COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1823

                                   Konkoly Observatory
                                   Budapest
                                   1980 July 28

                                   HU ISSN 0374-0676


          PHOTOELECTRIC MINIMA OF AB ANDROMEDAE



  Photoelectric observations of the W Ursae Majoris-type
eclipsing binary, AB And, were carried out in April 1979. The
observations were made using the two-beam, multi-mode, nebularstellar 
photometer of the National Observatory of Athens attached 
to the 48-inch Cassegrain reflector at Kryonerion Astronomical
Station.
  The filters used, B and V are in close accordance to the
standard ones and reduction of the observations were made using
Hardie's (1962) method.
  During our observations 5 new minima (2 primaries and 3
secondaries) were observed. The following Table gives the Hel.
J.D. of these minima, the residuals (O-C) according to three
different ephemeris formulae ((O-C)_I Kukarkin's et al. (1969) ;
(O-C)_II Quester's (1967); (O-C)_III Rigterink's (1973)) and the
type of minimum.

           Table
Hel.J.D.   (O-C)I            (O-C)II              (O-C)III    Type
           days               days                   days      of
2444000+   (Kukarkin et al) (Quester)            (Rigterink)   Min.
136.3931   +0.0298          +0.0022               -0.0100       p.
136.5579   +0.0287          +0.0010               -0.0116       s.
137.3871   +0.0282          +0.0005               -0.0116       p.
137.5525   +0.0276          -0.0001               -0.0122       s.
138.5486   +0.0281          +0.0004               -0.0118       s.

The times of minima have been computed using Kwee and
Van Woerden's method (1956) and are the mean values from both
B and V observations.


     P. ROVITHIS                   H. ROVITHIS - LIVANIOU
   National Observatory of         Astronomy Department
   Athens, Athens (306)            Athens University
   Greece                          Panepistimiopolis
                                   Athens (601), Greece

References:
1) Hardie, R.H.: 1962, Stars and Stellar Systems Vol.II,
        Astronomical Techniques, ed. Hiltner, W.A., The University 
        of Chicago Press, Chicago
2) Kukarkin, B.V., et al. : 1969, Gen.Cat. of Var. Stars, Moscow [BIBCODE 1969gcvs.book.....K ]
3) Kwee, K.K. and Van Woerden, H. : 1956, Bull. Astr. Inst.
        Neth. 12, 327 [BIBCODE 1956BAN....12..327K ]
4) Quester, W. : 1967, I.B.V.S. No. 190
5) Rigterink, P.V.: 1973, Astron. Astrophys. Suppl. 12, 313 [BIBCODE 1973A&AS...12..313R ]