The equation of state in the chemical picture: a grandcanonical approach III. Thermodynamic properties and nonideal effects.
Abstract
On the basis of the grandcanonical approach of Paper I, general formulae are derived for the computation of the thermodynamic properties of a stellar gas. The nonideal effects due to interparticle interactions are included in terms of the occupation probability of bound configurations and the depression of energy levels of free electrons. Analytical expressions are explicitly given to calculate the contributions from the nonideal effects to the thermodynamic quantities. Representative results for pressure and internal energy of a stellar gas are presented to show the magnitudes and the effective regions of the nonideal effects. The results also show a plasma phase transition in densecool stellar gases with a critical temperature of about logT=4.7.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 April 1994
 Bibcode:
 1994A&A...284..684L
 Keywords:

 Atomic Interactions;
 Canonical Forms;
 Equations Of State;
 Stellar Interiors;
 Thermodynamic Properties;
 Critical Temperature;
 Internal Energy;
 Plasma Pressure;
 Astrophysics;
 ATOMIC PROCESSES;
 EQUATION OF STATE;
 STARS: INTERIORS