Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as..102..655c&link_type=abstract
Astronomy and Astrophysics Supplement, Vol.102, NO.3/DECII, P. 655, 1993
Astronomy and Astrophysics
Astrophysics
23
Stars: Activity, Stars: Variables
Scientific paper
In the framework of a research program focusing on the global properties and evolution of photospheres and outer atmospheres of active stars, the author presents high-precision UBV(RI)c photometry of 14 selected RS CVn and BY Dra-type systems collected at the European Southern Observatory (La Silla, Chile) over the period January-March 1989. Significant evolution both of the amplitude and shape of the wave-like light curves and period variations are found with respect to previous observations. Evidence for long-term variability of most of the observed stars is also given and some of the spectral classifications are discussed. Besides establishing an extended database which can give important clues on topics such as the stability of spotted areas and associated magnetic structures, differential rotation and solar-like cycles, photometric observations are necessary to shed further light on the spatial and physical correlation between confined inhomogeneities at different atmospheric levels.
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