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

                     NUMBER 426

                              Konkoly Observatory
                              Budapest
                              1970 April 6


        FLARES OF YZ CMi OBSERVED AT OKAYAMA,
          31 JANUARY TO 13 FEBRUARY, 1970

      A continual photoelectric monitoring of the flare
star YZ CMi was done with the 91 cm reflector of the Okayama
station from 31 January to 13 February, 1970. During the
68 hours of monitoring in B, 20 flares were observed as shown
in the following table.



Date            time            time of       m (B)      P     Duration
1970       of monitoring (UT)   max (UT)       f                        sigma
                                                                           mag
Jan.31     10h37m-11h42m                                                0.05
Feb. 1     10 10 -10 46         10h22m.6      0.64^mag  0.8^mag  5^min  0.05
           11 21 -12 13                                                 0.05
           13 04 -13 39                                                 0.05
           14 01 -14 28                                                 0.05
           14 56 -15 05                                                 0.05
           15 13 -15 28                                                 0.05
           15 46 -18 02         16 11.2      >4.3                       0.05
                                                   >141      >94   
                                17 28.9      >0.37                     cloudy
     2     11 59 -12 55                                                 0.03
           14 40 -14 51                                                 0.03
           15 20 -18 40                                                 0.03
     3      9 58 -13 48         11 37.3       0.27      3.5      2.5    0.04
           15 11 -16 10                                                 0.04 
           16 38 -17 28                                                 0.04
     4      9 58 -14 28         10 36.9       0.43      1.1     10      0.04
                                13 12.9       0.31      0.2      3      0.04
                                13 18.8       0.15      0.05     1      0.04
           15 15 -15 43                                                 0.04
     5      9 03 -12 40         11 14.6       0.34      1.7     15      0.03
           17 05 -18 40                                                 0.03
     6      9 36 -10 10                                                 0.06
           10 21 -18 10         11 13.4       0.34      0.2      0.5    0.05
                                16 54.2       0.45      0.3      2      0.05
     8     10 40 -15 34         14 17.0       0.27      0.5      3.5    0.04
                                14 50.5       0.44      0.2      1.5    0.04
     9     15 35 -17 40                                                 0.04
    10     10 42 -11 50                                                 0.02
           12 28 -14 34         13 26.2       0.40      0.2      1.5    0.02
    11     10 45 -17 40         11 35.5       0.14      0.6      8      0.03
                                13 38.5       0.33      0.1      1      0.03
                                13 48.7       0.23      0.3      4      0.03
                                13 59.3       0.31      0.2      2.5    0.03
                                15 35.6       0.10      0.1      1      0.03
                                15 42.0       0.13      0.4      5      0.03
                                16 09.6       0.18      0.1      0.6    0.03
    12      9 44 -13 28          9 48.5      >0.93     >8       19      0.04
           14 13 -18 13                                                 0.04
    13      9 45 -18 15                                                 0.04 
                                                                


Tokyo Astronomical Observatory
17 March 1970

                       K. OSAWA   K. ICHIMURA
                       T. NOGUCHI E. WATANABE
                       T. OKADA   K. OKIDA