Other
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9886b&link_type=abstract
HST Proposal ID #9886
Other
Hst Proposal Id #9886 Cool Stars
Scientific paper
Dramatic deficiencies of Li in the mid-F stars of the Hyades were discovered by Boesgaard and Tripicco in 1986. Using ultraviolet, high-resolution spectra from the Keck 10-m telescope, Boesgaard and King have just discovered the corresponding deficiencies in Be in the same narrow temperature region in the Hyades. We propose a precision investigation into the B abundance in the Hyades F stars to ascertain if there is a B dip. Boron can only be observed with HST and we plan to use the resonance line of B I at 2497A. Each of these three light elements is destroyed inside stars, but each has a different threshold temperature: 2.5 x 10^6, 3.5 x 10^6, and 5 x 10^6 K for Li, Be, and B respectively. Consequently, these elements survive to increasingly greater depths in a star and their surface abundances act as a report on the depth and thoroughness of mixing in the star. The mixing mechanism in F stars is slow mixing, but not straight convective mixing. These observations will help determine the nature of the mixing mechanism{s}, and the connection to stellar rotation. The abundance of *all three* light elements in a cluster ofknown age and metallicity provides the necessary information to discern the internal stellar processes. This mixing must be occurring in other stars of this mass range { 10-25% more massive than the sun} and can best be studied in a cluster of stars of common origin and known characteristics. The Hyades cluster at 7 x 10^8 yr is close enough to contain stars bright enough for this investigation.
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