102 
RESEARCHES IN STELLAR PHOTOMETRY. 
Table 6 o. —6100 RV Hercuus. Observed Maxima and Minima. 
Elements of maximum. 1898, March 12 (J. D. 2414361) + 2001 E. M — m= 81 d . 
Maxima. 
aa 
Date. 
Mag. 
U 
Corr. 
Wt. 
2 
W 
Calendar. 
J- D 
H. 
P. 
— 1 
1897 Aug. 23 
4160 
me 
— 1 
10 
0 
1898 Mar. 15 
4364 
10.50 
10.75 
+ 3 
12 
1 
Sept. 28 
456 i 
10.6 
10.8 
0 
20 
2 
1899 Apr. 6 
475 i 
9.68 
9 93 
— 10 
17 
3 
Nov. 1 
4960 
10.25 
10.50 
— 1 
12 
4 
1900 May 21 
5161 
11.30 
n -55 
0 
12 
5 
Dec. 6 
536 o 
me 
— 1 
I 
6 
1901 June 29 
5565 
me 
+ 4 
1 
7 
1902 Jan. 22 
5772 
me 
4 -11 
2 
9 
1903 Feb. 24 
6170 
me 
+ 9 
2 
10 
Sept. 22 
6380 
me 
+ 19 
1 
11 
1904 Apr. 2 
6572 
me 
4 -11 
1 
12 
Oct. 18 
6772 
me 
4 -11 
3 
13 
1905 June 14 
7011 
9.70 
9-95 
4-50 
15 
Minima. 
aa 
0 
0 
a 
W 
Date. 
Mag. 
Corr. 
Wt. 
Calendar. 
J. D. 
H. 
P. 
0 
1897 Dee. 1 
4260 
me 
— 20 
1 
1 
1898 July 2 
4473 
15-3 
15.6 
- 7 
8 
2 
1899 Jan. 15 
4670 
me 
— 10 
1 
3 
Aug. 11 
4878 
me 
— 2 
1 
4 
1900 Feb. 17 
5068 
15-35 
15.60 
—12 
12 
5 
Sept. 11 
5274 
14-97 
15.22 
- 6 
8 
6 
1901 Mar. 26 
5470 
me 
— 10 
1 
7 
Oct. 29 
5687 
me 
4 - 7 
2 
8 
1902 May 20 
5890 
me 
4-10 
0 
9 
Dec. 16 
6100 
me 
4 - 20 
0 
10 
1903 July 14 
6310 
me 
4-30 
1 
12 
1904 Aug. 3 
6696 
14.0 
14.2 
4-16 
2 
13 
1905 Mar. 15 
6880 
15.00 
15-25 
4-40 
9 
14 
Oct. 4 
7 I2 3 
15-40 
15-65 
+ 43 
12 
The mean light-curve was derived from the observations up to 1905 March 
5 (J. D. 6911). So far the period 200 days satisfied the measures, but the suc¬ 
ceeding observations, covering the maximum and minimum of epoch 12, indicate 
a slightly longer period, perhaps 204 days. The light-curve has several notable 
features. The range is more than five magnitudes, unusually large for the length 
of period. The decline is as rapid as the rise, and the minimum is as sharply 
defined as the maximum. There is a suspicion of a secondary maximum arising 
from three anomalous observations near the minima of epochs 11 and 12, 
but the evidence is hardly sufficient to definitely settle the question. A consider¬ 
able range will be noticed in the magnitude at the maxima, the star reaching 
9.7 at epochs 2 and 12, but only reaching 11.3 at epoch 4. 
