Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6073d&link_type=abstract
HST Proposal ID #6073
Physics
Hst Proposal Id #6073 Hot Stars
Scientific paper
Early-type stars are excellent probes of the current chemicalcomposition of our own and external galaxies. Main sequence starsare particularly useful as the physics of their atmospheres arewell understood, while their surfaces should be unaffected bythe products of interior nuclear reactions. We have used suchtargets to map the chemical composition of our galaxy and toprovide accurate abundances for the SMC and LMC. Our attemptsto determine the chemical composition of the Magellanic Bridgehave been less successful despite generous allocations of 4mtelescope time. This has been principally because of theabsence of optical metal absorption lines due to the largemetal depletion of the Bridge material and for some elements(e.g. iron) the intrinsic weakness of their optical spectra.Here we propose ultra-violet observations of a B0V Bridgestar, DI 1388, which should provide reliable abundances ofboth the lighter (e.g. carbon and nitrogen) and heavier metals(e.g. silicon and iron). The HST observations will besupplemented by our existing (and possible additional) AAThigh resolution echelle spectra. Non-LTE model atmosphereanalyses of the optical hydrogen and hydrogen lines will beused to estimate atmospheric parameters, which will then formthe basis for non-LTE analyses of the ultra-violet spectra.Using differential methods, abundances accurate to 0.1-0.2 dexshould be achievable, which will constrain the origin andevolutionary history of this material.
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