COMMISSION 27 OF THE I.A.U.
               INFORMATION BULLETIN ON VARIABLE STARS
                           Number 2916

                                                    Konkoly Observatory
                                                    Budapest
                                                    14 July 1986

                                                    HU ISSN 0374 - 0676


        PHOTOELECTRIC MINIMA TIMES OF HD 197433 (VW CEPHEI)

The short period eclipsing binary HD 197433 (BD +75d752,
VW Cephei) is always in our observational programme because
of its peculiarities. Here, we are reporting the new minima
times coming out from our photoelectric observations of VW Cep
during 1984 and 1985.
   The observations were carried out with a two-beam,
multi-mode, nebular-stellar photometer attached to the 48-inch.
Cassegrain reflector at the Kryonerion Astronomical Station of
the National Observatory of Athens. The stars HD 192889 and
HD 192635 were used for comparison and checking, respectively.
The two intermediate pass bands of the filters used, B and V,
are in close accordance to the international system. Our results
are presented in the following Table the successive columns of
which give: the Hel. JD, the residuals (O-C)_I and (O-C)_II
and the type of minimum.


                            Table

 Hel. JD         (O-C)_I            (O-C)_II      Min
2440000.+         days               days         Type

5946.3996        -0.1463            +0.0412        I
5948.3428        -0.1508            +0.0361        I
5948.4762        -0.1307            +0.0304        II
6257.4104        -0.1558            +0.0294        II
6333.4046        -0.1423            +0.0423        II
6333.5527        -0.1334            +0.0513        I
6334.3658        -0.1556            +0.0194        I
6334.5027        -0.1578            +0.0271        II


  The minima times were calculated using Kwee and Van Woerden's
method (1956) and are the mean values of B and V observations;
while the differences (O-C)_I and (O-C)_II were found using
Kwee's (1966) and Kukarkin's et al. (1976) ephemeris formulae
respectively.


    P. ROVITHIS                 H. ROVITHIS-LIVANIOU
    Astronomical Institute      Section of Astrophysics -
    National Observatory of     Astronomy and Mechanics Dept.
    Athens, Athens 118 10 of    Physics, Athens University
    GREECE                      Athens - GREECE

    N. MATSOPOULOS
    Astronomical Institute
    National Observatory
    of Athens, Athens 118 10
    GREECE



References:

Kukarkin, B. V. et al.: 1976, Third Suppl. to the Third Edition of the General
 Catalogue of Variable Stars, Moscow. [BIBCODE 1976tstt.book.....K ]
Kwee, K. K.: 1966, Bull. Astron. Inst. Neth. 18, 448. [BIBCODE 1966BAN....18..448K ]
Kwee, K. K., Van Woerden, H.: 1956, Bull. Astron. Inst. Neth. 12, 327. [BIBCODE 1956BAN....12..327K ]