Theoretical stellar chromospheres of late type stars. III - Models for Procyon, Capella, Pollux, and 70 Ophiuchi A

Details Theoretical stellar chromospheres of late type stars. III - Models for Procyon, Capella, Pollux, and 70 Ophiuchi A Theoretical stellar chromospheres of late type stars. III - Models for Procyon, Capella, Pollux, and 70 Ophiuchi A

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84..191s&link_type=abstract

Astronomy and Astrophysics, vol. 84, no. 1-2, Apr. 1980, p. 191-199.

Astronomy and Astrophysics

Astrophysics

17

Acoustic Propagation, Atmospheric Heating, Chromosphere, Late Stars, Stellar Models, Dwarf Stars, Lighthill Gas Model, Mathematical Models, Mixing Length Flow Theory, Stellar Radiation, Stellar Temperature

Scientific paper

Theoretical chromosphere models for six stars are computed on the basis of the short period acoustic heating theory using acoustic fluxes predicted by the Lighthill-Proudman and mixing length theories. A comparison with semiempirical chromosphere models shows that the heights of the temperature minima agree rather well. Independently the acoustic flux at the temperature minimum is found to be roughly equal to the semi- empirical chromospheric radiation flux. This supports claims that short period acoustic waves are an important mechanism for the heating of the lower chromospheres of stars. For late type stars with high Teff or low gravity the temperature minimum is found close to the outer limit of the radiative damping zone while for late type dwarf stars the temperature minimum occurs close to the height of shock formation.

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