Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263...53s&link_type=abstract
In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 53-56
Astronomy and Astrophysics
Astrophysics
1
Late Stars, Stellar Activity, Stellar Rotation, Chromosphere, Iue, Stellar Evolution, Ultraviolet Spectra
Scientific paper
Activity in active chromosphere stars, many of which are single-line RS CVn binaries whose strong UV chromospheric emission lines were observed with IUE is discussed. The UV emission of active chromosphere stars as an undifferentiated class decreases in strength with declining rotation rate, but there is little or no dependence of emission upon rotation for stars within individual luminosity classes. The enhanced activity of the evolved RS CVn binaries is not inconsistent with theoretical predictions of a decrease in the Rossby number NR during evolution away from the main sequence, but there is no direct support for an empirical Rossby-type rotation-activity relation for these stars as found for dwarfs. The short rotation periods of such active stars may place them in a regime of small NR where changes in the pattern of convective motions alter the efficiency of the dynamo and where surface activity depends only weakly, discontinuously, or stochastically on NR.
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