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ICMH
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microfiches
(monographies)
Canadian Institute for Historical Microreproductions / Institut canadien de microreprouuctions historiques
f\f%f\
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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
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^ APPLIED ifvVIGE Inc
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<ii' Jill
DOMINION OBSERX ATORY
Ol'l \\V.\. CANADA
\u\. W. N.). ')
oiiHiTs OF 'I'm-: si'i;("ri{()S(()iM(' compom'a rs or io t cassfopki.k
lt\ W. i:. llAltl'I.K, M \
h
MT ^03
PO4-O9
This star (a=()'' :57"''.'. o-^+4()- 2*,l') was aniuiuiiccd as a siK'ctroscoiMc binary
liy Dircctcir Frost of the 'N'crkr.s Observatory in l'<>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
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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.
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'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<e values ar.d makiiiii the siilistitutions,
//, .- 5K:
c - l()()-5c
I, - lOO-Sw
V - [2-.')0.-)28l hT
observation eriuation^ eonneetinp; the elements were btiilt up in the usual way and a
n.:-.^f-^:iii-.r."^ ^i!!!;<h!P. ■•Tected- It wa--^ later found necessary to consider T fixed,
owing to the small \alue of c which made the coefficients of w and T practically t!ic
same.
148
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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
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(HKI
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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