CIHM
Microfiche
Series
(Mor.ographs)
ICMH
Collection de
microfiches
(monographles)
Canadian Institute for Historical Microreproductlons / Institut canadien de microreproductions historiques
V.\iN
Technical and Bibliographic N
'Ji rt.
The Institute has attempted to obtain the best original
copy available for filming. Features of this copy which
may be bibliographicaliy unique, which may alter any of
the images in the reproduction, or which may
significantly change the usual method of filming are
checked below.
D
Coloured covers /
Couverture de couleur
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I'ombre ou de la distorsion le long de la marge
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Blank leaves added during restorations may appear
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blanches ajoutees lors d'une reslauraticn
apparaissent dans le texte, mais, lorsque ceia etait
possible, ces pages n'ont pas ele filmees.
D
D
D
D
Notes techniques et bibliographiques
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,
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D
D
D
D
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Continuous pagination.
TV.:.. :4«p» :. t:i
Ce document est filme au taux de reduction indicue ci-dessous.
lOx
14x
18x
22x
26x
30x
i
12x
16x
20x
24x
28x
32x
The copy filmed here has been reproduced thanks
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tcole polytechnique,
Universite rie Montreal,
Bibl iotheque
The images appearing here are the best quality
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g6n6rosit6 de:
Ecole polytechnique,
Universite dc Montreal,
Bibl iotheque
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plus grand soin. compte tenu do la condition et
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The last recorded frame on each microfiche
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whichever applies.
Un des symbolas suivants apparaitra sur la
derniire image de chaque microfiche, selon le
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Maps, plates, charts, etc., may be filmed at
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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:
Les cartes, planches, tableaux, etc., peuvent etre
film^s k des taux de reduction diff^rents.
Lorsque le document est trop grand pour etre
reproduit en un seul cliche, il est film§ d partir
de Tangle sup^rieur gauche, de gauche i droite,
et de haut en bas, en prenant le nombre
d'images n^cessaire. 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<iO-64fl
(1)
4540 766
(28)
4233 328
(4)
4.522 S71
(1)
4202 161
(1)
4481-400
(40)
4198-494
(1)
-4383-720
(5)
4143-928
(3)
4340-634
(27)
4101-890
(1)
42,89-915
(3)
4045-975
(2)
4271-760
(2)
3933-825
(12)
The observations follow: —
OTTAWA OB.SERVATIONS (>. 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
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+51-1
+ 15 -6
8010
8016
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8017
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185
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+ 49 49
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+ 14S-8
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THF. Sl'KCTROSCUPIC BINARY BIJSS 1275
193
MKASUUKS OK bUSS V>7r,-('outtiiiu<i
8333 i>.
8333 s.
8341 p.
8341 3.
8372 p.
.s:i72 ».
8;i70
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+ 49-00
+ 09-15
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-122 30
-121-50
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2
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- 38-43
- 01-32
1
4549 7011
4481-400
+ 133-80
1
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4383 - 720
4
4340 034
4233 - 328
- 80-75
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+ 111-30
1
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mean
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+ IS 00
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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
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- 14
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+ 79-0
-128;i
THK SPKCTIlOSCOriC HINARY HOSS 127:)
195
MEASl'RES OK BOSS \2'r,-Condwle,l
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- 22
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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
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