Physics – Nuclear Physics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nupha.621..576c&link_type=abstract
Nuclear Physics A, v. 621, p. 576-579.
Physics
Nuclear Physics
Scientific paper
The primordial abundances of the light elements provide crucial tests to the standard hot big bang model. However, their values are not obtained directly, but are derived through chemical evolution models from measurements in environments that have undergone stellar processing. In this respect, understanding nuclear and mixing processes that affect light element abundances in stars is a key issue. Recent progress in the input physics of stellar models, together with new observational data, allow us to reconsider the evolution (production and/or destruction) of light elements in low mass stars. Using a new generation of stellar evolutionary models, computed with element segregation, rotation-induced mixing and stellar winds, we discuss the impact of each of these processes on lithium depletion in halo stars and on 3He stellar yields. From our results, we derive a primordial lithium abundance of 2.5+/-0.1, and avoid a large 3He production in the Galaxy.
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