COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 433

                                Konkoly Observatory
                                Budapest
                                1970 April 28


              PHOTOMETRY OF AD Leo

    Over the period 1st to 15th March 1970, observations
were made at Boyden Observatory of AD Leo as a part of the
International Co-operative Programme.
    The 40 cm Nishimura  Reflector was used in this work
fitted with a Johnson B. Filter and a solid CO2 cooled
E.M.I. 6256 photomultiplier tube.
    As evident from the table the monitoring time totalled 
41h07m. Three flares were recorded, each of low intensity.
    Flare No.1 is interesting in that it was of relatively 
long duration (approximately 13 minutes) similar 
to the one previously reported (A.H. Jarrett and J.P.Eksteen
MNASSA Vol XXVIII, page 70).




                        Monitoring table of AD Leo

 1970    U.T.                   Total   Flare   U.T. of   Duration  delta m
 March                          hours    No.     flare
                                 per
                                night
   1    18.31-19.50,20.54-21.25  1h50m  
   2    18.18-20.42,21.05-23.00  4 19    1      19h24.4m  12.6m      0.31
   3    18.07-23.05,23.22-00.12  5 48
   4    20.40-23.48              3 08   
   5    18.05-21.57,22.04-00.34  6 22    2      14 41.9    5.1       0.30
   6    18.01-21.20,21.32-22.32  4 19    3      21 53.2    4.1       0.28
   9    17.56-22.45,22.52-00.15  6 12
  10    17.47-22.45              4 58   
  11    17.52-22.03              4 11

                        Total   41h07m

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


                      A.H. JARRETT and J.P.EKSTEEN
                          Boyden Observatory
                       University of the Orange
                            Free State
                        Department of Astronomy
                           P.O. Box 334
                            Bloemfontein
                          Rep.of South Africa