A giant X-ray flare in the Hyades.
Abstract
The authors have observed a giant stellar flare in the Hyades binary HD 27130 = VB 22 = BD +16°577 with the Einstein Observatory. The peak X-ray luminosity of the flare is greater than 1031erg s-1, at least several thousand times brighter than the most intense solar flares. The ratio of flare peak to quiescent X-ray luminosity is ≡35. HD 27130, first detected as an X-ray source in the central Hyades survey of Stern et al., recently has been determined to be a double-lined eclipsing binary with a period of 5.6 days. The primary is a G dwarf, and the secondary is a K dwarf. The temperature estimated for the flare (≡4×107K) and the form of the flare decay suggest that it is solar-like. It is suggested that giant flares may be typical of young or rapidly rotating systems.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1983
- DOI:
- 10.1086/183943
- Bibcode:
- 1983ApJ...264L..55S
- Keywords:
-
- Binary Stars;
- Heao 2;
- Late Stars;
- Stellar Flares;
- X Ray Sources;
- G Stars;
- K Stars;
- Luminosity;
- Proportional Counters;
- Spaceborne Astronomy;
- Stellar Atmospheres;
- Stellar Models;
- Astrophysics