Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..893s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. 893-898
Astronomy and Astrophysics
Astrophysics
5
A Stars, Absorption Spectra, Binary Stars, Giant Stars, Stellar Coronas, Stellar Envelopes, Stellar Temperature, X Ray Spectra, Carbon Isotopes, Silicon Isotopes, Spectrum Analysis, Temperature Distribution, X Ray Spectroscopy
Scientific paper
We present direct observational evidence for two different co-existing coronal temperature regimes in the sigma Aur-type binary HR 2554 (G7II + A1V). ROSAT observations reveal the presence of plasma at temperatures around 106.7 K, typical of coronal plasma found in giants, while IUE observations, taken during egress from eclipse, show circumstellar (CS) C IV and Si IV absorption lines in the spectrum of the secondary, which reveal a significant amount of geometrically extended (0 less than h less than 1R*) plasma in the temperature regime of about 105 K, similar to that found in HR 6902.
Huensch Matthias
Schroeder Klaus-Peter
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