COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       Number 1104

                                   Konkoly Observatory
                                   Budapest
                                   1976 February 19


        FURTHER DETAILS ABOUT THE NEW ECLIPSING BINARY
               S 10796 = 71 DRACONIS


    In IBVS 1071 W. Furtig announced that the bright star 71 Dra
= HD 193 964 (B9V, m_v = 5.6) probably is an eclipsing binary. Hube
(1973) found a spectroscopic period of P = 5.298111d. With the aid
of this period W. Furtig observed another minimum on January 28/29,
1976 (comparison star HD 192 455). From these observations the 
following elements were found:

           Min. = JD 244 2806.415 + 5.2984d E

The light outside eclipse seems to be constant. No secondary 
minimum could be found (Fig. 1).

                        [FIGURE 1]

    One of us (L.M.) determined photometric elements according
to a method given by Irwin (1962). During the time of the observed
minimum 71 Dra was very near the horizon and the observations are
only of poor quality. Therefore the derived photometric elements
are only preliminary. The primary minimum is a transit. The following 
elements have been found:

       R = 1.75       phi_1 = 0.2688  i   = 86.85d
       k = 0.35       phi_2 = 0.3381  L_g = 1.00
       A = 0.015060     r_g = 0.157   x_g = 0.5
       B = 0.006115     r_s = 0.055     e = 0

    From these elements we can conclude that the invisible 
companion is a sun-like star. This is also in agreement with the
spectroscopic elements given by Hube (1973). In Fig. 2 the 
theoretical light curve and the observed points are plotted.
    We hope to get better observations and better elements in
summer.

                     [FIGURE 2]


                       W. FURTIG, L. MEINUNGER
                        Sonneberg Observatory
                  of Central Institute for Astrophysics
                    of Academy of Sciences of the GDR.


References:
Hube, P.   1973: The Spectrographic Orbit of HD 193964.
           JRAS Canada 67, 161.
Irwin, J.  1962: Orbit Determinations of Eclipsing Binaries.
           Stars and Stellar Systems Vol. II, 584. Chicago.