^22 
 
 12.80 
 + 0.28 
 
 2 
 
 1S8 
 
 10.31 
 O.O9 
 
 4 
 
 -JQ6 
 
 M 
 
 
 TO 8^ 
 
 
 12 85 
 
 
 
 
 
 id 18 
 
 1 1 7O 
 
 T -1 ^T 
 
 
 4746 < jig 
 
 *7 
 
 
 + o 60 
 
 
 + o 23 
 
 
 
 
 4-n 4S 
 
 + o 38 
 
 + 1 12 
 
 
 (. No 
 
 
 
 
 2 
 
 2 
 
 
 
 
 I 
 
 2 
 
 7 
 
 
 (I 
 
 
 
 
 
 I eg 
 
 
 
 
 
 
 
 
 M 
 
 10 87 
 
 
 
 
 T -1 2O 
 
 
 
 
 
 
 
 
 JM 
 
 _f_ j 06 
 
 
 
 
 + o 18 
 
 
 
 
 
 
 
 
 No 
 
 
 
 
 
 2 
 
 
 
 
 
 
 
 
 (< 
 
 
 
 
 
 '74 
 
 
 
 
 
 
 
 
 M 
 
 
 
 
 
 12 47 
 
 
 
 
 
 
 
 
 M 
 
 
 
 
 
 O 74 
 
 
 
 
 
 
 
 
 Mo 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r / 
 
 
 48 
 
 
 I ^4 
 
 
 
 
 
 
 
 
 
 M 
 
 
 
 
 12 06 
 
 
 
 
 
 
 
 
 
 5976 JM 
 
 
 
 
 O *\4 
 
 
 
 
 
 
 
 
 
 i. No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 r < 
 
 
 
 60 
 
 
 
 
 
 
 
 12Q 
 
 ^74 
 
 
 M 
 
 8 71 
 
 
 
 
 
 
 
 
 
 12. l6 
 
 10.86 
 
 
 6 3 86 1 JM 
 
 
 
 
 
 
 
 
 
 
 I O"? 
 
 O 77 
 
 
 L No 
 
 
 
 
 
 
 
 
 
 
 -I 
 
 I 
 
 
 ft 
 
 18 
 
 
 AJ 
 
 
 
 
 
 
 
 
 
 
 M 
 
 o 66 
 
 
 10 66 
 
 I I 71 
 
 
 
 
 
 
 
 
 
 JM 
 
 
 
 
 O 1Q 
 
 
 
 
 
 
 
 
 
 No 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1 * 
 Means] ^ 
 I No. 
 
 16 
 9.70 
 0.06 
 
 14 
 
 53 
 10-33 
 
 O.02 
 IO 
 
 85 
 ii .46 
 
 + O. 12 
 II 
 
 121 
 12.26 
 0.05 
 
 5 
 
 m 159 
 
 fi3 .00 
 
 O. II 
 
 7 
 
 1 88 
 13-30 
 -0.05 
 3 
 
 ;::;| 
 :::i 
 
 
 291 
 I3.67 
 O.OI 
 
 3 
 
 325 
 12.91 
 
 -0.34 
 
 8 
 
 354 
 12.90 
 + 0.52 
 6 
 
 383 
 10.50 
 +0.17 
 
 5 
 
 TABLE 116. 8629 Y CASSIOPEIA. OBSERVED MAXIMA AND MINIMA. 
 Elements of maximum. 1898 March S (J. D. 2414354)+4IO d E. M-m=lS8' 1 . 
 
 MAXIMA. 
 
 MINIMA. 
 
 H 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 g 
 o 
 o. 
 H 
 
 Date. 
 
 Mag. 
 
 Corr. 
 
 Wt. 
 
 Calendar. 
 
 J. D. 
 
 H. 
 
 P. 
 
 Calendar. 
 
 J. D- 
 
 H. 
 
 P. 
 
 
 
 i 
 
 2 
 
 3 
 
 4 
 5 
 6 
 
 1898 Mar. ii 
 1899 Apr. 8 
 1 900 June 9 
 1901 July 24 
 1902 Sept. 7 
 1903 Oct. 10 
 1904 Nov. 27 
 
 4360 
 
 4753 
 5180 
 
 5590 
 6000 
 6398 
 6812 
 
 9.41 
 9. 10 
 10.57 
 
 9.14 
 8.83 
 10.30 
 me 
 me 
 8-43 
 9-36 
 
 + 6 
 ii 
 + 6 
 + 6 
 + 6 
 - 6 
 
 2 
 
 7 
 1 1 
 
 7 
 i 
 
 2 
 2 
 
 9 
 
 i 
 
 2 
 
 3 
 4 
 5 
 6 
 
 1 898 Nov. 4 
 1899 Dec. 13 
 1901 Feb. 16 
 1902 Mar. 31 
 1903 May 15 
 1 904 June 8 
 
 4598 
 5012 
 
 5432 
 5840 
 6250 
 6640 
 
 14.0 
 14.2 
 
 13-7 
 13 9 
 me 
 me 
 me 
 me 
 
 - 8 
 4 
 + 6 
 
 + 2 
 
 + 4 
 -16 
 
 17 
 19 
 4 
 i 
 
 2 
 
 3 
 
 
 8.70 
 9-63 
 
1 86 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 DAYS 
 100 SOP 3OO 400 SOO 
 
 10 
 
 Ul// 
 
 5 
 
 3 
 H 
 
 I 
 
 8629 Y CASSIOPEIAE 
 
 Min, = i 
 \ M-m = /58<t 
 
 /3 
 
 FIG. 39. MEAN LIGHT-CURVE OF Y CASSIOPEIA. 
 
CHAPTER XIV. 
 
 GENERAL CONCLUSIONS. 
 I. PRECISION OF THE PHOTOMETER MEASURES. 
 
 The tables headed " Standard Magnitude Stars" and " Mean Magnitudes of 
 Comparison Stars ' ' furnish data for some important conclusions in regard to the 
 precision of the photometric work. The method of reduction of the measures 
 with the 6-inch, as explained on page 16, gives magnitude values for each of the 
 standard stars which must average the same as the catalogue values. If both 
 were perfect, the separate residuals between the catalogue and measured magni- 
 tudes would be zero. Except for systematic differences, the actual residuals 
 represent the combined effect of the accidental errors of the two systems com- 
 pared. Table 117 collects the mean values of these residuals for the three standard 
 stars in each field for each night, expressed in hundredths of a magnitude and 
 taken without regard to sign. The mean residual for each of the three or four 
 nights is given separately from the Harvard and from the Potsdam catalogue 
 values. Then follow two columns giving the means of all the nights under the 
 headings H and P for the two systems. The next two columns give the number 
 of nights' observations and the mean residuals of my measures among them- 
 selves. Then follow the Potsdam colors, W standing for white, G for yellow, 
 GW for yellowish white, WG for whitish yellow, the plus and minus signs indicat- 
 ing a greater or less degree of color. 
 
 Before these results are discussed, it is necessary to find if there is a systematic 
 difference, due to color, between my measures and the two catalogues. The 
 standard stars and their residuals were arranged according to color, and means 
 taken of five groups each containing at least four stars, 28 stars in all. It was 
 found that I see white stars fainter and yellow stars brighter than the catalogues, 
 the range between white and whitish yellow stars being 0.20 as compared with 
 the Harvard and 0.07 as compared with the Potsdam values. Correcting the 
 28 stars for the color effect, the mean residual was reduced from 0.12 to o.n for 
 the Harvard system, but remained at 0.06 for the Potsdam system, an effect so 
 slight that it may be disregarded in the discussion. 
 
 The results of Table 117 can now be discussed. 
 
 ( i ) Considering the agreement of my measures among themselves. The average 
 difference between a single night's magnitude of a star and the mean of the three 
 (or in one case four) nights, ranges from 0.02 to 0.07 when the means for the 
 three stars in the field are considered. The residuals for the separate stars 
 range from o.oi to o. 1 1 ; the general average of the residuals is 0.04, correspond- 
 ing to a probable error in the mean of a little less than 0.03 magnitude. The 
 extreme values of the probable error are 0.0 1 and 0.05 for the separate stars. 
 
 187 
 
i88 
 
 RESEARCHES IN STELLAR PHOTOMETRY 
 
 For comparison, in the three parts of the Potsdam catalogue the probable errors 
 of the mean of two nights are 0.057, 0.040, and 0.037. 
 
 (2) The agreement of my measures with the Potsdam catalogue. The mean 
 residuals for the different fields range from 0.03 to o.n, averaging 0.07 (the maxi- 
 mum residual for a single star is 0.24). This is just about the residual which would 
 be expected if the two sets of measures were of equal precision, as the residual 
 0.07 is the combined accidental error of the two sets of measures. 
 
 (3) The agreement of my measures with the Harvard -values. The residuals 
 range from 0.05 to 0.28, with an average value of 0.15. If a color correction 
 were applied this would be reduced to 0.14, but would still be double the residual 
 from the Potsdam catalogue. It is realized that great caution should be used 
 in drawing general conclusions from the measures of so few stars; nevertheless, 
 the fact that the residuals from the Potsdam system are persistently (except 
 for S Lyrae) smaller than from the Harvard system seems to admit of but one 
 explanation, the greater accuracy of the Potsdam measures, and the close 
 approach to the Potsdam accuracy in the measures of the present series. The 
 basing of the Harvard measures on polar stars would naturally introduce greater 
 local errors than would be the case in the Potsdam measures, which are based 
 on standards near the measured fields. This doubtless accounts for part of the 
 difference. 
 
 TABLE 117. STANDARD MAGNITUDE STARS. AGREEMENT OP MAGNITUDE RESULTS. 
 
 Field. 
 
 Residuals between ray meas- 
 ures and the catalogue 
 magnitudes. 
 
 My measures 
 inter se. 
 
 Potsdam Colors. 
 
 Harvard. 
 
 Potsdam. 
 
 Mean. 
 
 No. 
 nights 
 
 Mean 
 A. 
 
 I 
 
 a 
 
 3 
 
 4 
 
 I 
 
 a 
 
 3 
 
 4 
 
 H. 
 
 p. 
 
 103 T Andromedae. . . 
 267 V Andromedae. . . 
 787 W Andromedae. . . 
 4315 R Comas 
 
 16 
 
 9 
 6 
 
 14 
 3 
 
 14 
 4 
 
 29 
 
 12 
 
 7 
 3* 
 8 
 
 9 
 
 '3 
 a 
 a 
 7 
 
 16 
 
 8 
 18 
 
 16 
 aa 
 
 36 
 
 '5 
 
 19 
 8 
 
 17 
 1 1 
 II 
 14 
 3 
 
 21 
 19 
 
 21 
 32 
 
 16 
 
 20 
 
 7 
 
 2 
 
 8 
 
 10 
 
 3 
 
 i 
 
 5 
 
 18 
 
 9 
 7 
 
 12 
 
 6 
 
 10 
 
 4 
 
 10 
 12 
 
 3 
 5 
 9 
 6 
 
 IS 
 
 '3 
 6 
 6 
 
 10 
 
 2 
 
 7 
 a 
 8 
 3 
 8 
 
 10 
 
 3 
 
 ii 
 ii 
 6 
 
 I 
 
 18 
 
 10 
 
 8 
 9 
 
 10 
 
 15 
 
 5 
 
 23 
 13 
 23 
 a8 
 
 13 
 
 9 
 
 3 
 8 
 8 
 5 
 
 3 
 7 
 
 1 1 
 
 9 
 
 10 
 10 
 
 6 
 7 
 
 3 
 3 
 3 
 3 
 3 
 3 
 3 
 3 
 3 
 3 
 4 
 3 
 
 3 
 
 2 
 
 6 
 6 
 
 4 
 3 
 3 
 7 
 5 
 3 
 4 
 5 
 
 GW- W- WG- 
 W- W- W 
 GW- GW- GW 
 WG GW G- 
 GW- GW- GW- 
 W WG WG- 
 GW GW W 
 W- GW- W 
 W GW W 
 GW WG WG 
 WG G- 
 G- WG G 
 
 5798 RU Herculis . . . . 
 
 6100 RV Herculis 
 
 6894 S Lyras 
 
 7220 S Cygni 
 
 7269 SX Cygni 
 7458 V Delphini. 
 
 8518 Z Cassiopeiae . . . 
 8629 Y Cassiopeia? .... 
 
 Means 
 
 
 
 *3 
 
 
 4 
 
 
 
 
 
 
 
 
 
 
 PRECISION OF MEASURES WITH THE DIFFERENT APERTURES. 
 
 The average residual, expressed in hundredths, of the magnitudes of the 
 measured stars (not including the standards) from the mean of all the nights, 
 is given in the following table for the different apertures separately: 
 
CHAPTER XIV. GENERAL CONCLUSIONS. 
 
 189 
 
 TABLE 118. MAGNITUDE RESIDUALS FOR MEASURED STARS. 
 
 Aperture. 
 
 6 
 
 12 
 
 40 
 
 Mean. 
 
 103 T Andromedae. . . 
 
 9 
 
 9 
 
 ii 
 
 10 
 
 267 V Andromedae. . . 
 
 8 
 
 10 
 
 7 
 
 8 
 
 787 W Andromedae. . . 
 
 7 
 
 4 
 
 6 
 
 6 
 
 43 15 R Comse 
 
 8 
 
 6 
 
 
 8 
 
 5798 RU Herculis . . 
 
 8 
 
 
 
 
 6100 RV Herculis 
 
 5 
 
 6 
 
 15 
 
 9 
 
 6894 S Lyrae 
 
 
 6 
 
 
 
 7220 S Cygni 
 
 
 8 
 
 18 
 
 
 7269 SX Cygni 
 
 7 
 
 
 
 g 
 
 7458 V Delphini 
 
 7 
 
 6 
 
 
 
 8518 Z Cassiopeia: . . . 
 
 8 
 
 7 
 
 5 
 
 7 
 
 8629 Y Cassiopeia: . . . 
 
 6 
 
 5 
 
 14 
 
 8 
 
 
 7 
 
 
 
 8 
 
 
 
 
 
 
 II. LIMIT OF VISION OF THE 6-, 12-, AND 4O-INCH TELESCOPES. 
 
 An interesting result of the present investigation is the photometric magni- 
 tude of the limit of vision of the three telescopes used. The estimates of the limit 
 are given for each field in the table "Visual Comparisons of the Variable" in 
 steps below the faintest comparison star visible. Table 119 collects the most reli- 
 able of these estimates, made in good seeing and classified for each aperture accord- 
 ing to the ocular used, as it is well known that a higher magnifying power will 
 show fainter stars. Following the columns giving the field, date of observation, 
 and estimate of limit, are two magnitude columns on the H. C. O. system, giving 
 the photometric magnitude of the star used in the estimate and the resulting 
 apparent magnitude of the limit, using as the value of one step 0.14. The next 
 two columns give the zenith distance and the reduction to the zenith resulting 
 from atmospheric absorption. The final two columns give the zenith magnitude 
 of the limit, both in the Harvard and Potsdam systems. Using Pogson's formula 
 
 Limit of vision 9.0 + 5 log aperture in inches 
 we have the following comparison between calculated and observed limits:* 
 
 6-inch, calculated 12 
 
 6-inch, observed, ocular 1 50 12 
 
 6-inch, observed, ocular 150 13 
 
 1 2-inch, calculated 14 
 
 i2-inch, observed, ocular 275 14 
 
 12-inch, observed, ocular 275 14 
 
 4O-inch, calculated 17 
 
 4O-inch, observed, ocular 750 16 
 
 4o-inch, observed, ocular 750 17 
 
 89. 
 
 90 Harvard scale. 
 
 02 Potsdam scale. 
 
 40. 
 
 27 Harvard scale. 
 
 57 Potsdam scale. 
 
 01. 
 
 8 Harvard scale. 
 
 i Potsdam scale. 
 
 * Compare provisional results from six fields in Table 4, page 10. 
 
RESEARCHES IN STELLAR PHOTOMETRY. 
 
 The great thickness of the 4O-inch objective, about 4^ inches, requires a 
 correction for absorption. Mr. Lundin informed me that the Clarks estimated 
 that 85 per cent of the light was transmitted by the lens. The corresponding 
 correction is o. 18 magnitude, reducing the calculated limit to 16.83, i n good 
 agreement with the observed values. 
 
 The 275 ocular used on the 1 2-inch was made by Steinheil and is of good, 
 but not unusual transparency, showing a limit in good agreement with the 
 calculated value. 
 
 The 6-inch requires special mention, since it is a silvered-glass Newtonian 
 reflector. This form is usually credited with a reflecting power very much lower 
 than these measures indicate. For example, we read in Young's General Astron- 
 omy, paragraph 49: " In a Newtonian reflector in average condition, the percent- 
 age (reflected to incident light) seldom exceeds 50 per cent, and more frequently 
 is lower than higher." If this were correct the limit should be 12.3 magnitude, 
 while in fact the reflector does nearly all that could be expected of a refractor of 
 equal aperture, in spite of the fact that the mirror was silvered only three times 
 in fourteen years, in 1892, 1897, and 1903. 
 
 It should be noted as a matter of greatest importance that these limits of 
 vision furnish a check on the adopted absorption curve of the photometer wedge 
 used in the work. A change of 5 per cent in the curve would make a difference 
 of half a magnitude in the range between the standard 7th magnitude stars and 
 the limit of the 4o-inch. It seems justifiable to conclude, therefore, that the 
 absorption curve is not in error by as much as 5 per cent. 
 
 TABLE 119- LIMIT OP VISION. 
 
 6-INCH, OCULAR 40. 
 
 Field. 
 
 Date. 
 
 Estimate 
 
 Magnitude H. 
 
 Reduction. 
 
 Corrected Magnitude. 
 
 Star. 
 
 Limit. 
 
 Z. 
 
 Cor. 
 
 H. 
 
 P. 
 
 T Andromedae . . . 
 R Comae 
 
 y m d 
 94 ii 20 
 
 94 5 3 1 
 04 5 10 
 04 ii 30 
 04 10 6 
 
 2<X 
 
 b 
 
 z 
 n 
 ft 
 
 13. 12 
 12.29 
 12.83 
 11.84 
 11.80 
 
 13.40 
 12.29 
 12.83 
 11.84 
 11.80 
 
 21 
 
 43 
 
 34 
 37 
 
 22 
 
 .01 
 .08 
 .04 
 05 
 .01 
 
 I3-4I 
 13-37 
 12.87 
 11.89 
 ii .81 
 
 13-49 
 13-67 
 13-17 
 12.24 
 
 12.22 
 
 R Comae .... 
 
 SX Cygni 
 
 W Andromedae.. . . 
 Mean 
 
 12.71 
 
 12.96 
 
 
 
 
 
 
 
 
 OCULAR 80. 
 
 T Andromedae . . . 
 V Andromedae .... 
 RU Herculis 
 RV Herculis 
 RV Herculis 
 
 96 10 24 
 98 10 ii 
 
 97 7 23 
 98 8 24 
 98 8 22 
 
 2-3 <k 
 
 4<d 
 
 P 
 I 
 
 11.85 
 11.83 
 13-42 
 13.0 
 13-0 
 
 12.20 
 12.35 
 I3-42 
 13-0 
 13-0 
 
 40 
 46 
 
 34 
 26 
 58 
 
 .06 
 .09 
 .04 
 .02 
 
 .20 
 
 12.26 
 12.44 
 13.46 
 13.0 
 13.2 
 
 12.34 
 12.73 
 
 13-73 
 I3-25 
 13-45 
 
 
 12.67 
 
 13.10 
 
 
 
 
 
 
 
 
CHAPTER XIV. GENERAL CONCLUSIONS. 
 
 191 
 
 TABLE 119. LIMIT OP VISION. Continued. 
 
 6-INCH, OCULAR 150. 
 
 Field. 
 
 Date. 
 
 Estimate 
 
 Magnitude H. 
 
 Reduction. 
 
 Corrected Magnitude. 
 
 Star. 
 
 Limit. 
 
 Z. 
 
 Cor. 
 
 H. 
 
 P. 
 
 T Andromedae .. . . 
 T Andromedae .... 
 T Andromedae .... 
 T Andromedae .... 
 T Andromedae .... 
 V Andromedae . . . 
 V Andromedae . . . 
 V Andromedae . . . 
 V Andromedae . . . 
 W Andromedae.. . . 
 W Andromedae... . 
 W Andromedae... . 
 R Comae 
 
 y m d 
 96 i 13 
 97 9 20 
 oo i 24 
 97 8 19 
 oo 9 15 
 97 9 20 
 97 ii 16 
 98 i 16 
 98 i 18 
 99 6 10 
 99 7 29 
 03 10 ii 
 94 5 ii 
 05 3 24 
 05 3 24 
 97 8 20 
 
 97 9 14 
 97 10 14 
 97 10 23 
 98 8 27 
 98 8 27 
 97 9 21 
 97 9 25 
 97 10 14 
 98 4 26 
 96 12 23 
 97 9 22 
 97 ii 16 
 97 12 29 
 94 6 6 
 94 6 20 
 94 7 2 
 oo 10 26 
 94 6 28 
 94 8 26 
 97 8 27 
 99 7 8 
 99 6 10 
 
 OO I I 
 
 98 9 7 
 98 10 5 
 98 ii 5 
 
 3<k 
 
 X 
 
 4<k 
 5<k 
 4<n 
 5<d 
 g 
 
 K? 
 Kh 
 
 2<h 
 u 
 Kb 
 u 
 z 
 P 
 P 
 KP 
 2-3 <n 
 3-4 < 
 2<n 
 
 3-4 <* 
 4<* 
 3<* 
 3<* 
 
 X 
 
 2-3 <z 
 
 z 
 z 
 
 X 
 2<X 
 
 2<X 
 
 y 
 
 i<a 
 
 2<0 
 
 3-4 < a 
 4-5 <a 
 k 
 Kk 
 z 
 z 
 a 
 
 11.85 
 13.12 
 13.12 
 11-85 
 11.85 
 12.24 
 11-83 
 12-34 
 12-34 
 11.80 
 11.80 
 12.42 
 12.29 
 
 12. 8l 
 
 12.83 
 I3-42 
 I3-42 
 I3-42 
 12-75 
 12.40 
 
 12.75 
 12.67 
 12.67 
 12.67 
 12.67 
 
 12. 18 
 
 12.82 
 12.82 
 12.82 
 
 n-95 
 H-95 
 "95 
 12.31 
 12.13 
 12.13 
 12.13 
 12.13 
 12-99 
 12-99 
 14.01 
 14.01 
 13-53 
 
 12.27 
 13.12 
 13.12 
 12-35 
 12-55 
 12.76 
 
 12.53 
 12-34 
 12.48 
 11.94 
 12.08 
 12.42 
 
 12.43 
 12.81 
 12.83 
 13-42 
 13-42 
 13-56 
 13.10 
 12.89 
 12.93 
 13.16 
 
 13-19 
 13.09 
 
 13-09 
 
 12. 18 
 
 13.17 
 12.82 
 12.82 
 
 11-95 
 12.23 
 12.23 
 12.31 
 12.27 
 12.41 
 12.62 
 12.76 
 12.99 
 
 I3-I3 
 14.01 
 14.01 
 13-53 
 
 30 
 5i 
 40 
 
 63 
 63 
 56 
 
 24 
 24 
 24 
 61 
 70 
 52 
 23 
 46 
 46 
 34 
 40 
 
 55 
 62 
 40 
 40 
 26 
 26 
 36 
 58 
 65 
 
 21 
 41 
 
 73 
 48 
 4' 
 32 
 16 
 54 
 34 
 27 
 
 49 
 40 
 
 18 
 32 
 32 
 24 
 
 3 
 3 
 .06 
 .28 
 .28 
 .18 
 .02 
 
 .02 
 .02 
 25 
 
 45 
 14 
 .02 
 .09 
 .09 
 
 04 
 .06 
 
 i? 
 .26 
 .06 
 .06 
 .02 
 05 
 05 
 
 .20 
 32 
 .OI 
 
 .07 
 
 56 
 
 .11 
 .07 
 
 03 
 .00 
 .16 
 .04 
 .02 
 .11 
 .06 
 .01 
 03 
 03 
 .02 
 
 12.30 
 
 13-25 
 13.18 
 12.63 
 12.83 
 12.94 
 12.55 
 12.36 
 12.50 
 
 12. 19 
 
 12-53 
 12.56 
 
 12-45 
 12.90 
 12.92 
 I3-46 
 I3.48 
 13-73 
 13-36 
 
 12-95 
 12.99 
 13.21 
 13-24 
 13-14 
 13.29 
 12.50 
 13.18 
 12.89 
 I3-38 
 12.06 
 12.30 
 12.26 
 12.31 
 12-43 
 12-45 
 12.64 
 12.89 
 13 05 
 13-14 
 14.04 
 14.04 
 13-55 
 
 12.38 
 
 13-33 
 13.26 
 12.71 
 12.91 
 
 13-23 
 12.84 
 12.65 
 12.79 
 12.60 
 12.94 
 12.97 
 
 12.75 
 13.20 
 13.22 
 13-73 
 13-75 
 14.00 
 
 13-63 
 13.22 
 13-26 
 13-46 
 13-49 
 13-39 
 13-54 
 12.92 
 13.60 
 
 13-31 
 13.80 
 12.31 
 12.55 
 12.51 
 12.56 
 12.69 
 12.71 
 12.90 
 I3-I3 
 12-94 
 13-03 
 13-77 
 13-77 
 13.26 
 
 R Comae 
 
 R Comas 
 
 RU Herculis 
 RU Herculis 
 RU Herculis . 
 
 RU Herculis . . 
 
 RU Herculis 
 
 RU Herculis 
 
 RV Herculis .... 
 
 RV Herculis 
 
 RV Herculis 
 
 RV Herculis 
 
 S Lyrae 
 
 S Lyrae 
 
 S Lyrae 
 
 S Lyrac 
 
 SCveni 
 
 S Cygni 
 
 SCvsmi 
 
 S Cverni.. 
 
 V Delphini .... 
 
 V Delphini 
 
 V Delphini 
 
 V Delphini 
 
 Z Cassiopeiae .... 
 
 
 Y Cassiopeiae .... 
 Y Cassiopeiae 
 
 Y Cassiopeiae 
 
 Mean 
 
 12.90 
 
 13.02 
 
 
 
 
 
 
 
 
 6-INCH, OCULAR 20O. 
 
 RV Herculis .... 
 RV Herculis 
 
 99 i 10 
 99 7 8 
 
 OO I 2O 
 
 99 i 4 
 99 10 2 
 
 3-4 <s 
 3-4 <* 
 40 
 
 k 
 Kk 
 
 12.67 
 12.67 
 12.67 
 12.99 
 12.99 
 
 13.16 
 13.16 
 
 I3-I9 
 12.99 
 
 13-13 
 
 56 
 16 
 68 
 32 
 29 
 
 .18 
 .00 
 39 
 03 
 03 
 
 13-34 
 13.16 
 I3-58 
 13.02 
 13.16 
 
 13-59 
 i3-4i 
 13-83 
 12.91 
 
 13-05 
 
 RV Herculis 
 
 Z Cassiopeiae 
 
 Z Cassiopeiae ..... 
 
 Mean 
 
 13 25 
 
 J3-36 
 
 
 
 
 
 
 
 
192 
 
 RESEARCHES IN STELLAR PHOTOMETRY. 
 
 TABI/B 119. LIMIT OF VISION. Continued. 
 
 12-INCH, OCULAR 67. 
 
 Field. 
 
 Date. 
 
 Estimate 
 
 Magnitude H. 
 
 Reduction. 
 
 Corrected Magnitude. 
 
 Star. 
 
 Limit. 
 
 Z. 
 
 Cor. 
 
 H. 
 
 P. 
 
 RV Herculis 
 
 y m d 
 04 8 ii 
 
 4<a 
 
 13-30 
 
 13.86 
 
 26 
 
 .02 
 
 13.88 
 
 I4-I3 
 
 OCULAR 80. 
 
 W Andromedse.. . . 
 Z Cassiopeiae .... 
 
 03 10 13 
 
 00 2 25 
 00 2 25 
 
 2 
 4<fc 
 
 1<X 
 
 13-34 
 12.99 
 
 13-38 
 
 13-34 
 13-55 
 I3-5 2 
 
 70 
 48 
 48 
 
 45 
 . ii 
 . ii 
 
 13-79 
 13.66 
 
 i3- 6 3 
 
 14.20 
 13-55 
 3-52 
 
 Z Cassiopeiae 
 
 Mean 
 
 13 69 
 
 13-74 
 
 
 
 
 
 
 
 
 OCULAR 275. 
 
 V Andromedae . . . 
 R Comas 
 
 98 7 25 
 oo 4 4 
 oo 4 4 
 oo 3 7 
 oo 4 4 
 oo 4 4 
 oo 4 4 
 oo 4 4 
 oo 4 4 
 
 OI II I 
 OI II I 
 
 C 
 Y 
 i</J 
 
 w' 
 w' 
 
 ,3 
 V 
 8-10 <z 
 
 a 
 
 3<y 
 
 at 
 
 13.82 
 14.17 
 14.08 
 14.68 
 14.68 
 
 14-75 
 14.26 
 12.82 
 14.01 
 13-50 
 13-73 
 
 13.82 
 14.17 
 14.22 
 14.68 
 14.68 
 
 J4-75 
 14.26 
 14. 10 
 14.01 
 13.92 
 13-73 
 
 46 
 34 
 34 
 40 
 
 22 
 2O 
 2O 
 4' 
 41 
 51 
 51 
 
 .09 
 .04 
 .04 
 .06 
 .01 
 .01 
 .01 
 .07 
 .07 
 "3 
 '3 
 
 I3-9I 
 14.26 
 14. 26 
 
 14-74 
 14.69 
 14.76 
 14.27 
 14.17 
 14.08 
 14-05 
 13-86 
 
 14.20 
 14.56 
 H-56 
 15.01 
 14.96 
 15.01 
 14-52 
 H-59 
 14.50 
 
 I4-3 1 
 
 14. 12 
 
 R Comae 
 
 RU Herculis 
 RU Herculi'; 
 
 RV Herculis 
 RV Herculis 
 
 S Lyrae 
 
 S Lyra 
 
 V Delphini 
 
 V Delphini . . 
 
 
 14.27 
 
 14-57 
 
 
 
 
 
 
 
 
 40-INCH, OCULAR 237. 
 
 V Delphini 
 
 02 4 12 
 02 4 12 
 
 4<A 
 2-3 <7T 
 
 16.2 
 15-2 
 
 16.7 
 15.6 
 
 62 
 62 
 
 .06 
 .06 
 
 16.8 
 15-6 
 
 17.2 
 15-8 
 
 V Delphini 
 
 Mean . . . 
 
 16.2 
 
 I6. 5 
 
 
 
 
 
 
 
 
 OCULAR 350. 
 
 RV Herculis 
 
 02 2 5 
 
 6<k 
 
 15-50 
 
 16.25 
 
 51 
 
 13 
 
 16.38 
 
 16.63 
 
 OCULAR 450. 
 
 V Delphini 
 
 oo 10 16 
 05 ii 18 
 
 !</ 
 
 5-6 <t 
 
 15-3 
 
 15-48 
 
 16.1 
 16.25 
 
 34 
 16 
 
 .04 
 .00 
 
 16.3 
 16.25 
 
 16.6 
 16.50 
 
 S Cveni . 
 
 
 OCULAR 750. 
 
 V Delpbini 
 
 oo 8 29 
 
 i<M 
 
 16.2 
 
 . 
 
 16.7 
 
 Si 
 
 13 
 
 16.8 
 
 17.1 
 
 
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