COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1678

                                    Konkoly Observatory
                                    Budapest
                                    1979 September 26


             COMPARISON STARS FOR AM Her




    Photoelectric BVRI observations of three comparison stars
in the field of the X-ray source AM Her are presented. The 
comparison stars, along with a finding chart, are identified by
Liller (1977).
    The observations were begun in 1977 and continued through
1979. The instrumental system is described by Moffett and Barnes
(1979). The following telescopes were used; the 91-cm and 208-cm
at McDonald Observatory, the 61-cm at Table Mountain Observatory,
and the No. 2 91-cm at Kitt Peak National Observatory.
    The results are given in the following table where sigma 
represents the standard deviation and n is the number of 
observations.

                       Comparison Stars for AM Her

Star          V   +-sigma (B-V) +-sigma  (V-R) +-sigma (R-I) +-sigma  n

a           11.77   .02   0.94    .03    0.73    .02   0.49    .02   27
b           12.80   .02   0.58    .04    0.50    .03   0.33    .02   14
d           13.10   .06   0.61    .09    0.53    .05   0.36    .09   22

Our V magnitudes are in excellent agreement with those given
by Liller (1977).




                      THOMAS J. MOFFETT

                      Department of Physics
                      Purdue University
                      West Lafayette, IN 47907
                      U.S.A.


References:
Liller, W., 1977, Sky and Telescope, 53, 351  [BIBCODE 1977S&T....53..351L ]
Moffett, T.J., and Barnes, T.G., 1979, P.A.S.P., 91, 180 [BIBCODE 1979PASP...91..180M ]