Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr..j103g&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #J1.03
Physics
Scientific paper
Light elements, in particular D and ^3He, are commonly used to test the predictions of big bang nucleosynthesis and to obtain bounds on the baryon-to-photon ratio η. Current models of stellar evolution predict a production of ^3He in stars of low and intermediate mass, that, when averaged over the Galactic lifetime, leads to a severe inconsistency between theoretical results and observed abundances. Non-standard stellar models, where the production of ^3He is significantly reduced by some ``depletion mechanism'' acting inside the star offer an appealing alternative, with possible interesting consequences on the problem of missing solar neutrinos. However, these models face serious difficulties to account for the values of ^3He recently determined in the ejecta of a few planetary nebulae, which appear at the moment to be in good agreement with the predictions of standard stellar models. In this talk I will review the observational evidence, the theoretical results and the possible solutions to this ``^3He problem''.
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