Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..768c&link_type=abstract
Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 768-772.
Astronomy and Astrophysics
Astrophysics
48
Atmospheric Heating, Chromosphere, Dwarf Stars, M Stars, Radiant Heating, X Ray Sources, Atmospheric Temperature, Emission Spectra, Late Stars, Line Spectra, Plasma Heating, Radiant Flux Density, Stellar Coronas, Stellar Evolution, Stellar Luminosity, Stellar Models
Scientific paper
The Einstein Observatory has found dwarf M stars to be particularly intense X-ray sources, with an X-ray luminosity that may be as large as 10% of the stellar visual luminosity. The present paper discusses the potential contributions of the coronal X-ray flux to the heating of dMe star chromospheres. The components of quiescent chromospheric heating by a coronal X-ray source are examined, with attention given to X-ray source characteristics, X-ray transfer, and the atmospheric energy balance. A model chromosphere for dMe stars is constructed based on a radiative equilibrium model photosphere with solar abundances. It is shown that X-ray heating may account for both the quantity and distribution of radiative losses from the chromosphere of a quiescent dMe star, and thus may resolve the problem of the inadequacy of acoustic-wave chromospheric heating.
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