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Paper: The Current Version of the SAHA-S Equation of State: Improvement and Perspective
Volume: 479, Progress in Physics of the Sun and Stars
Page: 11
Authors: Baturin, V. A.; Ayukov, S. V.; Gryaznov, V. K.; Iosilevskiy, I. L.; Fortov, V. E.; Starostin, A. N.
Abstract: The current version of SAHA-S (SAHA-S3), an equation of state (EOS) based on the chemical picture and which has been specifically proposed for the purpose of solar modeling, is discussed and proposed for public availability. All basic physical effects of the Coulomb interaction, exchange and diffraction effects, free electron degeneracy, relativistic corrections, and radiation pressure contributions are taken into account. The basic improvement in the presented version (SAHA-S3) is a detailed description of excited states of the ions of ten chemical elements. The physical assumptions in the EOS and main contributions to the Γ1-profile along an adiabat (typical in solar conditions) are described. Distributions of ionic abundances and contributions of elements to the Γ1-profile are plotted. The SAHA-S3 EOS is used in the calibration of the solar envelope and inversion of Γ1 in the solar convection zone.
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