Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8693s&link_type=abstract
HST Proposal ID #8693
Computer Science
Hst Proposal Id #8693 Ism And Circumstellar Matter
Scientific paper
A specific nuclear process associated with core-collapse supernovae involves the inelastic scattering of neutrinos {produced as a result of the core collapse} off of abundant nuclei in the outer layers of the dying star. Two relatively low-abundance elements, boron and fluorine, have been suggested to owe some uncertain fraction of their cosmic abundances to this process. In the case of boron, the dominant isotope is ^11B, and neutrinos interacting with ^12C can lead to its synthesis. Fluorine-19 is the only stable F isotope and it can be produced by neutrino scattering removing a proton from ^20Ne. Competing processes can also synthesyze these elements: cosmic-ray spallation reactions for B and shell He-burning in AGB stars for F. In order to gauge the importance of neutrino nucleosynthesis in the chemical evolution of the Galaxy, we will use HST with STIS to determine interstellar B and O abundances in the gas associated with the Cep OB2 association {using the B II 1362Angstrom and O I 1356Angstrom lines}. These results will be combined with observations of interstellar F I along the same lines-of-sight obtained with FUSE {fluorine can only be compared directly to boron using interstellar lines and interstellar F is only observable with FUSE}. The derived F/O and F/B ratios in Cep OB2 will allow us to determine the relative importance of neutrino nucleosynthesis to the origins of B and F.
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