Stellar model chromospheres. VI - Empirical estimates of the chromospheric radiative losses of late-type stars

Details Stellar model chromospheres. VI - Empirical estimates of the chromospheric radiative losses of late-type stars Stellar model chromospheres. VI - Empirical estimates of the chromospheric radiative losses of late-type stars

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..619l&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Mar. 1, 1978, p. 619-628.

Astronomy and Astrophysics

Astrophysics

137

Chromosphere, Late Stars, Radiative Transfer, Stellar Models, Convective Flow, Fraunhofer Lines, H Lines, K Lines, Mach Number, Stellar Magnetic Fields, Sun

Scientific paper

A method is developed for estimating the nonradiative heating of stellar chromospheres by measuring the net radiative losses in strong Fraunhofer line cores. This method is applied to observations of the Mg II resonance lines in a sample of 32 stars including the sun. At most a small dependence of chromospheric nonradiative heating on stellar surface gravity is found, which is contrary to the large effect predicted by recent calculations based on acoustic-heating theories.

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