Connecting the primordial and Galactic deuterium abundances

Details Connecting the primordial and Galactic deuterium abundances Connecting the primordial and Galactic deuterium abundances

2007-03-27

arxiv.org/abs/astro-ph/0703682v1

Mon.Not.Roy.Astron.Soc.378:576-580,2007

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures; accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11780.x

The deuterium abundances inferred from observations of the interstellar medium within 1-2 kpc of the Sun range over a factor of three and the corresponding oxygen abundances show an even larger dispersion. While the lower D (and O) abundances likely result from depletion onto dust, the higher D abundances are consistent with the BBN-predicted primordial D abundance and chemical evolution models of the Galaxy with infall of primordial or nearly primordial material. The large ranges in deuterium and oxygen abundances suggest that the effects of depletion and/or infall have not been homogenized in the local interstellar medium.

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