COMMISSION 27 OF THE I.A.U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 1416

                                                     Konkoly Observatory
                                                     Budapest
                                                     1978 April 25


   PHOTOELECTRIC MONITORING OF THE FLARE STAR YZ CMi

Continual photoelectric monitoring of the flare star
YZ CMi was carried out at the Okayama Station of the Tokyo 
Astronomical Observatory during the period of 4 to 10 January 1978.
   The observations were made with the synchronous three-
colour photometer attached to the 91 cm reflector. The observational 
results are summarized in the Table. The explanation of
symbols and detail of the observing equipment can be found in
Tokyo Astronomical Bulletin (2nd series) No. 222.
   Some more details will be published in the same Bulletin.

                             K. ICHIMURA
                             Y. SHIMIZU

                             Tokyo Astronomical Observatory



                  Flares of YZ CMi observed at Okayama
                         4 to 10 January, 1978

Date       Time of      Fil-   Time of   (I_0+f)-  Max.     P   d_b  d_a  sigma
       Monitoring (UT)  ter    Max.(UT)  (I_0)/I_0 Deltam
1978                                               mag.    min. min. min.  mag.
Jan.

6. 13h38m-16h58m         U     14h06.5m    8.89    2.49    7.0  0.4  4.6
                         B                 1.23    0.87    1.2  0.3  4.6
                         V                 0.31    0.29    0.3  0.2  3.0
                         U     15 16.3     0.51    0.45    0.2  0.3  0.8   0.15
                         B                 0.48    0.43    0.1  0.2  0.8   0.05
                         V                 ----    ----                    0.02
                         U     15 35.2     2.43    1.34    2.5  1.2  5.5
                         B                 0.27    0.26    1.3  0.9  4.2
                         V                 0.09    0.09    0.1  0.4  0.8
7. 15 38 - 16 01         U     15 47.3    11.40    2.73   15.5  0.2  8.5   0.10
                         B                 2.7     1.32    3.9  0.2  8.1   0.09
                         V                 0.34    0.32    1.0  0.2  8.0   0.03
8. 12 11 - 16 55         U     13 02.1     2.24    1.28    2.6  0.3  3.4   0.12
                         B                 0.29    0.28    0.3  0.2  3.2   0.06
                         V                 0.07    0.07    0.1  0.2  2.0   0.02
                         U     13 57.3     4.66    1.88
                         B                 0.71    0.58
                         V                 0.19    0.19
                         U     13 58.5     3.50    1.63   23.5  0.6 13.5   0.10
                         B                 0.47    0.42    3.6  0.6 13.3   0.05
                         V                 0.15    0.15    1.8  0.6 12.3   0.02
                         U     14 02.2     5.25    1.99
                         B                 0.92    0.71
                         V                 0.25    0.24
9. 14 19 - 15 01
   16 27 - 18 21         U     17 11.2     1.30    0.90    0.6  0.2  1.3   0.10
                         B                 0.27    0.26    0.1  0.1  1.0   0.03
                         V                 0.12    0.12    0.1  0.1  0.7   0.02