Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8622l&link_type=abstract
HST Proposal ID #8622
Computer Science
Hst Proposal Id #8622 Ism And Circumstellar Matter
Scientific paper
The isotopic ratio 11B/10B will be determined for diffuse interstellar material along lines of sight to o Persei, 40 Persei, Zeta Persei, and X Persei that pass close to the star- forming region IC 348. High-resolution spectra of the Li I 6707A line toward o and Zeta Per show remarkably different isotopic ratios for lithium. Particularly striking is the ratio 7Li/6Li 3 for o Per while Zeta Per shows a quasi-solar { 10} ratio. The significance of the very low ratio for o Per is that it is essentially the value predicted for production by relativistic cosmic rays through spallation reactions; it is the only interstellar or stellar measurement that approaches this theoretical value. This discovery provides a novel opportunity to measure the isotopic B ratio of gas with a Li concentration dominated by spallation induced by relativistic cosmic rays. Feasibility of isotopic measurements has been demonstrated by our GHRS observations of the interstellar B II 1362A resonance line that provided the first extra-solar measurement of 11B/10B. Comparison of the observed and predicted isotopic B {and Li} ratios will test the relative importance of B synthesis by cosmic rays and Type II supernovae, and test proposals that invoke high-fluxes of high-energy particles in star-forming regions as major players in light element synthesis.
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