Extreme possible variations of the deuterium abundance within the Galaxy

Details Extreme possible variations of the deuterium abundance within the Galaxy Extreme possible variations of the deuterium abundance within the Galaxy

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..365d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 365-367.

Astronomy and Astrophysics

Astrophysics

11

Abundance, Deuterium, Galactic Evolution, Milky Way Galaxy, Baryons, Big Bang Cosmology, Chemical Evolution, Helium Isotopes

Scientific paper

In order to reconcile the present baryonic densities deduced respectively from the primordial abundances of D and 4He, some recent chemical evolution models imply that D could have been destroyed more thoroughly during the Galaxy evolution than what was previously predicted. Under the conditions outlined by these models, the present abundance of D may vary by factors as large as 50 in different parts of the Galaxy. If such variations are not observed, this implies that the ratio X(D)prim/X(D)present is not large (2 - 3): the simplest Big Bang models may then be unable to reconcile the baryonic densities predicted by D and 4He respectively.

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