COMMISSION 27 OF THE I.A.U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 1275

                                                    Konkoly Observatory
                                                    Budapest
                                                    1977 May 11


              CSV 2851 - A RED DWARF VARIABLE

CSV 2851 = HV 10814 = BPM 61550 = CoD -38d11343 was introduced 
in 1973 in the research program on red dwarf variables of
the I.T.A. Astronomical Observatory (Ferraz Mello, S. and Torres,
C.A.O., 1971 I.B.V.S. 577) after a notes of Sanduleak, N. and
Stephenson, C.B. (1973 I.B.V.S. 770) showing that this suspected 
irregular variable was actually a dM3e star.
   The star was observed on 9 different nights against the
comparison stars CoD -38d11352 and CoD -38d11353. The last one was
not very stable, probably due to a nearby faint star that may
have been included inadvertently in the diaphragm on some nights.
But the observed variation is certainly due to CSV 2851. Although
the paucity of the data doesn't permit to obtain unambiguously
the period, we represent in Fig. 1 the light curve obtained with
the period that best fits the data, P=2.69d. The ordinates are
magnitude differences CSV 2851 minus CoD -38d11352 and the individual 
values are given in Table I.

   We obtained for the first comparison star a magnitude
V=9.40 and a color index B-V=1.23. A B-V=1.54 for CSV 2851 is
consistent with a dM3e spectral classification, and if we suppose
it to be a normal main sequence star, the visual magnitude of
11.2 would imply a parallax of the order of 0.09". (It is important 
to confirm this, and we note that the star is less than 1 deg
from Gl 646)


                                IVO C. BUSKO
                                GERMANO R. QUAST
                                CARLOS A.O. TORRES

                                Osservatorio Nacional
                                Rio de Janeiro-Brasil


                     [FIGURE 1]


               Table I

      JD       DeltaB   Delta(B-V)
   2441000+

   831.670     2.068     0.298
   831.677     2.086     0.305
   838.635     2.220     0.313
   839.617     2.046     0.265
   840.621     2.118     0.317
   841.695     2.147     0.292
   863.612     2.122     0.305
   872.586     2.074     0.278
   894.489     2.157     0.325
   895.507     2.176     0.338