COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 601

                                   Konkoly Observatory
                                   Budapest
                                   1971 December 21


        PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR UV CET 
        DURING THE 1971 OCTOBER 11-27 INTERNATIONAL PATROL


The preliminary results of UV Cet photoelectric observations carried out at
the Catania Astrophysical Observatory during the observing period proposed by
the IAU Working Group on Flare Stars (Andrews et al. 1971, IBVS 516) are
given.

The observations were made in b light with a 91 cm cassegrain type reflector
feeding a classical one-channel photoelectric photometer.

The patrol intervals in U.T. are given in Table 1. During the 1511 hours of
patrol time 9 flares were observed, the characteristics of which are given in
Table 2. The light curves of the observed flares in the b color of our natural
system are shown in Figures 1-3.

The explanation of symbols and details of the observing equipment can be
found in a preceeding number of this Bulletin (Cristaldi and Rodono 1971, 
IBVS 525).


S. CRISTALDI and M. RODONO
Cataina Astrophysical Observatory, Italy
December 6, 1971


Table 1.

Detailed Coverage

Date
1971              Coverage (U.T.)                         Total    -----------
Oct.                                                     coverage  3 sigma/I_0

11-12  22^h46^m-2258; 2300-2310; 2312-2328; 2330-2340;
       0000-0004; 0006-0108; 0110-0124                    145^m       0.40

   12  2131-2205; 2207-2215; 2216-2239                     65         0.50
   13  2137-2257; 2324-2400; 0000-2502                    178         0.46
16-17  2240-2400; 0000-0025; 0028-0054; 0101-0131         161         0.40
21-22  2108-2222; 2250-2400; 0000-0058; 0100-0101         204         0.41
   23  2024-2149                                           85         0.16
24-25  2156-2212; 2244-2312; 0004-0013; 0021-0034          66         0.14

Table 2.

Characteristics of Flares

                                            3sigma  I_f        E n e r g y   Air
no.    t_max(U.T.)      JD       d_b   d_a   ----  (---)_max  P    erg       mass   f  sky
        October         244...               I_or   I_0

1/71a 11, 23^h58.3^m 1236.5037   0.2   3.3    0.40  6.48    2.70 1.33x10^30  1.47   2  1
2/71  13, 23 40.6    1238.4916   0.1   0.3    0.43  1.85    0.22 1.09x10^29  1.46   0  4
3/71  14, 00 33.5    1238.5283   0.1   0.7    0.49  3.53    0.52 2.56x10^29  1.58   0  4
4/71  21, 21 37.1    1246.4057   0.1   1.4    0.42  2.51    0.57 2.81x10^29  1.51   0  1
5/71  21, 23 57.2    1246.4613   0.1   0.5    0.39  3.66    0.32 1.58x10^29  1.44   0  0
6/71  22, 00 53.2    1246.5419   0.1   3.9    0.42  7.22    4.00 1.97x10^30  1.85   2  0
7/71  23, 20 35.4    1248.3623   0.4   3.1    0.16  1.17    1.15 5.67x10^29  1.73   0  2
8/71  23, 20 38.7    1248.3649   0.2   3.6    0.16  3.26    0.87 4.32x10^29  1.71   0  2
9/71  23, 21 05.4    1248.3834   0.2   3.8    0.17  7.69    2.38 1.17x10^30  1.58   0  2
10/71 23, 21 19.2    1248.3930   0.9   7.9    0.16  1.00    1.53 7.54x10^29  1.54   0  2



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