Hot degenerate dwarfs in a two-phase model

The characteristics of degenerate dwarfs-core radius, mass, and energy, thickness of their outer layers-are calculated based on a mechanical-equilibrium equation in a five-parameter, two-phase compositemodel with an isothermal core and a non-degenerate outer region. An accurate equation of state for...

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Bibliographic Details
Published in:Astronomy reports 2013-12, Vol.57 (12), p.913-983
Main Authors: Vavrukh, M. V., Smerechinskii, S. V.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Dwarf stars
Observations and Techniques
Physics
Physics and Astronomy
Studies
Temperature distribution
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Summary:The characteristics of degenerate dwarfs-core radius, mass, and energy, thickness of their outer layers-are calculated based on a mechanical-equilibrium equation in a five-parameter, two-phase compositemodel with an isothermal core and a non-degenerate outer region. An accurate equation of state for the partially degenerate, ideal, relativistic electron gas of the core is used together with a polytropic approximation for the outer layers. The model parameters are determined using the known masses, radii, and luminosities of observed DA white dwarfs. A region where dwarfs can exist is identified in a plot of core temperature vs. the relativity parameter at the center of the star, and the dependence of the core temperature on the effective temperature of the photosphere is constructed.
ISSN:1063-7729
1562-6881
DOI:10.1134/S1063772913100065