1 7 6 
RESEARCHES IN STELLAR PHOTOMETRY. 
MAGNITUDES OF COMPARISON STARS. 
The standard magnitude stars in the two fields in the constellation Cassiopeiae 
are distinguished from those in the other ten fields in that they are fainter in 
the Harvard than in the Potsdam Catalogue. The difference is only —o.n in 
the Z Cassiopeiae field, where it might be partially accounted for by the use of 
only two stars. But in this field, for three stars, the difference amounts to 
— 0.27. That this is not accidental, nor entirely due to the star colors, is shown by 
the standards in two “Rumford” fields, U and S Cassiopeia?, where the differences 
are —0.16 and — 0.01, respectively, so that the mean difference for the four fields 
in this constellation is — 0.14, as compared with To.29 for the other ten fields 
here considered. If the Harvard scale is adopted for this field the limit of vision 
of the 6-inch becomes 13.53 from the star «, an abnormally faint limit. 
Table 109.—8629 Y Cassiopeia. Comparison Stars in B. D. Catalogue. 
Star. 
B. D. 
1855. 
No. 
Mag. 
R. A. 
Dec. 
P 
O 
+ 54 3096 
9-5 
h m s 
23 54 45 
O / 
+ 54 3 S .5 
0 
+ 54 3098 
9 -i 
23 54 55 
+ 54 36.7 
l 
+ 54 3099 
9-5 
23 55 3 
+ 54 48-8 
B 
+ 54 3 ioi 
8-3 
23 55 13 
+ 54 46.9 
Star. 
B. D. 
1855 - 
No. 
Mag. 
R. A. 
Dec. 
O 
+ 54 3 102 
9-5 
h m s 
23 55 42 
O / 
+ 54 45 -6 
A 
+ 54 3103 
7-9 
23 56 2 
+ 54 44-9 
m 
+ 54 3105 
9-5 
23 56 42 
+ 54 54-0 
0 
+ 55 3078 
9-i 
23 56 40 
+ 55 13-3 
Table no.—C omparison Stars for Y Cassiopeia (in Order of Right Ascension). 
Star. 
Coordinates from Variable. 
Light 
Scale, 
Steps. 
R. A. 
Dec. 
n 
s 
n 
P' 
-637 
- 74-3 
— 822 
.... 
O 
-536 
-62.5 
- 945 
27.2 
9 
-509 
- 59-4 
+ 328 
.... 
l 
-457 
- 53-3 
- 170 
23.2 
o ' 
-438 
- 5 II 
+ 343 
.... 
B 
-397 
-46.4 
- 387 
.... 
k 
-186 
— 21.7 
+ 112 
4-4 
h 
-125 
—14.6 
+ 92 
7 -i 
s 
— 122 
-14.2 
— 426 
.... 
P 
— 122 
-14.2 
+ 406 
.... 
g 
- 87 
— 10.2 
+ 64 
6.0 
b 
+ 1 
+ 0.1 
+ 50 
19.6 
d 
+ 19 
+ 2.2 
+ 141 
10.8 
/ 
+ 23 
+ 2.7 
+ 6 
7.8 
A 
+ 49 
+ 5-7 
- 470 
.... 
z * 
+ 51 
+ 6.0 
- 73 
0.0 
e 
+ 54 
+ 6.3 
+ 50 
5-9 
a 
+ 60 
+ 7.0 
- 103 
2.1 
c 
+ no 
+ 12.8 
+ in 
16.3 
n 
+ 128 
+ 14.9 
+ 497 
.... 
t 
+ 223 
+ 26.0 
- 505 
.... 
0 
+ 393 
+ 45.8 
+ 1287 
31-8 
m 
+ 426 
+ 49-7 
+ 150 
25.0 
r 
+ 479 
+ 55-9 
+ 139 
.... 
Magnitude. 
Measured. 
H. 
10 
12 
10 
11 
12 
7 
14 
13 
10 
10 
87 
35 
10 
82 
46 
43 
13 
77 
01 
53 
7 i 
02 
12 
10 
11 
11 
7 
13 
13 
10 
60 
08 
83 
55 
19 
16 
86 
50 
74 
26 
44 
75 
From Curve. 
H 
9-17 
13.09 
12.60 
12.83 
8.40 
P. 
8.90 
12.82 
12.33 
12.56 
8.13 
*The preceding component. 
