COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1515

                                  Konkoly Observatory
                                  Budapest
                                  1978 December 18




           MAXIMUM TIMES OF BW VULPECULAE


    The beta Canis Majoris type variable BW Vul (HD 199140,
M_V = -4.35m, B2 III) was observed photoelectrically at EGE University
Observatory during the summer of 1977 and 1978. The observations
were obtained with the 48 cm Cassegrain telescope equipped with
an unrefrigerated 1P21 photomultiplier. HD 198820 was used as
the comparison star.
    While the observations in 1977 were obtained in uvby system
those in 1978 were secured in UBV system. The observations in
(u) and (U) colours were used for the maximum times.
    Four maximum times were obtained in 1977 and used for 
recalculation of the period of BW Vul. The new light element is
given by Tunca (1978) as:

       Max.J.D.hel = 2441537.7724 + 0.20104071d E.

    All maximum times and the (O-C) values obtained with the
help of the equation above are given in the following table.


----------------------------------
J.D. hel.           E       (O-C)
----------------------------------
2443371.4660       9121    0.0014d
    382.3215       9175     .0007
    385.3328       9190    -.0036
    422.3297       9374     .0018
    745.3959       10981   -.0044
    750.4264       11006    .0001 
    753.4416       11021   -.0004
    764.2976       11075   -.0006
    770.3275       11105   -.0019
    776.3590       11135   -.0016
----------------------------------


                       Z. TUNCA
                       EGE University Observatory
                       Izmir, Turkey



Reference:

Tunca, Z., 1978. I.B.V.S. No. 1386