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Technical and Bibliographic f Aes I Notes tech niques et bibliographiques 
 
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MICROCOPY RESOIUTION TEST CHART 
 
 ANSI unil ISC If-' CH.\»' No 2 
 
 1.0 
 
 1 
 
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 III 1.8 
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 ^ .-IPPLlEn IKA^[3E tnc: 
 
Vfc' 
 
 PUBLICATIOXS 
 
 Ol" TliF. 
 
 DOMIXIOX OBSERX'ATORY 
 
 oi'iAW \, ( \.\.\I).\ 
 
 \\'.- IV, \.,. 7 
 
 CAl 
 
 MT 403 
 P04-07 
 
 oiiiiiT OF '['UK si'i:i'ri;<i>( (UMc lUXAin' 2't cam- .ma.^ohfs 
 
 I.V V. I HAri'KU, M.A. 
 
 'ii.i--tai- !<>= 7 14' . 0= - ■_*) Li:;', \i-. ina--. 4 77) u:i- aiuio'iiin-d a~ a >\)irtr<t- 
 M-...i.- hinary* In IV)l.--,)r TnM. dinTtor of !!:<■ Vrrkr- Oi.-rrvaforv , in .Maid.. I'.tMt;. 
 Hi- ivM!il-.(lcpfii;lc,i chiefly uiioii //-, ami the i;t"liuiii lin.',\4471, aa.l tiic f.^iir c,l,-riva::on- 
 gjivc a iaiii;i in vcldcity tVom - ;! to - l'4:J km. p.-r MM'ond. 
 
 In iri-,„r,l r,V,--/;„r,s \o,. Ki, 17 ;,nd li'J, I'rnfc^v.r ]•;. ( . Pirkcrin- callp.l a(!.>iiti..n 
 f.) t;i" prc<rn"i> in tli(> spoctni;:! <<{ the line- charactiTi-.ti.' uf the .-tar j-Pii[)pi-. Mi-, 
 Cannon ha- nia.lc it the tyi)ical .-tar of ( las^ Oc. and a lirtailcd ue-cription of it- -ixTtiuin 
 niay I.- had in Unnuni .\i,„„l<. Vol. X.WIIl. pa-jcs l4S-l.-,n. It will sufliir hero 
 to -ay tl'.at. in addition to the -vnular iiydionvn and hclinni ah-orj)tion litic-^ an<l the 
 additional i" I*iii>pi- -f^n.-s of hydrofivn alxoriHion lines ih.'re are aNo emis.-^iou hand.s 
 The-i> m }j>'ii"i'al an- aot pronounced and. e\c'>ptin!j that at X 4t;s,'-!, would not arn>-t 
 the attention in a ca-ual glance at it- -pectniir. Th.> eini-.<ion line at \4(i:« doe- not 
 show upon oiir plate-, hut there do.'s -eem to I." an enii-ion hand >tret<'hinn- roiiuhly 
 fioin X4ti47 to X4tii;!l and this haml appear- a- though l.i'okcn by alj-orption. The 
 al.-orj.tioii line X 4:)4-J i-^ th-nked hy eini-ion n..t only on the red e.lfje. a.- . :i<- ( annon states 
 in her de-,Tiption. hut on the vioi(>t eM.o;c a- well. Owinu^ t.- the low altitude o! the >tar 
 (meridional altitude 21)) th.- p'iate> are not of tiie he-t. particularly in tli(> violet reiiiou, 
 and it would he worth while at <oni.> ohser-.atory in the southern henii-ph.ore. where 
 better plates ,.an he >ecure.l. to redet,>rinni" it- orbit. The elements friv,.n hen> are 
 rcifardeil as pro\-isional oni\-, 
 
 ()b-ervations were conunenced on t'lie -t.ai- i;i Xo\eiiil)er, KM."), as it was felt that its 
 unfavourable >oi;tli.'rn declination aiul poor specfrun. would be otVset by the lar^e ran^e 
 in velocity. The first plat.' increa-ed the alre;idy lartie raufje by showing a vidocity of 
 rece<si.)n of ll<» km. per sec. and later piate- have further increas<-,l the range, so that 
 now this star, s„ far as the writer i- aware, shows the largest range in velocity of any 
 spectroscopic binary yet known. 
 
 In our latitude it is necessary that the star l)e photographed while near tlie meridian 
 -^ nd alt hough it has been kept well in mind during the two seasons since work wa.s coni- 
 
 *A.str()ii|[ysir;il .Juurrial, vol. xxiii. \nit,i' 2(i.'. 
 
11*; 
 
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 liiciHcil, yet Lilly Jil pialc- !i;f. i' \<vi]\ -I'lMncil in 'iial liiiir. '^!aii>' of \)ic-i- arc ii"' <.f 
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 -100] 
 
 -lH4j 
 + 41 
 
 - 72 
 
 -1H4J 
 -111) 
 
 - 7.5] 
 +237; 
 
 - IWi 
 -180; 
 
 3 
 (i 
 4 
 4 
 
 4 
 4 
 
 3 
 5 
 3 
 
 31 
 
 •»i 
 2 
 3; 
 3 
 3! 
 
 "i 
 3l 
 
 Vrf. O-C Chariictfr of 
 
 + 9 
 
 - H 
 -20 
 + H 
 + 9 
 
 1 I 
 
 -12 
 -31'. 
 
 + 4 
 
 + lli 
 
 _ •>i 
 
 -nil 
 
 + 3i 
 + « 
 
 +:io 
 -39 
 
 + 15 
 + 1 
 
 + 3 
 
 + 1H 
 
 +- 0: 
 + 102 
 -243 
 
 -202 
 + 109 
 
 - 4fS 
 +200 
 
 +207 
 -I.W 
 - 192 
 - 27 
 -230 
 
 +■ 
 + 
 
 +2551 
 -20f> 
 -235 
 
 + 2s'fiimt 
 + 2 iKKir 
 -4l)'riiiiil 
 
 -.Wj 
 -43;|)oor 
 
 +t'>2 proiiouiu-ed 
 -19 
 
 + 10 iMxir 
 
 + :)5,fiiir 
 
 + 2f-iir 
 
 +94 pronounced 
 
 - 29i pix/r 
 
 - 4s!Kood 
 
 +23:fair 
 
 - 5! 
 
 — 7« no i-oulriust 
 
 The foregoing tables give the data of the observatiou.s and are for the most part 
 self-explanatory. The phases are reckoned from the periastron passage finally adopted, 
 
V2'2 
 
 PiUI. [CATIONS OK T:\V. DOMINION OHSKKVATOUY 
 
 u.miim; the period A 'MU days whicli was arrived at hy a ('(miparisoii of tlii early observa- 
 tions with our own. While the velocities were earried through to the lirst decimal place, 
 they are here rounded off as the decimal i)!ace has no si;inilicance in measures of a spectrum 
 of this tyi)e. The probable error of an averap' ])late obtained from colunms () and 7 
 of the table is ± Itll) km. jier .~ec. The probable errors of the elements are, happily, 
 not of corresponiliiiK mannitude, thanks to the larne range in velocity. 
 
 While the emi-sion lines have not been used in the determination, they i)artake 
 of i)eriodic displacement:- due to the star's orbital motion ju.-t as do ttie absorption 
 
 lines. 
 
 The velocities (juoted are for th(> line at the assumed wave-length X 4(i,S7r)3t;. It 
 would seem from an examination of the i)lates, that the centre of tnis emission band 
 shifts somi'what to the red when the emission is more i)ronounced. On only one of our 
 plates is tlie A' line discernible, and its jiosition would lead one to exjjcct that it does 
 not share the great range in velocity shown by tlie other lines. 
 
 The twenty-six observations were grouped into ten normal places and after prelim- 
 inary elements were taken, a least-sciuares solution was carrietl through giving i^inall 
 corrections to these values and with a reduction of 11 per cent, in the value of l^pw for 
 the normal places. 
 
 These preliminary elements were: 
 
 
 
 F 
 
 = 
 
 4-3934 days 
 
 
 
 
 
 
 
 
 
 e 
 
 = 
 
 
 ■\ 
 
 
 
 
 
 
 
 
 0) 
 
 = 
 
 40= 
 
 
 
 
 
 
 
 
 K 
 
 = 
 
 21S km. 
 
 
 
 
 
 
 
 
 7 
 
 = 
 
 — 
 
 12 J km. 
 
 
 
 
 
 
 
 
 T 
 
 
 J. 
 
 D. 2,417, 
 
 NOHMAL 
 
 240-259 
 PLAt'Krf 
 
 
 
 
 
 
 Mean 
 
 Mrun 
 
 
 
 
 
 
 M.-;iM 
 
 Mc:iii 
 
 
 
 
 Phase 
 
 Vcluiily 
 
 W. 
 
 iKht 
 
 O-C 
 
 
 
 Phase 
 
 Velocity 
 
 Weight 
 
 O-C 
 
 1 
 
 ■ 4.-J.-) 
 
 + S-() 
 
 
 3 
 
 -1.". it 
 
 
 
 
 ■J (l.-|l 
 
 
 1-0 
 
 + 4 1 
 
 o 
 
 DST'J 
 
 -1()J7 
 
 
 • 11 
 
 f l:i 11 
 
 7 
 
 
 ;!t»7s 
 
 + :,;•'! 
 
 !■() 
 
 +5 '2 
 
 3 
 
 1 21)0 
 
 -]'M-2 
 
 
 ■',1 
 
 -lii'.t 
 
 ,H 
 
 
 ;i:i4s 
 
 + i(«:i 
 
 ••> 
 
 -1-2 
 
 1 
 
 1 474 
 
 -IWIS 
 
 
 4 
 
 fll-.-) 
 
 9 
 
 
 :i s4<i 
 
 +-Jir>(i 
 
 in 
 
 -2-9 
 
 5 
 
 2:a2 
 
 -14ti-9 
 
 
 ■•-' 
 
 - 'Jfi 
 
 10 
 
 
 4-3<)0 
 
 + PHN 
 
 i:i 
 
 + 3-0 
 
ORBIT OF THK .sriX'TKOSCOP'C IMNAHY 20 CAMS MAJORIS 
 
 123 
 
 The J.ehmann-Filht's fdrniula was used and making the transformations, 
 X = 6y 
 
 y = 5A' 
 
 z = KM 
 u = K.bu 
 
 the observation pciuations were: — 
 
 — 
 
 I 
 
 y 
 
 z 
 
 u 
 
 I' 
 
 
 1 
 
 1000 
 1000 
 1000 
 1000 
 1000 
 1000 
 1000 
 1000 
 1000 
 1000 
 
 + ^137 
 
 - •504 
 
 - ^778 
 
 - -872 
 
 - 553 
 
 - ■2(iS 
 + -214 
 4- ■549 
 + 10C.0 
 + •OOS 
 
 -•S(>7 
 
 -•8;w 
 
 -001 
 
 + ^t)2() 
 4- -584 
 
 - 031 
 -■8.35 
 
 - 003 
 
 4-iir. 
 
 4-^807 
 
 -1101 
 
 - -882 
 
 - -520 
 
 - -204 
 4- ■r.34 
 4- ■SU 
 4- ■SOS 
 4- ^802 
 4- -247 
 
 - ^723 
 
 4-1-210 
 4- -784 
 4- .371 
 4- ■080 
 
 - -.520 
 
 - ■ iul'i 
 
 - -821 
 
 - ^832 
 
 - -408 
 4- -834 
 
 4- 00 = 
 
 2 
 
 -io--.=o 
 
 3 
 
 4-lf.-4 = 
 
 4 
 
 5 
 
 -120=0 
 4-14 = 
 
 6 
 
 4- 0-5 = 
 
 7 
 
 - 0^(> = 
 
 8 
 
 4- 41=0 
 
 9 
 
 4- 32=0 
 
 10 
 
 - ti-2=0 
 
 From these observation equations were derived the normal equations: 
 
 0-onn.r - -OSS// + •r)r)22 + ■03.'?!/ - •702c 
 
 + 2 970 = 
 
 4- 925?/ - -2452 + ■V22u - •02(3r 
 
 - 1 383 = 
 
 3-6572 - -SOS?/ + -931!' 
 
 - 1-360 = 
 
 4 •1651/ -3 946r 
 
 -f22^ 165 = 
 
 3-86Sr 
 
 -20494=0 
 
 The corrected elements, with their probable errors, are then the following:^ 
 
 P = 
 
 r = 
 
 w = 
 
 A' = 
 
 7 = 
 
 T = 
 
 n sin i = 
 ??!,' sin'' i 
 
 4 -.39.34 days 
 
 •1.56 ± -017 
 
 37" -64 + 4° -95 
 
 218-44 km. ± 314 km. 
 -12- 12 km. ± 2-28 km. 
 .J. D. 2,417,240248 ± 061 
 13,035,000 km. 
 
 = 4^58 o 
 
 (w-l-n/i)- 
 
 The curve shown represents the final elements with the observations as grouped. 
 
 Dominion Observatory 
 Ottawa 
 
 May, 1917. 
 
124 
 
 PrBLICATlONS OK THK nONtlMON (IRSERVATORV 
 
 Days 
 
 ■2 3 
 
 Velority Ciirvp of 20 Cams Majoris 
 
 fililM 
 
 3 T33M OQOblSOb 
 
CAl 
 
 MT 403 
 P04-07 
 
 1 5 MH 1999 /is^ 
 
 i)