Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8112s&link_type=abstract
HST Proposal ID #8112
Computer Science
Hst Proposal Id #8112 Interstellar And Intergalactic Matter
Scientific paper
We propose a Target of Opportunity program to obtain STIS echelle spectra of a bright new supernova {V<14} to characterize the ionization state, gas-phase abundances, depletion on dust grains, metallicity, and gas kinematics in the Galactic halo, the ISM and halo of the SN's host galaxy, and, if the properties of the sightline are favorable, in the intervening intergalactic medium. The principal spectral region for this study is the far ultraviolet {1200-1700A}, which provides a comprehensive set of lines to study the hot, warm, and cool phases of the ISM. Near-UV spectra will provide Zn II and Cr II line profiles with which to assess gas-phase depletion. New core-collapse supernovae, with their strong, nearly featureless UV continua, provide outstanding opportunities to obtain high-quality absorption line spectra of the gas on the line of sight to the SN, but only if the observations are executed within 2 weeks of outburst. Our team has the experience and extensive ground-based support to rapidly assess the suitability of each newly-discovered supernova for this program and provide all the necessary data to efficiently implement the proposed observations, as demonstrated by our successful STIS low resolution UV spectra of SN 1998S in Cycle 7.
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