2000/01/24 by M. Tosi, Monica Tosi, Tosi, Monica · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Astrophysics (astro-ph) #Astrophysics and Star Formation Studies #FOS: Physical sciences #Scientific Research and Discoveries #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0001409
10 pages including 7 figs, to appear in "The Light Elements and Their Evolution", IAU Symp.198, L. Da Silva, M. Spite, J.R. Medeiros eds, ASP Conf. Ser., in press
arxiv created 2000/01/24 · openalex publication_date 2000/01/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The predictions of Galactic chemical evolution models for D and 3He are described in connection with those on the other Galactic quantities for which observational constraints are available. Models in agreement with the largest set of data predict deuterium depletions from the Big Bang to the present epoch smaller than a factor of 3 and do not allow for D/H primordial abundances larger than ∼4×10-5. Models predicting higher D consumption do not reproduce other observed features of our Galaxy. If both the primordial D and 3He are low, models assuming that 90% of low-mass stars experience an extra-mixing during the red giant phase reproduce all the 3He observed abundances. The same percentage allows to fit also the observed carbon isotopic ratios, thus supporting the self-consistency of the extra-mixing mechanism.