Formation of the H-alpha absorption line in the chromospheres of cool stars

Details Formation of the H-alpha absorption line in the chromospheres of cool stars Formation of the H-alpha absorption line in the chromospheres of cool stars

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..626c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 15, 1985, p. 626-633.

Astronomy and Astrophysics

Astrophysics

59

Absorption Spectra, Chromosphere, Cool Stars, H Alpha Line, Stellar Spectra, Late Stars, Radiative Transfer, Spectral Line Width, Stellar Models, Velocity Distribution

Scientific paper

The authors discuss the theory of the formation of the Hα absorption line in the chromospheres of cool stars and present a number of results which demonstrate that observations of this line can provide valuable information on certain properties of stellar chromospheres. It is shown that the widespread existence of strong Hα absorption in cool stars indicates the equally widespread existence of stellar chromospheres. The calculations also reinforce the idea that the great widths of Hα absorption lines in late-type giant stars are due to nonthermal chromospheric velocity fields.

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