RESEARCHES IN STELLAR PHOTOMETRY. 
I 16 
Table 69.—6894 S LyilE. Observed Maxima and Minima. 
Elements of maximum. 1898 May 12 (J. D. 2414422)+438 4 (E —4). M-m~154 d 
Maxima. 
Minima. 
J3 
Date. 
Mag. 
23 
Date. 
Mag. 
U 
Corr. 
wt. 
O 
Corr. 
Wt. 
C 
W 
Calendar. 
J. D. 
H. 
P. 
a, 
W 
Calendar. 
J. D. 
H. 
P. 
3 
1897 Mar. 4 
3988 
me 
4 - 4 
7 
4 
1897 Dec. 19 
4278 
me 
4 -10 
6 
+ 
1898 May 12 
,4422 
9-95 
10.37 
0 
20 
5 
1899 Feb. 13 
4699 
me 
- 7 
6 
5 
1899 July 7 
4843 
10.00 
10.42 
- 17 
27 
6 
1900 Apr. 25 
5135 
14.90 
I 5-32 
- 9 
16 
6 
1900 Sept. 29 
5292 
10.04 
10.46 
- 6 
9 
7 
1901 July 14 
558o 
me 
— 2 
1 
7 
1901 Dec. 26 
5745 
me 
4 - 9 
3 
8 
1902 Sept. 25 
6018 
14.90 
I 5-32 
— 2 
9 
8 
1903 Mar. 12 
6186 
me 
+ 12 
I 
Q 
ioo"? Dec. 
6462 
me 
4 - 4 
2 
9 
1904 May 23 
6624 
me 
4-12 
3 
10 
1905 Feb. 18 
6995 
15.01 
1543 
— 1 
14 
10 
1905 July 2 
7029 
10.60 
11.02 
4- 21 
24 
The last comparison used in deriving the mean light-curve was that of 1905 
March 12. The curve yields a period of 438 days. Several series of observations, 
covering the maxima between 1895 and 1900, have been published in the Astro¬ 
nomical Journal, by H. M. Parkhurst, who noted an “ intermediate maximum ” 
1896 July 14. Probably for this reason the period which had been given as 
430 days in Chandler’s Third Catalogue, was called 218 days in his “Revised 
Elements.” The present series excludes such intermediate maxima (except 
that no evidence is furnished for 1901). 
A single observation at Bonn, 1856 July 30, 9.5 magnitude, might refer 
to this star if a correction of one division of the ocular scale be admitted. If 
so, the star must have been very near maximum, and calling the epoch-31 the 
period 436 days results; but as stated above, at present the period is at least 
438 days. 
Leaving out of account the intermediate maximum in question, the light- 
curve presents no abnormal features. The total range observed is just about 
five magnitudes, the different maxima and minima being quite closely accordant, 
The rise is much faster than the decline, occupying but 35 per cent of the period. 
