COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 635

                                      Konkoly Observatory
                                      Budapest
                                      1972 February 28


                       YZ CMi


The photoelectric monitoring of the flare star YZ CMi was carried out at the
Okayama Station during the period of 9 to 22 January 1972. The observations
were made with the simultaneous three-colour photometer attached to the 91 cm
reflector.

The observational results are summarized in the Table.

                            Flares
Date    Time of       Filter  Time of    max.        P   Duration
1972  Monitoring(UT)          max(UT)   delta m     min.         Sigma

Jan
16  11^h50^m - 19^h38^m  U  12^h09.3m	 2.53      10.0    6.5
                         B               1.18       2.3    6.5
                         U  12 55.9      0.75       1.0    4.0   U 0.20^mag
                         B               0.23       0.2    4.0   B 0.04
                         U  16 07.8      0.73       0.8    1.5
                         B               0.14       0.1    1.5
                         U              >2.33     >41.2   11.5
17  11 43    - 18 37     B  14 36.9     >0.96      >8.4   11.5
                         V              >0.48      >2.0   11.5
                         U               0.61       0.3    1.3
                         B  16 36.0      0.16       0.1    1.3
                         V                -          -      -
                         U               0.87       0.5    2.0   U 0.16
                         B  16 58.7      0.16       0.2    2.0
                         V                -          -      -    B 0.05
                         U               1.02       1.2    0.7   V 0.03
                         B  17 34.5      0.16       0.1    0.7
                         V                -          -      -
                         U               2.15
                         B  18 01.9      0.97     U13.3    7.7
                         V               0.46     B 3.1    7.7
                         U               2.29
                         B  18 03.4      1.13     V 0.9    5.8
                         V               0.53
                         U               1.03       0.4    0.6     0.20
18  11  04   - 18 44     B  15 51.2      0.37       0.1    0.4     0.04
                         V                -          -      -      0.03

20  11  20   - 17 34     B  12 54.9      0.22       0.5    6.0
                         V                -          -      -
                         U               1.72       2.1    4.5
                         B  14 51.7      0.64       0.7    4.5   U 0.13
                         V               0.14       0.1    1.5
                                                                 B 0.05
                         U               1.99       6.9   10.5
                         B  15 38.6      0.74       1.6   10.5   V 0.04
                         V               0.25       0.6    9.0
                         U               1.07       1.6    4.5
                         B  16 23.1      0.28       0.5    4.5
                         V                -          -      -
                         U               0.75       1.2    3.0     0.19
21  13  00   - 16 46     B  16 24.7      0.21       0.3    3.0     0.03
                         V               0.06       0.1    2.0     0.02
                         U               0.83       2.0    6.0
22  10  57   - 14 26     B  14 00.6      0.21       0.7    6.0   U 0.20
                         V                -          -      -
                                                                 B 0.06
                         U               1.38       3.4    5.5
                         B  18 59.5      0.57       1.5    5.5   V 0.03
                         V               0.19       0.4    5.5


Tokyo Astronomical Observatory
15 February 1972.

K. OSAWA,    K. ICHIMURA,
Y. SHIMIZU,  E. WATANABE,
T. OKADA,    M. YUTANI,
H. KOYANO,   K. OKIDA.