Paper:	Spectroscopic Analysis of Hybrid White Dwarf Spectra from the Sloan Digital Sky Survey
Volume:	509, 20th European Workshop on White Dwarfs (EuroWD16)
Page:	211
Authors:	Manseau, P. M.; Bergeron, P.; Green, E. M.
Abstract:	We present a model atmosphere analysis of hot (Teff> 30 000 K) white dwarf spectra from the Sloan Digital Sky Survey showing both hydrogen and helium lines, under the assumption of chemically homogeneous and stratified atmospheric compositions. We identify several hybrid white dwarfs in the SDSS that are better explained in terms of chemically stratified atmospheres, where a thin hydrogen atmosphere floats in diffusive equilibrium on top of a more massive helium envelope. We also present an updated analysis of PG 1305–017, the only stratified white dwarf identified in previous spectroscopic analyses of DAO white dwarfs. We interpret our results in the general context of the spectral evolution of white dwarfs.

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