SIMBAD references

1994A&A...289..893S - Astronomy and Astrophysics, volume 289893-898 (1994/9-3)

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

SCHROEDER K.-P. and HUENSCH M.

Abstract (from CDS):

We present direct observational evidence for two different co-existing coronal temperature regimes in the ζ Aur-type binary HR 2554 (G7II + A1V). ROSAT observations reveal the presence of plasma at temperatures around 106.7K, 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<h<1R*) plasma in the temperature regime of about 105K, similar to that found in HR 6902.

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Journal keyword(s): stars: binaries: eclipsing - stars: binaries: spectroscopic - stars: chromospheres - stars: coronae - stars: individual: HR 2554

Simbad objects: 7

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