7Li Creation and 3He Destruction in Low Mass Stars

Details 7Li Creation and 3He Destruction in Low Mass Stars 7Li Creation and 3He Destruction in Low Mass Stars

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nupha.621..439b&link_type=abstract

Nuclear Physics A, v. 621, p. 439-442.

Physics

Nuclear Physics

Scientific paper

In low mass stars (< 2.5 Msolar), the 12C/(13C) ratio on the upper red giant branch (RGB) is lower than expected from first dredge-up in standard stellar models; this has been attributed to ``extra mixing'' induced by rotation, and resulting partial CNO processing of material in the stellar envelope. A simple circulation model of such extra mixing has been constructed; it is shown that 7Li-rich low-mass RGB stars can result. Also, considerable 3He destruction is predicted, counteracting the enrichment from first dredge-up. An estimate of the final 3He abundance as a function of stellar mass and metallicity indicates that stars are net destroyers of 3He. A slight increase is thereby permitted in the inferred upper bound on the primordial (D+3He)/H ratio, yielding a slight reduction in the lower bound on the cosmic baryon density Ωb from big bang nucleosynthesis calculations.

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