Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264l..55s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 264, Jan. 15, 1983, p. L55-L59.
Astronomy and Astrophysics
Astronomy
37
Binary Stars, Heao 2, Late Stars, Stellar Flares, X Ray Sources, G Stars, K Stars, Luminosity, Proportional Counters, Spaceborne Astronomy, Stellar Atmospheres, Stellar Models
Scientific paper
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.
Antiochos Spiro K.
Stern Robert A.
Underwood James H.
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