Intense X-ray flares from active stellar systems - EV Lacertae and HD 8357

Details Intense X-ray flares from active stellar systems - EV Lacertae and HD 8357 Intense X-ray flares from active stellar systems - EV Lacertae and HD 8357

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..270a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 270-277. NASA-Navy-supported research.

Astronomy and Astrophysics

Astronomy

23

Binary Stars, Light Curve, Stellar Flares, Stellar Luminosity, Stellar Systems, X Ray Sources, Heao 1, Sky Surveys (Astronomy), X Ray Astronomy

Scientific paper

X-ray light curves (0.5 - 20 keV), each approximately 1 week in duration, are presented for the dMe flare star, EV Lac, and the RS CVn binary system, HD 8357, based on data obtained with the A-1 Sky Survey experiment on HEAO 1. Four flares in all were seen, two from EV Lac and two from HD 8357. Variable low-level quiescent emission was also observed from both objects. These light curves represent the first unambiguous observations of more than one flare plus intervening quiescent X-ray emission from active stellar systems. Estimates of time averaged X-ray flaring luminosities show that for at least some epochs, up to an order of magnitude more energy is expended in X-ray flaring than in optical flaring.

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