The Hydrogen Abundance in the Hot DB White Dwarfs

Details The Hydrogen Abundance in the Hot DB White Dwarfs The Hydrogen Abundance in the Hot DB White Dwarfs

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..181w&link_type=abstract

NOAO Proposal ID #1999B-0181

Physics

Scientific paper

We propose to carry out spectroscopic observations at H(alpha) of a sample of helium-line DB white dwarfs, most of them hotter than T_eff~ 18,000 K. These observations, coupled to model atmosphere calculations for these objects, will allow us to constrain the hydrogen abundance in this sample. Because the effective temperature we determine from existing blue optical spectra of DB stars is sensitive to the presence of undetected trace quantities of hydrogen, the unknown photospheric H/He ratio remains the last stumbling block toward a determination of an accurate spectroscopic temperature scale for the hottest DB stars. The determination of the hydrogen abundance in hot DB stars is likely to have a significant impact on the field of white dwarf asteroseismology, and would also provide additional constraints in our study of the spectral evolution of white dwarfs.

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