Stellar coronae in the Hyades - A soft X-ray survey with the Einstein Observatory

Astronomy and Astrophysics – Astronomy

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Heao 2, Spaceborne Astronomy, Star Clusters, Stellar Coronas, Stellar Radiation, X Ray Sources, Astronomical Catalogs, Dwarf Stars, Giant Stars, Main Sequence Stars, Scaling Laws, Stellar Luminosity, Stellar Rotation, Stellar Temperature, White Dwarf Stars, X Ray Astronomy

Scientific paper

An X-ray survey of the central region of the Hyades cluster demonstrates that soft X-ray emission is a common property of the stars in the cluster. Half of the 85 stars surveyed are detected above a sensitivity threshold of 10 to the 28.5th ergs/s at the Hyades distance of 45 pc. The high incidence of X-ray emission and range of observed X-ray luminosities indicate that stellar coronas produce the observed X-ray emission, with a typical X-ray luminosity for solar-type Hyades of 10 to the 29th ergs/s. The use of coronal scaling laws is found to yield reasonable values of maximum coronal temperatures and the fraction of stellar surface covered for the Hyades coronas.

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