The gravity dependence of the H-alpha width in late-type stars

Details The gravity dependence of the H-alpha width in late-type stars The gravity dependence of the H-alpha width in late-type stars

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..297z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 297-299.

Statistics

Computation

2

Chromosphere, Gravitational Effects, H Alpha Line, Late Stars, Spectral Line Width, Stellar Luminosity, Computational Astrophysics, Line Shape, Scaling Laws, Stellar Atmospheres, Stellar Gravitation, Stellar Temperature, Temperature Gradients

Scientific paper

The author develops a theoretical gravity-scaling law for the Hα absorption width in late-type stars. The derivation is based upon (1) the hydrostatic thickening of stellar chromospheres with decreasing surface gravity, and (2) a dependence of the Hα width upon opacity and Doppler width in a region subject to a chromospheric temperature rise. The scaling relation is approximately consistent with the mean gravity dependence deduced from the empirical correlation between Hα and Ca II K Wilson-Bappu widths. The calculations suggest that gravity variations in chromospheric-mass column density may, in addition to Doppler velocity enhancements, control the width-luminosity broadening of the Hα profile in late-type stars.

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