COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       NUMBER 534


                              Konkoly Observatory
                              Budapest
                              1971 April 7




          PHOTOELECTRIC OBSERVATIONS OF AD Leo


       The photoelectric observations of the flare star
AD Leo were carried out at the Crimean Astrophysical 
Observatory during the period of February 18 - March 4, 1971.
The total time of continuous monitoring in the B photometric 
system was equal to 26.6 hours.
       The moments of the beginning and the end of 
continuous monitoring are given in Table I. Table II contains
the time of maximum of the flares observed, duration before
and after the maximum, t_b and t_a, relative intensities at
maximum (I_fl - I_0)/I_0, errors of observation sigma/I_0, integrated
intensities P and air masses F(z), The light curves of
flares are presented on figures.



                                Table 1
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1971                           Coverage   (UT)
-----------------------------------------------------------------------------------
Febr.18   17 01-17 16, 17 34-17 36, 17 37-18 15, 18 16-20 55,
          20 59-22 24, 22 28-22 37, 22 42-23 20, 23 21-24 00.
Febr.19   00 00-00 44.
Febr.20   17 08-17 28, 17 30-19 29, 19 30-19 46, 19 48-21 33,
          21 35-21 45, 21 47-21 53, 21 59-22 03, 22 06-22 15,
          22 19-22 34, 22 36-24 00.
Febr.21   00 00-01 09, 17 35-19 38, 19 39-22 31, 22 32-23 01,
          23 03-23 11, 23 12-24 00,
Febr.22   00 00-03 00, 17 01-17 39, 17 51-18 15.
Febr.23   17 32-18 02, 18 05-18 19, 18 20-18 29.
Febr.25   00 57-01 32.
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                             [FIGURE 1]


                             Table 2
--------------------------------------------------------------------
Date             t_b   t_a                              P_min
1971   UT_max     minutes   (I_fl - I_0)/I_0  sigma/I_0         F(z)
Febr.
--------------------------------------------------------------------
18     22 34.8   0.2   1.4       0.09          0.02      0.04   1.11
18     23 05.3   9.8   29        1.27          0.02      8.47   1.12
--------------------------------------------------------------------


                          P.F. CHUGAINOV
                          N.I. SHAKHOVSKAYA
                   Crimean Astrophysical Observatory




Correction to IBVS No. 176
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Star name   Printed                 Read
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RW CMa      28201.83+5.72941 E      27021.68+5.72906 E
RW Cas      37168.23                37158.23
UX Per               4.97247 E               4.56581 E
------------------------------------------------------