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A&A Supplement series, Vol. 127, January II 1998, 207-215

Received April 21; accepted May 5, 1997

Long-term monitoring of active stars

VII. tex2html_wrap_inline2405 photometry collected in March 1991gif,gif

G. Cutispoto

Send offprint request: G. Cutispoto
Osservatorio Astrofisico di Catania, V.le A.Doria 6, I-95125 Catania, Italy


In the framework of an extensive program focusing on the global properties and evolution of active stars, high-precision tex2html_wrap_inline2405 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 levelsgif.

keywords: stars: activity -- stars: flare -- stars: late-type -- stars: variables -- techniques: photometric -- stars: HD 127535

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