The NA I lines as an indicator of chromospheres of late-type stars

Details The NA I lines as an indicator of chromospheres of late-type stars The NA I lines as an indicator of chromospheres of late-type stars

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987azh....64.1269s&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 64, Nov.-Dec. 1987, p. 1269-1279. In Russian.

Astronomy and Astrophysics

Astronomy

7

Chromosphere, Late Stars, Line Spectra, Sodium, Stellar Temperature, Equilibrium Equations, Radiative Transfer, Resonance Lines

Scientific paper

This paper presents results of a theoretical analysis of the Na I line formation to determine the possible existence of chromospheres of late-type stars. The method of the analysis is based on the solution of the equation of radiative transfer coupled to statistical equilibrium equations. The analysis is performed for stars with effective temperatures in the range 6500 - 3300K. It is shown that Na I resonance lines are collisionally dominated, so they may give information about the temperature distribution near the temperature minimum for the stars later than K0.

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