Light curve variations of the RS CVn-type eclipsing binary ER Vulpeculae

Photoelectric observations of the double-lined spectroscopic and eclipsing binary ER Vul were obtained in B and V colours of Johnson's UBV system, between 1981 and 1986. The light curves show that the system is sometimes very active and sometimes very quiet and have changes in short time intervals. The were-like distortion, which is superimposed on the light curves, has been obtained. Moreover, small-amplitude light fluctuations in the light curves are noticeable. © 1990 Kluwer Academic Publishers