COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 2682

                                    Konkoly Observatory
                                    Budapest
                                    11 March 1985

                                    HU ISSN 0374 - 0676

                  LIGHT CURVE OF BV Dra


  BV Dra, the brighter member of the interesting visual binary system ADS
9537, is an eclipsing binary of W UMa type.
  Yamasaki (1979) observed the star in UBV between March 20, 1976 - May 16,
1977 and found some scatter in the composed light curve. He claimed that the
origin of this scatter would be either the real scatter of the individual light
curves or the hazy sky.
  Geyer et al. (1982) did not report any light curve changes in the course
of their UBV observations performed between 1976-1980. Their observed light
curve was symmetrical.
  Between August 1980 - May 1981 Rovithis and Rovithis-Livaniou (1982) made
B and V observations of this star and found some scatter in the V light curve
only.
  BV Dra was observed in UBV colors on 3 nights (May 31, June 5, 8) in 1984
at Kottamia Observatory of the Helwan Institute for Astronomy and Geophysics.
As comparison star BD + 61d1495 was chosen, its brightness and colors can be
found in Table I of Geyer et al. (1981). The light curve is shown in the
Figure. The magnitudes have been given in the instrumental system and the

                              [FIGURE 1]

phases have been computed using Yamasaki's (1979) elements:

            phase = J.D. hel. 2442858.06867 + 0.35006571 E

  One primary and one secondary minimum was obtained:

            Min.I.: J.D. hel. 2445860.2392
            Min.II.: J.D. hel. 2445857,2622

In the light curve between the phase 0.6-0.7 an interesting hump appeared
(see the Figure). The amplitudes (A) of the hump in the light curves are 
different: A(Delta u)>A(Delta b)>A(Delta v).





                         M. HAMDY
                         N.S. AWADALLA
                         A.B. MORCOS
                         Helwan Institute for Astronomy
                         and Geophysics, Helwan, Egypt





References;

Geyer, E.H., Hoffmann, M., Karimie, M.T., 1982, Astron.Astrophys. Suppl. 48, 85. [BIBCODE 1982A&AS...48...85G ]
Rovithis, P., Rovithis-Livaniou, H., 1982, Ap.Sp.Sci., 82, 229. [BIBCODE 1982Ap&SS..82..229R ]
Yamasaki., A., 1979, Ap.Sp.Sci., 60, 173. [BIBCODE 1979Ap&SS..60..173Y ]