On the Dissociation Equilibrium of H2 in Very Cool, Helium-Rich White Dwarf Atmospheres

Details On the Dissociation Equilibrium of H2 in Very Cool, Helium-Rich White Dwarf Atmospheres On the Dissociation Equilibrium of H2 in Very Cool, Helium-Rich White Dwarf Atmospheres

2005-12-09

arxiv.org/abs/astro-ph/0512259v1

Astrophys.J.641:488-493,2006

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures, 1 table; Accepted for publication in The Astrophysical Journal

Scientific paper

10.1086/500358

We investigate the dissociation equilibrium of $\rm H_2$ in very cool, helium-rich white dwarf atmospheres. We present the solution of the non-ideal chemical equilibrium for the dissociation of molecular hydrogen in a medium of dense helium. We find that at the photosphere of cool white dwarfs of $T_{\rm eff}\rm=4000 K$, the non-ideality results in an increase of the mole fraction of molecular hydrogen by up to a factor of $\sim 10$, compared to the equilibrium value for the ideal gas. This increases the $\rm H_{2}-He$ CIA opacity by an order of magnitude and will affect the determination of the abundance of hydrogen in very cool, helium-rich white dwarfs.

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