Abstract
The most recent chemical evolution models for D and 3He are reviewed and their results compared with the available data.
Models in agreement with the major galactic observational constraints predict deuterium depletion from the Big Bang to the present epoch smaller than a factor of 3 and therefore do not allow for D/H primordial abundances larger than ∼ 5 × 10-5. Models predicting higher D consumption do not seem to be able to reproduce other observed features of our galaxy (e.g. SFR, abundances, abundance ratios and/or gradients of heavier elements, metallicity distribution of G-dwarfs).
Observational and theoretical 3He abundances can be reconciled with each other if the majority of low mass stars experience in the red giant phase a deep mixing allowing the consumption of most of the 3He produced during core-hydrogen burning.
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Tosi, M. Galactic Evolution of D and 3He. Space Science Reviews 84, 207–218 (1998). https://doi.org/10.1023/A:1005079520706
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DOI: https://doi.org/10.1023/A:1005079520706