COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 339


                                  Konkoly Observatory
                                  Budapest
                                  1969 March 29


        PHOTOELECTRIC OBSERVATIONS OF YZ CMi

      The results of photoelectric observations of the
flare star YZ CMi made as a part of cooperative programme
in the period of 11-25 January 1969 are given here.
      The observations were obtained in the B-band with
the 64-cm meniscus telescope. The total coverage is equal
to 33.7 hours. The content of Tables I,II is identical with
those of paper (1). The light curves of the flares have the
relative intensities (I_0+f-I_0)/I_0 ordinates and Universal
Time  as abscissae.

                          N.I. SHAKHOVSKAYA
                   Crimean Astrophysical Observatory

[References]
(1) P.F. Chugainov, (Photoelectric observations of UV Cet
   and YZ CMi), I.B.V.S. No 338, 1969


 Date                                                          Table I
 1969            Coverage (U.T.)

January   14    18h12m-18h30m, 19h00m-19h35m, 19h56m-20h40m,
                20h59m-21h42m, 21h45m-22h02m, 22h04m-23h04m
                23h08m-23h37m, 23h41m-23h55m
January   15    01h33m-01h39m, 01h42m-01h55m, 01h56m-02h00m
                (18h20m-18h27m,18h28m-18h32m, 18h35m-18h38m,
                18h45m-19h01m, 19h09m-19h43m, 19h50m-19h56m,
                20h11m-20h49m, 20h48m-21h14m),21h18m-21h59m,
                22h00m-22h39m, 22h40m-23h12m, 23h14m-23h34m,
                23h37m-23h55m
January   16    (00h00m-00h11m,00h12m-00h22m, 00h23m-00h29m,
                00h30m-00h49m, 00h50m-00h57m)            
January   17    10h41m-20h01m, 20h03m-21h09m, 21h14m-21h32m,
                21h33m-22h42m, 22h47m-23h41m, 23h41m-23h54m
January   18    18h00m-18h14m, 18h15m-18h20m, 18h22m-18h24m,
                18h27m-18h34m, 18h37m-18h43m, 18h44m-19h50m, 
                19h51m-20h48m, 21h09m-22h10m, 22h11m-22h29m,
                22h30m-23h10m, 23h14m-23h33m
January   19    17h53m-18h02m, 18h04m-18h13m, 18h14m-18h18m,
                18h28m-18h32m, 18h30m-19h02m, 19h08m-19h25m,
                19h27m-21h00m, 21h02m-22h28m, 22h29m-23h00m,
                23h03m-23h44m, 23h46m-24h00m
January   20    00h00m-00h30m
January   23    16h58m-21h40m, 21h49m-22h25m, 22h29m-24h00m
January   24    00h00m-00h47m





                           Table II

                  Durations                          Integrated     Air
Date and UT       before                             intensity      mass
of flare          and after    Deltam  Deltam_lim     minutes
maximum           maximum,                     
                  minutes                      
                  tb     ta
Jan.14 22h48.0m   0.2    0.7     0.32      0.06         0.32      1.36
Jan.14 23h10.0    2.0    1.4     0.35      0.06         0.08      1.40
Jan.15 20h17.0     ?     0.7     0.32      0.10         0.37      1.42
Jan.15 20h31.5    0.6    1.5     0.47      0.10         0.37      1.40
Jan.15 21h04.0    0.3    2.0     0.16      0.07         0.08      1.34
Jan.17 20h16.3    0.3    2.5     0.88      0.08         0.74      1.40
Jan.18 18h13.8    9.0   20.0     1.50      0.08        11.59      2.14


                       [FIGURE 1]
                       [FIGURE 2]