Detection of X-ray emission from stellar coronae with ANS

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Netherlands Satellite, Spaceborne Astronomy, Stellar Radiation, X Ray Astronomy, X Ray Stars, Binary Stars, Giant Stars, Main Sequence Stars, Stellar Mass Ejection, Supergiant Stars, Ultraviolet Radiation

Scientific paper

The soft X-ray detector aboard the Astronomical Netherlands Satellite (ANS) has been used to search for soft X-ray emission in the range 0.2 to 0.284 keV from hot stellar coronae. X-ray emission has been detected from Capella (alpha Aur) and Sirius (alpha CMa). For 26 other stars (main sequence, subgiants, giants, and supergiants) upper limits to the X-ray luminosity have been obtained. The physical conditions of a corona needed to explain the observations are discussed.

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