The chromospheric emission from acoustically heated stellar atmospheres

Details The chromospheric emission from acoustically heated stellar atmospheres The chromospheric emission from acoustically heated stellar atmospheres

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222..171u&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 171-178.

Computer Science

Sound

26

Chromosphere, Emission Spectra, Sound Waves, Stellar Atmospheres, Stellar Temperature, Late Stars, Line Spectra, Stellar Rotation

Scientific paper

General properties of acoustically heated chromospheres of late-type stars are derived. For a giant and a dwarf star of T(eff) = 5012 K, detailed acoustically heated chromosphere models are constructed and the theoretical Mg II and Ca II emission line fluxes are evaluated. The initial acoustic wave flux in the giant is assumed to be eight times larger than that of the dwarf. The computations show that due to photospheric radiation damping and the limiting shock strength behavior, the acoustic flux decreases much more rapidly in the giant than in the dwarf star such that roughly the same theoretical emission line fluxes are produced in both stars. This agrees with observations and removes a major argument against the acoustic heating theory for chromospheres of slowly rotating stars.

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