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Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8244w&link_type=abstract
HST Proposal ID #8244
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Hst Proposal Id #8244 Stellar Ejecta
Scientific paper
The remnant of SN 1006 provides a unique opportunity to study ejecta from a Type Ia supernova through UV absorption spectroscopy. Absorption lines in the spectrum of the background Schweizer-Middleditch {SM} star have revealed the presence of cold Fe and Si with velocities up to 7000kms. These lines surely are due to ejecta, but extrapolation from a single line of sight to the entire remnant suggests a mass of Fe less than half the 0.5: Msun expected from a Type Ia supernova. A reliable inventory of the ejecta requires several such ``core samples'' through the remnant, but until now no other suitable background UV sources had been identified. A recent search has revealed four new background objects with which we propose to probe additional lines of sight through SN 1006: two quasars and two A0 stars. These are fortuituously well distributed about the 30' diameter shell--from only 2' away from the center {even closer than the SM star} to <=sssim 1' from the shell rim. In modest exposures with th e STIS we can obtain low-resolution spectra in both the near- and far-UV which will lead to a much fuller picture of the ejecta distribution and address the following questions: {1} Are the ejecta in diffuse expanding shells, or fragmented? In stratified layers, or mixed? {2} Where is the reverse shock which reheats the ejecta located? {3} Can the ``missing'' Fe from the Type Ia supernova be accounted for?
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