Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...9909944s&link_type=abstract
Technical Report, GBS-98-203 Solar and Astrophysics Lab.
Astronomy and Astrophysics
Astrophysics
Coronas, Eclipsing Binary Stars, Extreme Ultraviolet Radiation, Sun, X Rays, Rosat Mission, Extreme Ultraviolet Explorer Satellite, Contractors, Variability
Scientific paper
The contractor describes EUVE and ROSAT observations of the Hyades K0 III giants theta(sup 1(vB 71 = HR 1411) and gamma (vB 28 = HR 1346) Tau, and ASCA observations of theta(sup 1) Tau. The coronal activity of these "clump" giants is intermediate between that of the Sun and of high-activity stars such as RS CVn systems. There is no evidence for significant short or long term variability up to several years. Modeling of the individual and combined spectra suggest that these two X-ray and EUV- bright Hyades giants resemble in their activity levels another clump giant, beta Cet, with a peak in the emission measure distribution near log T approx. 6.8, reminiscent of the Capella emission measure "bump."
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