Statistics – Computation
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.0710f&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #07.10; Bulletin of the American Astronomical Society, Vol. 28, p.833
Statistics
Computation
Scientific paper
We derived the (11) B/(10) B ratio along the sight lines toward two stars, kappa Ori and delta Sco, from spectra acquired with the Goddard High Resolution Spectrograph on HST. These interstellar ratios, which are the first determinations beyond the Solar System, were based on analysis of absorption from the weak resonance line of B II at 1362 Angstroms. The interstellar value obtained from our analysis is similar for the two sight lines -- namely, 4 +/- 1. The interstellar value agrees with the boron isotope ratio of 4.05 +/- 0.05 for the Solar System. Our findings are consistent with detailed models of light element nucleosynthesis, which include the effects of spallation from cosmic ray protons on interstellar CNO, from enhanced fluxes of low energy C and O nuclei on interstellar protons, and from neutrinos on (12) C during a supernova explosion. Particular models predict a constant isotope ratio from the time the Solar System formed to the present. Furthermore, our analysis of the B II line yielded an isotope shift of 13.7 +/- 3.5 m Angstroms which agrees with the shift of 13.3 m Angstroms obtained from large-scale quantal computations.
Cardelli Jason A.
Federman Steven Robert
Lambert David L.
Sheffer Yaron
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