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

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

2004-10-14

arxiv.org/abs/astro-ph/0410358v1

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, to appear in the proceedings of 14th European Workshop on White Dwarfs

Scientific paper

The 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.

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