Astron. Astrophys. Suppl. Ser.
Volume 127, Number 2, January II 1998
|Page(s)||207 - 215|
|Published online||15 January 1998|
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
Accepted: 5 May 1997
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.
Key words: stars: activity / stars: flare / stars: late-type / stars: variables / techniques: photometric / stars: HD 127535
Tables and the complete data set are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr or via http://cdsweb.u-strasbg.fr/Abstract.html
© European Southern Observatory (ESO), 1998