COMMISSIONS 27 AND 42 OF THE IAU 
              INFORMATION BULLETIN ON VARIABLE STARS 
                           Number 3754 
 
                                          Konkoly Observatory 
                                          Budapest 
                                          22 July 1992 
 
                                          HU ISSN 0374 - 0676 
 
 
 
            UBVR PHOTOMETRY OF THE FAINT ECLIPSING BINARY 
                              HS PERSEI 
 
 
 The eclipsing binary HS Per (= S3892; m = 13.0-15.9 pg) was 
discovered to be a variable by Gotz (1956).  The period of the system 
was uncertain.  The star is of A0II-III type (Halbedel, 1984).  It is 
a probable member of the Perseus spiral arm (Zakirov, 1990). 
 
 HS Per was observed with the 60 cm telescope during 1988/90 on Mt. 
Maidanak in the South of Uzbekistan.  As a comparison the star BD 
+56d369 (V = 9.867m; U-B = +0.04m; B-V = 0.482m; V-R = 0.512m) was 
chosen (denoted with s in Figure 1).  The control star (V = 10.849m; 
U-B = -0.295m; B-V= 0.070m; V-R = 0.088m) is shown in Figure 1 as 
star c. 184 measurements in U, 399 in B, 402 in V, 379 in R were 
carried out.  According to our estimation the probable error of a 
single observation of HS Per is 0.015m in V; for U-B = 0.020m; for 
B-V = 0.015m and for V-R = 0.025m at the maximum.  They are about 
twice more at the primary minimum. 
 
 The results of our observations are presented in Figure 2 as light 
and color curves.  We have calculated the following ephemeris, using 
both our and Gotz's data of the minima too. 
 
               Min I = JDH 2447448.267 + 2.836782d x E 


                             [FIGURE 1]

                 Figure 1. Finding chart of HS Persei

                             [FIGURE 2]

                 Figure 2. Light and colour curves of HS Per

 
 The photometric characteristics are given in Table I. 
 
                               Table I. 
 
                           V     U-B    B-V    V-R 
                 Max     12.28   0.18   0.32   0.28 
                 Min I   14.88   0.35   0.87   0.93 
                 Min II  12.32   0.18   0.30   0.23 
 
 
 
               MAMNUN M. ZAKIROV and ALIBEK A. AZIMOV 
               Ulugh Beg Astronomical Institute 
               Astronomicheskaya, 33, Tashkent 
               700052, Uzbekistan 
 
 
References: 
 
Gotz, W.: 1956, VSS 2, N5. 
 
Halbedel, E.M.: 1984, IBVS, No. 2550. 
 
Zakirov, M.M.:  1990, Kinematika Fiz.  Nebesn.  Tel., T6, N3, 18. [BIBCODE 1990KFNT....6...18Z ]