Free Access
Astron. Astrophys. Suppl. Ser.
Volume 119, Number 2, October_II 1996
Page(s) 281 - 292
Published online 15 October 1996
Long-term monitoring of active stars. V. *** photometry collected in Feb.-Mar. 1990 DOI: 10.1051/aas:1996245

Astronomy and Astrophysics Supplement Series, Vol. 119, October II 1996, 281-292

Long-term monitoring of active stars. V. photometry collected in Feb.-Mar. 1990 gif

G. Cutispoto
Send offprint requests to: G. Cutispoto

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

Received February 5; accepted March 5, 1996


High-precision UBV(RI) photometry of 12 selected active stars, collected at the European Southern Observatory (La Silla, Chile) over the period February - March 1990, is presented. Significant evolution of the light curves, period variations and, in most cases, evidence for long-term variability of the global degree of spottedness are found. Some of the spectral classifications are discussed. This paper is part of a more extensive program focusing on the global properties and evolution of active stars and is aimed at establishing a time-extended photometric database which can give important clues on topics such as the stability of the spotted areas, differential rotation and solar-like cycles.

Key words: stars: activity --- stars: late-type --- stars: variables

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