Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7301d&link_type=abstract
HST Proposal ID #7301
Physics
Hst Proposal Id #7301 Interstellar Matter
Scientific paper
It is proposed to carry out high-resolution UV spectroscopic observations of interstellar lines in the spectra of OB stars in the Carina Nebula, which will provide unique data on the ISM associated with star cluster formation. Data obtained in the visible at CTIO, and in the UV taken with IUE, demonstrate a rich spectrum of IS lines over a surprisingly wide range of velocities from -350 to +200 km/sec. These velocities are more typical of SNR gas, but in Carina it is possible they are sustained by stellar winds. The data obtained will be used to determine the physical conditions of the gas, establishing values for abundances, gas pressure, temperature, velocity, and depletion. Beyond the study of this remarkable region, the characterization of the ISM in these conditions will be useful in interpreting the spectra of starburst galaxies, galactic halos, and the spectra of distant quasars. The UV spectra obtained with IUE contain a large number of ionized species, but are not at sufficient resolution or S/N to unravel velocity splitting or line blends with stellar components for detailed abundance and depletion studies. This proposal takes advantage of STIS's capabilities to obtain high spectral resolution in the UV, and to include all the atomic species of interest in relatively few exposures.
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