Boron Isotope Ratios in Early B Stars from B III

Details Boron Isotope Ratios in Early B Stars from B III Boron Isotope Ratios in Early B Stars from B III

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6644p&link_type=abstract

HST Proposal ID #6644

Physics

Hst Proposal Id #6644 Hot Stars

Scientific paper

We propose to measure the ^11B/^10B ratio in the early Bstars HD 886 (Gamma Peg) and HD 35299, by obtaining very highsignal to noise ratio echelle-B spectra of the B IIIresonance line at 2066.8 Angstrom. Theoretical calculationspredict a 42 mA shift between the two isotopes, andboth synthetic spectra and high-dispersion IUE spectra showthat the line is present in both targets and is suitable formeasuring the isotope shift. The solar system ^11B/^10B ratioof 4:1 is considerably larger than the the canonicalpredictions of cosmic ray spallation theory (about 2.5:1).These observations will allow us to investigate whether or notthe solar system abundance ratio is universal among populationI stars, and will place new constraints on theories of ^11Bsynthesis.

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