EUVE Coronal Spectroscopy of the RS CVn Binaries sigma (2) CrB and II Peg

Astronomy and Astrophysics – Astronomy

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Scientific paper

We have used the Extreme Ultraviolet Explorer satellite to study the coronal emission from the EUV-bright RS CVn binaries sigma (2) CrB, observed 1994 Feb 16-21, and II Peg, observed 1993 Oct 1-5. We present time-resolved and integrated EUV short, medium and long wavelength spectra for these binaries. sigma (2) CrB shows significant first-order emission features in the long wavelength region. The coronal emission measure distributions and electron densities are estimated for these active coronae dominated by high temperature (>= 10(7) K) plasma. This work is supported by NASA Grants NAG5-2259 & NAGW-2904 to the University of Colorado.

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