COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1587

                                 Konkoly Observatory
                                 Budapest
                                 1979 April 24




   OBSERVATIONS OF V645 CENTAURI AND YZ CANIS MINORIS


V 645 Cen
The flare star V 645 Cen (R.A.14h26m42s, declination -62d29'
(1950), 11.3 visual magnitude at minimum, spectral type dM5e)
was observed at Boyden Observatory on the night of 16/17 April
1975. The 41 cm Nishimura reflector was used with an uncooled
EMI 6256A photomultiplier tube and a standard Johnson B filter.
One low intensity flare was noted during the monitoring period
from 19h27m07s U.T. on 16 April to 03h42m15s U.T. on 17 April.
(There was an interruption in the observations from 21h54m00s
U.T. to 22h01m30s U.T. on 16 April.)

YZ CMi
The flare star YZ CMi (R.A.07h42m6s, declination +3d41' (1950),
11.6 visual magnitude at minimum, spectral type dM4.5e) was 
monitored at Boyden Observatory during the night of 22/23 January
1976. Weather conditions were such that worthwile observations
were only possible between 19h21m00s and 23h00m00s U.T. One 
intense flare was recorded during the period.


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           Flare maximum   (I_0+f - I_0)/I_0 = sigma(mag)         = (m_lim - m_0)
Flare star Universal Time                      -2.5log|sigma|/I_0   sigma(mag) - 1.19
V 645 Cen 02h53m15s               1.08         2.59                     -
YZ CMi    20h49m30s               5.14         2.43                    1.24
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We are greatly indebted to Prof. F.D.I. Hodgson, the Director of
the Institute of Groundwater studies at the university, for 
access to his department's Hewlett Packard Model 9825 microcomputer
and digitizer for the reduction of our data.




                     A.H. JARRETT and J. VAN ROOYEN
                   Boyden Observatory, Astronomy Department
                   University of the Orange Free State
                   Bloemfontein, Republic of South Africa


                       [FIGURE 1]