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Les diagrammes suivants illustrent la mdthode. 1 2 3 1 2 3 4 5 6 MICROCOPY RESOIUTION TEST CHART ANSI or.(1 ISO TEST CHART Ncj ^ 1.0 I.I ii2.8 12.5 132 12.2 12.0 1.8 .25 mil 1.4 1.6 A .-IPPLIEn ItVMDE Inc vt^^ -r PUBLICATIONS DOMINION OBSERVATORY OIT.WVA, CANAIXV Vol. IV, No. 12 THK SI'WTROSCOI'IC RIXARV BOSS 1275 HV J. H, CA.NNO.V, MA. Boss 1275 (« = 5'' Iti"', 5=+2!P 20', spoctral typo A, mag. :)-7) was discoverod to bp a si-pctroscopie binary at Mount Wilson, and tlio nicasuros of six plates were .sent by Dr. Adams to this o>)scrvatory in OctohiT, lOlfi. Of these, two plates showed the eomponents .separated and the other four the spectra were superposed giving one measure. Forty plates were taken here. The lines appearing were: — 4.i72-1.56 (1) 42. 30.SS 1275 CAl MT 403 Plato Juliiiii D;iy I'liase r, "' r, R. V ^^M 7832 2.421.i:!S-70 140'81 141-89 143-75 167-81 173-80 100-70 2i7-85 227-63 251 -.58 351-04 250 -.52 2.50 -.58 262 - 54 266 -.53 1 270-67 1 24 23 26-23 27-23 1-75 25-83 4 40 21 30 20 00 3 -.30 0-iK) 06 7-80 7-86 10-80 14-80 1 18-90 + 100-1 + 98-7 + 129-6 - 6 -2H-3 + 5-6 -1.39-5 -118-1 -137-1 — 7-5 +:i6-o + 4-9 7845 .. . 78.53 ^■^^H ^^1, 7802 -23 ^^^v 7886 + 128-7 + 1-7 -129-3 +22-7 ^^■^ 7893 7918 7960 7969 8009 -23-2 + 19-8 -21-5 -10-8 ^^H ^^H ^^1 ^^^^H + 91-7 + 88-8 -127 -111-1 -114 1 -100-6 . . . + 6-7 + 6-8 -31 -14-1 - 91 -20-6 - 149-4 -114 1 + .53-6 + 64-7 + 127-6 + 66-6 -.37-4 - 6 1 -14-4 - 4 3 +51-1 + 15 -6 8010 8016 ^^H ^^^^^H 8017 ^^^^^H "i032 ^^^^H 037 ^^^^H ^^^^^H «40 63S18— 1 BlBfll -27-3 ^m 185 P04-12 ECOLE POLYTECHNIUUE BIBLIOTHEOUF 180 n 1(1,11 A TK'N" (.1- lilt. l)ii\llNln\ OUSI.UVVIOHV ((ITAWA (iHSIliN \rii)N> «il' It""*'^ >7."l Cnlirltl,lrtl I ECOLE PULYlLUHNiyUt BIBLIUlMtOUE Tin; si'Kc rKoscoiMc hinauv im>hs ijt:. 1S7 MEVrtrUKS OK HOS.-' r:7 7.s:i'.' |..* 7M12 »' 7H4.'i I 7.^ !.■>». 7H.-..'l [ 7x.'.:i'^. 7H)-,2 X 1 Vcl \VI V.-l. \Vl Vrl. \Vl Vol. \VI Vrl \\l V.I. \Vl V.I \\1 l.'vlO 7(>t> + Cm US -201 20 + m M 1 -177t>0 - 2.-. 72 - 7;i f.2 1 1 IIKI XM) + 72 02 -ISOliO • 4- .52 10 I 4 -nu-201 1 -(-121 CO 4 - l-)7-70 i IIHO ti;t4 + 7'.i 7n -120 10 + 00 to 1 4 -12li'.H) J i + '.»» 40! 1 - l.-i7-2.'> ' Weighle <'l 111! IX'MIM'iN i (ItSLRVA lOUV MK.\f*l KKS Ot lUlSS Vi'.'i-l'iDtUuiuil TKSC, |. 7SM\ 1 7Ho;i 701S 7',K'>t:i:i H'.':. 1 - J IK! 1 - 1 o;i i 1 f HIi JO 1 \\ rIKlltcil . |(K IK 1 10 7.-. - to r.i + 10 11 - IC. sj - 1 :« + 112 no V, , I'.l •>■■<. 4 10 m + 17 :..■> 4 s:i 1 IS - !» 'JO - JO (Ci V, + (V_> t- 11 OJ t- 01 + nil -M + 04 + (It Curv. - (1 'JS ^ JS - II '.'H - 'Js - JS - is - n 28 Kii.lml Volorily + 1'2S 7 -ijo :i - ■-'.■!■.' + 10 s - 'J1 -. - in 8 + 91-7 iiii; si'i;< iHH>( (H'K iii\\iiv moss i.'t:. 180 Ml \>l HI S (ll lt<»S l.'T.'. Ci.nt,?,,,,,! 4IH1 IIMI 4;iii) I'll r.'7i "tKi tJIHI llKt 42(l'.' I'U 1 1 i:i i.t.'s 101.') '.t7.'. \\(inhli'>l Iltiiliul Velocity \,l \\i Mllll |i V.l Wi KN) 10 7(1 «^] -111 :«) f- 1(11 1(1 « 111) Id: +-1'.'') sol 1 l.Ki Jll! t- SI HO: s( 1 1 1 1 ' \rl Ul IJ'MHi ■ JO (t;i O III JS U'J 4 rlO't Hi - JO o;i - (17 - JH + S8'8 - l():t 4(1 - li:i so - io;i :iO; -107 70 - 7H is' - (Ill (M sold |. \ . 1 W ( 110 40 h 10 72 70 S.-1 ;!o| -i 7(> 70 - JJ ",»1 f 0(17 - OJS S017 1. V.l Wt. f (HI 10 + WO S7 ■ S,') J J HI (II ■ JH -111 I f h7 yj - JJ '.II - (I (14 - JH + 04-7 190 IM lu.K \riu.\.s ui nil. i«)MiNioN mi.-*Kiis \r<«it\ MliAiiLUtiJ 1)1:' U1J.S.S l:i7i ( .jii(i»m../ IIM UNI 1. 11(1 oil ijyi '.'i.'i llt:i '.•.;>^ nii':tn V. \. Ci rv Vi'loalv sii:v.' p \ .1 W I ',p| III 'II 1.1 1 \.i Wt t ITii HI t i.tc; III t 1 U sll ll'l (ll 4 ■ III 111 ; Wl. I -J 1(1 i t ('H 1 I I"' i l(i Id \ Id IJ' I - II (Hi - JCi 4(1 - (I II - d'.'H - r ;t 2(j s I :i:i ■Jil ■ 77 d J7 d JH 31 7 Till S Sl'l ( lit >« til'H IU\ MM IK'-^ I-'" 191 MTASl llt> t>l UtixS l>';i- CaiUittuiit Vrl \\l tlM «""• 4:iH:t T.'ii i:utM'>-i> :i'i:):t h.'.') W.intil'-"' t * 4 V, ''iirv. Uiuliiil VflocllV II ti NdS'l |l \.| Wi Ui jii :ii JT 11 II in It JH IT s ID.'i 71), '.Hi 7:i J'p II II II II -S IJIi , 1 IS '.HI 1 , 1, 1 1 i:. i t HI liN i S.' Ill ^'1 It II II II Js MIIJ \.l \\i ' !• ss ',11 t 1 is s.s t ji IK.I t HI .'iH ."J 7.'i - II 117 - II Js - 10 fj Ai 1,1 11 111 iiy U ii:i .".t 7."i II ihl II js -t- II '.I II I . I' V.l Wt t 1^1 III I NT '.IS + 711 117 Jdilil - II Si - II 'JH t i:. 'J sill' \.l Wt. 'I.'l i.'i mi Ht) 'j:. '.rj \\i ■Jd ■.".I lUi (I SS JH r.>2-7 1 ',)•_' riuLiCATiuNs or riii': dumimon uuisehvatokv M1;A.SIU1;S or doss l27o—Cuntiniinl s|17i. M17- ,si:!Ol), Vrl. \Vl SKlOf s:'2.'i .s;i29 p. ,s:)29 «. ■V 1 \ . I. ' Wi V,l. \\l V.l. \Vt V.l. \Vl. i v.l. :\Vt. V.-l. \Vt. 41-nI 9KI i-i:i:, 2(1 1 - 70 11 « -lo.-iiio ; + 1S1--10 - 4s-.-,s 1 + 30-:!2 J -140-SO 1 4:iMi 720 - .-,.-, 19 i i:',4o ii:i4 rlli7 4ll ; - 49 OS 1 - 12 40 i -t 21 :!-■)( ' + 71 o:! i -114 so 42:i;i:;-'s rlltvi ; - 00 :i2 * + ■)4-;io 1 J19.S-494 404."i 97.') + 120(iO i t ;i9:i;i • n2.') + i:iooo i 1 - 90-40 ' - 47-70 i + i;!7 :io 1 iin;iii + 127- 00 - 29-44 - 7s-;i:i - 29-11 - 0."i 1") - 2s -09 + 177 40 - 2s -09 - ol-sS + 24 S9 + 49 49 + 21-77 - SO SO -T 21-77 v., - It - 14 - 0-19 - 19 ^ ()4 - 0-ir. - Ij ( urv. - 2S - 0-2S - 0-2S - 2S - - 2S - 0-2.S - 0-2h H:iaial Vi'ltiiity r 97 7 -lOS 2 - 9;! -7 + 14S-8 - 27 3 -, 70-8 - 5S-5 THF. Sl'KCTROSCUPIC BINARY BIJSS 1275 193 MKASUUKS OK bUSS V>7r,-('outtiiiu. 8333 s. 8341 p. 8341 3. 8372 p. .s:i72 ». 8;i70 \ V.l \Vt Vel. \Vt Vel. \Vt. Vel. \Vt. Vel. \Vt Vel. \Vt Vel. \Vt. -133-40 -143 80 - 89-72 t + 01-04 + 01-71 + 80-00 I 4 1 -105-20 4 + 49-00 + 09-15 + 09-21 i 1 4 -122 30 -121-50 -137-00 ■ 4 2 4 - 38-43 - 01-32 1 4549 7011 4481-400 + 133-80 1 4 i 4383 - 720 4 4340 034 4233 - 328 - 80-75 I + 111-30 1 , 1 Wi'ightwl mean V„ Ciirv. -122 31 + IS 00 - 0-15 - 0-28 + 07- + 18- - - 78 00 15 28 3 - 105 20 + 10-77 - 0-10 - 0-28 + 04-28 + 10 77 - 0-10 - - 28 -110-73 + 4-95 + 0-27 - 0-2H + 122-55 + 4-95 + 0-27 - 0-28 - 49-87 + 2-81 ± 0-00 - 0-28 Kuiliiil Velocity -104 7 + 85 - SS-9 + 81-0 -111 8 + 127-5 - 47-3 194 I'rUI.ICATlONS or TIIK 1X)M1N1<)N OBSKUV.VniKY MKAtJl'KLS l»K l«»f'''< \2~'>-C'"itiiiuc(l MiSl I SliSl s. V.l. \\t V, 1 ; \Vt 4:i4',t7llli + 112 "iii . - l + :i:i^: - i;i;!2; + 2.')-7'.t' s4;i:i p. - 70 SS + 22 + 04 - 2S 70 S :!7 ■ ; •• 1 1 .').". 01 2S - 4 44HI 4(X) 4;i40 ti:u 4-.'7 1-700 Wiinhtttl iiifan Va Ciirv. + 149 10 + UL' 40 + 1>2 IK) H40H p. V.l. \Vt + 1 111 12 - 2s:5(> - 14 - 0-2S - i()-."i;jj + 22 ((2; Iti IK' Kudiul Veloiily ( + 00-3 V.'l. I Wt + 7-22 - 2>t ■.■>() - 22 - 0-2S fl."-.™ + lie- 70 S4<.H) p. H4i»0 s V.l. Wt + ir.i 70 + 1202 (X) - 2it-70 - 23 - 0-2H + 121- + i;i9-30 - 27 19 - 22 - 0-28 \V1. til + 1 1 1 t> 97 -sr) 27- 19 22 0-28 Wt Vi-1. Wt. -12'.') 7 111 2t)0r. 28 0-28 :!4 2 lUG I'LULlCATIONS OI Tin-: DOMINION OHSKIiV ATORV n..> f..rty plates wore grouped s,, that, inchuiing the eo.nnu.n p,.ints where the spectra were superposed, there were eight n„rn.al phices for ea.'h curve. At first ea.^l, '•'""•.ouent W...S „.,.at<.d separately. Preli,uinury eien.euts were elu.seu ...r eaeh and a east-squares s„ha..,u ..arrie.l through in eaeh ease. The resulting elements were as loilows : P = 27-43 days fi = -384 t-i = 173 wi = ;it)° 02 «• = 2U>°-45 7i = -27 03 km. 7j = -2()1 km. V'l = 2,421,142oJ.lX Ti = 2.421,142 7. J. b. A', = 122 4 km. A. = 117 km. It will he .seen ,ha, the greatest differences oeeur in the values of . and >, ami that Z ~ " """"" ''' '"'" "'" '"'■^^^^"''^' '^'••■^^'>- "— "- --'-is in t^;; with'^tlr ''f ""';/'■'"" "" ^'^^^^ ^--*'"">t are given below, an.l can be eon.pared \vith those from the elements obtaine.l by combining the two. -N umber ■f 8 - 7 9 + 8 2 - 4 + 1 y - 2 •f t) u - 2 4 R, - 9 + 3 1 - 10 4 + 7-1 - i;i-7 + so + 2 1 + 0-2 The two sets of elements were then combined and the mean values Of c a, y and T taken as prehmmary values for the two curves, the values of A", and A'., bei,^ a;.celd as prehnnnary values foi them. Two least-s,,uares solutions were fon,„rt, in order to obtain the closest approxin.ation. These r^Xd" JofZ! " """"" I' = 27 43 days 7 = -14- 17 km. A.'i = IKj'Jl km. A', = ll(j.l2 km. e = -247 rtii; si'KCTKoscdi'ic din ah v lioss ij?:, 197 w, = 2!)^ so «•. = 20!)" SO T = 2,421,142 00 .1.1). fli sin ;■ = 42,730,000 km. a. sin i = 42,440,000 km. mi sm' I (nil + 7n)- = 40 O The normal plares and thrir residuals aro now; — Number 1 2 3 4 S 6 7 8 I 'ha r, ff, 23-76 26 76 106 306 7-26 U-46 r4 26 !9-66 + + + R3-2 119-7 87-2 22-8 109 113-2 84-8 22 3 11 9 4 1 6-6 26-9 17-0 9-4 8 18-3 r, 114 6 128 2 107-,'') 22-8 66-6 10.5 3 7,5 9 22 3 The.se residuals are much larger than those obtained from treating the components separately. However, it is not at all probable that the stars are separate systems, but are two stars of the same system and must therefore have a common 7, e. u and T. The lines measured are in nearly all plates poorly defined and few in number, and it is possible that a larger number of plates might have been more satisfactory. The Mount Wilson plates from which the binary character of the star was discovered, do not give velocities which fit the curve well. However, the observations obtained here indicate that this period— 27-43 days— is the correct one, and the elements found are probably a fairly close approximation to the true ones. On the curve, the double circles are those normal pLces common to the two components. The values of A'l and A'^ are practically the same, and the stars are hence about equal in mass. The lines where separated also show that there is little differ- ence in brightness. Dominion Observatory Ottawa August, 1918. 19S IMHMCATIO.NS OK TIIK IKIMINION OHSKHVATOUV + 140 1 -flJO X" ^ 4100 U ® / ^ +eo \ / Id \ -t60 \ _g- ~^^ X B 1 \ + 40 \ \ V- ■ / 7 t — \ +20 \ /■ \ \ \ ' '\ f / \ -JO \ 'Y \ -40 ! T— \ / \ r -60 / / -i \ / \ 1 -00 1/ / \ V /\ \ V 1 -100 ~Jr r- 1 \ ^ \ 1 1 -120 P r 1 1 e "^ © ■f 1 -143 f- 1 V \ »/ -160 - \. / Dlys2 1 6 8 1C IS 14 16 18 2( ) ?■ > 9 1 Of Ridiil Valocity Curve of Boss 1275 fCOLE POLVTECHNIQUE OE MONTREAL 111111^11'! 3 133M DODblSO? fl CAl m 403 P04-12 ^ ^ Mli 1399 /^