Deuterium Toward WD1634-573: Results from the Far Ultraviolet Spectroscopic Explorer (FUSE) Mission

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dc.creatorWood, B. E.
dc.creatorLinsky, J. L.
dc.creatorHebrard, G.
dc.creatorVidal-Madjar, A.
dc.creatorLemoine, M.
dc.creatorMoos, H. W.
dc.creatorSembach, K. R.
dc.creatorJenkins, E. B.
dc.date2001-12-12
dc.date.accessioned2026-07-07T10:31:10Z
dc.date.available2026-07-07T10:31:10Z
dc.descriptionWe use Far Ultraviolet Spectrocopic Explorer (FUSE) observations to study interstellar absorption along the line of sight to the white dwarf WD1634-573 (d=37.1+/-2.6 pc). Combining our measurement of D I with a measurement of H I from Extreme Ultraviolet Explorer data, we find a D/H ratio toward WD1634-573 of D/H=(1.6+/-0.5)e-5. In contrast, multiplying our measurements of D I/O I=0.035+/-0.006 and D I/N I=0.27+/-0.05 with published mean Galactic ISM gas phase O/H and N/H ratios yields D/H(O)=(1.2+/-0.2)e-5 and D/H(N)=(2.0+/-0.4)e-5, respectively. Note that all uncertainties quoted above are 2 sigma. The inconsistency between D/H(O) and D/H(N) suggests that either the O I/H I and/or the N I/H I ratio toward WD1634-573 must be different from the previously measured average ISM O/H and N/H values. The computation of D/H(N) from D I/N I is more suspect, since the relative N and H ionization states could conceivably vary within the LISM, while the O and H ionization states will be more tightly coupled by charge exchange.
dc.description23 pages, 5 figures; AASTEX v5.0 plus EPSF extensions in mkfig.sty; accepted by ApJ Supplement
dc.identifierhttps://arxiv.org/abs/astro-ph/0112296
dc.identifierhttp://arxiv.org/abs/astro-ph/0112296
dc.identifierAstrophys.J.Suppl.140:91-102,2002
dc.identifierdoi:10.1086/339127
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178320
dc.subjectAstrophysics
dc.titleDeuterium Toward WD1634-573: Results from the Far Ultraviolet Spectroscopic Explorer (FUSE) Mission
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