Boron in stars of same O and Li, but different Be: testing cosmic-ray vs. neutrino spallation

Details Boron in stars of same O and Li, but different Be: testing cosmic-ray vs. neutrino spallation Boron in stars of same O and Li, but different Be: testing cosmic-ray vs. neutrino spallation

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9900p&link_type=abstract

HST Proposal ID #9900

Physics

Hst Proposal Id #9900 Cool Stars

Scientific paper

We propose to further investigate the origin of the light elements Li, Be, and B, by observing B in a group of galactic stars found to have similar O abundances but to differ significantly in their Be content. Contrary to Li, which is produced in the Big Bang and its abundance in halo stars constrains primordial nucleosynthesis and the baryonic density, Be and B are produced later by cosmic ray spallation as the galactic halo forms. Knowledge of their evolution is now being used along with that of [O/H] {and [Fe/H]} as a powerful discriminant between different models of the chemical and dynamical evolution of the galaxy. Light element abundances can be used to test these theories only if they have not been altered by destruction in stars. Recently we have identified a small number of stars characterised by the same O abundance but large differences in their Be content, which cannot be accounted for by stellar depletion {since their Li is undepleted}. As neutrino-spallation contributes only to the production of isotope 11 of B, and not to Be, Be and B abundanes in the same stars will allow us to see if B scales with Be {evidence for a CR spallation origin} or with O {evidence for contribution from neutrino spallation}.

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