B and BE as Probes of Cosmic Ray Spallation and Stellar Structure

Details B and BE as Probes of Cosmic Ray Spallation and Stellar Structure B and BE as Probes of Cosmic Ray Spallation and Stellar Structure

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2634d&link_type=abstract

HST Proposal ID #2634

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Hst Proposal Id #2634

Scientific paper

I. We propose to observe Boron and Beryllium in one intermediate metallicity halo stars ([Fe/H]~-1.5) which appears to have formed at the time when the galaxy was just beginning to syntheize those two light elements through the spallation reactions of cosmic rays on C,N,O nuclei in the interstellar medium. The B and Be abundances and their ratio yield knowledge of the energetic particle flux at this epoch and on the time of formation of the halo, in the same way that the current interstellar medium light element abundances are used to constrain theories of present cosmic rays. II. We propose to observe B in two stars in the "Li gap," the mysterious narrow temperature range in F stars in which Li is depleted by more than an order of magnitude compared to stars just a few 100 K hotter or cooler. Knowledge of whether B is depleted in the same star should help decide whether turbulent diffusion, gravitational settling, or some other as yet unknown mixing process is responsible for the gap.

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