Be-Deficient Halo Stars: Implications for Galactic Chemical Evolution and Cosmology

Details Be-Deficient Halo Stars: Implications for Galactic Chemical Evolution and Cosmology Be-Deficient Halo Stars: Implications for Galactic Chemical Evolution and Cosmology

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6534d&link_type=abstract

HST Proposal ID #6534

Physics

Hst Proposal Id #6534 Cool Stars

Scientific paper

We propose to to investigate the origin and stellardestruction of the light elements Li, Be, and B by observing Babundances in a unique population of halo stars which lack Be.Li is produced in the Big Bang and its abundance in halo starsconstrains primordial nucleosynthesis and the baryonicdensity. Be and B (and more Li) should be produced later bycosmic ray spallation as the galactic halo forms, and theevolution of Li, Be, and B is now being used along with thatof Fe/H and O/H as a powerful discriminant between differentmodels of the chemical and dynamical evolution of the galaxy.Light element abundances can be used to test the theoriesmentioned above only if they have not been altered bydestruction in the stars, and a number of respected theoristshave presented models which predict some destruction. We havefound 6 halo stars in which Be is missing or very weak. Fiveof these also have undetectable Li, but in one, Li is normal.Observing B in these stars should allow us to decide if isthis is clear evidence of stellar destruction. The case ofthe Li-normal, Be-weak star is especially interesting, sincethis cannot be due to known destruction mechanisms. They alldestroy more Be and B than Li (which burns at a lowertemperature). If B in that star is shown to have the samedeficiency as Be, it would be evidence of spatial variation ofelement production in the early galaxy.

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