Low temperature mean opacities for the carbon-rich regime

Details Low temperature mean opacities for the carbon-rich regime Low temperature mean opacities for the carbon-rich regime

2007-12-17

arxiv.org/abs/0712.2772v2

AIP Conf.Proc.1001:11-18,2008

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures. To appear in the AIP Proceedings of the IXth Torino Workshop on AGB Nucleosynthesis

Scientific paper

10.1063/1.2916953

Asymptotic Giant Branch (AGB) stars undergo a change in their chemical composition during their evolution. This in turn leads to an alteration of the radiative opacities, especially in the cool layers of the envelope and the atmosphere, where molecules are the dominant opacity sources. A key parameter in this respect is the number ratio of carbon to oxygen atoms (C/O). In terms of low temperature mean opacities, a variation of this parameter usually cannot be followed in stellar evolution models, because up to now tabulated values were only available for scaled solar metal mixtures (with C/O ~ 0.5). We thus present a set of newly generated tables containing Rosseland mean opacity coefficients covering both the oxygen-rich (C/O < 1) and the carbon-rich (C/O > 1) regime. We compare our values to existing tabular data and investigate the relevant molecular opacity contributors.

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