Implications of the ""missing UV Opacity"" on Beryllium and Boron Abundance Determinations

Details Implications of the ""missing UV Opacity"" on Beryllium and Boron Abundance Determinations Implications of the ""missing UV Opacity"" on Beryllium and Boron Abundance Determinations

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7999b&link_type=abstract

HST Proposal ID #7999

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #7999 Stellar Astrophysics

Scientific paper

A persistent puzzle in our understanding of the UV stellar spectrum has been the inability of theoretical models to match the observed flux: the missing UV opacity problem. This lack of understanding inhibits our exploitation of the UV region; the study of stellar populations in external galaxies, the search for hot stars in crowded globular cluster cores, and most directly the derivation of important elemental abundances such as beryllium and boron with transitions only in the UV. We have recently addressed this problem in the Sun and devised an empirical scheme to quantify the missing opacity (Balachandran and Bell 1998). An important consequence of our finding has been that the solar beryllium abundance equals the meteoritic value and is not depleted as claimed by studies over the last 20 years. Our result strongly suggest that the extensive recent publications of beryllium and boron abundances based on GHRS data are systematically in error. Here we propose to use the GHRS archives to characterize the missing opacity as a function of temperature, metallicity and wavelength. We will then rederive boron abundances in key stars.

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