HEAO 1 observations of X-ray emission from flares on dMe stars

We report the detection of two X-ray flares from each of the nearby dMe stars, AT Mic and AD Leo, with the A-2 experiment on board HEAO 1. A spectrum obtained during the brighter At Mic flare, the first X-ray spectrum of a stellar flare, is well matched by a thermal model with a temperature approx.3...

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Veröffentlicht in:	Astrophys. J., Lett. Ed.; (United States) Lett. Ed.; (United States), 1979-12, Vol.234, p.L107
Hauptverfasser:	Kahn, S. M., Mason, K. O., Bowyer, C. S., Linsky, J. L., Haisch, B. M., White, N. E., Pravdo, S. H.
Format:	Artikel
Sprache:	eng
Schlagworte:	640103 - Astrophysics & Cosmology- Quasi-Stellar, Radio, & X-Ray Sources- (-1987) CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COSMIC RAY SOURCES COSMIC X-RAY SOURCES ELECTRON DENSITY LUMINOSITY OPTICAL PROPERTIES PHYSICAL PROPERTIES PLASMA SPECTRA STELLAR FLARES X-RAY SPECTRA
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Zusammenfassung:	We report the detection of two X-ray flares from each of the nearby dMe stars, AT Mic and AD Leo, with the A-2 experiment on board HEAO 1. A spectrum obtained during the brighter At Mic flare, the first X-ray spectrum of a stellar flare, is well matched by a thermal model with a temperature approx.3 x 10/sup 7/ K and an iron K..cap alpha.. emissiom line. The X-ray luminosities derived are in the range 1.3--16 x 10/sup 30/ ergs s/sup -1/, while emission measures are in the range 1.1--14 x 10/sup 53/ cm/sup -3/. The estimated L/sub z//L/sub opt/ ratios exceed unity and are inconsistent with Mullan's flare model. We propose several scenarious to explain this discrepancy.
ISSN:	0004-637X 1538-4357
DOI:	10.1086/183119