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The close DAO+dM binary RE J0720-318: a stratified white dwarf with a thin H layer and a possible circumbinary disk
[article]
1996
arXiv
pre-print
We have analysed the EUVE spectrum of the DAO white dwarf RE J0720-318. In contrast to the optical spectrum, which can only be fitted with a homogeneously mixed atmosphere, we find the EUVE spectrum can only be matched with a stratified structure. The H layer mass of 3x10**-14 solar masses is a factor ~10 below upper limits from previous EUVE observations of white dwarfs. In addition we detect an unprecedented HeI/HI ratio of ~1 for the absorbing column along the line of sight, implying an H
arXiv:astro-ph/9610268v1
fatcat:iltg4fxsl5edpgwblnmymvloki