Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..121..369c&link_type=abstract
A & A Supplement series, Vol. 121, February 1997, 369-378
Astronomy and Astrophysics
Astronomy
13
Stars: Activity, Stars: Late-Type, Stars: Variables
Scientific paper
In the framework of an extensive program focusing on the global properties and evolution of active stars, high-precision UBV(RI)_c photometry of 9 selected stars, collected at the European Southern Observatory over the intervals 7-17 September and 30 September - 10 October 1990, is presented. Significant evolution of the light curves, period variations and evidence for long-term variability of the global degree of spottedness are found. Some of the spectral classifications are discussed. These observations contribute to the establishment of a time-extended photometric database which can give important clues on topics such as the stability of the spotted areas, differential rotation, solar-like cycles and the correlation between inhomogeneities at different atmospheric levels. Based on data collected at the European Southern Observatory, La Silla, Chile. 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
Cutispoto Giuseppe
Leto Giuseppe
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