CIHM Microfiche Series (iVIonographs) ICMH Collection de microfiches (monographies) Canadian Institute for Historical Microreproductions / Institut canadien de microreprouuctions historiques f\f%f\ Technical and Bibliographic ^ jtes / Notes t.:c!iniqLes et fibliographiques The Institute has attempted to obtain the best original coDy available tor filming. Features of this copy which may be bibiiographically unique, which may alter any of the images in the reproduction, or which may significantly change the usual method of filming are checkeu uelow. □ a □ □ n a Coloured covers / Couverture de couleur I I Covers damaged / Couverture endommagee I I Covers restored and/or laminated / Couverture restauree et/ou peliiculee Cover title missing / Le titre de couverture rnanque I I Coloured maps / Cartes geographiques en couleur Coloured ink (i.e. other than blue or black) / Encre de couleur (i.e. autre que bleue ou noire) I I Coloured plates and/or illustrations / Planches et/ou illustrations en couleur Bound with other material / Relie avec d'autres documents Only edition available / Seule edition disponible Tight binding may cause shadows or distortion alcr, g interio' margin / La reliure serree peut causer ce I'ombre ou de la distorsion le long de la marge interieure. Blank leaves added during restorations may appear within the text. 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Coloured pages / Pages de couleur I I Pages damaged / Pages endommagees I I Pages restored and/or laminated / Pages restaurees et/ou pelliculees Pages discoloured, stained or foxed / Pages decolorees. tachetees ou piquees Pages detached / Pages detachees y Showthrough/ Transparence D n n Quality of print varies / Quality inegale de I'impression Includes supplementary matenui / Comprend du materiel supplementaire Pages wholly or partially obscured by errata slips, tissues, etc., have been refilmed to ensure the best possible image / Les pages totalement ou partiellement obscurcies par un feuillet d'errata, une pelure, etc , ont ete filmees a nouveau de fagon a obtenir la meilleure image possible. Opposing pages with varying colouration or discolourations are filmed tv.'ice to ensure the best possible image / Les pages s'opposant ayant des colorations variables ou des decolorations sont filmees deux fois afin d'obtenir la meilleure image possible. Additional comments / Commentaires supplementaires: Continuous pagination. Ce document est (ilme au taux de reduction indique ci-desscuE. lOx 14x 18x 22x 26x -^Ox i 12x 16x 20x 24x 28x 32x The copy filmed here has been reproduced thanks to the generosity of: tcolc polytechnique, Universite de Montreal, Bibl iotheque The images appearing here are the best quality possible considering the condition and legibility of the original copy and in keeping with the filming contract specifications. Original copies ir' printed paper covers are filmed beginning with the front cover and ending on the last page with a printed or illustrated impres- sion, or the back cover when appropriate. All other original copies are filmed beginning on the first page with a printed or illustrated impres- sion, and ending on the last page with a printed or illustrated impression. 1 he last recorded frame on each microfiche shall contain the symbol — »- {meaning "CON- TINUED"), 0' the symbol V (meaning "END"), whichever applies. 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 the upper left hand corner, left to right and top to bottom, as many frames as required. The following diagrams illustrate the method: L'exemplaire filmd fut reproduit grace d la g6n6rositd de: Ecole polytechnique, Universite de Montreal, Bibl iotheque Los images suivantes ont 6t6 reproduites avec le plus grand soin. compte tenu do la condition et de la nenot* de loxemplaire film*, et en conformity avec les conditions du contrat de filmage. Les exemplaires originaux dont la couverture en papier est imprimAo sont film6s en commencant par le premier plat ot on terminant soit par la dernidre page qui comporto uno omoreinte d'improssion ou d'illustration, soit par le second plat, selon le cas. Tous les autres exemplaires origmaux sont filmAs en commengant par la premidre page qui comporte une empreinte d'improssion ou d'illustration et en terminant par la derniAre page qui comporte une :ille empreinte. Un des symboles suivants apparaitra sur la derniire imago de cheque microfiche, selon le cas; lo symbole — ^ signifia "A SUIVRE", le symbole V signifie "FIN". 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 soul clich6, il est film6 A partir de Tangle supirieur gauche, de gauche ^ droite, et de haul en bas. en prenant le nombre d'images nicessaire. Les diagrammes suivants illustrent la mdthode. 1 2 3 1 2 3 4 5 6 MICROCOPY RESOIUTION TEST CHART ANSI onel ISO ItSI CHART No ? 1.0 'i: ^lil 12.5 131 UjH Hi 2.2 I.I IIIM mil 1.8 i-25 iU 1.6 ^ APPLIED ifvVIGE Inc ^^^:^^ v^. c'^V^-'^.^^sw? pt^^^' prnLicATioxs iJiiliir Aylroininin, vol. 22, ])ti^c 12. It is of i)hotop:rai)liic iiui^nitudo .')2 and type .\.") with the siioclra of botli (•oni]ioiu'nts showinfi;. ThirtN-four spcctrograins of tlio star iiavc boon .secured at Ottawa in li)lG and l!tl7 with ti:e -innli'-pri-ni spectrograpli, whose linear disi)ersion ;it \4;?2') is ,S21 A per niiUiiiietre, and from these (he orbits of both conipt iients have been deter- mined. The two >eis of iiu(-s do not differ jireatly in intensity, thouji;li the lines of what i^ herein called compont nt I are of slifrhtly better (piality for measurement than iho-e of component II. In freneral, ten or twelve lines were measured for each com|)on(>nt. The wave-leiifiths used in the reduction were those adajited for stars of about -iniilar tyi)e. and the elements of the orbit determined from the use of those wave-lengths were tjiven at the Albany meeting of the .\merican Astronomical Society. Since then, in preparinj; the woik for publication, it s( ned advisable to revis(> some of the wave-lengths used, as the aluebraic means of their residual veloci- ties were lai,u;er than slioidd be expected. When the wave-lengths arc so adju.st(Hl that the sum of tiuir r(>siduals is zero, no g.eat change may be looked for in the elements re-ultiiifi from th(> revised velocities, but these latter should have a some- what better ajireeinent with the final curve. In the jiresent instance the wave-lenj2;ths of the hydrojren lines, the manne-ium X41S1 and souio other ])rinci|)al lines were, when revised, .'ill jji'f'ater than Howland's or other tienerally acce])ted values, and it was decided to lower all values so ;is to ])r\u^ these jjarticnlar ones into conformity with the fr(>nerally accepted \alue-. Thi.: was equixalent to chan^nni^ the velocity of the syst(in by -FHS km. i)er sccdikI. This is the only dilference of any magni- tude, though a few minor chaiifies occiu- in the other elements i)rincii)ally through dropping all lines u~C(l less than li\e times. The data of the lines are given in the following table which sh,iws the wave-length as I'cvised, how many times the line was measured out of a possible total of ti;?, the total weight assigned to the line, and the residuals numerical and algebraic. The latter an- taken in the sense, mean velocity of plal<' minus line-velocity, and reh'r, of course, to the revised wave-lengths. 54047— 1 13G I'l iiiK \riuNs (II iiii: i)(i\ii\i(i\ (tiisiin \i(iin LINKS IN JO TT (\SSl(i|'i:i.K Wav.- I..ht.'tli l{rsi.lu:il i.'is:: 7r,(i N i:.7l' ■-'.-.T 10 ■i.-.i'.i7i:! 11 i."):!|.ii(iii s llSl.llll ."lO 111. van." r, 4401 •7MI II liill.'i (Mill 7 i:r,i !i77 21 l.ilOli;!! 47 i:ij.-, i;i:; i:! i:)o7 !i7l 17 1L'1«I-71.S li; l-.'lil i.M 10 12'iiiiiL'i; J."l i.'7i :.7:i 11 W 1 it.'.lii 1 Wavi'- 1 . .t 1 NullllTII'ul Alm-blaio I! 7-9 -01 •IJliO .V.MI ."l i:j-3 f(l 2 i2.".o:i."ii I'lj 10 S -Oil 42:tii (i:(2 li lO-O -0 a 42:!:!:i!ii ■>ja 11 .{ +0--, 4227 -21! 2' (It) i 1 (, I2l."i 7:i:i u 1(>'3 40 1 4202 KM ■|3 7li + 01 411Wli77 si 111 -0-."i 4l4:i 7.!1 ■joj 11-2 +0 :; 4101 VIS ••-J St! +o:j 4077 ■ 710 7 '. 10-3 + 10 4071 SI7 ~ 12« +i» 4(Mi.i(;(ii; 15 ft -2 + 1-2 404:i (III 111 12 • I 00 40O.-> 441 I7J •IS +0-4 39:1:! 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KiI'IImI \'flll|-|IV \rl. \\l. -im. I lU :i lOJ li Kl'l 7 11. -> 1 iJ'.i ;• ; i»s;!: i '.»:, ■ 1 lIKl 17 in.\.i l.'l s.':i I V.l \\!, .'.I I ^J '.I 7r, _• 1 1(12 L' 1)1 S!l () llll.-i sj:il Vrl \\l. ■ 107 I -i:i7-l i S4 ; •n-n •ini.o 1 ;;n - .11 ■-'■-• _' !ts I 2J '.<'< • III -r HI ■ J.s - JS SI ■ I .vj;i!i \ Vl W : 7'* 7) '1 1.1 (i.'i lid 1 S4 II + 77 s 71 71 •_>_. OK l.'l s2:i!i \\i -I'.'ii'-' I(l.s.7> 70 '.1 ii."|.0 S'.MO \\T + M'f. •.l:i■_• (IS 00 'JS (IS..-, 116 ri HiKAi klns (ir iiii; imi.mimox (iHsi,ii\ akiK'i .M1.\>1 l!I.S (i| .Ml TT lASSKiI'l. 1,1: l„urh„l,,l l.'.M i:.7J !:,1'J (.",:; I MM lint i:;'i:, i:;"l l.ilO VM't l.;n7 i:;!io V2'n\ t.'T 1 r.':,o iL'.ili (■j:i:i IL'OJ ■Ij'is lli:i liin:i 1(1 i:i 1110:, \.| \\i \\(i;;l'i. \-rlnrlH 11:; .' ;, i.;7 1 ; \'.| Wi, i.".i I ij.; .'II .' I NV 1.". •2S mi i .' I ! vji;7 \ . 1 W 1 III s IJI .'I >-- I r ■2s 1 Hi l:;.' '.I N.") •■) ; id:; III'' :; ; in:; I, IIJ !l l.ii :■ 111 1 ■.17 :; ll' no 7 III ; Hill II I III SI is 'i:;i \ . I w 1 \,\ w I 17-7 i:i.sj Hill : 117 :; 1 .' 1 ■ 2 l.'M S 1.':; s| .'I 1:; . JS - 111.'. I -KI.V IL'.' ! \.l Ui i.lO L' r;i (1 1.':; 1 II I 1; I'.'l llli- I 1; SI) ■Jl r,:; IJ ■ Js :iOa; L'l (I L'l I, :;n ." L'l 7 II 1 I.VJ IS 7 ;;■> .;; I si; ."iJ 1 l.'j. I L'l; !i sc, i.'7:v :i'-' 7 jr, I 1:, 7 L"l •_' T :il 7, :;ii-.'s Is S'l II.". ■2s II II (ii;iiri> 111" iiir, .^I'liciuoMoric ( (imimimais hi jd tt cx^.^i'ii'i:!.!': 147 A pint of ihc ()l><('rva1i'>n> >li(i\v<'il the period to he aiiproximutcly 2 ilav-. I -inn tl'c four early ohservaliotis in ('(injunction with our own, the period was found to he l<,lt)4()S days. The jilates were frroupod aceording to jihase into 20 normal places, the first 11 r('pres(>ntin{5 coiii])on(nt I and the last '.» component II. MiU.MAI, I'l.ACI'.S s ft 1(1 II ij l:> I I 15 111 17 IS 1!» •-'0 Mian Mr;lll 1 (1 (■ ( ) ( ' i>h:w.c \i Icicily W.-iglii ■:!:! I'ri'liiiiiiiLiry hnal i:.i-Kp 1, (KM + !tlH - 4 4 - ()•! + (Mi:! -t- 74i» •7;i - .-.■<• — '2it t- •237 +- r-' t ■S!» - -> 4 — 2-2 4- •403 - 7IMt • 17 - 4-4 - 7 II - • ".no - Ill) 1 •Ss + 3-4 + 1(1 ~ !I7T - 711 ■SI + 10 - 0-2 - 1 Jii 1 4- 10 !• 111 - IS - 2 1 1 I'.l.-) + 101 li :il - 1-3 + 1-2 lil.'7 + rjs:, ■ :<•"> - ()■!• - ■'••'' -t 17I11 + l:io .7j - .■,() - O.'i + ■DIM - 7:i:! ■ ■-'! i + 0-7 - 21 - ■ (Ki:i - .".■>•!» -Itii - oi; - 2-.J - •4ti3 + sir, - ilt'i - 9-J - .-> 1 •.-.99 + I2:M lis - ii-(i - ■S14 Hll.Vl-7 .'.li 1 0-3 t :! - ■!t7'.l ^ !ts-,") ■ .'jS - (»■;! + I'.i - 1 ■ m:. - 71 1 Is t- iMi -t- .-.(1 1 r,72 -ll()-7 ■•-M - -' () - oO -f 1 7.-|S - 9S1 ■ .").") + 12-.'? 1 + S-4 1 'I'he preliminary values of tiie elements used \v.;re. /' = 1 -OtUOS day- ( -= -02 wi = 4.j^ 01, = 22:r y = +i:Mn km. A', = 121 km. K, - 122-42 km. T = J. n. 2.4 10, ',170 -n:?.-) I'^^inp; tlie;,' 1 S!( 1 nun III 1 17 1 linn li.'jS -n;i 1 niH s:i| ."),S 1 nun - !l."ill SI 1 linn 70 1 1 1 1 nun - nn:; :u 1 linn • ■ 7 rj ■:i."i 1 oiin '.Hi) -■> 1 mill ■ 1 nn7 ■Jii 1 nnn 'I'.i'i 1 nnn ■ :ii; 1 mill ■ tis 1 nnn •.">tj 1 nnn • .'jS 1 nnn ■is 1 nnn 21 I nnn • .".'i 1 niiii - 712 - ."i.'.'.i • ( i.ls ■\- 'UK'. f it",!) |. V(l(l - 712 - ',i!IS -1 1 11(11) sii; - ■ ss;i _ I l-n ' i:;ii - 1 n:i2 _ .■>■() --() ■St ill -1 .■>■>" _ 2 1 n '- •!i:U - (til _ 11 n - O'.K) - • o2;i + .■. 1 ) - n -1 171 + ■;jo«i + .-i 1 = 1) t- •SSJ + •Si.-) + 1 1) ^ 1) - •SKI + 1 • liKi _ 1 S=l) - •so.) -t- •,si:i _ Mi=(l + ■ l.w -i- ■;{7:{ _ ((■!)=ll + 1 IKili - ■lti2 _ .■ () =0 - ■S.">(i + •.S<)» + 7- n - ■ 1.!.-. ^ 1 (lit _ li - ■'II.-. ^- '.121 _ '.) 2 -n •h (MS ■Km; - >i 1) -1 •isl - ■ :i()S , (1 .1 (1 - ss:i - ■SlO - n :; n f- ■SI 1 - .s2.''. 1; ll - ■I'.i'.i - 20:; _ 2 ( 1 ■ n -1 ■1)2:1 -f 111 f 2 ;; AOUM.M. K(^r\-ri(i\,- 11 2!t(i.r ■■jss//, + ■:^(i7,//, - i-.j.-)(c + ■•_'r)SM + .-)-7,-)2 = •'^■■^"'■'.'/i H- luiL- - ■;',ii4// + 1274:'. -; •-'■7;!sy/ -1 -wr^z - ■4r)ti, + ••■s:^.") -^■ 7 ■■_'.-,;!- + ■\\\{)u f 7.:i:^i ^ "■.")(„)(, - W'.W- - Fnini tlio<(^ of|iiati(in> tcMiltcd the (•(prrcctidii-. 07 = -0-(iN km. 5A', = -:MiS !.,ii. ;5A', = -;5^4.-. km. 3' WfM™lDl]l]bTs'i™™'=| he = -0010 Sw = +(i ■OS Tlic valun of v/»r fur the imnnal plac,.- \va> ivdn.rd fnmi I'ls.:! tu llti7 The arr.impaiiyin,; urapl, rciim-cm- llm final ..k.m.mt.. ami llic nliHTvaii-ns a> Kn-upcl ''"'"' l"'"'':'''l'' ''iT'ir f.ir a plate lur (■,.mp„nctit II i- -:,-,.() km. per .(■.• "ami f„r -•o.np.mcnt I is 14-7 km. prr ..r. The taMn l,eluu frivn^ ll„. ..Ininents from .lu' ;|.':-; : ;-;ir I ;i;' wint-i>i iilui inircvisccl ami revised u ;i\-r.-!i.!!i.t!,.;. 'ri,,. !,.t !....■ ..,!:..; arc (uiisidenHi llnal. 'i'lic |.iulialilc cndiv arc altaclmd. (ii{iur-< III iiir. srr.cTiioscdi'ic cdMi'dMArs (-i' j(i7r cvssKirni: 149 I'^liilioiit /' 1 IHilOSiillVS ( (HKI oil- 4.->- 1 u, 2--'.V' 1 A-. 'ill7-7li km a:. 117-40 km 7 -t-Hll-J km T . .1. 1). ■.'.41".t.'.'7llli:!."i II, sill 1 :J.lS(l,:i(M) km II, sill 1 i:},170,.')»M)km iiii sin'' 1, . 1 :!'.> O Ill, sin'' (■ 1 :i:i O I'inal Valius 1 9()4(»S ilays •IIIO ' (KI7 4rp"l J (l°-4 •SSi 1 ■ (I' 4 1I7:;2 km. (IOC. km. ll.^'.l" km. • I IIS km. + !■_' 4'J km. • II .".I km .1. 1). J,4l'.i.!l70 llii.-. :!.1I)S.4(H) km. :!.'2i:i,IH)(lkm. i:i-) O i;i4 O Duiuininii Ohsorvutdiy Ottawa St'ptciulipr, 1U17 1 5 JUIN 1999 feft iru) IMIU.[C\ll((\s (»I nil l)(i\II\|n\ (IUSI I!\ VTiiin 5 ,0 Kadifil Vrluclly f'urvcs uf 20 ir Cassidpi'icp