Solar Mixture Opacity Calculations Using Detailed Configuration and Level Accounting Treatments

An opacity model (OPAS) combining detailed configuration and level accounting treatments has been developed to calculate radiative opacity of plasmas in local thermodynamic equilibrium. The model is presented and used to compute spectral opacities of a solar mixture. Various density-temperature coup...

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Veröffentlicht in:The Astrophysical journal 2012-01, Vol.745 (1), p.10-7
Hauptverfasser: Blancard, Christophe, Cossé, Philippe, Faussurier, Gérald
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creator Blancard, Christophe
Cossé, Philippe
Faussurier, Gérald
description An opacity model (OPAS) combining detailed configuration and level accounting treatments has been developed to calculate radiative opacity of plasmas in local thermodynamic equilibrium. The model is presented and used to compute spectral opacities of a solar mixture. Various density-temperature couples have been considered from the solar center up to the vicinity of the radiative/convective zone interface. For a given solar thermodynamic path, OPAS calculations are compared to Opacity Project (OP) and OPAL data. Rosseland mean opacity values are in very good agreement over all the considered solar thermodynamic path, while OPAS and OP spectral opacities of each element may vary considerably. Main sources of discrepancy are discussed.
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subjects Accounting
Astronomy
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Couples
DENSITY
Earth, ocean, space
Exact sciences and technology
Local thermodynamic equilibrium
LTE
Mathematical models
Opacity
Physics
PLASMA
Plasmas
Spectra
STAR EVOLUTION
SUN
Thermodynamics
title Solar Mixture Opacity Calculations Using Detailed Configuration and Level Accounting Treatments
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