Thermodynamic functions, freezing transition, and phase diagram of dense carbon-oxygen mixtures in white dwarfs

Details Thermodynamic functions, freezing transition, and phase diagram of dense carbon-oxygen mixtures in white dwarfs Thermodynamic functions, freezing transition, and phase diagram of dense carbon-oxygen mixtures in white dwarfs

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrvb..40..309i&link_type=abstract

Physical Review B (Condensed Matter), Volume 40, Issue 1, July 1, 1989, pp.309-315

Physics

Condensed Matter

12

Solid-Liquid Transitions, Equations Of State Of Specific Substances, Supernovae

Scientific paper

Equations of state for dense carbon-oxygen (C-O) binary-ionic mixtures (BIM's) appropriate to the interiors of white dwarfs are investigated through Monte Carlo simulations, by solution of relevant integral equations and variational calculations in the density-functional formalism. It is thereby shown that the internal energies of the C-O BIM solids and fluids both obey precisely the linear mixing formulas. We then present an accurate calculation of the phase diagram associated with freezing transitions in such BIM materials, resulting in a novel prediction of an azeotropic diagram. Discontinuities of the mass density across the azeotropic phase boundaries are evaluated numerically for application to a study of white-dwarf evolution.

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