Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..316c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. 316-324.
Astronomy and Astrophysics
Astrophysics
57
Chromosphere, Cool Stars, Dwarf Stars, H Alpha Line, M Stars, Stellar Models, Atmospheric Temperature, Calcium, Late Stars, Potassium, Spectral Line Width
Scientific paper
A simple theory of the formation of H-alpha and Ca II K in dwarf M stars has been developed which relates the observed variations in the emission strengths of Ca II K and the equivalent widths of H-alpha to physical differences in the underlying chromospheric structure of the stars. The theory implies that Ca II K line emission fluxes increase monotonically with increasing chromospheric temperature or mass loading. However, H-alpha equivalent widths may increase or decrease with increasing chromospheric temperature or mass loading, depending on the actual values of the chromospheric parameters and the effective temperature. The theory is used to elucidate aspects of the available observational data on H-alpha and Ca II K lines in late-type dwarfs.
Cram Lawrence E.
Giampapa Mark S.
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