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Effects of Non-Local Thermodynamic Equilibrium (NLTE) on Molecular Opacities

Published online by Cambridge University Press:  12 April 2016

Hollis R. Johnson
Hollis R. Johnson*
Affiliation:
Astronomy Department SW 319, Indiana University, Bloomington, IN 47405, U.S.A.

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Molecules increase in importance in stellar atmospheres as the temperature falls along the spectral sequence for all luminosity classes. Among their many roles molecular features provide the basis for spectral classification (temperature and chemical composition) in M, S, and C stars; they constitute important opacity sources across the spectrum from the ultraviolet to the infrared; they influence the energy budget and hence the kinetic temperature in the outer photospheric layers; they may contribute significantly to the radiative levitation of the atmosphere; they form masers; they may cause or facilitate mass loss; and they are indicative of physical conditions and processes from the photosphere to the outer circumstellar envelope.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 146: Molecules in the Stellar Environment , 1994 , pp. 234 - 249
Copyright
Copyright © Springer-Verlag 1994

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