The long-term evolution of chromospheric, transition-region, and starspot activity in the RS CVn system V711 Tauri

Details The long-term evolution of chromospheric, transition-region, and starspot activity in the RS CVn system V711 Tauri The long-term evolution of chromospheric, transition-region, and starspot activity in the RS CVn system V711 Tauri

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..201d&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 201-20

Astronomy and Astrophysics

Astrophysics

6

Binary Stars, Chromosphere, Starspots, Stellar Activity, Stellar Evolution, H Alpha Line, Iue, Stellar Luminosity, Stellar Spectra

Scientific paper

Using IUE spectra of the RS CVn binary V711 Tau from 1978 to 1984, the emission fluxes of the prominent chromospheric and transition-region lines are examined to trace the long-term development of active regions on the active component of the system. Optical observations reveal a systematic increase in the star's mean brightness, accompanied by an overall decrease in the chromospheric H-alpha emission, while the star becomes bluer. These changes could be related to a general decrease in the photospheric (spot) and chromospheric activity from 1978 to 1984. The UV emission-line fluxes from SWP low dispersion IUE spectra near the light curve extrema show a rise in emission from 1978 to a maximum in 1982 to 1983, followed by a sharper decline to reach the 1978 level by late 1984. Although the behavior of each of these aspects of the star appears to show systematic changes, the relationships among them are complicated.

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