Hydrogen Column Density Measurements toward White Dwarfs for D/H Studies

Details Hydrogen Column Density Measurements toward White Dwarfs for D/H Studies Hydrogen Column Density Measurements toward White Dwarfs for D/H Studies

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..348..460v&link_type=abstract

Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Confe

Astronomy and Astrophysics

Astrophysics

Scientific paper

Hot white dwarfs provide sources of extreme ultraviolet (EUV) radiation against which the photoionization continua of interstellar H I, He I, and He II are measured. The column density measurements depend on a detailed knowledge of the intrinsic EUV luminosity of the sources. We discuss recent progress in the study of low- and high-metallicity white dwarfs enabling a study of interstellar hydrogen and helium continuum absorptions toward many lines of sight. We compare the EUV-based measurements to recent hydrogen column density measurements based on Lyα line profiles and discuss the implications for D/H and O/H ratios in the local interstellar medium.

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