Abundances of Deuterium, Nitrogen, and Oxygen toward HZ 43A: Results from the FUSE Mission

Details Abundances of Deuterium, Nitrogen, and Oxygen toward HZ 43A: Results from the FUSE Mission Abundances of Deuterium, Nitrogen, and Oxygen toward HZ 43A: Results from the FUSE Mission

2002-01-18

arxiv.org/abs/astro-ph/0201298v1

Astrophys.J.Suppl. 140 (2002) 19-36

Astronomy and Astrophysics

Astrophysics

52 pages, 12 figures. To be published in the May ApJS 2002

Scientific paper

10.1086/339131

We present an analysis of interstellar absorption along the line of sight to the nearby white dwarf star HZ43A. The distance to this star is 68+/-13 pc, and the line of sight extends toward the north Galactic pole. Column densities of OI, NI, and NII were derived from spectra obtained by the Far Ultraviolet Spectroscopic Explorer (FUSE), the column density of DI was derived from a combination of our FUSE spectra and an archival HST GHRS spectrum, and the column density of HI was derived from a combination of the GHRS spectrum and values derived from EUVE data obtained from the literature. We find the following abundance ratios (with 2-sigma uncertainties): DI/HI = (1.66 +/- 0.28) x 10^-5, OI/HI = (3.63 +/- 0.84) x 10^-4, and NI/HI = (3.80 +/- 0.74) x 10^-5. The NII column density was slightly greater than that of NI, indicating that ionization corrections are important when deriving nitrogen abundances. Other interstellar species detected along the line of sight were CII, CIII, OVI, SiII, ArI, MgII, and FeII; an upper limit was determined for NIII. No elements other than HI were detected in the stellar photosphere.

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