Examination of Orbital Period of ZZ Cancri

Abstract

A total of 266 photoeletric observation(91 in V, 93 in B, and 82 in U) for an eclipsing binary, ZZ Cnc, has been secured by using the 61-cm reflector and an uncooled 1P21 photomultiplier phototube of Yonsei University Observatory during 4 years from March 1984 to May 1988. One time of minimum light, JD 2446887.534 is obtained. Although Kim et al.(1988) suggested the possibility of the period of ZZ Cnc should be constant. According to a reasonable interpretation of the eclipse light curves, Min I = JD Hel 2446887.574(±2) +25.d5944(±2) E may be useful as new light elements for future observations.