COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 876

                                 Konkoly Observatory
                                 Budapest
                                 1974 March 15

    PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR YZ CMi



   Photoelectric monitoring of the flare star YZ CMi was
carried out at Okayama Station of the Tokyo Astronomical 
Observatory during the period of 18 to 24 January, 1974. The 
observations were made with the simultaneous three-color
photometer attached to the 91cm reflector.
   The observational results are summarized in the Table.
Some more details will be published in the Tokyo Astronomical
Bulletin.

      Time of      Filter  Time of  I_0+f-I_0/I_0  Max.      P    d_b    d_a   sigma   Weather
1974 monitoring            max.(UT)                Delta m
Jan.    (UT)
 18  11h19m-13h16m                                  mag     min   min    min    mag       1
     17 13 -19 08    U                  9.91       2.59    42.4  11.7   32.0    0.24
                     B     18h03.6m     1.65       1.05     4.5  11.7   26.5    0.04      1
                     V     18 03.7      0.37       0.36     2.1  12.1   28.0    0.02
 19  10 47 -12 15    U                  1.57       1.02     3.9   4.3    3.5    0.21 
                     B     12 05.3      0.33       0.31     0.8   3.7    3.5    0.05      1
                     V                  0.07       0.07     0.3   3.5    3.5    0.02
     12 30 -13 58    U                 10.71       2.68    11.0   0.7   20.0    0.16
                     B     12 44.5      1.79       1.11     3.1   0.7   20.0    0.04      0
                     V                  0.61       0.52     1.8   0.7   20.0    0.02
                     U                  3.03       1.53           1.3   20.0   
                     B     13 21.4      0.73       0.60           1.3   19.0              0
                     V                  0.19       0.19           1.3   19.0 
                     U     13 23.3      1.76       1.10   U 10.9              U 0.16
                     B     13 23.4      0.42       0.38   B  2.8              B 0.04      0
                     V                  0.13       0.13   V  1.1              V 0.02
                     U     13 24.1      3.27       1.58   
                     B     13 24.0      0.66       0.53                                   0
                     V     13 23.9      0.22       0.22   
     14 49 -16 45                                                             U 0.15   
                                                                              B 0.05      1
                                                                              V 0.02
 21  16 51 -18 30    U                  5.67       2.06      5.6   0.5    5.3   0.17
                     B     17 01.6      0.81       0.64      0.6   0.4    3.5   0.04      0
                     V                  0.17       0.17      0.1   0.4    2.0   0.01
 22  10 57 -11 44                                                             U 0.17
     13 23 -14 12                                                             B 0.04      1~2
                                                                              V 0.02
     14 22 -14 35   
     
     14 55 -16 57    U                  7.55       2.32     37.6   1.3   32.0   0.09
                     B     15 03.4      1.04       0.77      5.2   1.3   28.0   0.04      0
                     V                  0.25       0.24      1.1   0.8   27.0   0.02
                     U     16 18.1      1.58       1.03            0.2    2.4   
                     B                  0.33       0.31            0.2    2.4             1
                     V        -           -          -    U  0.8              U 0.16
                                                          B  0.2              B 0.05 
                     U     16 18.6      1.43       0.97   V   -               V 0.02
                     B                  0.22       0.22                                   1
                     V        -           -          -    
 23  10 31 -13.25                                                             U 0.18
                                                                              B 0.07      1~2
                                                                              V 0.02
 24  10 15 -12.08                                                             U 0.21
                                                                              B 0.03      1~2
                                                                              V 0.02

Weather : 0 = very clear, 1 = clear, 2 = some thin clouds,
       3 = extended thin clouds, 4 = some clouds.



Tokyo Astronomical Observatory
February 27, 1974


                            K. OSAWA
                            K. ICHIMURA
                            T. OKADA
                            K. OKIDA
                            M. YUTANI
                            H. KOYANO