Stellar coronae in the hyades : a soft X-ray survey with the EinsteinObservatory.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 1981
- DOI:
- 10.1086/159325
- Bibcode:
- 1981ApJ...249..647S
- Keywords:
-
- 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;
- Astronomy