COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 866

                               Konkoly Observatory
                               Budapest
                               1974 February 7

     PHOTOELECTRIC OBSERVATIONS OF EV Lac DURING

         THE 1973 INTERNATIONAL PATROL




   EV Lac was photoelectrically monitored at the Belgrade
Observatory during the night 1973 August 22/23 within the
international patrol interval.
   The observations lasted for 163 minutes covering the
following time intervals: 00 04 - 00 45; 00 57 - 01 19 and
01 22 - 03 02 UT. The observations were made in the V spectral 
region using an EMI 9502 S photomultiplier and GG-11
filter at the 65-cm refractor. The accuracy of the flare detection 
can be described by the error sigma_m = 0.010, and the
limiting magnitude difference Delta m_lim = +3.8 (the symbols have
been explained in IBVS No 627).

                         [FIGURE 1]

   A flare with intensity maximum at 0h27m9 UT has been
noticed. The light curve is shown in Figure 1. The dashed
part of the curve has been only approximately recorded because 
of guiding difficulties. The other characteristics of
the flare are: the intensity rise time Delta t_1=0.5m, the duration 
of the flare after the maximum Delta t_2=3.0m, the maximum
brightness difference Delta m_f=0.154 magnitudes, the integrated
intensity P=0.172m and the air mass X=1.050.

     J. ARSENIJEVIC,         A. KUBICELA,        I. VINCE

       Astronomical Observatory, Belgrade