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IV, Nil. 14 onniT OF Tin: si'i;('ti{()S(()|'ic iuxauv boss ;5,-,ii itv w . i:. iiAHi'i:!;, \i..\. This star (n= i:{'' ;{()•", 5-;{7 42 uas aminiiiiciMl a ~|)cc(i'(i-.c<,pic binary hv Wright b an.l Ali.-n in /./,/,■ Oh.^nrahn, l!"llin-l,.-pri.ni iiHtruin.'Mt. thi< raiiirc is rather small hir successful work on the star l.ut in this cas.- the small variation in velocity is olTset hy an excellent F type spectrum, the lines of which can he vry accurat 'ly measured. For this rea.son it wu.s j)laco(l on ttie programme. T! e star's i>hototira|)hic mannituile is ,-,■;}. Thirti two plates were secure,! in I!)17 and six in 1!)1S, and upon these the orbit is ha.sed. A preliminary value of the period was arrived at fiom a comparison of the 1017 observations with the early Lick observations. There was some uncertaintv in the exact number of cycles elapsing between the ;.,,; .sets of ol,>ervati<,n-~, and the i)eriod, accepted as be.t at that time, rcpiired a small coirecti.m in onh'r t(. suit tlie IDIS observations. While the period of Mil 100 days here det..rminc.l suits our own -observations and the 1!)0S and 11)01) observations of the Kick Observatory, it fails t,, suit their 11)0,-, observation, .so that even yet some uncertainty exists though this \alue scc-ms to be the onlv po.ssible one from the obserNations. About 1.-, or 20 lines were measured .,n each, plate. Their wave-len-ths are given in the following table, which shows how <,ften they were measured, with the re.siduals numerical and algebraic. Tlu-e are taken in the s,.nse. mean of j.late minus line velocity! There are a few whose values should in future be adjusK-d but such has not been done in the case of this star. 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I J 1 1 :i 1 lisl 1.-, 1 J Is (I 21 *^ 1 .11 2 1 Id '1 1 III.S :i'.i ;i III -, II .' 1 12 .Ml 1. \ 1.'. 7 1 ii li 1 tint :i.s () J 27 '1 1 2H 1 \ 17 2 1 Ctll.'i :.i ,i 1 1 i.i.-.i :iN 7 1 :i.s 7 i :fi .-, \ It. 1 1 2."i H 1 I.Ud .')S 7 I ; 4H.7; i 1 2 1 21 '■ } tl 2 1 f .■■.■, J t:iJ.-) 4.') h 1 I'.p :i i IH :i: i !t t> 1 27 1 ! |:t07 2:t 7; i 4 1 '. i 111 .'. 1 - 2 S J l-".il :i2 •> \ 22 t i 7 II 1 7 1 1 (■-".HI 2S ■ H i 21 ■> i 1 2 •. 1 -lis s 1271 47 h: J II '> t :i7K! 1 111 1 I 27 1 I :) 1 1 - :i It s IJtill 21tl^ i 2'.l s :t:> 4 J 20 :) 1 27 7 ! 1 .i 1 -10 (1 i 42.V) Its i It. li 1 42:«i 2» 1 1 - li 1 42;t:t 40 H 1 ;i4 2 i 1(1 :, 1 211. 1 - 4^8 1 421.-> :io:t 1 7 :i 1 22 I 1 - -.a 1 4202 ms J , 4UIH . :!7 K 1 414:1 IS :i i :i<) s i 12 1 IS 1 - IM) 1 4077 ■ 12 K 1 4071 ' - 80 1 4(m:t +41 4 1 2,S (1 +:t2-7 1 1 S-2j 1 + !)^«1 I + 28^2i } 4(M5 + 17oi 1 - 5-tl 1 WCinhtrcl Iiiciin + :t.HO.! + 2:1 •K7 + :!4 27 f If, r,() + :to (i!( + 14 12 - 7 711 V, - lit (to - IH til - IH 24 - 17 01 -- It) (Ml - 14 ICi + 12 ii:t v. ■ 20 ■1<) ■IH 2:i 21 _ .■»*> + 1:1 Curv. •28 ■28 ■2H ■28 - ^28 ■28 ■2H H.'wIIhI Vplocity + 17 6 + 48 + 15 « - !) + l.i 5 - 4 + 4-7 230 I'lMI.K ■.VIII INS OK THi: DdMlNlON OHJSKRVATOKY Mi;.\srn!'s OK utiss ■.v>u-c<""-iiiiiiii S402 Vcl Wi I'.l ^ '. - L'.'i 1 1 ; . 2 1. 1 . litii ; 14 11 ; ; 11 '.1 1 . 11 II ;. . ii :, '. -liMI 1 2N 1 ^4-7 1 S4«7 " S47!t H4He •Slllif Vcl. \ V(l. Wi Vcl. ,\Vt i Vrl, iWl, Wt Vrl. j VVt V.'l. Wt. ^I'.l tl -i Iti ti 1 : 5 1 - 1 r I r '^ J -t 7".»' 1 t:.M + t) 7 . '1 + 17 N + .ill -,-22N . tl I - liii i IN 1 i 10 () 1 1 1 1 1 1 1 I ; 1 i:,72 - 7 -21 ' - 11. II r itii + !l(l + 2l)li + if + 110 t- '.>-2 1 1 1 : 1 2 1 1 1 i:.'ii! :."ii',i :;:::;: '::,! i.-.oi 1 + !«•:} 4 + t» ■ 7 1 1 1 n->i nii> -111 — I> ,t 1 1 + 2(lti + ^ 7 1 1 n 1 :. iiiii lii'.t.- + 4-7 1 lilsii + 10-(); 1 liC.l + 7-s r ;fi + 13S + 22 4 + 1I . ',1 ii 'i - 1 + 7-1 \ cldiMly ■ 1 ■ -J ORBIT OF THK HPKCTKOHCOPIC BINARY BOSH 3511 231 The Ottawa observations were grouped acrording to phase, using tlie {)eriod 1 tU 100 days, into 9 nornial places of e(|ual weight and, after preliniiiutry elements had been obtained graphieiilly, a least-stpuires solution was carried through to derive corrected values. Mie preliminary elements adopted were: P = 1 01 100 days c = •().■) CO = 19,^)° A' = 10 o km. 7 = +7- 10 km. 7' = .I.n. 2,417,01S.OL>0 The most satisfactory solution was obtained when 7', the tin\e of jx'riastron ])assafie, was considered fixed and corrections determined for the remaining four elements, c, w, K and 7. The period was considered iletermined from the earlj' obser\ations taken in conjunction with our own. XOHMAI. I'LACKS Mean I'ha.'p Mean Velocity o-c 1 1 i;i() 1 :M4 1-521 ■14S •24ti •444 ■594 •7.^1 •)>h:{ -h .")-9K - 002 - 4-20 - .W + .')-7() + 11 10 + 1."):!,-) + 1()()7 + 1.t(« - 71 '> + -M ■•''1 3 4 - 1 (I.") 5 + 1 ■ 44 ti 7 + 04 — O't 8 9 + -IVi Making the substitutions, J = 67 2/ = 5A' 2 - K-he u = K ■ 5(1} in the Lchmann-Filhos formula, the following observation etiuations resulted OBSKRVATIOX KQIATIOXS FOR iiO.'^S :).-)! 1 No I 2 3 4 5 ti 7 8 9 1-000 1-000 1-000 1 000 1-000 1000 1-000 1-000 1-000 + -088 - -tiO:! -1 040 - -672 - -308 + -i49 + -8;}2 + •9.')0 + -812 + -848 + -434 -809 -018 729 7(M) 322 940 tHKJ + U -•97S --7.'51 -112 + -794 + ■978 + •881 + -4S7 - ■O.'i.'i -•497 -n + + + 2t)4=() - 16 = •37=0 •ti2 = -184=0 + 71=0 + 48=0 + 100 = + .59=0 2.V2 ITIU.ICATIONS III' THK DOMINION OHSKIlVATOU'i NOKMAI, KQI'ATIONS •t(io(i.i -L ^is;/ - r_'S2 + •747(i +;',sio = () 4 ,')72(/ - ■'.»4.".2 + OtlOK +2-202=1) 4 1();iz + •.')04i/ -1 •010 = 4:5Sl« -2 002 = Fnini these tli(-re resulted tlie small ei)rrectii)ns, 67 = — AC) km. 5 A' = -44 km. :,. = + .(104 6w = +4 ■().') -o that the final vahies of the elements are: P = 1 1)1100 (lays c = orA CO == lltll" ■().') A' = loot) km. y = +t)(;4 km. T = .1.1). 2,417.01S-020 « sin / = 222,500 km. »(■ sin'' / — L . = .0002 O itn + nii)- Dominion Observatory Ottawa .\l)ril. litis. Miiii 3 T33M aaobisia a ORBIT OF THE SPECTROSCOPIC BINARY BOSS 3511 233 km 4 15 +12 + 9 + 6 + 3 o- ,^ — < ^ / / \ /o / N i / s 0/' \ 1 7" \ k / 'o / 1 1 Day! 0-6 10 Radial Velocity Curve of Boss 3511 1 5 JUIN I999i^