COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 349


                                    Konkoly Observatory
                                    Budapest
                                    1969 May 5


        PHOTOELECTRIC OBSERVATIONS OF UV Ceti


      As part of the UV Ceti international patrol the
star was monitored at the Boyden Observatory during eight
nights in October 1968. The 16" Nishimura reflector was
used, fitted with a standard Johnson B-filter and an EMI
photomultiplier tube cooled with solid carbondioxide. The
phototube output fed directly into a Hewlett Packard type
DY-2460A amplifier.
      As will be seen from Table I, 18 events were recorded
with a total of 23 maxima over an observing time of
approximately 30 hours. Inclement weather prevented further
observations.
      Delta m is considered accurate to within 5%, spurious or 
instrumental flares being eliminated.
      Flare activity was absent on two of the nights
during the observation period, but on the night of 24-25
October enhanced activity was evident as a flare rate of
one per hour, bringing the number for that night up to
8 with 10 maxima.
      The flares had 4 typical characteristics of UV Ceti
type flare stars. Additionally, about 30% of them showed a
rapid decline after the flash phase followed by a secondary
maximum and a gradual decline.
      A note (1) concerning these observations has been
published.

Ref. (1) J.P. EKSTEEN, MNASSA, 27, 145, 1968.



                  A.H. JARRETT and J.P. EKSTEEN
                Boyden Observatory, Bloemfontein
                     Rep. of South Africa


                               TABLE I.
                               UV Ceti
                      Monitoring Time and Observed Flares

Date                                         Total   Flare      UT   Duration     Delta m   
October        UT                            Hours    no.       of     Min.
1968                                       Per Night                 maximum   
13   19.47-22.12, 22.44-23.40                3h21m    1       20h29*5   8         0.20
                                                      2a      22 52 7   2         0.23
                                                      2b      22 55 4   8         0.70
                                                      3       23 08 5   3         0.86
                                                      4       23 22 0   7         0.81
14   20.34-22.18, 22.26-23.52                3 02
15   20.15-21.39                             1 24
19   17.37-21.11, 22.07-23.12                4 39     5       19 29 6   3         0.44
                                                      6       20 00 3   3         0.44
23   22.03-22.30, 22.39-0.00                 1 51     7       23 10 8   7         0.44
24   0.00-01.30, 17.34-23.33, 23.47-0.00     7 47     8       01 03 9   1.5       0.41
                                                      9       18 23 1  18         0.54
                                                      10a     19 31 5   9         0.61
                                                      10b     19 39     3         0.90
                                                      11      19 41 9   3         0.39
                                                      12a     20 43 3   3         0.52
                                                      12b     20 46 9   2         0.52
                                                      13a     22 41 2   3         0.64
                                                      13b     22 46 9   3         0.46
                                                      14      23 08 3   3         0.28
25   0.00-01.06, 20.7.3-21.29, 21.39-23.42   4 17     15      20 48 3   2         1.00
27   20.54-21.23, 21.37-21.47, 21.57-22.18,
     22.24-22.46, 23.00-0.00                 2 16     16a     23 43 5   1         0.30
                                                      16b     23 45 0   3         0.19
28   0.00-01.11                              1 11     17       0 21 4   3         0.49
                                                      18       0 37 0   6         0.35

TOTAL: 29H43M (8 nights out of a 16-night period)


                         [FIGURE 1]
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