Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4315f&link_type=abstract
HST Proposal ID #4315
Other
Hst Proposal Id #4315
Scientific paper
The interaction of a supernova (SN) shock wave with the remnants of the stellar wind of the progenitor can sometimes provide enough energy to sustain the SN luminosity for several years. Optical data, supplemented with radio and X-ray observations, of certain Type II SNe a few years past explosion strongly favor such an interpretation over other possible energy sources, such as a pulsar or long-lived radioactive isotopes. The UV spectrum is a powerful diagnostic for probing the conditions in the shock and the shocked material. We propose to observe SN 1988Z, the brightest and most recent member of this group. Due to its extensive radio and optical data records, it is particularly suited for an investigation of the interaction between ejecta and circumstellar gas. FOS spectra will be obtained. The UV fluxes will be used to test theoretical models of the interaction; the C IV line is predicted to be 3 times the strength of H-alpha, which will be measured from the ground. Optical and near-UV (UBVRI) images will be obtained with the PC to determine background contamination corrections for previous ground-based photometry, to measure accurate current magnitudes, and to investigate the local stellar population near the SN. HST observations of this object will shed light on the physical characteristics of its shock, as well as on the mass-loss history of its progenitor star.
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