Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6020k&link_type=abstract
HST Proposal ID #6020
Physics
Hst Proposal Id #6020 Interstellar Medium
Scientific paper
This is a continuation of our large, long-term project on supernovae, approved by the Cycle 4 TAC for Cycles 5 and 6. Supernovae create the chemical history of the universe, energize the interstellar gas, and are central to efforts to measure the extragalactic distance scale. Our approach is intensive study of a few objects, such as SN 1987A, SN 1992A, SN 1993J in M81, and SN 1994I in M51. Our 1987A observations include images of the debris and the circumstellar rings, the UV spectrum of the supernova and the circumstellar matter. We have used the HST effectively to obtain unique UV spectra and images of bright supernovae in our target-of-opportunity studies. We propose to continue this work in Cycle 5: monitoring the continuing evolution of SN 1987A as the debris nears the ring, scrutinizing the very late-time emission of objects we have observed near maximum light {including a probable light echo}, and employing HST for the prompt study of a newly-discovered supernova during Cycle 5. Although we have examined some fascinating objects, the best is yet to come- we have not yet observed a classic Type II supernova, or a representative member of the SN Ib class, the two types which promise to be most interesting in the UV
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