Deuterium, Oxygen, and Nitrogen Abundance Toward LSE 44

Details Deuterium, Oxygen, and Nitrogen Abundance Toward LSE 44 Deuterium, Oxygen, and Nitrogen Abundance Toward LSE 44

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717504f&link_type=abstract

American Astronomical Society Meeting 207, #175.04; Bulletin of the American Astronomical Society, Vol. 37, p.1444

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We present FUSE measurements of D, O, N, H2, and Fe II, and IUE measurements of H toward LSE 44, an sdO star at a distance of 554±66 pc. This is among the most distant Galactic targets for which D/H, D/O, and D/N have been measured. Both profile fitting and curve-of-growth techniques have been utilized in the analysis. We find D/H = (2.24+1.39-1.32) × 10-5, D/O = (1.99+1.30-0.67) × 10-2, D/N = (2.75+1.19-0.89) × 10-1, and O/H = (1.13+0.96-0.71) × 10-3 (all errors 2σ ). This is one of the few sight lines probing material well beyond the Local Bubble for which D/H is higher than the Local Bubble value. Sight line to sight line variability of D/H for some targets, particularly those outside the Local Bubble, could be explained by varying degrees of depletion of deuterium onto dust grains, by infall of deuterium-rich primordial material, or by some other mechanism. However, D/O for these distant targets is uniform, and this discrepancy has yet to be explained.
This work is based on data obtained for the Guaranteed Time Team by the NASA-CNES-CSA FUSE mission operated by The Johns Hopkins University. Financial support has been provided to U.S. participants by NASA and to French participants by CNES.

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