Deuterium measurements toward the white dwarf PG 0038+199

Details Deuterium measurements toward the white dwarf PG 0038+199 Deuterium measurements toward the white dwarf PG 0038+199

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.7712w&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #77.12; Bulletin of the American Astronomical Society, Vol. 34, p.1230

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Primordial deuterium abundance measurements provide a strong constraint on the baryon density in the Universe. When combined with deuterium measurements in the local interstellar medium (ISM), they also provide constraints on models of galactic chemical evolution. Previous D studies have shown that at distances d >˜ 100 pc, there appears to be an increase in spatial variations of D/H. We probe this variation through a measurement of the deuterium abundance from 13 ksec of Far Ultraviolet Spectroscopic Explorer (FUSE) large aperture data of the He-rich white dwarf PG 0038+199 (DO, T=115000 K, log g=7.5, Galactic l = 119.79o, b=-42.66). At d ~ 300 pc it is one of the more distant objects examined for ISM deuterium studies with FUSE. Keck HIRES data (7 km s-1 resolution) reveal only one cold ISM component from Na I. The continuum of PG 0038+199 is not significantly affected by photospheric lines. Its UV flux of 2x 10-12 erg cm-2 s-1 Å-1 at 1000 Å offers a relatively bright background for ISM measurements. We will use a combination of profile fitting and curve of growth methods to measure the column densities of D I and a variety of other species such as H I (from the damping wings of Lyβ using a theoretical stellar model), O I, H2 etc.

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