Long-term monitoring of active stars. IV. UBV(RI)_c_ observations obtained at La Silla in December 1989.

Details Long-term monitoring of active stars. IV. UBV(RI)_c_ observations obtained at La Silla in December 1989. Long-term monitoring of active stars. IV. UBV(RI)_c_ observations obtained at La Silla in December 1989.

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..111..507c&link_type=abstract

Astronomy and Astrophysics Supplement, v.111, p.507

Astronomy and Astrophysics

Astrophysics

36

Stars: Activity, Stars: Late-Type, Stars: Variables

Scientific paper

High-precision UBV(RI)_c_ photometry of 23 selected acitve stars, collected at the European Southern Observatory (La Silla, Chile) over the period 9-28 December 1989, is presented. This paper is part of a larger program focusing on the global properties and evolution of active stars and is aimed at establishing a time-extended database which can give important clues on topics such as the stability of the spotted areas, differential rotation and solar-like cycles. Significant evolution of the wave-like light curves, period variations and, in most cases, evidence for long-term variability of the global degree of spottedness are found for the observed stars. Some spectral classifications are rediscussed and evidence for a newly discovered variable star is given.

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