COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 2308


                                    Konkoly Observatory
                                    Budapest
                                    8 April 1983

                                    HU ISSN 0374 - 0676



             1981 LIGHT CURVE OF II PEGASI



   A recent note by Byrne et al. (1983) prompts us to make available our
1981 photometry of the interesting RS CVn binary II Pegasi.
   We observed II Peg differentially in 1981, using BD +28d4648 as our
comparison star, which is C-2 of Byrne et al. This comparison star and the
variable are almost identical in B-V color. Lines observed on 25 nights
with his 20-inch, Louth observed on one night with his 11-inch, and Stelzer
observed on one night with his 14-inch. The nightly means (of the 2-to-7
individual differential magnitudes in V of the UBV system) are listed in
Table I, where the last two are by Louth and Stelzer, respectively.



                Table I

Differential V photometry of II Pegasi in 1981
----------------------------------
JD(hel.)  DeltaV  JD(hel.)  DeltaV
2444000+          2444000+
----------------------------------
846.86   -1.929   897.71   -1.741
849.88   -1.782   898.71   -1.747
858.84   -1.793   899.70   -1.842
859.83   -1.902   900.69   -1.940
867.85   -1.940   901.69   -1.954
868.86   -1.915   903.68   -1.821
875.77   -1.911   908.66   -1.948
876.76   -1.820   909.67   -1.921
881.75   -1.934   910.71   -1.798
883.71   -1.794   911.67   -1.743
884.78   -1.725   928.65   -1.943
885.74   -1.783   889.75   -1.839
886.73   -1.930   921.65   -1.992
887.72   -1.939
----------------------------------

                          [FIGURE 1]

   All 27 nightly means are plotted in the Figure, where phase is 
computed with the ephemeris

             JD 2443030.24 + 6.724183d E.

This light curve differs dramatically from the one just one year before.
The 1980 light curve of Hall and Henry (1983) had two distinct minima
whereas this 1981 light curve has only one minimum.


               RICHARD D. LINES
               6030 North 17th Place
               Phoenix, Arizona 85016

               HOWARD LOUTH
               2199 Hathaway Road
               Sedro Woolley, Washington 98384

               HAROLD J. STELZER
               1223 Ashland Avenue
               River Forrest, Illinois 60305
          
               DOUGLAS S. HALL
               Dyer Observatory
               Vanderbilt University
               Nashville. Tennessee 37235


References:

Byrne, P. B., Butler, C. J., Andrews, A. D., Rodono, M., Catalano, S.,
   Pazzani, V., Linsky, J. L., Bornman, P., and Haisch, B. M. 1983,
   I.B.V.S. No. 2258.
Hall, D. S. and Henry, G. W. 1983, I.B.V.S. No. 2307