COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1533

                                 Konkoly Observatory
                                 Budapest
                                 1979 January 15





          BVRI OBSERVATIONS OF TWO IRREGULAR VARIABLES



  Observations on the Johnson BVRI system are reported for two irregular
variables, V509 Cas and FX Lib. The Purdue High Speed Photometer, described.
by Barnes et al. (1978), was used for the observations. The instrumental
system and reduction procedures are discussed by Moffett and Barnes (1979).
  Most of the observations were obtained on the 91-cm and 76-cm reflectors
at McDonald Observatory and a few were also made on the 61-cm reflector at the
Table Mountain Observatory and the No. 2, 91-cm telescope at Kitt Peak National
Observatory.
  The star, FX Lib, is classified as a gamma Cas variable in the GCVS. It is
a member of the Sco-Cen association and has a circumstellar envelope. The
star, V509 Cas, is a variable similar to rho Cas. The photoelectric observations 
of these two variables are given in Table I. The estimated uncertainties
for a single observation are: V = +-0.014, (B-V) = +-0.009, (V-R) = +-0.009,
and (R-I) = +-0.012.



THOMAS J. MOFFETT          THOMAS G. BARNES III
Department of Physics      McDonald Observatory
Purdue University          Department of Astronomy
West Lafayette, Indiana    47907 The University of Texas at Austin
                           Austin, Texas 78712




References;

Barnes, T.G., Evans, D.S., and Moffett, T. J., 1978, M.N.R.A.S., 183, 285. [BIBCODE 1978MNRAS.183..285B ]
Moffett, T.J., and Barnes, T.G., 1979, P.A.S.P., (in press). [BIBCODE 1979PASP...91..180M ]




                   TABLE I
                 V509 Cas   - BS8752
--------------------------------------------------
HJD                V        (B-V)    (V-R)   (R-I)
(2440000+)
--------------------------------------------------
       3367.00    4.873     1.590    1.171    .826
       3368.95    4.914     1.582    1.192    .833
       3371.00    4.869     1.574    1.182    .822
       3374.87    4.887     1.581    1.163    .831
       3377.00    4.874     1.592    1.175    .829
       3377.88    4.899     1.586    1.183    .839
       3393.85    4.904     1.583    1.195    .816
       3397.86    4.873     1.586    1.188    .791
       3398.85    4.885     1.583    1.186    .801
       3427.68    4.850     1.590    1.168    .802
       3495.60    4.854     1.567    1.208    .788
       3496.61    4.844     1.587    1.184    .810
       3508.56    4.893     1.595    1.222    .795

         FX Lib = BS5941

       3621.88    4.773     -.086    .003    -.101
       3626.82    4.799     -.093    .007    -.088
       3645.78    4.777     -.077    .005    -.104
       3662.80    4.779     -.080   -.012    -.083
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