Long-term monitoring of active stars^*,**,***

VII. photometry collected in March 1991

Osservatorio Astrofisico di Catania, V.le A.Doria 6, I-95125 Catania, Italy

Send offprint request to: G. Cutispoto

Received: 21 April 1997
Accepted: 5 May 1997

Abstract

In the framework of an extensive program focusing on the global properties and evolution of active stars, high-precision photometry of 19 selected stars, collected at the European Southern Observatory over the 15-31 March 1991 interval is presented. Significant evolution of the light curves, period variations and evidence for long-term variability of the global degree of spottedness are found. Most of the spectral classifications are discussed. A flare event was detected for the star HD 127535 = V 841 Cen. These observations contribute to the establishment of a time-extended photometric database which can give important clues on topics such as the stability of spotted areas, differential rotation, solar-like cycles and the correlation between inhomogeneities at different atmospheric levels.