Paper:	A New Generation of Cool White Dwarf Atmosphere Models Using Ab Initio Calculations
Volume:	509, 20th European Workshop on White Dwarfs (EuroWD16)
Page:	227
Authors:	Blouin, S.; Dufour, P.; Kowalski, P. M.
Abstract:	Due to their high photospheric density, cool helium-rich white dwarfs (particularly DZ, DQpec and ultracool) are often poorly described by current atmosphere models. As part of our ongoing efforts to design atmosphere models suitable for all cool white dwarfs, we investigate how the ionization ratio of heavy elements and the H2-He collision-induced absorption (CIA) spectrum are altered under fluid-like densities. For the conditions encountered at the photosphere of cool helium-rich white dwarfs, our ab initio calculations show that the ionization of most metals is inhibited and that the H2-He CIA spectrum is significantly distorted for densities higher than 0.1 g/cm3.

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