COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 2307


                                   Konkoly Observatory
                                   Budapest
                                   8 April 1983

                                   HU ISSN 0374 - 0676





             1980 LIGHT CURVE OF II PEGASI



  The recent note by Byrne et al. (1983) prompts us to make available
our 1980 photometry of this important RS CVn binary.
  We observed II Pegasi differentially on 9 nights with the 24-inch at
Dyer and on 16 nights with the No. 4 16-inch at Kitt Peak. Our comparison
star was BD +28d4648, which is C-2 of Byrne et al. This comparison star
and the variable are almost identical in B-V color. The nightly means (of
3 individual differential magnitudes in V of the UBV system) are listed
chronologically in Table I, where the first 4 and last 5 are from Dyer.




                 Table I

Differential V photometry of II Pegasi in 1980
------------------------------------
 JD(hel.)  DeltaV  JD(hel.)   DeltaV
 2444000+          2444000+
------------------------------------
458.892   -1.895   505.739   -1.934
459.865   -1.902   506.749   -1.873
474.846   -1.873   509.837   -1.770
483.763   -1.787   510.838   -1.817
496.896   -1.780   511.735   -1.910
497.746   -1.840   512.735   -1.934
498.780   -1.915   513.733   -1.862
499.739   -1.906   526.755   -1.899
500.884   -1.865   535.900   -1.840
501.747   -1.855   549.966   -1.808
502.745   -1.786   554.702   -1.833
503.756   -1.785   555.860   -1.834
504.856   -1.881
------------------------------------

                         [FIGURE 1]

   The 16 nightly means from Kitt Peak are plotted in the Figure, where
phase is computed with the ephemeris

            JD = 2443030.24 + 6.724183d E.

Because the light curve of II Peg changes shape so rapidly, the Dyer 
observations (obtained over a 100-day interval) defined the light curve less
well and are not plotted.
   We are grateful to NASA for the support provided by research grant
NSG-7543.


               DOUGLAS S. HALL ^a
               GREGORY W. HENRY ^ab

               Dyer Observatory
               Vanderbilt University
               Nashville, Tennessee 37235

Reference:

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.

a) Guest Observer at Kitt Peak National Observatory, which is operated by
   the Association of Universities for Research in Astronomy, under con-
   tract with the National Science Foundation.
b) Now at McDonald Observatory, Fort Davis, Texas.