1 Introduction

During the past two decades considerable attention has been focussed on RS CVn binaries and other chromospherically active stars. In order to investigate the physical characteristics of starspots, evolution of spotted regions as well as overall long-term cyclic variation, it is essential to perform systematic monitoring of active stars for long time spans. The photometric monitoring of the stars using small telescopes is economic and relatively easy to perform, therefore, it can provide an effective means of tracing out the evolution of starspots of the chromospherically active stars. Keeping this objective in mind we have started a systematic observing programme on RS CVn binaries, using the 0.35 m Celestron Schimdt-Cassegrain telescope at the University Observatory. In this paper we present new differential BVR photometry of six prominent, non-eclipsing RS CVn binary stars. The new data will be useful for studying the long-term behaviour of starspots.