Long-term monitoring of active stars. II. UBV (RI)c observations at ESO during January-March 1989.
Abstract
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.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- November 1992
- Bibcode:
- 1992A&AS...95..397C
- Keywords:
-
- Giant Stars;
- Stellar Activity;
- Stellar Spectrophotometry;
- Ubv Spectra;
- Light Curve;
- Stellar Atmospheres;
- Stellar Color;
- Stellar Evolution;
- Stellar Magnitude;
- Astrophysics