 |
 |
Astron. Astrophys. 364, 157-164 (2000)
Coulomb corrections to the equation of state for a weakly-coupled plasma
S.L. Bi 1,
M.P. Di Mauro 2 and
J. Christensen-Dalsgaard 2,3
1 Yunnan Astronomical Observatory, NAOCAS, Chinese Academy of Sciences, Kunming 650011, P.R. China (bsl@cosmos.ynao.ac.cn)
2 Theoretical Astrophysics Center, Danish National Research Foundation
3 University of Aarhus, Institute of Physics and Astronomy, 8000 Aarhus C, Denmark
Received 25 April 2000 / Accepted 28 September 2000
Abstract
Coulomb corrections to the equation of state of degenerate matter
are usually described by Debye-Hückel theory; however, recent
studies have considered modifications of thermodynamic quantities
which are caused by the interactions of charged particles beyond the
Debye-Hückel approximation. Based on the weakly-coupled plasma
limit, the formulae for the physical properties of non-ideal effects
on the equation of state are derived. The treatment of the non-ideal
effects due to Coulomb coupling combines the results of
quantum-statistic calculations for the electrons, N-body
semianalytic theory for ions, and the extended Debye-Hückel
theory with hard-core correction for the electron-ion interaction. The
leading Coulomb correction not only can be applied to the
weak-coupling region, but also preserves the well-known
Debye-Hückel limit at ![[FORMULA]](img1.gif)
. We
examine the Coulomb correction to the thermodynamic quantities of a
weakly coupled and fully ionized plasma. The result reveals that the
contribution is quite significant, and hence modifies the
thermodynamic properties of the plasma substantially.
Key words: equation of
state 
Sun: general
stars: interiors
Send offprint requests to: Bi Shaolan
This article contains no SIMBAD objects.
Contents
- 1. Introduction
- 2. Theoretical schemes
- 3. Coulomb coupling
- 4. Results and discussion
- 5. Summary
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: December 15, 2000
helpdesk.link@springer.de