Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279...95s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 279, Issue 1, pp. 95-100.
Astronomy and Astrophysics
Astronomy
22
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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