Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8241l&link_type=abstract
HST Proposal ID #8241
Physics
Hst Proposal Id #8241 Interstellar And Intergalactic Matter
Scientific paper
We propose to obtain SNAPSHOT high-resolution STIS echelle observations of the interstellar absorption lines between 1170 and 1372 Angstroms towards a sample of stars with known UV fluxes. By taking advantage of the SNAPSHOT observing mode we will efficiently obtain large numbers of spectra of O and B-type stars for ISM studies. Our goals are to explore the homogeneity of the ISM on large scales and to conduct a census of high-velocity clouds. The selected wavelength range contains numerous interstellar absorption lines which enable us to measure the physical properties {density, temperature, depletions} in individual components. By taking advantage of differential Galactic rotation we can probe clouds as a function of Galactic radius, and differentiate between various models for interstellar enrichment. High-velocity clouds can provide significant information on the structure and evolution of interstellar shocks, the transfer of energy from stars to the ISM, and the destruction of interstellar dust grains. This dataset will provide information on the space density and cross-sections of HVCs in the Galactic disk.
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