Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...95..397c&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 95, no. 3, p. 397-413.
Astronomy and Astrophysics
Astrophysics
26
Giant Stars, Stellar Activity, Stellar Spectrophotometry, Ubv Spectra, Light Curve, Stellar Atmospheres, Stellar Color, Stellar Evolution, Stellar Magnitude
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 15 selected RS CVn, BY Dra, and FK Com-type systems observed at the European Southern Observatory (La Silla, Chile) in the period January-March 1989. Significant evolution both in amplitude and shape of the wave-like light curves is found with respect to previous observations. Evidence for long-term variability for most of the observed stars is also presented, and some of the spectral classifications are rediscussed.
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