COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       Number 2563

                                        Konkoly Observatory
                                        Budapest
                                        26 July 1984

                                        HU ISSN 0374-0676


       1983-1984 PHOTOMETRY OF THREE SEMI-REGULAR VARIABLES


   The Automatic Photoelectric Telescope at Fairborn Observatory West in
Phoenix, Arizona has been used to obtain UBV photometry of six semi-regular
variables on the AAVSO Photoelectric Photometry Program. In this paper we
present V-band results for the three with the most complete coverage.
   The Automatic Photoelectric Telescope used to make the observations
has been described by Boyd, Genet, and Hall (1984a). The complete set of
data in all three bandpasses of the UBV system has been sent to the I.A.U.
Commission 27 Archive for Unpublished Observations of Variable Stars (Breger
1982) where it is available as File No. 131 (1983) and File No. 136 (1984).
   Shown in Figures 1, 2, and 3 are the V-band light curves for rho Per,
CE Tau, and FS Com, respectively. The data were corrected for differential
extinction and transformed differentially to the standard UBV system. The
coefficients used in the reduction procedure have been given by Boyd, Genet,
and Hall (1984b). The ordinates are the differential magnitudes between
the variable and comparison stars, while the abscissas are the Julian dates
(plus 2445000). The comparison and check stars observed are shown in
Table I. The differential magnitudes between the comparison and check stars
were found not to vary significantly.


                             [FIGURE 1]

 Figure 1   1983-1984 photoelectric light curve of rho Persei in V

                             [FIGURE 2]

 Figure 2   1983-1984 photoelectric light curve of CE Tauri in V

                             [FIGURE 3]

 Figure 3   1983-1984 photoelectric light curve of FS Comae in V



                 Table I

     Variable, Comparison, and Check Stars

Variable                  Comparison      Check


rho Per = HD 19058       HD 19656         HD 18339

CE Tau = HD 36389        HD 35802         HD 35296

FS Com = HD 113866       HD 113848        HD 114724

   We wish to thank John R. Percy at the David Dunlap Observatory for
providing detailed information on the variable, comparison, and check stars.
We also wish to thank Michael M. Genet for plotting the light curves.



               LOUIS J. BOYD
               Fairborn Observatory West
               629 North 30th Street
               Phoenix, Arizona 85008

               RUSSELL M. GENET
               Fairborn Observatory East
               1247 Folk Road
               Fairborn, Ohio 45324

               DOUGLAS S. HALL
               Dyer Observatory
               Vanderbilt University
               Nashville, Tennessee 37235

References:

Breger, M. 1982, I.B.V.S. No. 2246.
Boyd, L. J., Genet, R. M., and Hall, D. S. 1984a, I.A.P.P.P. Communication
   No. 15, 20.
Boyd, L. J., Genet, R. M., and Hall, D. S. 1984b, I.B.V.S. No. 2511.


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