The Deuterium, Oxygen, and Nitrogen Abundance toward LSE 44

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 adistance of 554+/-66 pc. This target is among the seven most distant Galacticsight lines for which these abundance ratios have been measured. The columndensities were estimated by profile fitting and curve of growth analyses. Wefind 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 distantGalactic sight lines for which the deuterium abundance has been measured LSE 44is one of the few with D/H higher than the Local Bubble value, but D/O towardall these targets is below the Local Bubble value and more uniform than the D/Hdistribution. (Abstract abridged.)Comment: 20 pages, including 9 figures. Accepted for publication in Ap