Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6575f&link_type=abstract
HST Proposal ID #6575
Physics
Hst Proposal Id #6575 Interstellar Medium
Scientific paper
In this proposal I am asking for 10 orbits to obtain high-resolution GHRS echelle spectra of interstellar UV absorptionlines towards 2 stars located in the Galactic halo, HD119608 andHD167756. The analysis proposed for these data represents acontinuation of an investigation begun using GTO data by the P.I.and L. Spitzer. The unique combination of high spectral resolutionand high photometric precision available with the GHRS allow adetailed ``component analysis'' to be applied to the wide array ofUV absorption features present in the 1200-- 3000 Angstrom region.The goal of the program is to determine the physical properties ofindividual interstellar clouds in the halo, to provide a firmobservational foundation for theoretical models of the variousprocesses which shape the ISM in the halo. The particular issues Iwill focus on in analyzing these data are the elemental abundances& depletions in the halo clouds, the physical conditions(temperatures and n_e), the relationship between warm, ionized halogas and neutral gas, and the distributions of the highly-ionizedspecies relative the low ionization stage species. Results obtainedso far demonstrate the power of the GHRS data and this componentanalysis to address fundamental issues about the structure andorigin of the ISM.
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