CIHM Microfiche Series (Monographs) ICMH Collection de microfiches (monographies) Canadliin Institute for Historical Microreproductions / Instltut canadien de microroproductions historiquos ^1999 Technic? .nd GitMiographic Notes / Notes techniques et bibliographiques The Institute has :- i^-r.p'e-l ,o oblam the best original copy available fc ■.iing. F<5dtures c> this copy which may be bibliograp i. ;!.,■ iTinue, which may alter any of the images in the reproii'iction, or which may significantly change the usl h! method of filming are checked below. □ Coloured covers/ Couverture de cculeur I I Covers damaged / Couverture endomm.agee □ Covers rectored and/or laminated / Couverture restauree el'ou pelliculee Cover title missing / Le litre de couverture manque I I Coloured maps / Cartes geographiques en coule jr □ Coloured ink (i.e. other than blue or black) / Encre de couleur (i.e. autre que bleue cu noire) □ Coloured plates and/or illustrations / Planches e'Jou illustrations en couleur Bound with other material / Relie avec d'autres documents Only edition available / Seule edition dispcnible Tight binding may cause shaco^vsor cistorlicr. alcg interior margin / La reliure serree peut causer ce I'om.bre ou de la distorsicn le long de la marre interieure. Blank leaves added during restorations m,ay ac:;6ar within the text. VVhenever possible, these have been omitted from fi^m.ing / II se peut que ceriames ca"es blanches ajculees lors d'ure restaurat :n apparaissent dans le texte, mais, Icrsque ce'a e:; I possible, ces pages n'ont pas e;e filmees. n D L'Institut a microfilme le meilleur exemplaire qu'il lui a ete possible de se procurer. Les details de cet exem- plaire qui sont peut-etre uniques du point de vue bibli- ographique, qui peuvent modifier une image reproduite, ou qui peuvent exiger une modification dans la me'ho- de normale de filmage sont indiques ci-dessous. ! Coloured pages/ Pages de couleur I I Pages damaged/ Pages endommagees Pages restored and/or laminated / Pages restaurees et/ou pelliculees ■' Pages discoloured, stained or foxed / Pages decolorees, tachetees ou piquees j Pages detached / Pages detachees v/f Shov/through/ Transparence □ Quality of print varies / Qualit€ D D u te inegale de I'impression Includes supplementary material / Comprend du materiel supplementaire Pages v.'holly or partially obscured by errata slips, tissues, etc., have been re'ilmed to ensure the best possible image / Les pages lotalem.ent ou pariiellement obscurcies par un feuillet d'errata, une pelure, etc., ont ete filmees a nouveau de fa(jon a obtenir la meilleure image possible. Opposing page.c with varying colouration or discolourations are filmed twice to ensure the best possible image / Les pages s'oppcsant ayant des colorations variables ou des decolorations sont filmees deux fois atin d'oblenir la meilleure image possible. 7 Additional comments / Commen'a'res supplc-mcntaires: Coitinuous pflgindlion. This item is filmed at the reduction ratio checked below / Ce document e«.t tiimb au t.iuir r^i* rpriunmn mHjnun r,-r*r.tt lOx 14x 18x 22x 12x 16x 2nx 26x 30x ?4x 28x The copy filmed hare has baan raproducad thanks to tha ganarosity of: D.B. Weldon Library University of Western Ontario L'axemplaira film^ fut reproduit grace A la gAn^rosit^ da: D.B. Weldon Library University of Western Ontario Tha images appearing heira are tha best quality possible considering the condition and legibility of tha original copy and in keeping with the filming contract specification*. Las images suivantes ont iti reproduites avec le plus grand soin, compte tenu de la condition et de la nettetA de I'exemplaire filmA, et en conformity avac las conditions du contrat de filmage. Original copies in printed paper covers ar» filmed beginning with the front cover and ending on the last page with a printed or illustrated imprea- sion, or the back cover when appropriate. All other original copies are filmed beginning on tha first page with a printed or illustrated impres- sion, and ending on the last page with a printed or illustrated impression. Les exemplaires orio' lux dont la couverture en papier est imprim^e iont film^s en commenpant par le premier plat et en termtnant soit par la derni^re page qui comporte une empreinte d'impression ou d'illustration. soit par le second plat, salon le cas. Tous les autres exemplaires originaux sont film^s en commenpant par la premiere page qui comporte une empreinte d'impression ou d'illustration at an terminant par la derniAre page qui comporte una telle empreinte. The last recorded frame on each microfiche shall contain the symbol — ^ (meaning "CON- TINUED "I, or the symbol V (meaning "END"), whichever applies. Un des symboles suivants appara?tra sur la derni(kre image de cheque microfiche, selon le cas: le symbole -^^ signifie "A SUIVRE", le symbole V signifie "FIN". Maps, plates, charts, etc.. may be filmed at different reduction ratios. Those too large to be entirely included in one exposure are filmed beginning in tho upper left hand corner, left to right and top to bottom, as many frames as required. The following diagrams illustrate the method: Les cartes, planches, tableaux, etc.. peuvent etre filmAs A des taux de reduction diff^rents. Lorsque le document est trop grand pour etre reproduit en un seul cliche, il est film^ i partir de tangle supArieur gauche, de gauche A droite. et de haut en bas. en prenant le nombre d'images n^csssaire. Les diagrammes suivants illustrent la mAthode. 1 2 3 1 2 3 4 5 6 P0303 /4 DEPARTMENT OF THE INTERIOR CANADA Hon. W. .1. RCKHJ. MmiBlcr. W. W. CoBV, CMC Depuly MmMcr. PUBLICATIONS Dominion Observatory OTTAWA W. K. Kino, C.M.G., I.L.D.. Director. Vol. Ill, No. 3 The Spectroscopic Orbit of 12 Lacertae ii f liJ Hi: — • BT RKYNOLD K. YOING, Ph. D. OTTAWA GoVliRNMBNT PmNTINQ HURIAIJ 1915 I v. SR(U2— 1 'I'lii'; sn:("ri!()S(()i'ic ouiur (»i- il> i..\( i;imm:. liY Iii:VMII.I) K. VdlVC, I'l. I). 11 t 1 The liinan- clianiclrr of !_' l.arci-iu' (a = 22'' '.W'-i). ,5 = +:)<)^ 1(1', iiiai;. .")■.">, typo IVJi \va> aiiiK.uiirnl hy Ailaiiis in the .\-tr(ii)li,\-~ii-al .luurnal in l'.)12. The ciiaractrr of tiic s])(Tirinii may iir iu-knl from Talilc I. wiiich iiivcs the \\a\c-lcni;tli< of ijic line- u-i-i. In adililion to ilic wa-.c-lcn^llis there iiixcn, helium lino at \ ll'.Ki:;- S7.'), X lOtlU 117, the lines ,\ lOMi. ,\ KKII, X 1072 ai'e aNo i)fe-.cnt. None of tlie>e lattei' line~ were inclinieil in the liiial fe(hietion>. r\iii.i: I. Wavr-Ix'Tigtlj. -IIOI VK) ■m:i«-.>s 4267 301 Wavc-Lcndtli. Element . i:it()(;:!t // ■l:iss. KKi lie tlTM.rtl II, 11->1 1(10 Mg ■l.-|.->J-7.-)(l Si 4:>i)7!)r>n Si The olwervntions, mimlieritii; 117. are 'j.\\ru in Talile HI. When th writer heiian woi'k on .aceita' in I'.M 1, o\-er liiiy >pertro^ram-: ha t already Keen olitaineil and a- thi- niimhei' ii-uall\- -iillices to delei'inine th • irliit of a hinarw the >tar as renio\-cd fi'o!n ilic oli-ei'\inLi proiirannne until -uch time as tlio~i' plate- already on liand -hould he reduei'd. Wh this work was completed it wa< loo late in th and while l!ie Itti:; and I'.ll I \rloeitie- indi-ated ;, sli to hartiioni/e the re-ult- failed, mi lh:it it sea-on to i;('t more plat( that a I'lin of e\posUt >r' period, all efforts it was not until the tall of I'.H.") e- ininle iluriim 'he eour-e of one niiiilt -howed the I rue nenoij he mdlMihial oi ,~ir\ at iom~ do not lit anv (au've well. Tl Us and al-o th.e fact that tl le pi'noil i- \ery slioi-i m.ake the del ci-muial ion of ''i'' numiier of cycle- pei'formed lietWeen -ucce"i\e -ea-oii- dillicult and hiile uncertain. Ueiwcen the lir-t and l.i-t plate the -tar ha< tra\ell( iic.uK eiiiht thoii-and rexolutii 11^, -o Mi;it li no mi -Lake has I IS iieen maile m I lie w hole numlier of ( \cle-. il le period -iiould he aceiiiate to within a second of time. < »li-er\ ation- -eciired at other ol>-er\at llorie . coxerillLS tlie "' I'^ll'' "i' 'he -ame epoch ,a- I ho-e ohtaitied hi're, wnuld prohahly •Mimnate aii,\ uiiceriamt\- in this regard. Hi I' SStil'J— 1 ', 66 THLKAI KINS OK IIIK 1)1 > MINION OBSKUVAIOUY. TA!U.!. II 101 \ Ami: McilN I W llMiN cill>ri;\ A Diiio. noNS OK 12 I,.\CKUT.t. .lullan Pny •j,n',t,'jri.- V ■Incity I'llilHC. il'S + 3 •046 ■'.Kl'.l + •■> (V.'O Till - H ISl si.') -43 •100 ■| Mill. 111. '> •04S -lO^K 3 ■ iir> + 3^!t •» • itw + io^:. •J •(f.m - 0-s ■ 1 •070 + r.-x •> (XiS +2on ■> •{«»" + itv.'- ■> ■ 07.; + 4-r •J 074 -24 t THE SI'K(ri!(IS< (il'K (Umn hK 12 1,\< Klil'.K. 67 TAiii.i: 111 OTTAWA (ihsi:h\ \ iiiiNs or !_' I a(t;iit.i".. -(■„„/,„,„,/. Plat.'. (Jhscrvcr* Date. .lultaji l)a\ \'l-li)i-jly WiMnht. I'liasc. OC. Urlliark-. 1914 019S 1" July 17 . 2,120.:i3IM() - i 1 1; 3 -047 - 33 U210 II .lulv 21 :;:;."> 771 - .'. 1 1 149 -10 5 G220 II .l.ily 23 .... 337 (i7.'p -.;(). '.1 -J ■ 129 -12 022a 1" .lulv 21 , 33s ■ 7ns '. — 25 2 :; -074 - 10 022:i 1" .lulv 21 33.S-7NS -25 3 074 Hi'MM-a>ni-c 6228 (' .lulv 27 311' S2S l-^\pn.-M il l;i5 [lilll 0233 I'- .lulv 29 313 s P.I -20-3 ■J 114 + 90 (5230 ll .July 31) :ill (-,31 - 20 2 3 •127 + 4^8 0244 i"(: .\un. 3 3IV.73S ! ho-s 3 -170 + IS 0202 11 Xntc. 4 3 P.I .si;2 -31-s 3 -142 -14 0200 l"'V ■\UK. .') 3.">il 727 1 20-1 -Oil -12-5 0270 11 Aufe. 11 3.'')ti'7tl2 --2I-7 _> -0!I0 + 7-8 0270 I- .\U)!. It il.'i'.i 7ss 1 - .'» ■ '1 _i 027 - 4-5 02M V 11 ■ U^. IS , :;i;3-73ii -27-0 -1 113 + 2-5 02M> f Auk. 19 .■;oi 7.">7 -l!i-r. ■J ll.'.l -15-0 K|""li i-arlicr'.' 02(11 c Aup. 21 300 I'l.'il 1 131 -10 5 03(IH 11 Au^. 2.") 3711 722 - 1 1 ;; lis 0-0 0314 (1 -(• ■ \UK. 20 371 713 - 03 -J -on - 9-5 03 IS 11 .Vuj;. 27 372-012 -21. 1 -100 + 9-5 Kxpiiscil 1 II niin 032S (' .\im. 31 370 7117 - 7-3 ■J III! -10 II 033r) 11 ."ic'pt. 1 3s(i i;i;."i -111 s J -O."i0 - (is 0342 11 .-i.'pt. s 3S.1., -,.-,.-, -21 '.1 -J 1)7!) + 4-3 034'J V Si'pt. 9 3.S.5.0ti!) + 12-0 J -o:M + 1S-0 0349 V Sept. ',( 3s."i-00!t T 9-2 ■034 i-i4-s Itciiica.surf, 03.")0 1' 11 Si'pi. II 3.S7 714 -15-7 3 ■MS - 10 030!) 1" Sept it 390-050 - 13 .3 ■(KtO - 4 2 0409 > .">cpl . 20 390-037 - 7-1 ■• -IS!) - !l-0 0409 V ^I'pt. 20 39(i-037 — .5 - .5 -i.yi - 71 licnica.-^urc. 0426 I" .•^i'l)t . 2.") 101 0.55 + 1-0 ■_i ■1S7 00 0439 I" Si'pt. ■Js 101 1)55 -25..S 1 -0!l7 -t- 4-s 0454 II Oct 1 407 -.59s + 4-0 2 111 + 20 11 0479 Y Oct. 4 410-032 -30 1 3 (IS'.I - 10 0479 V Oct. 4 410 Ii04 -33 1 ;{ -O.v.) - 4-0 H^Ill^■:l^uI■c. 0497 V Oct. 13 41!) (i04 + 3 3 3 ■17S + 3-7 0.-)04 1" Oct. 14 420 t)13 + 7-0 3 -1)29 + 9-0 (i.">12 c Oct. 21 427- 009 -30 4 3 -074 - 0-0 0.->21 11 Oct 22 42S-095 + 1-4 3 (K)l — 1 -S 0r)31 (i 0.-t. 24 430-49S -19-9 3 ■104 + 11-0 r.:.42 1" Nuv. >i 439 -(120 -24-3 3 113 - 5-5 0.'i."i7 1" Nov. 10 453-ta)S + 12-7 3 ■000 + 95 O.")")!) \ \iiv. 17 191.5 454-591 + 4-2 2 •023 + 40 0992 ^' Mav 13 031 ■S5S -10-7 '2 ■035 — 5-5 099.S (• \lav 11 032-H52 -13-9 2 ■0<13 + 10 7001 ^' May 1.'. 033-H47 -27-9 3 •093 + 2 7020 \ May -1 045-849 -23-8 3 ■ 123 + 2 5 7023 '■ 1 Mav 2S 610 846 + 1-3 3 ■155 + 120 7020 I'M M:.;- 29 047-S39 -lis •> ■1S2 -12s lid V: 68 FLBLICAIIONS Ul illt UUMIMU.N UB^OiV.U i '1;\ . I Ai'.i.r 111- OTTAWA Uli.-^l-IU A 1 lUNS OV IJ LACKKl .+.— fu/ifdiJiii. I'laU". OljuiTVer* Uati'. 7(i:i:5 704 ;i 7040 7172 7170 7177 7178 71M) 7IH1 71SJ 7is;i 7 LSI 71S.') 7JI)I) 7.;i)i 72l(:i 7JU4 71107 7-.'0S 7J»'.t 7210 7211 7211 721.') 722!» 72^1 72:iiJ 7240 7241 7242 7243 7244 724U 7250 7251 7252 7250 7201) 720S 7270 72!i;( 72'.Ki 7:iO S.pt. 2<.l iSi-pt. 211 Julian 0;ty. \ iloiny. Weight. I'liaso. jScpt. ;«t, |S,.pt. M >,420.04HS40 050- 812 051 Sij 7U0 ■ 75il 7:iOSUO 7;i7-5as 7;57-5S2 7;l7-077 7;i7-722 7;t7Ss52 7;>7 • S75 7;iS-5:il 7;!S 000 714 515 711-5',i;i 741 012 711 (174 711-717 714M2 741 SS'.I 745-52S 715-700 715-751 7 15 -.s 10 715 -SMI 751 -.500 751 -0,5s 755-515 755 5S7 7.55 -02S 7.55 072 7.55-712 755-750 7.-|0-5'.HJ 7.50 042 7.50-0(10 7.50-7r.O 7.57-011 700-510 700 111 1 700-71:1 7i\'.l .5'.IU 70!l (I'.IO 770 .5.50 770 007 770 7.57 771-021 771-721 -+ 8-0 -14-5 -2:t -ly-y - 3-0 -35-2 -140 — 7-7 -23 + 2 — 5 -32 1-0 + 3-5 -23-8 -lS-7 - 0-8 -10-3 -32-3 -10-5 -I + 11 -38 -20 - 2 -30-U -19-1 + 181 - 8-2 -34-0 -44 1 -21-1 - 5-2 -30-3 -37-5 - 7-0 -41-0 -24-2 - 3-8 -20-5 -24-3 - 2 -18-5 - --r. -20-5 + 8-2 -42-0 1 1 1 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ■J 3 3 1 •031 -000 123 -082 -020 ■Oilo -141 on -O.SO -003 -045 - 125 (Kll o-c. -000 •054 ■087 ■ 100 (Mil -108 -108 1-17 -005 -100 -H3 -030 121 - 145 •187 -034 -078 -118 •157 •000 •043 •083 131 + 110 - 3-5 + 2-7 -22-5 - 30 - 5 + 3-8 0-0 + 5-0 - 1-0 + 4-4 - 0-0 -10-0 li.-MIUlks. Slit M-t uiilc 3 -117 3 -005 3 I'.H) 3 -000 3 - 103 3 -010 3 •o;-5 3 -013 3 ■ 103 3 •002 3 • 102 (10 - y-0 + 10-0 + 7-0 + 2-5 - 1-7 - 0-0 00 + 8-0 - 7 4 -12-0 - 0-5 - 3-7 - 3-0 + 10-0 - 4 - 8 -10-0 -11 - 8-2 -21-0 -10 + 15-0 -12-0 + 0-0 - + 4-2 + 0-8 - 00 + 12-0 -10-0 + 4-5 + 5-0 -11-8 r.iMMii vi'i i-('i-';uii- = Ptank«lt; (:'r.annon; IHIIarp«; P'-P«rker; V^Youn*; G-^Uibnni P"-H. H. Plaikett. THE SPECTROSCOPIC o.".BlT OK 12 LACEUT/j; O'J MJ.ASLHE,S OF 12 LACEKT.i; X 5ti2;i 5030 5(134 5042 5047 5004 50ri5 Vcl. \Vt Vcl. Wt \".4, Wt. V,l. \Vl Vel. Wt. Vcl. Wt. Vel. Wt, 39:i3-727 -35 -7 i -27-4 -loo - 30 -S t -23 4 -2'.t0 -22>. - 7 « 3 1 -191 i 402ti:io2 -34-r,; i -55 31 J 1 -54 3: ■ -41 ■« i -54.4 i -28. ll i tlOl-SW) ■411;) i»2S -15 S| \ - 7 -17-2 - 4 s -105 i I -13-8 -21- 1 -20 8 -31 1 - 27 • -21-3 2 i 3 1 i I a -20 7! i 42ii7 ■:!()! 4:ilo ii:)i 4:iSSl(K) 4471 (i7('i 4552 w.W -271 -35-,S -33 5 -15 2 -33-3 1 2 i 2 i -51-5 -23 -40-5 -28 I 1 i -40-6 -50 -42 3 ! 4507 ■ U50 a 1 1 \\ei|?liti'(l nie;m \„ C'lirv. -42- 07 + 10 51 W) - 2S - 2.S ■ so + 1S.4S (1 IM) - 2,s -22 (13 + 17-7S + 1)3 - ((■2.S 1 + + 1 c c; r. i^ -23 87 + 14-8y - 07 - 28 -33-,s2 + 5 ill - 05 - 0-2S -40M) + 5. 00 - 018 - 0-28 Itadial Velocity -23-7 -10 G - 5 1 + 18 - y-3 -28-2 -42 1 I lid S:3 •M 4101 4U:) ^i^>> 4JtjT :iol 4;i4ii r.Hi l.;ss liHl 4171 •■Ti' fJI ■ - IT :i 1 -UiTi 5 -I4:t 1 ■> 1 .■> i 1 - ^-.S' i -Jl '.t I t - 4tl( . -:i't 1 I ~ni 1 ;;;; i \ - S-H + lt>tll -•JO -Si w. ,tiii.-a Mu-rtli V. V,i Ciirv !• ■ . 1 1 , > - J :(."r.' + - 3 _ > - 4 ■1 + 3-4 -t-27 1 +2S-il +32 -H + I'.» 7 +2t>.3 t .iJ 11 • :iil (1 a i J s ! 1 + 3H J — S .'i 1 - 1 1 7 1 -19 - n -12 — ''7 -l.-| -13 .s li s II ,s 7) ■1 . . . 1 ; U 1 -1 11 1) + 10S + 24-0 + 23S -il3 !1 + ir,-7 +37) -4 2 7 ! 1 mil siMl -S.i — 7) -11 -12 -37i -11 -17 I ; II ;. II ;. '■' J t i tll.i !t2s 42(17-31)1 i:;iii-ii;;i - I> - 3 4 -34 7 -11-3 -10!» -14 2 -150 -10-7 -27-8 -18-7 J I \ 1 3 i l:iss. UNI 4171 r,7i> 17)52 ^."lO -17 )1 11 I 3 \ 1 \\rl|;l,l,.(i liK all \ . \'. ( 'urv. ■ 1 M - :i .'7 i II iij - II 2s ■ J"j 'III - :i 'I'l - II ii:i - 11 .'s 111 n - II 17 III i:, '1.-. 11 ii.i - II JS III IKI II II.; 11 _'s - 17 :il - 11 02 - (1 2s t IS IS - i:i 11 - (11(1 - js Kiull:il V.liinly - St 1 .'lii - 1.'. -'2 II - - J 1 - 2.V2 + 4 4 i ^4 iJJ;: '•• asei. nm, KAIIHNS nl- IHi; JXiMINllIN OHSKUV \ IdHV. Ml \>i HIS (M U I.Ai 1 Kl 1. (V,„(i„i»./. . I'l :,'i , I'l 11. . 11 i:; ■ II l li 1 -:!1 II -till -mi t . 1 -mil -2:m - ir. :t7 :i — ;l.'i II 1 1 1 -17 II -14-4 ;''Ti' •i i 117 1 ii7ri - t(to J -Ijs i -17:i i Il)i':llt \ . Ciirv. - Jl i:. r IS :,.; r II 117 - 11 -N - 19 («) f ISL'O ► 111 II .'S - v: w • |s INI ' J^ - i:', 111, • IS IKI • 11 n.; — 11 Js ■Hi '17 • 17 III 11 us II Js - ;;i'. IIS • lii s| . 11 Jll - 11 Js - 1 1 ss + ir. (in • II 117 - (1 JS Vi-liinly - ,i 1 - ;tii (1 — 'J."> ■ J - ■.'."> :i - JO :i - JO J + 0-8 * it(!iH';i-nrt' iiJ;: 88612- I'rm.u'ArioNs ok iiik udmimon oisskuvatouy. MKA.SIUKS Ul 12 LACl.RT.L Coulu \ (VJIVJ r.jc.ri (i27(l 11270 li^KI ti2.St) IVJ',11 V.I. \Vt. Vol \\t. \v\. \\1 \rl. \\i \r\ \M. \v\. Wl. ■Mr.n 727 -JO « 1 -27 r, J -1S7 . - :i7 11 ; -■.'1 :i 1 3 ■.VMM ■ S7."> -43-4 i i .. .. \ . - .-.> 1 : -til fi 1 J 1 \ -jr.o; ;. -M-8 4ii:t'."is -34fi 4 -4s.i^ 5 -30-2 5 4Jli7 Mil i:; -- 4 -41 2 J 4:U0 ii:u -4H.4 1 J -*j3n :, .".1 7 ; -41 7 CtSSlIK) -tUl -4.>-s' i -isy i -■-'111 ;: - :i;) i -2f)-S i -52 S 1171 liTil - .".4 ."i 1 -:iu-7' i -■J9-7 5 -1H« ! -.Mil 1 -27-2 1 -3S-4 llsl ('III -;t2-4 1 \V,.|l!hl..l nii':iU - 17 11.". ~ :i.'. :iii - :i.". :i7 17 -J i i N 7 "' :;ii '111 i;; 1.7 V. ^- l.')ti() + l.'i 11) + i:i "J . i:i III ,- 11 'Hi . IMi.". . 1117 V( - (IIJ - 07 (1 IHI n ii'i 11 III 11 iij • II ij Curv, - (1 Js - -.'S - (1 js - (1 J^ - 11 J-- - II JS - 11 2S lUdlnl VritH'lty - :il ^ - Jll 1 - Jl 7 .-, :i ■J7 II I'l f. - :i-' 7 THE Sl'ECTUUSLOPK (ihlJIT OF 12 LACERT^. 75 MEASURES OF 12 h.\Ci:RT.K~l'„„li„„„l. \ O.'iOs il:;ii IliilS li.lJS ii:i:!"i I'.ilJ ti:i4<) 1 1 Vii. ! wi Vci, : \vi \.l. \\l 1 V,l, \Vt 1 \il. \\I \vi, ;\vt. :i!i:).i-7J7 i -■-'(!■ li 1 1 -IS 7 ", -1.' 1 i -IS-;) J ;'.'.Mils7."i -2.Vt i - itu' ; -:is-,-, ; i().'ii;i.vj -i:i:i 5 -\2\ -iir, i I ~;i7:i 5 -22 J 11(11 S'.K) -■-•(12 4-17-3 -10 -5 5 U1:mi-.>s -lW-2 ■ + 120 i IJI17 :ini -22 -.i i -31'.( * -:).'i(i J i:uiiii.{i -I'.ll -Hi 9 i -2>r, 1 -2.^-!l, i -2S-2i 1 + i;i"i' i liiSHICH) -i.-r ; -i7-:,i |. -2ii.s ; - iii-.'i ■-Mr, ! — 1 •'* ' 4 171 07(1 "■" 1 '' '''■■'1 ' -.. ij : -iiji 1 J -.4.7 J -21 ' -1. i \\rl^lll,,i mean - -•:(.- 11 - 1.-. IS • :!0 III - 1 1 7i. - Ji. HI - Jl'r !H -t- s l)> \ „ \t s.i '1 :.ii • '1 17 7 Mi • li ,M • ."i IS ■ 1 so \ J II IHI II II.: ■ 1'. 11 IIS It O.'i -T ll is on:; Ciirv (1 J^ 1) JN (1 Js II _'s II Js II Js -- l)-2S lia.llai ViKuily - llO - llo - 21 1 - 7:i I'l s - 21 + 12 6 lid •I m5p 76 ri HI.lCATKiNS (IK rHK DOMlMdN OBSK.IU \ I ( HiY. MKASl HKS OK 12 l.Al'KUT.t— Cmidnued. X i;:U',c \.l, \\l I'.:!.'!') i;:i(;',i iiiii'.i 1. 11 III' iii.'ii (i43'.) V.-l. \Vt. V,l. \Vt. V.-l. \Vt. V.l. \Vl. v.-l. \\t Vi-l. \Vt. :w:t:i 7J7 :i'.»ii >7:i 4()ji) ■:>.■.-' 41(11 -^'.Hl 4 14:!- '.UN 4Jii7:!(ll 4:i4(l li.H Ciss 1(K) 1 171 i.Ti. l.'i.'ij 7. '.11 -11 •; ;. 11 ( 1 \ • 1 1 1 i t17;i i ^iJ 4 ; - 4 () ; - -'li II ■ - S-4 5 -I'.ir, i j , , . . '. .. 1, -32-71 i -11 ^ ; + 1-2 i • 'J ; - I'j i 00 1 -i7'rii !. - 9-2 S -24-3 J - 1-3 + 13 1.1 1 " - 9-r,| i - >-r,\ 1 -lull 1 ~ .vs; ; - 3-7 5 - 4 3 - 2 - '.to - .">■(> - 4(1 1 1 I ; - 3-.-. i -Kic, ;, + 7-3 ! -12 4 ; - J.l 1 -17-7 -2S1 1 i 1 i + 01 I 1 -l'.l-t> \Viii:l,i..l \ , Cirv I 1.:. 1 Ml II It.l n Js - I'l l:; 1 117 n iir< I O'l ■ ,; 111 II nj 11 Js — 7 '17 11 S-, 11 iij II JN li 07 II s,-, (1 ilj II Jv - 11 M',1 - (1 IIJ 11 JS - J.i 12 - J 1 IS - II (13 - II JS H;,.|>:.l \,|.Mll> - ^1 J - 1.". 7 - 1 ;i - 7 1 . 1 c, - 2."i 8 IIIK Sl'K<-rH()S< Ol'lr olililT OK 1:2 LACKin.K 77 MiCAsi i!i;s (II ij i,A(i;ur.u— r„;,(i„iiM(. X l.l.'il i;i7'.i c.l7'.l' iil'.i7 ii.")lll 1 ■..•,! J ti.-.Jl \.l \\l \.i \\i \,1 Ul 1 \.l. Wl. \A. \\l V,l, Wt, V,l, Wt. 31133 7.'7 + •> '■, -Jiij I -J70I i . 1 . . . . + S-7 + 1J-3 +25 1 3111) ls7r, ' +JI) s T J '.1 + 10 + 7 it II II ^ MS rJ.'> 3 t 1 4ll.'il-3.'i.' HIM' VIII 1113 ', US tjr.7 301 + 130 + I'.l + '.)■:, + 7-s tii; -' f 1 -2 ■J i i -lii 1 ;, — Jll s \ -31 7 ; + 7s r-Jll-7 + JJ1 + 117 + 13 .■) -t-13 3 t-ni 11 -lC-5 -Jl J -111 1 -J.') ■11 -Jil (1 \ 1 + 4-3 + 3-H + 10 S r 111 !l <- 7 + 11 S J i 431iM13t l:;^^ imi 1171 ii7ii i:,,"!.' 7.MI -■J3.rj .! --•'.11 ; -31 li ; 1 t IIICMll \,i Ciirv. - 3 111 II III - 1 1 Js - j.'i ."11 I 3|-. II nj II _'S - JS-,"iS - 1 ji; II OJ 1 1 JS - J,:i 1 • 1 1 ll'i - 7 Hi - II IIJ - II JS I i.'i n; - 7 s| - 113 - (1 JS I'.l ss - Ill I'l - II 117 - Js . IJ III - ID ."i.". - II IS - II JS V.l..,-ily t 1 II - .Ill 1 . :;■ 3 7 II 311 1 r 1-4 •Reinearturo. I, i '^ 78 PUBLICATIONS OK TIIK DOMINION OBSEUVATOUV. MKASIKKS UK IJ L.\CERT.-E— Conlinufd. r,.-:ii ti.-,t_' (;:i.")7 (■i.j:,! ; -m-o 1 4 ir.'i (i:r, ,'i ( ■> - 1 1 '1 ' ■ Js ll \ - :;vi. ; -:i7 !i -:io-:! ; -51-4 3 - ll-;i 1 . : ." (1 \ ■ '• -"' i ' \V,ii:l,i.,l iiitMri - V ,-,(1 - Ill '.'7 • ;;ii 117 • jj :;.; - J7IIS - :;ii ,-.1 - U s_' \ . II 1 1 - i:; (..', 17 .'.:; 17 7;! ■ m .".II • 111 7:; .- Ill '.1.') \. II 11 II 1.-, - II r.' . ii-i'i • II jii t- II JII < 'iirv. — I) JS II JS 11 .js - 11 2s - 11 2S - 2.S - U ■ JS Hudial Vt'lt)i'iJy - I',l-'l - -M-:; • IJ 7 t A 2 - 10-7 - i:i '1 - ■J7 11 THE SPECTROSCOPIC UKBIT OF 12 LACERT.5 79 MEASIUKS OF \> I.ACEliT.i;- ;)!«.) -727 .i'.Ri t \7.') llMlii.')J tlUl-.s'.MI 4H;i!»L',S 4-'ii7:il)l i:il()(i;i4 1171 1170 IISIKK) t.M.>.730 MVigl,(,.,i irtran \d < 'urv. Itii.liul Viluclty 7()i;n Vi-l. Ut -:ii)Cj| -17!li -:i7.il -:i7.:i! -■'ilMj - lli 27 + l'J-47 t (M8 - U-2S -•3 8 70'.';i Wl, \\t -10 li^ -13 0, -14.,s! -17->i - l.,l[ -JS.lj - 7{}' -.'1 - 17^4 + I'J ■■.>.') + O-IS - OJS 7l)J0 \'.-l. I W I -33U -33() -47-3 -30-fi -44. 1 --'7 -1-* s -30-3 I -Ji^oi - 31 13 t- 111 -40 + 1>S - O'JS - US 7U33 -Coritttiufd. 7043 \-.-i. U, -■-'0 ■J - s 2 - 3 4 - 3 7 -23 - y + -10 2 - II) Ml + 10 ■.■.3 + OlS - 0-2S 8 7040 Vcl. i \Vt \'fl. I \\: -31.2, -30. 4: - 4."i -41.5 - 34 is -I- 10 7s -I- 20 - 0.2.S 7172 Wl, \Vt -43. 3 -3S.3 -4S.y - 13.. -,0 + I'J. 92 + 012 - . 2S 23 -694 J 3;". .si i -r>2.9 -000 -74 9 -53-7 - .'.0 ()1 + O-.W - 21 - 28 49 9 lid 5:5 I' so I'lBLKATKlNh Ut lllE DOM IMilN OBr-KHVAliiUV, MEASIRKS OK 12 LXChRT.r— Continued. Vtl. 39t'>* ST.') 40-21) li.VJ 4Uil ^'.'11 Mti '■'- :iill );ilii I'l-l 4171 li.ii 44H1 4(W ■."lO W.M^htHl Curv. U:icll;ll V,l V,l -111 > - 4."i - 41 I'l II J.' - 11 JS .!(i;v 11 I. ■ I'l '^ -i;) II -ji II -iJi -^11 ii'isa n^i Vcl. \Vt -;i.".-t> -•is- 71 -It '.I - (17 J^ iiiiil - (1 JN - 7-7 - 23-S Vil. \\t - 4-S - 0-4; :\>i \.-i - tr4.') + 2-3 \Vt. 4 4 5 JO-U :s(i-H -■j:i-0 - 1 14 30 + y •Jl - •20 ~~ ■28 5 THE Sl'EClKUSlUl'R- UHBIT OF 12 LACEUTiE. 81 MEASURES OF 12 LACF.nrAL—<;,„l,nm,i. 393:i ■ 7J7 li'.tOt sT,") 4(l.'il :i.VJ 4101 N'.MI 4M:ii).',S 4J(i7 liOl 4:iiii'i;:u 4:issi()() 4171l)7ii 4n:ij 7.')!) nsi Vol W t 7JII1 \V,isl,i,..l linaM \ 1 Vj Curv. li^iilul 41 s \ 41-7 :i:{s 44 c, \,l \Vl - 41 so + S-'JS + " 'I ;!j',i \vi. : wt -l-'-4[ ■ 7u' - '.t 71) 10 - 1 :> :, - i)\' - r,--'\ + lL'.lt -IJ :. -10 1 + 4-:il 3 3:) 1.-, Ojs, + 3. \','l. W t J03 \.i. ; Wt ;;3s -■-'ou -3111 -_'3(1 -30-3 -3i'!>: 211 '.1 3ll('> 37 () 20 3 12.s: i 17-3 1 - 23-8 !0-5!l - 2.-, -37 li 11(1 + ti!l7i 10 4- 0-03 1 1 2N - 0-2S IS -7 7201 v,-i. ; \vi. v,r — .»■;>, + 2-4i -10 () - 3:,: - <..3' - 'J ■2; ;i3 0()7 ((■2S 0-8 Wt. -31-2 -1", SI -11-3 -2'J-2 -21iO 5 r O'.K) - O 111 - 2S 10 3 lid f I" ( - 82 I'lin.KATIONS II K THK IMiMlM'lS onsKKVATOi Ml'ASl in.s ni 1-' i,.\<'ri!'r.!'-"f'""'i""" ', - 4b 1 1 + ■-;■■■ i i 4 4-: i - 11 1 i - 1--1 t 1 + 11) 1 'I i ^ 111' 7 .'11 V,l, V.l. \\t 4 1 + 15.5! 1 + Htllj -:tJi -;w 4 •25 <) -59 5 -5:i ^ -47 (1 .- l»J Il i;n — 11 it's - ■js - 44 as V,l. \Vl + 11-3 3S-3 -JIO -40S» Vfl. \Vt. :i;Mi - i;'j-4 110, J :i-4 - y-3 - 7-2 -KM + 4-50 f 015 illh ^l•h( IKii.-l iil'K ulUUl (IK Ij LACLUT.K. Ho Ml.A.si lii:s C)l i2 LAChiiWi-:— Continued. \ 7.':i 72:i'.i 7J1(I 7J1 7JIJ 72 1:'. 7211 Vel. \\L Vrl. \\1, \il. \\l Vcl. \Vt. Vol, \\l V,I \Vi \V1. \\t. m:v.iTi7 lis! ; 11 ii| • -111 7; 1 -III-.-, 1 -13!l~ i ~ 2N • 2 4()ji> ."ir.j --'()• 7 i -2fiO -22 -6 S 1 a + 1-7 + 22 + .■.■3 rill I r ~'t ■ ■> + 1 ■>■.-) -13(» -20-3 -Kid - 12 -I'J 2 + 13 + J-2 - -21-2 - Ills -.")(! 11 :. i -30-3 -23. 5 -13 1 4:U() ():!4 Ciss-KH) 1171 liTi) 4,"i.'<.' 7:iO -1!M -.'IMi -2S--) 1 2 I 1 • 45t)7 ■■).">() * WV.Klllr.l IIM'iill \ ■ < 'iirv. - (I. - Jll -.1 l."j Js - JJ In T- :! 1 1 f 1) IN - 0-2N |.-| HI T :i l:; + II 12 - U-2S - 11 i:'. •' 3 11 r II 07 - (•■JS - 37- -T 3^ (1 - (1- i.". I'.l III Js - Ill im + 3 OS - 0(17 - 2S 1 1 + 1 I{:m1i:i1 Velnoity - 30-9 - 10 1 4- I>il — [•> • 2 - 3! r. - 11 1 - 21 1 ill.': v '^:: ;!^' S4 IH BI.ICATH'NS OK TIIK poMINKlN (lUSKHVATOKY. Mi;A-n;lS (H U \.\tVM'\.V. -Cn^flnmul. TJl'i :j:.I) :i',i:i:i 7 J. tJi.T .1111 1,111 1 tiil 4(71 c.;!! 44S1- lixi 4.V>-' 7:.o 4:iil7 'i.'.'' V, Curv. V,l Wi ■ 10 n • 1-' : - 17 > \(1, W 1 \,l w «■ -1". H 5 -;«) ii; ; -;i(M)' 1 -44 :i i j -■J'.l'.i; i -■J)0 i -;!7 0i 1 - ir. s 1 - rj s 1 -ru \ \ -;i!i II 1 -41$ III i -4;tisl J H.i.ii.il Vrloritv 11 I I I.I III ;i',i Ml J 1. 1 1 II II.! II JS ;«) ;i a- .1 \.i \\i -iii-oj i - 2--« ; \V1 \\1 II) 1 .■.17 n I \,.| . Wi -IS 7 -Jl 7 -M 7i (I Js Vrl. \VI. - (IS - 11 :i, - 1-4] - 'J (I - 7-0 - 47 - 5.6 - 3 3 - 41 I) ■J,-. IJ 1 f)t 1 :« . 1 ;>! II I'l II IIS - 11 Js - II Js Jl 3-8 THK .SPKCTK(I»?( T.iKt \VI \Vl 1 \.l ' W 1 V,.| \\1 V.l \\t \'.l, iUi V.I. \\! \VI. \Vl. ;i'.i.i:i 7J7 ;iiiiii sr.'i 4i..'ii :i5j 4101 SilO -ij 1 ; -:«i.4 5 -.::m! 1 - 10 1 ; --■11: ; -j:i:i, ; -:i7 ll 1 -17 1: 5 . . . i -!>> 7| i - -7 ■ 1 5 11 1 -:i> :!: i -1:. S: ; t -' li i - r.ti I ft - f. 1 -33 -i:i!i 17 1. -Ill -12 s -:il .-, -2!t-2 -20 H -22 3 + 3 !t 1 1 1 1 4 — .'. 1; • 7 s i I i 4l4:i(l.!s 4Jf.7 :joi — 7 • i i -32 - 8-5 - 23 -IH-7 - I'.l J -is:) 1 1 - -' 1 I •rl'is '. - 1-7! ! -i:!ti ; 1 -HOI ;, 1 12 7i ; -+ Ki (I' ! ■r2x-oj i + 14-2 J - 4..'i J 4:140 I>.i4 CisSKH) 4471 11711 j.-i.-i.' 7:io i:.ii7 ii.Mi h 11 -^IJ n - 1 ;i J i ) •1 WciRhlcd mi-an \J ( 'iirv. - 27 l:i f- 1 J',1 - (IS - II _'S - 'SJ OH 1 '.(, r (1 nil - .'s Jl :i 1 :<-, - 11 I-' .N - Hi iiii - 2 :i2 + 12 - JS - I'7',i - 2 :ii; - (b"| - JS - 23 (IS - 2 111 - 11 is - (1 JS ■ 11 111 • (11 - 2.S H,'!.li:,l Vclni'lly - :•(•, r, -' ' - IS .-, - 7 ,-. - 2ti .-1 + s- [ Hi.': 86 PIBLKATKINS OF THli UDMIMUX UBSEUVATOHY. :to:H 7J7 41(11 S'.M) llt:t '.us -r,l(ir,:il Ciss Kill 1171 ''7r, WVinhtfd nif.in \ . \ ■ Curv lUdnl Vrlocily MI.ASIHIS i>r IJ I.ACKRT.K— Cowfiiirffrf. 7:u:i \,1. \Vi -10- 1 — 55 ■ 5 -;t6-J -■Mo -34-9 -23!) -52t) i:i (I js \\'\. Wi v,.i, : Wi \,-l ! WI Vcl. i wt Vel. Wt. Vel. Wt. THE SPECTKOSCOPIC OKBIT OK 12 LACEKT.E. 87 The ubscrvatioii.s were frruuped into normal ])laces on the as.sumi)tion of a i)erio(l ■ llement.^ were estimated to be sufficiently close to serve as a basis for correction. P = Oiy;«),S(» day (■={){) T = .Julian Day 2.420.7r)l l.-){) A' = IT^OO km. y = -Wi-m km. ii f £:3 T IS 'akeii as tiie point where the radial v.'locity curve cuts the axis of velocity of the .-system while channinn rroiii negative to positive, i.e.. ut the instant tiie primary memlxT of tiie system is nearest the si'ii. This instant may con\ eiiiently !)«• desifriiated prnhftmii. 88 PUBLICATIONS OF THE DOMINION OBSEKVATOKY. The observation equations resulting from these initial elements are;- 3 . 4.. 5. 6 7 8 9 lU u. 12 + 1000 + -730 + 403 - 148 - -583 - 931 -1 000 - 837 - 36"! - 019 + -460 + WK) 014 •684 ■915 •989 ■ sri •306 + 1-5 ■+-4^7 + 10 + 10 +0-8 + 010 -0 3 - 540 +0 8 - 931 +2^:. -1 000 -15 - ^SSH - 136 +03 WIUTC = dK Tlu'.-^e ^ivc normal ('(piat 9-:5UU.r -O-S'.K)// +011'.)> +G-9S9 = l) + ,■)•! U.v +(IU")t)2 -()• 102 = + 4ir)7; +2-733 = X = -0-750 y = -()-()7S 2 = -0-G33 or (ty = — 0- km. ,IK = -0-08 km. ,/'/' = -0-0012 (lay The final elements heromc p = n-l'.):5()80 (lay 0-0 T = Julian Day 2.120.7(11-1488 + -001 A' = l(i-02 km. 1 0-50 ± 0-37 7 = 13- km. a 8!n I m^ sin^ i' 45.0(1(1 km. = -0001 O THE SPECTKOSfOPIC OKBIT OF 12 LACERl^E 89 No att('ini)t was made to (Ictcimiiio ('(•rontrioitv. The irsiduals wliieli the individua! uhscrvatioii Sivc wlicii n'i)i'cs('iitt'(l !)>• these elciiieiits are lahiihUed ill Table III. They were ohtaiiied iiraphically and thouffh ^iveii to a teiitli of a kil jiiieire are not in ficiierai so accurate! v (h'termin Til prohaliie error of a siiij^le ohserNatioii is .")S ie(l less iietHiies 1 l( tl un. Th lan olie-folirlh llie period hut, even so. the epoeli becomes uiicert phases were not reihicrd lo the -un which would aller the residuals a lillh tlioiigli not nuicii. Hi: ••.,■ *•.; There .seems to be a peculiar feature indicated by the measuros so far made, which may ^o a Ion;; way loward e.xiilaininjj; the lan!;e i)rol)ab]e I'rror. If a hifih velocity is obtained at i)o-itive maximum, the velocity at the followinji minimum is \ aries froni cvcle lo c\cl( \'ery low. and r/cr rtrsa: thai is ti le an jilitude In fif^iire 1 are plotted the results of -onie ijidividual nights observations. The velocities obtained on one night are desifjnated t • be a distinct teiideiicv fi alike, a lid il lere seems or the re:_iduals at maximum and miiiii luim to have opposite signs. It would be interesting (o take series of plates with an instrument winch would permit of a shoiler exposure, so that more plates coulil be obl.uned covering one revolution. Doiiiinif/ii Observatory, Ottawa, (»ciober. 101.'). it no inBl-ICATIONS OF THE DOMINinN OBSKHVATOHY. • Km. ,,n ® « » • \ ^ / • \ ^ \ « .^ / ^ \ ^^ o \ V ® o > \ «l o -K ® \ O . / 1 (!) ®\ c 1 . o / e O -30 4 9 • ® i®_ -*0 • 4 1 • • •3 Days ■1 TlUCHE I. Km. 0«yt 1 o 1 1 9^ r t r i ) 1 ' \ / \ / \ ■ — , '\ \^ 1 rN ii J 1 1 \ — — , / / V — -\ r \ 3 J — t'^— 2 J \ I l..rc irv < 1 IIM- 'iK IJ l,V..RT.K, THE SPECTROSCOPIC OUBIT OF 12 LACERT^. 91 Km. +70 «) 1 j ® O • 9 « +10 o 9 O 9 ®9 © 9 3 3 >N ® o o 9 * O o 9 O A r fan — i o y 9 V 1 ® -n \ 9 Cf ; y / o- O 9 \ [ \ '~ 1 »9 o / a 9 o -?.i __ ( 9 9 r 9 n •1 \ 1 9 ® 9 V 1 o 9 ' 9 \^ ® 9 -n ,^ • 0, / 9 ® ^ g9 9 -J (! 9 » o 9 D i -tr-T ® -4il ^ < 9 —9 9 '\ 9 ? 9 *6 -W) o * — i o 1 ' 1 i ! Days OlIst.UHTIONS OK 11; l,A(Klirt:. MiMin! U il-iii iilisiTvriliiins iin- rrpn-inlcil by two I'diiccnlnc iirrlrs. OiiHwii, I'.M:), •• ■■ •• l«n crtlps, ihoiTtKrc imp tillr