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Deuterium toward the WD0621-376 sight line: Results from the Far Ultraviolet Spectroscopic Explorer (FUSE) Mission | | N. Lehner
; C. Gry
; K.R. Sembach
; G. Hebrard
; P. Chayer
; H.W. Moos
; J.C. Howk
; J.-M. Desert
; | | Date: |
16 Nov 2001 | | Journal: | Astrophys.J.Suppl. 140 (2002) 81-90 | | Subject: | astro-ph | | Abstract: | Far Ultraviolet Spectroscopic Explorer observations are presented for WD0621-376, a DA white dwarf star in the local interstellar medium (LISM) at a distance of about 78 pc. The data have a signal-to-noise ratio of about 20-40 per 20 km/s resolution element and cover the wavelength range 905-1187 AA. LISM absorption is detected in the lines of D I, C II, C II*, C III, N I, N II, N III, O I, Ar I, and Fe II. This sight line is partially ionized, with an ionized nitrogen fraction of > 0.23. We determine the ratio $D/O = (3.9 pm ^{1.3}_{1.0}) imes 10^{-2}$ (2$sigma$). Assuming a standard interstellar oxygen abundance, we derive ${
m D/H} approx 1. 3 imes 10^{-5}$. Using the value of N(H I) derived from EUVE data gives a similar D/H ratio. The D I/N I ratio is $(3.3 pm ^{1.0}_{0.8}) imes 10^{-1}$ (2$sigma$). | | Source: | arXiv, astro-ph/0111336 | | Services: | Forum | Review | PDF | Favorites | |
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