Non-Ideal Equation of State, Refraction and Opacities in Very Cool, Helium-Rich White Dwarf Atmospheres

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dc.creatorKowalski, P. M.
dc.creatorSaumon, D.
dc.creatorMazevet, S.
dc.date2004-10-14
dc.date.accessioned2026-07-07T02:15:13Z
dc.date.available2026-07-07T02:15:13Z
dc.descriptionThe atmospheres of cool, helium-rich white dwarfs constitute an exotic and poorly explored physical regime of stellar atmospheres. Under physical conditions where the temperature varies from $\rm 1000K$ to $\rm 10000K$, the density can reach values as large as $\rm 2 g/cm^{3}$, and the pressure is as high as $\rm 1 Mbar$, the atmosphere is no longer an ideal gas and must be treated as a dense fluid. Helium atoms become strongly correlated and refraction effects are present. Opacity sources such as $\rm He^{-}$ free-free absorption must be calculated with a formalism that has never been applied to astrophysical opacities. These effects have been ignored in previous models of cool white dwarf atmospheres.
dc.description6 pages, 5 figures, to appear in the proceedings of 14th European Workshop on White Dwarfs
dc.identifierhttps://arxiv.org/abs/astro-ph/0410358
dc.identifierhttp://arxiv.org/abs/astro-ph/0410358
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8372
dc.subjectAstrophysics
dc.titleNon-Ideal Equation of State, Refraction and Opacities in Very Cool, Helium-Rich White Dwarf Atmospheres
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