The Deuterium, Oxygen, and Nitrogen Abundance Toward LSE 44

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

2005-10-19

arxiv.org/abs/astro-ph/0510593v1

Astrophys.J.638:847-859,2006

Astronomy and Astrophysics

Astrophysics

20 pages, including 9 figures. Accepted for publication in ApJ

Scientific paper

10.1086/498969

We present measurements of the column densities of interstellar DI, OI, NI, and H2 made with FUSE, and of HI made with IUE toward the sdO star LSE 44, at a distance of 554+/-66 pc. This target is among the seven most distant Galactic sight lines for which these abundance ratios have been measured. The column densities were estimated by profile fitting and curve of growth analyses. We find D/H = (2.24 +1.39 -1.32)E-5, D/O = (1.99 +1.30 -0.67)E-2, D/N = (2.75 +1.19 -0.89)E-1, and O/H = (1.13 +0.96 -0.71)E-3 (2 sigma). Of the most distant Galactic sight lines for which the deuterium abundance has been measured LSE 44 is one of the few with D/H higher than the Local Bubble value, but D/O toward all these targets is below the Local Bubble value and more uniform than the D/H distribution. (Abstract abridged.)

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