The evolution of D and ^3^He in the Galactic disk.

Details The evolution of D and ^3^He in the Galactic disk. The evolution of D and ^3^He in the Galactic disk.

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...310..106p&link_type=abstract

Astronomy and Astrophysics, v.310, p.106-114

Astronomy and Astrophysics

Astrophysics

64

Nucleosynthesis, Galaxy: Abundances, Evolution

Scientific paper

The chemical evolution of deuterium and helium-3 in the disk of our Galaxy is studied with numerical models assuming infall. It is shown that, in the framework of our models, the current D gradient is considerably steeper than the corresponding oxygen gradient and very sensitive to the assumed history of infall. Combined to forthcoming observations of the D abundance across the galactic disk, those results can be used to derive information on the formation history of the Milky Way. The ^3^He abundance profile is found to be less sensitive to the details of the chemical evolution model; it depends essentially on the, still not quite well understood, nucleosynthesis of that isotope in low-mass stars.

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