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

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

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234l.107k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Dec. 1, 1979, p. L107-L111. Research supported by the Miller In

Astronomy and Astrophysics

Astronomy

47

Flare Stars, Heao 1, Satellite Observation, X Ray Stars, Emission Spectra, Energy Spectra, Spaceborne Astronomy, Stellar Models, Stellar Spectra

Scientific paper

The paper reports 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 3 x 10 to the 7 K and an iron K-alpha emission line. The X-ray luminosities derived are in the range 1.3-16 x 10 to the 30th ergs/s, while emission measures are in the range 1.1-14 x 10 to the 53rd/cu cm. The estimated Lx/Lopt ratios exceed unity and are inconsistent with Mullan's flare model. Several scenarios to explain this discrepancy are proposed.

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