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An Improved Equation of State for Hydrogen

Published online by Cambridge University Press:  12 April 2016

D. Saumon  and
G. Chabrier
D. Saumon
Affiliation:
Lunar and Planetary Laboratory, University of Arizona, Tucson AZ 85721
G. Chabrier
Affiliation:
Ecole Normale Supérieure, 69364 Lyon Cedex 07, France

Extract

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An improved theory of fluid hydrogen at high density, based on a detailed treatment of inter-particle correlations and a self-consistent treatment of pressure ionization, has become available recently (Chabrier 1990, Saumon and Chabrier 1991, 1992). We present a preliminary comparison between this new EOS (hereatfer SC) and equations of state frequently used in astrophysical contexts, namely: Fontaine, Graboske and Van Horn 1977 (FGVH), Däppen et al. 1988 (MHD) and Magni and Mazzitelli 1979 (MM).

The SC theory predicts a first-order phase transition in the region of pressure-ionization (the so-called Plasma Phase Transition, or PPT), between an essentially neutral mixture of atoms and molecules (xe– < 10−2), and a partially ionized plasma (xe– ≈ 50 %), with a critical point located at Pc = 0.614 Mbar, Tc = 15300K and pc = 0.35 g/cm3.

Type
III. Input physics for stellar structure
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 307 - 309
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

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