COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1546

                                 Konkoly Observatory
                                 Budapest
                                 1979 February 5




    SYNCHRONOUS U, B, V FLARE OBSERVATIONS ON UV Ceti


   The flare observations on UV Ceti have been made at Maydanak
high-mountain expedition of Tashkent Astronomical Institute. In
the period from 1 to 14 of August 13 flares were detected on
UV Ceti. Some of them have been observed simultaneously in three
colours U,B and V by the 60-cm and 48-cm telescopes. The total
effective time of observations was about 26 hours.
   The measurements have been made by photon counters. The duration 
of each measurement w as 1.6 second. The precision of synchronization 
of observations for the instruments was 0.001 second.
    The data of observed flares are presented in Table 1. The
light curves of two flares, No. 6 and No. 13 are presented in
Figures 1 and 2 for illustration.
               


                    Table 1
-------------------------------------------------------------------
     Date of             Total duration
No   flare up       UT   of flare (sec)     DeltaU  DeltaB   DeltaV
-------------------------------------------------------------------
1     2 8 1978   22h12m30s   40               1.5m    0.4m    0.1m
2     4 8 1978   21 39 20    20               2.7     1.0     0.4
3     4 8 1978   21 43 15   110               2.7             0.2
4     4 8 1978   21 46 50    24               1.8
5     4 8 1978   22 41 08    26               1.9
6     4 8 1978   22 43 10    50               2.2     0.6     0.1
7     5 8 1978   23 13 40    20               3.5             0.4
8     7 8 1978   21 22 22    60                       1.9     0.2
9     7 8 1978   22 55 50  >180                       1.4
10    9 8 1978   20 54 30   110               3.7     2.4     0.6
11    9 8 1978   20 56 50  >3600              6.5    >4.3     3.2
12   10 8 1978   22 13 36  >180                       3.0     0.7
13   12 8 1978   23 13 50  >240               3.5     2.0     0.4
--------------------------------------------------------------------



N.D. MELIKIAN            N.N. KILJACHKOV, O.I. STALBOVSKY
Byurakan Astrophysical   G.P. SIGAL, V.E. SLUTZKY,
Observatory              A.I. JELEZNJAKOVA
                         Tashkent Astronomical Institute


                    [FIGURE 1]
                    [FIGURE 2]