Consequences of a chromospheric temperature gradient on the width of Hα in late-type giants

Details Consequences of a chromospheric temperature gradient on the width of Hα in late-type giants Consequences of a chromospheric temperature gradient on the width of Hα in late-type giants

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8419260z&link_type=abstract

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Physics

Chromosphere, Optical Properties, Temperature Gradients, Electron Energy, G Stars, Giant Stars, K Stars

Scientific paper

An analytic expression for the integrated H alpha optical depth profile is derived for a one dimensional slab geometry model chromosphere, with electron temperature increasing as a power law with height. The formula predicts H alpha opacity and profile width to be sensitive functions of the thermal gradient. Application of the model to observation reveals that broad H alpha absorption widths in G and K giant stars are consistent with a mean H alpha chromospheric optical depth of 50, while narrower widths in M stars indicate slightly lower opacities. It is proposed that differences in H alpha width between late-type giants of similar spectral type may be due, in part, to differences in their chromospheric thermal gradient, and associated H alpha opacity.

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