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

Journal Article · Sat Jul 01 00:00:00 EDT 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.40.309· OSTI ID:5875722

Iyetomi, H; Ogata, S; Ichimaru, S

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 andvariational 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 areevaluated numerically for application to a study of white-dwarf evolution.

• Research Organization: Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan(JP)
• OSTI ID: 5875722
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 40:1
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY MIXTURES
FREEZING
PHASE DIAGRAMS
CARBON
OXYGEN
WHITE DWARF STARS
STAR EVOLUTION
AZEOTROPE
EQUATIONS OF STATE
INTEGRAL EQUATIONS
MONTE CARLO METHOD
SIMULATION
THERMODYNAMIC PROPERTIES
VARIATIONAL METHODS
DIAGRAMS
DISPERSIONS
DWARF STARS
ELEMENTS
EQUATIONS
MIXTURES
NONMETALS
PHYSICAL PROPERTIES
STARS
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