Long-term monitoring of active stars. VII. UBV(RI)_c photometry collected in March 1991
Abstract
In the framework of an extensive program focusing on the global properties and evolution of active stars, high-precision UBV(RI)_c photometry of 19 selected stars, collected at the European Southern Observatory over the 15-31 March 1991 interval is presented. Significant evolution of the light curves, period variations and evidence for long-term variability of the global degree of spottedness are found. Most of the spectral classifications are discussed. A flare event was detected for the star HD 127535 = V 841 Cen. These observations contribute to the establishment of a time-extended photometric database which can give important clues on topics such as the stability of spotted areas, differential rotation, solar-like cycles and the correlation between inhomogeneities at different atmospheric levels Figure 1 to 24 are only available on the on-line version of A&A at http://www.ed-phys.fr}. 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
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- January 1998
- DOI:
- 10.1051/aas:1998368
- Bibcode:
- 1998A&AS..127..207C
- Keywords:
-
- STARS: ACTIVITY;
- STARS: FLARE;
- STARS: LATE-TYPE;
- STARS: VARIABLES;
- TECHNIQUES: PHOTOMETRIC;
- STARS: HD 127535