Deuterium astration in the local disc and beyond

Details Deuterium astration in the local disc and beyond Deuterium astration in the local disc and beyond

2006-03-08

arxiv.org/abs/astro-ph/0603190v1

Mon.Not.Roy.Astron.Soc.369:295-304,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 6 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10287.x

(Abridged) Estimates of the interstellar deuterium abundance span a wide range of values. Here we study the evolution of deuterium in the framework of successful models for the chemical evolution of the Milky Way able to reproduce the majority of the observational constraints for the solar neighbourhood and for the Galactic disc. We show that, in the framework of our models, the lowest D/H values observed locally cannot be explained in terms of simple astration processes occurring during the Galaxy evolution. Indeed, the combination of a mild star formation and a continuous infall of unprocessed gas required to fit all the available observational data allows only a modest variation of the deuterium abundance from its primordial value.

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