The corona of the G-type giant HR 2554: Discovery of co-existing, very different temperature regimes

Astronomy and Astrophysics – Astrophysics

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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.

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