Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12294b&link_type=abstract
HST Proposal ID #12294. Cycle 18
Physics
Scientific paper
Dramatic deficiencies of Li in the mid-F stars of the Hyades cluster werediscovered by Boesgaard and Tripicco in 1986. Using high-resolution, highsignal-to-noise spectra from the Keck 10-m telescope, Boesgaard and Kingdiscovered the corresponding deficiencies in Be in the same narrow temperatureregion in the Hyades. We propose an investigation into the B abundance in theHyades F stars to ascertain if there is also a B dip. Boron can only beobserved with HST; we plan to use the resonance line of B I at 2497 A. Eachof these three elements is destroyed inside stars, but at different depths.The threshold temperatures are 2.5 x 10^6, 3.5 x 10^6, and 5 x 10^6 K for Li,Be, B respectively. Consequently these elements survive to increasinglygreater depths in a star and their surface abundances act as a report on thedepth and thoroughness of mixing in the star. Although the mixing is slow, itis not straight convective mixing. These observations will help determine thenature of the mixing mechanism{s} and the connection to stellar rotation. Theabundance of *all three* light elements in a cluster of known age andmetallicity can provide the information needed to discern internal stellarprocesses. The Li and Be deficiencies occur in field and cluster stars inthis mass range {1.1 - 1.25 solar masses}, but the mechanisms can best bestudied in a cluster of stars of common origin and known characteristics. TheHyades cluster at 7 x 10^8 yr is close enough to contain stars bright enoughfor this investigation.;
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