COMMISSION 27 OF THE I. A. U
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 267

                                Konkoly Observatory
                                Budapest
                                1968 April 12


                      YZ CMi


A continual photoelectric monitoring of the flare star YZ CMi was done with the
91-cm reflector of the Okayama Station from January 22 to February 6, 1968, by
the request of the Working Group of UV Ceti type Stars. - During the 48 hours
of monitoring in total, 11 flares were observed as shown in the following
Table. - Some more details including the photographs of the recorder charts
are published in the Tokyo Astronomical Bulletin, Second Series No. 180.


Table 1.

Flares of YZ CMi observed at Okayama Jan. 22 to Feb. 6, 1968

             Time of                        Flares
Date        Monitoring
                              Time of Max.  delta m (B)   Duration
Jan. 22 10^h50^m -12^h41^m
        13  06   -14  18
     24 16  09   -16  13
        16  17   -16  25
            17 03  - 19 00    17^h22.5^m     0.22^mag     4^minutes
                              17  34.2       0.17         3
                              17  56.7       1.56        12
     25 10  11   -11  08
        11  12   -11  17
        12  00   -15  26      12  53.2       0.38         5
                              13  42.7       0.23         3
        18  07   -18  29
     26 10  17   -17  48
        18  11   -18  58
     27 10  03   -11  39
        14  20   -15  03
     28 11  07   -14  41

Jan. 30 15  13   -18  26
        18  36   -19  17
     31  9  43   -10  10
        10  10   -15  20      12   23.4     =0.35         ?
                              12   45.5     >0.35         ?
        15  32   -16  10
Feb. 1  14  05   -14  34
     2  10  26   -17  30      15   58.9      0.29         2
     5  10  01   -12  59      10   45.0      1.39        14
                              11   20.0      1.32        10
                              12   14.9      0.30         3
        13  07   -14  07
        16  08   -16  54
     6  13  57   -14  42
        17  36   -18  10


                                              K. OSAWA
                                              K. ICHIMURA
                                              T. NOGUCHI
                                              E. WATANABE
Tokyo Astronomical Observatory 
March 22, 1968.