D/H Toward BD+28 4211: First FUSE Results

Details D/H Toward BD+28 4211: First FUSE Results D/H Toward BD+28 4211: First FUSE Results

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.3602s&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #36.02; Bulletin of the American Astronomical Society, Vol. 32, p.1449

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Scientific paper

The atomic deuterium-to-hydrogen abundance ratio has been evaluated for the sight line toward the hot O subdwarf BD+28o 4211. High signal-to-noise ratio (S/N ~ 100) observations covering the wavelength range 905 - 1187 Å at a wavelength resolving power of λ /Δ λ ~ 20,000 were obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite. BD+28o 4211 is ~100 pc away with a total H I column density of ~7 x 1019 cm-2, much higher than is typically found in the Local ISM. The deuterium column density was measured by analyzing several D I Lyman series transitions (Lyman δ , ɛ , η , θ , ι ) with curve of growth and profile fitting techniques, after determining which lines were free of interference from other interstellar species and narrow stellar features. The neutral hydrogen column density was measured by an analysis of the Lyman α profile using HST/STIS and GHRS spectra. The stellar spectrum of BD+28o 4211 was modelled to assist in determining the sensitivity of H I (Ly α ) and D I to the continuum placement and to identify stellar transitions. The D I and H I column densities, their uncertainties, and potential sources of systematic error will be presented. This work is based on data obtained for the FUSE Guaranteed Time Team by the NASA-CNES-CSA FUSE mission operated by the Johns Hopkins University. Financial support to U. S. participants has been provided in part by NASA contract NAS5-32985.

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