COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                    NUMBER 331

                              Konkoly Observatory
                              Budapest
                              1969 February 12

       FLARES OF YZ CMi OBSERVED AT OKAYAMA
   14 TO 16 DECEMBER, 1968 AND 14 TO 25 JANUARY, 1969

      A continual photoelectric monitoring of the flare
star YZ CMi was done with the 91-cm reflector of the
Okayama Station from 14 to 16 December, 1968, and from 14
to 25 January, 1969. The large flare on 14 January 1968,
of which the maximum DeltaB was more than 1.8 magnitudes may be
the largest one ever observed for YZ CMi. The following
Table shows the time of monitoring and the time of flares.
Some more details will be published in the Tokyo 
Astronomical Bulletin.

             Time of          Time of    max.  Duration   Integr.
  Date       Monitoring         max.    DeltaB           intensity
1968 Dec.14d 15h42m-18h15m  17h21.3m>   1.81mag 12min       6min
         15  14 49 - 19 30  15 25.5     0.17     0.7        0.1
                            17 33.5     0.52     6          2
                            19 12.3     0.24     3.2        0.2
         16  13 10 - 13 53  13 46.3     0.41     1.5        0.15
             14 04 - 15 09
             15 20 - 15 50
1969 Jan.14  14 26 - 15 03
             17 47 - 18 16
         15  10 20 - 13 04
             13 09 - 13 21
             16 10 - 16 18
             16 26 - 17 50
             18 36 - 19 03  18 47.2     0.37     0.3        0.06
         17  11 05 - 13 36
             16 16 - 18 44  17 31.4     0.92     4          0.7
             18 50 - 19 31
         19  12 50 - 13 12
             16 47 - 16 58
             17 13 - 17 19
         21  11 09 - 15 09
         22  13 30 - 19 00
         23  10 00 - 11 56
             13 00 - 17 22  16 19.0     0.45     2.4         0.2

  Integrated intensity = Intergral((I_flare - I_normal)/I_normal) dt.

  Tokyo Astronomical Observatory      K. OSAWA    K. ICHIMURA
  February 7, 1969.                   T. NOGUCHI  E. WATANABE