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An Improved Equation of State for Hydrogen
- Source :
- International Astronomical Union Colloquium. 137:307-309
- Publication Year :
- 1993
- Publisher :
- Cambridge University Press (CUP), 1993.
-
Abstract
- 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.
Details
- ISSN :
- 02529211
- Volume :
- 137
- Database :
- OpenAIRE
- Journal :
- International Astronomical Union Colloquium
- Accession number :
- edsair.doi...........df49ea3a0ae7685914e4b45b2f3cde91