H-alpha versus X-ray luminosity in dwarf M stars

Details H-alpha versus X-ray luminosity in dwarf M stars H-alpha versus X-ray luminosity in dwarf M stars

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...218..195d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 195-198.

Astronomy and Astrophysics

Astrophysics

17

Dwarf Stars, H Alpha Line, M Stars, Stellar Luminosity, X Ray Stars, Absorption Spectra, Chromosphere, Late Stars, Stellar Coronas

Scientific paper

A power-law correlation is presented between the excess chromospheric H-alpha emission and the coronal X-ray emission for a group of dM and dMe stars. This excess emission was calculated by subtracting the maximum (i.e., saturated) observed H-alpha absorption equivalent width for a star of a similar color. Heating of the chromosphere through X-ray back-heating is not the dominant component of chromospheric heating in dM stars, although in the very active late-type stars its contribution could be about 50 percent.

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