Interpolations of Rosseland-mean opacities for variable X and Z

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atomic Data, Radiative Transfer, Astronomical Data Bases: Miscellaneous

Scientific paper

For fixed relative abundances of `metal' atoms, stellar compositions are specified by mass fractions X for hydrogen and Z for metals (the helium mass fraction being Y=1-X-Z). Rosseland-mean opacities depend on temperature, T, density, rho, and chemical compositions. Interpolations in T and rho were discussed in a previous paper. The present paper is concerned with interpolations in X and Z. The opacities are calculated on a grid of (X, Z) values together with information giving derivatives of opacities with respect to X and Z. Opacities for any required value of X and Z can then be obtained using bicubic interpolations. The opacity tables, and codes for making interpolations, are available at the Centre de Donnees de Strasbourg (CDS).*

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