Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8161v&link_type=abstract
HST Proposal ID #8161
Computer Science
Hst Proposal Id #8161 Hot Stars
Scientific paper
Observations of boron abundances in the Magellanic Clouds will provide a novel test of the assertion that boron is produced primarily through spallation reactions between cosmic rays and ambient interstellar nuclei. The lower metallicities and especially the lower cosmic ray flux of the Small Magellanic Cloud, as inferred from Gamma-ray observations, imply that, if spallation is the dominant production mechanism, boron should be significantly underabundant in the Clouds relative to its local Galactic value. Only spectroscopy from space can provide the necessary boron abundances. In this proposal, we are requesting HST STIS observations to detect the B III resonance lines in one LMC and two SMC main-sequence B stars. Only STIS can observe these NUV lines, especially with the resolution and S/N required for reliable boron abundance determinations. The main-sequence stars selected for this project show no signs of stellar mixing {which could destroy B}, thus they can be used to determine an accurate, present- day, boron abundance. This abundance will be compared with that predicted by simple models of galactic chemical evolution using the inferred cosmic ray fluxes and interstellar abundances of target nuclei.
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