COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 1560 Konkoly Observatory Budapest 1979 February 28 PHOTOELECTRIC OBSERVATIONS OF SZ PISCIUM The UBV photoelectric observations of SZ Piscium, which is known to be a member of close binaries of the RS CVn type, were secured with the 91-cm reflectors at the Dodaira Station of Tokyo Astronomical Observatory and at the Okayama Astrophysical Observatory on five nights in November and December 1977. HD 219018 was chosen for the comparison star, which is the same as used by Jakate et al., (1976). The observations are presented in Table I and also plotted in Figure 1. Phases in the second column of the table were calculated according to the linear ephemeris: t_E = Hel.J.D. 2442903.635+3.9655702d.E which are based on the times of observed primary minima due to Jakate et al., (1976) and Catalano et al., (1978). In the next three columns, we list the differential magnitudes and colour indices (the variable minus the comparison star) which have been corrected for differential atmospheric extinctions and transformed to the standard UBV system. It is known that SZ Psc shows a wave-like variation in its light curve, as has been pointed out by Eaton (1977). Although our observations have scantily covered phases outside the eclipses, they seem to confirm such a light variation of this system with an amplitude of at least 0.05 mag in V during our observational period. AKIRA OKAZAKI Department of Astronomy University of Tokyo Tokyo 113, Japan References; Catalano, S., Frisina, A., Rodono, M., and Scaltriti, F. 1978, I.B.V.S. No. 1427 Eaton, J.A., 1977, I.B.V.S. No. 1297 Jakate, B., Bakos, G.A., Fernie, J.D., Heard, J.F. 1976, Astron.J., 81, 250 [BIBCODE 1976AJ.....81..250J ] Table I ----------------------------------------------------- Hel.J.D. phase DeltaV Delta(U-B) Delta(B-V) 2443400+ ----------------------------------------------------- 71.975 0.3187 -0.491 0.260 0.208 71.985 0.3211 -0.470 0.198 0.208 71.994 0.3235 -0.491 0.251 0.194 72.004 0.3258 -0.466 0.192 0.229 72.014 0.3286 -0.464 0.213 0.203 72.024 0.3312 -0.469 0.219 0.220 72.033 0.3333 -0.448 0.200 0.197 72.042 0.3354 -0.464 0.221 0.196 72.050 0.3375 -0.454 0.201 0.190 72.058 0.3395 -0.478 0.226 0.214 83.019 0.1035 -0.372 0.221 0.203 83.028 0.1059 -0.349 0.204 0.186 83.035 0.1078 -0.371 0.198 0.198 96.898 0.6035 -0.424 0.190 0.210 96.905 0.6053 -0.422 0.184 0.207 96.912 0.6070 -0.424 0.201 0.207 96.920 0.6089 -0.432 0.192 0.211 96.926 0.6106 -0.432 0.210 0.203 96.933 0.6122 -0.426 0.205 0.203 96.939 0.6138 -0.430 0.205 0.200 96.945 0.6154 -0.434 0.203 0.207 96.953 0.6173 -0.444 0.204 0.214 96.959 0.6188 -0.436 0.214 0.206 96.965 0.6205 -0.435 0.203 0.203 96.972 0.6222 -0.400 0.205 0.204 96.978 0.6236 -0.439 0.201 0.208 96.984 0.6252 -0.441 0.207 0.205 96.991 0.6268 -0.448 0.195 0.213 96.997 0.6286 -0.439 0.193 0.211 97.006 0.6305 -0.432 0.194 0.196 97.904 0.8573 -0.470 0.206 0.208 97.911 0.8590 -0.468 0.200 0.208 97.918 0.8608 -0.472 0.202 0.214 97.924 0.8623 -0.478 0.205 0.211 97.931 0.8639 -0.477 0.214 0.216 97.937 0.8655 -0.471 0.217 0.207 97.944 0.8671 -0.466 0.208 0.210 97.950 0.8689 -0.466 0.211 0.209 97.959 0.8709 -0.477 0.209 0.210 97.972 0.8744 -0.469 0.212 0.201 97.980 0.8764 -0.463 0.227 0.203 97.986 0.8779 -0.455 0.212 0.214 97.992 0.8794 -0.457 0.187 0.211 97.999 0.8810 -0.464 0.189 0.218 98.954 0.1220 -0.382 0.180 0.203 98.961 0.1236 -0.381 0.183 0.212 98.969 0.1257 -0.386 0.197 0.196 98.977 0.1278 -0.379 0.163 0.200 ------------------------------------------------ [FIGURE 1]