Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8145w&link_type=abstract
HST Proposal ID #8145
Physics
Hst Proposal Id #8145 Interstellar And Intergalactic Matter
Scientific paper
We propose to obtain high-resolution UV spectra of one star in the SMC, as part of a detailed study of the interstellar medium in and toward the Magellanic Clouds -- nearby systems of low metallicity and low dust-to-gas ratio for which stellar abundance data are also available. We will use the STIS echelle modes to obtain absorption-line profiles for species such as C I, Mg I, N I, O I, S II, Zn II, Mg II, Si II, Cr II, Mn II, Fe II, and Ni II. These UV spectra will be used, together with optical spectra of Na I, K I, and Ca II obtained at higher resolution and/or S/N ratio and with far-UV spectra obtained with FUSE, to determine accurate abundances, pressures, temperatures, densities, and radiation fields for both neutral and ionized clouds in the SMC and Galactic disk and halo. Determining detailed abundances/depletions {for many elements} and local physical conditions for diverse environments in our Galaxy and in the Magellanic Clouds will aid in understanding the absorption-line systems seen toward distant QSO's.
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