COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 2317

                                    Konkoly Observatory
                                    Budapest
                                    20 April 1983

                                    HU ISSN 0374-0676


     
     PHOTOELECTRIC MINIMA TIMES OF THE ECLIPSING BINARY V 508 OPHIUCHI


  Photoelectric observations of the eclipsing variable star V508 Oph were
carried out during 1981. The observations were made using the two-beam, 
multi-mode, nebular-stellar photometer attached to the 48-inch Cassegrain 
reflector at Kryonerion Astronomical Station of the National Observatory of
Athens.
  Reduction of the observations was made in the usual way (Hardie, 1962) and
the B and V filters used are in close accordance to the standard ones.
  From our observations three primary and three secondary minima times have
been derived using Kwee and Van Woerden's method (1956). They are given in
the following Table, the successive columns of which give: the Hel. J.D., the
residuals O-C and the type of minimum. The O-C values were calculation
Kukarkin's et al. (1976) ephemeris formula:

       Min.Hel.J.D. = 2428416.339 + 0.34479163d E



            Table
----------------------------
Hel. J.D.      O-C     Min.
2444000+       days    Type
----------------------------
783.4265     +0.0012   II
784.4623     +0.0026   II
785.3283     +0.0067   I
785.4958     +0.0018   II
786.3623     +0.0063   I
864.2816     +0.0066   I
----------------------------




P. ROVITHIS               H. ROVITHIS-LIVANIOU
National Observatory      Astronomy Department
of Athens, Athens (306)   Athens University
Greece                    Panepistimiopolis
                          Athens (621), Greece


References:

Hardie, R.H.: 1962, Stars and Stellar Systems, Vol. II, "Astronomical 
   Techniques" (Ed.: Hiltner, W.A.), The University of Chicago Press, 
   Chicago, p. 178.
Kukarkin, B.V. et al.: 1976, General Catalogue of Variable Stars, Moscow.
Kwee, K.K. and Van Woerden, H.: 1956, Bull. Astron. Inst. Neth., 12, 327. [BIBCODE 1956BAN....12..327K ]