Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5862l&link_type=abstract
HST Proposal ID #5862
Computer Science
Hst Proposal Id #5862 Cool Stars
Scientific paper
We propose to derive the boron abundances in two very metal- deficient stars (-2.4>=[Fe/H]>=-2.9) by observing the B I 2496.7 A line with the G270M/SSA configuration. The abundances will be computed under NLTE conditions. Both stars have also accurate determinations of lithium (including 6Li for one of them), beryllium and oxygen abundances, which will allow us to compute and interpret the abundance ratios between these elements. The available data for the star HD140283 ([Fe/H]=-2.7), for which an accurate NLTE boron abundance has been derived, seem to favour the hypothesis that boron and beryllium in Population II stars were produced by cosmic ray induced spallation reactions and not by inhomogeneous big bang nucleosynthesis. These new observations, which include what is probably the most metal-poor unevolved star known for which boron can be measured with HST, together with the results obtained for HD140283, will be the most useful diagnostic used up to now to precisely constrain the different mechanisms proposed as responsible for the light element production in the early Galaxy.
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