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EUVE Observations of AR Lacertae: The Differential Emission Measure and Evidence for Extended Prominences

Published online by Cambridge University Press:  12 April 2016

Frederick M. Walter
Frederick M. Walter*
Affiliation:
Department of Earth and Space Sciences, SUNY, Stony Brook, NY 11794-2100, USA

Abstract

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EUVE observed the eclipsing RS CVn system AR Lac in October 1993. The differential emission measure shows a double-peaked structure similar to the two-temperature distribution seen in X-rays. The best-fit Fe abundance is 0.4 solar. The DS light curve shows a deep primary eclipse. The slow egress from eclipse may be due the presence of spatially extended, optically-thick “prominences” in the equatorial plane of the K star.

Type
III. Coronae of Cool Stars
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 129 - 133
Copyright
Copyright © Kluwer 1996

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