COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1597

                                Konkoly Observatory
                                Budapest
                                1979 May 3



              A B LIGHT CURVE OF SZ Lyn


  The RR_s star SZ Lyn was observed on 29/30 March 1977 with the
75 cm telescope of the Wilhelm Foerster Observatory, Berlin. A
single channel photometer with an uncooled 1P21 multiplier and
Schott filters BG12 + GG13 (=B) and a conventional amplifier were
used. BD +44d1716 served as a comparison star. A total of 93 B
observations were obtained. The time of maximum light was determined 
by Pogson's method:

  E=42378 tmax(J.D.hel)=2443 232.4309d +- 0.0008d

  O-C_1 = +0.0090d , O-C_2 = +0.0100d , O-C_3, = +0.0086d .

                          [FIGURE 1]

The value of O-C_1 is calculated with the linear ephemeris and
O-C_2 with the sinusoidal ephemeris of Barnes and Moffett (1975).
The value of O-C_3 is calculated with the sinusoidal  ephemeris
of van Genderen (1963). These O-C values are so large that they
can not be explained by observational error. Thus the ephemeris
should be revised. In the light curve one finds unusual great
scatter around 0.65P and a hump of about 0.06m at 0.12P.




                     U. HOPP, S. WITZIGMANN
                   Wilhelm Foerster Observatory
                       Munsterdamm 90
                      D-1000, Berlin - 41




References:

Barnes III, Th.G., Moffett, Th.J. 1975, Astr.J., 80, 48 [BIBCODE 1975AJ.....80...48B ]
van Genderen, A.M. 1963, Bull. Astr. Inst. Netherl., 17, 243 [BIBCODE 1963BAN....17..243V ]