Einstein observations of X-ray emission from variable stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Spaceborne Astronomy, Stellar Radiation, Variable Stars, X Ray Sources, B Stars, Flare Stars, H Ii Regions, Late Stars, Main Sequence Stars, Molecular Clouds, O Stars, T Tauri Stars, Wolf-Rayet Stars

Scientific paper

Planned observations and preliminary results of recent observations of the X-ray emission from variable stars made by the Einstein Observatory are reviewed. The cataclysmic variables detected in the X-ray by Einstein, which has a sensitivity three orders of magnitude greater than previous instruments, are indicated, together with detections of Orion and other pre-main sequence stars within nebulae, including T Tauri stars. Observations of high X-ray luminosities from OB stars, Wolf-Rayet stars and searches for X-ray emission in the regions of molecular clouds, H II regions and COS-B gamma ray sources are considered, and X-ray emission detected from late-type main sequence stars is then discussed, with particular attention given to RS CVn-type and dwarf M and UV Ceti/flare stars. Conclusions that may be derived from the observations concerning the prevalence of X-ray emission from stars of practically all spectral types and luminosity classes are summarized.

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