COMMISSION 27 OF THE I.A.U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 1235

                                                    Konkoly Observatory
                                                    Budapest
                                                    1977 February 1


           PHOTOELECTRIC OBSERVATIONS OF UW CMa

BV photoelectric observations were carried out with the 20 cm
refractor at the Kanagawa Education Centre, Japan, on 68 nights
during the winters of 1973, 1974 and 1975.
   The photometer is furnished with the Hitachi 1P21 photomultiplier 
tube and Schott filters BG12+GG13 (for B) and GG14 (for V).
HD54669 (BD-23deg4949, Sp=B3V) was used as the comparison star
throughout the course of the observations and Johnson's standard 
stars were observed on each night.
   For the photometric reduction to the standard BV system the
following formulae were used:

       DeltaV = Delta v-k_v*Delta F(z)+epsilon*Delta(b-v),
   Delta(B-V) = mu[Delta(b-v)-k_bv*DeltaF(z)-k'_bv Delta[F(z)*(b-v)]].

   The photometric constants are epsilon = -0.111 and mu = 1.080 for
the observations from November 24 to December 16, 1974 and
epsilon = -0.144 and mu = 1.094 for the observations from December 20,
1874 to January 13, 1976. New light elements from the present
observations are

       Min.I = Hel. JD 2442424.014 + 4.39341 * E.

   It is interesting to note a strange hump at the phase 2.5 days
which can be seen on both light curves in B, V.


                               HITOSHI OGATA and CHIAKI HUKUSAKU

                               Kanagawa Education Centre
                               Fujisawa-city
                               Fujisawa 4210
                               Kanagawa, Japan



                        [FIGURE 1]