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The Importance of Molecular Opacities in Stellar Atmospheres

Published online by Cambridge University Press:  12 April 2016

Christoper M. Sharp
Christoper M. Sharp*
Affiliation:
Service P.T.N., Centre d’Etudes de Bruyères-le-Châtel, B.P. 12, F-91680 Bruyères-le-Châtel, France

Extract

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Opacities are of vital importance in astrophysics necessary to model stellar atmospheres and interiors, and below about 6000 K diatomic molecules make an increasing contribution to that opacity. Moreover, at around 3000 K polyatomic molecules, such as H2O for an oxygen rich solar composition, start playing an important rôle, and additionally at high pressures collision induced H2 – H2 and H2 – He absorption is important for late-type main sequence stars.

In order to investigate the importance of molecular opacities, in Sharp (1992) we computed and compared opacities for a solar and a three times enhanced CNO abundance, and some further comparisons were made in Sharp et al. (1992). Some of these results are briefly summarised here.

Type
III. Input physics for stellar structure
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 263 - 265
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

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