Long-term monitoring of active stars. V. UBV(RI)_ c_ photometry collected in Feb.-Mar. 1990.
Abstract
High-precision UBV(RI)_c_ photometry of 12 selected active stars, collected at the European Southern Observatory (La Silla, Chile) over the period February - March 1990, is presented. Significant evolution of the light curves, period variations and, in most cases, evidence for long-term variability of the global degree of spottedness are found. Some of the spectral classifications are discussed. This paper is part of a more extensive program focusing on the global properties and evolution of active stars and is aimed at establishing a time-extended photometric database which can give important clues on topics such as the stability of the spotted areas, differential rotation and solar-like cycles.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- October 1996
- Bibcode:
- 1996A&AS..119..281C
- Keywords:
-
- STARS: ACTIVITY;
- STARS: LATE-TYPE;
- STARS: VARIABLES