COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 340


                                  Konkoly Observatory
                                  Budapest
                                  1969 March 29


         PHOTOELECTRIC OBSERVATIONS OF AD Leo

The results of photoelectric observations of the
flare star AD Leo made as a part of cooperative programme
in the period of 10-24 February 1969 are given  below.
The observations were obtained in the B-band with
the 64 cm meniscus telescope. The total coverage is 33.3
hours. The content of Tables I, II is identical with those
of papers (1) and (2). The light curves of flares (Figs.1,
2,3) are given in relative  intensities.

                         P.F. CHUGAINOV
                         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
(2)N.I. Shakhovskaya, (Photoelectric observations of YZ CMi),
   I.B.V.S. No. 339, 1969

   
                                                   Table I

Date             Coverage (U.T.)
1969

February 15    19h20m-19h10m, 19h23m-19h26m, 19h33m-20h08m
February 16    19h38m -24h00m
February 17    0h00m-03h30m
February 20    18h11m-18h18m, 18h23m-19h08m, 19h21m-19h24m,
               21h08m-21h39m
February 21    16h33m-24h00m
February 22    00h00m-03h15m, 17h22m-24h00m
February 23    00h00m-03h15m


                                               Table II

                      Durations                      
Date                   before                        Integrated    Air
of flare              and after  Deltam  Deltam_lim   intensity    mass
maximum               maximum,                  
                      minutes                   
                      tb    ta
Feb.16  22h33.3m      0.9   17   0.33   0.017   1.77     1.10
Feb.16  23h11.5m      1.0    6   0.16   0.014   0.22     1.13
Feb.17  01h24.6m      0.2    5   0.16   0.018   0.24     1.44
Feb.17  02h00.4m      0.2    2   0.09   0.018   0.07     1.64
Feb.21  23h33.5m      1.7    8   0.12   0.020   0.51     1.18
Feb.22  17h30.5m      0.2    1   0.39   0.030   0.12     1.92
Feb.22  18h36.6m      1.0   11   0.84   0.020   1.99     1.46
Feb.23  01h00.2m      0.2   12   0.57   0.050   1.29     1.44



                      [FIGURE 1]
                      [FIGURE 2]
                      [FIGURE 3]