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

                     NUMBER 405

                              Konkoly Observatory
                              Budapest
                              1969 November 19


                  UV Cet

      A continual photoelectric monitoring of the flare
star UV Cet was done with the 91 cm reflector of Okayama
Station from 18 to 21 September and from 3 to 12 October
1969 by the request of the Working Group of UV Cet stars.
During the 33 hours of monitoring in the magnitude B,
30 flares were observed as shown in the following tables:

The definition of m_f(B), P and sigma are as follows:

m_f = m_0 - 2.5 log I_(0+f)+/I_0

P = Integral{(I_(0+f)/I_0)dt}

sigma(mag) = 2.5 log (I_0+sigma)/I_0.



                        Flares of UV Cet observed at Okayama
                              18 to 20 September, 1969

Date        Time of     Time of
1969      Monitoring      max     m_f (B)       Flares    Duration sigma         
Sept.        (UT)         (UT)                    P     
                                      mag            min      min       mag
18      15h51m-19h13m   16h15.4m  0.64          0.45       1.2      0.10
                        16 29.5   0.52          0.10       0.2      0.15
                        17 46.0   0.53          1.29      10.0      0.10
                        18 19.3   0.67
                                                4.43      20.0      0.11
                        18 26.1   0.80          
19      15 37 -19 20    16 39.6   3.40         21.13       8.3      0.12
20      15 50 -19 06    15 20.7   1.26          0.41       0.7      0.27
                        16 05.4   0.66          0.07       0.1      0.14
                        17 46.1   1.33          0.55       2.1      0.16
                        18 10.1   0.84          1.93       8.3      0.28
                        18 58.8   1.53          1.24       1.8      0.35



                        Flares of UV Cet observed at Okayama
                              3 to 12 October, 1969

Date        Time of     Time of
1969      Monitoring      max     m_f (B)       Flares    Duration sigma         
Oct.         (UT)         (UT)                    P     
                                                                           
 6      17h42m-18h33m                 mag           min       min       mag
 8      17 00 -19 00    18h25.6m  0.70          0.62       2.0      0.08
                        18 44.9   1.31          0.85       2.3      0.09
 9      12 50 -18 30    13 37.5   0.69          0.14       0.5      0.12
10      11 53 -15 19    13 16.3   0.58          0.94       4.7      0.14
                        13 45.3   0.89          0.43       1.8      0.12
                        14 28.5   0.64          0.10       0.2      0.12
                        14 35.3   1.21          0.60       2.7      0.13
        16 32 -18 40    17 03.9   0.60          0.08       0.8      0.13
11      15 47 -18 50    16 50.7   1.02          0.67       2.7      0.06
12      11 55 -18 01    13 51.7   0.58          0.09       0.4      0.09
                        13 56.2   2.78          8.45       4.2      0.09 
                        14 13.9   0.45          0.05       0.5      0.12
                        14 15.9   0.74          0.69       2.7      0.12
                        15 14.2   1.05
                                                1.02       4.0      0.06
                        15 16.0   0.49
                        15 27.3   0.64          0.40       3.0      0.06
                        16 00.0   0.80          0.65       2.6      0.06
                        17 06.9   0.26          0.28       3.0      0.06
                        17 44.1   0.36          0.04       0.2      0.06


Tokyo Astronomical Observatory
14 November 1969                     .



                      H. OSAWA   K. ICHIMURA
                      T. NOGUCHI E. WATANABE
                      T. OKADA   K. OKIDA



                  [From IBVS 411]

Correction to IBVS 405: The time of monitoring of 1969         
                        Sep 20 should be read 15h05m-19h06m
                        (instead of 15h50m).