Boron in - and - Deficient F Stars, a Key Discriminator of Stellar Evolution Scenarios

Details Boron in - and - Deficient F Stars, a Key Discriminator of Stellar Evolution Scenarios Boron in - and - Deficient F Stars, a Key Discriminator of Stellar Evolution Scenarios

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5855b&link_type=abstract

HST Proposal ID #5855

Physics

Hst Proposal Id #5855 Cool Stars

Scientific paper

The surprising discovery that F stars in a narrow T_ eff range of only a few hundred degrees can be severely depleted in their surface Li abundance (a Li "dip") signals a fundamental failure of standard stellar evolution theory. Numerous physical mechanisms have been proposed to explain this dip, including microscopic diffusion, mass loss, meridional circulation, and rotationally-induced mixing driven by angular momentum loss. Identifying which of these (if any) might really be at work is not only of vital interest to stellar evolution theory, but also to cosmology. (For example, diffusion may lower age estimates for globular clusters, and rotationally-induced mixing suggests that the standard model of big bang nucleosynthesis may be incomplete.) B thus joins Li and Be as a crucial probe of stellar structure and discriminator of viable physical mechanisms, as the most powerful constraints are obtained when all three elements are considered simultaneously. B will be observed in ten stars, both solar metallicity and old disk (since depletion is metallicity dependent), five that are extremely deficient in Li and Be, four that are moderately so, and one that is Li- and Be- normal. We have extensive observational and theoretical experience using Li and Be (and have had CYCLE2 time to use B) as probes of stellar structure; supporting ground based observations of Li and Be have been (and continue to be) obtained, including from Keck/HIRES.

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