COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 2108

                                 Konkoly Observatory
                                 Budapest
                                 1982 March 15

                                 HU ISSN 0374-0676


        PHOTOELECTRIC OBSERVATIONS OF VW CEPHEI




   The eclipsing binary star of the W UMa type, VW Cep,
was observed photoelectrically with the 30-cm reflector at
the Mitaka campus of the Tokyo Astronomical Observatory
during the nights of December 2, 3, 16 and 17, 1981. The
photometer was furnished with an uncooled 1P21 photomultiplier
tube and U, B, V filters in close accordance with the standard
ones of Johnson. Actual observations were made with the
B and V filters only, against the comparison star HD 192635
(Sp=F5). Altogether, 139 observations in V and 143 in B
were obtained and they are plotted in Figure 1, where the
phases are calculated with

     Prim.Min. = JD Hel 2443448.2663 + 0.2783176d E


which has been taken from the work of Niarchos (1980).

                    [FIGURE 1]

   The present observations cover 4 primary minima and 3
secondary. The following table gives their heliocentric
times with the O-C values from the above ephemeris.

       Observed date        O - C      Type of minimum

   Hel.JD 2444000+ 

          941.1435        - 0.0180d      Prim.
          941.9806        - 0.0163       Prim.
          942.1181        - 0.0179       Sec.
          954.9207        - 0.0179       Sec.
          955.0581        - 0.0197       Prim.
          955.8936        - 0.0191       Prim.
          956.0337        - 0.0182       Sec.





From these O-C values, it is found that no appreciable period
change has occurred since 1976 (Pohl et al. 1977). All the
observational data given in m_v- m_c are not published here, but
are available on request.



    I would like to express my hearty thanks to Prof. M.
Kitamura of Tokyo Astronomical Observatory for his suggestion
of this programme and kind guidance on the work. My sincere
gratitude is also due to the entire staff of the photometric
section of the Observatory for its kindness and hospitality
during my six-month stay. Thanks are also extended to Drs.
A. Yamasaki and A. Okazaki for their kind discussion on 
photoelectric reduction.





                TADASHI ABE
                Nuttari High School
                4-1 Higashi Bandai
                Niigata-City, 950 Japan





References:
Rovithis, P., Rovithis-Livaniou, H., 1980, Astrophys.Sp.Sci., 73, 27. [BIBCODE 1980Ap&SS..73...27R ]
Niarchos, P.G., 1980, I.B.V.S. No. 1729. 
 [Original: No. 1980]
Hopp, U., Witzigmann, S., Kiehl, M., 1976, I.B.V.S. No. 1599.
Cristescu, C., 1978, I.B.V.S. No. 1383.
Pohl, E., Kizilirmak, A., 1977, I.B.V.S. No. 1358.