Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7349h&link_type=abstract
HST Proposal ID #7349
Other
Hst Proposal Id #7349 Stellar Ejecta
Scientific paper
The ejecta of the remnant of the Type Ia Supernova 1006 can be studied in a unique way, through the broad, high velocity absorption features it causes in the spectrum of an OB subdwarf star fortuitously located behind the remnant. We propose far UV echelle spectroscopy, with STIS E140M, of this OB subdwarf, and also of the subwarf PG 0839+399 to provide a comparable stellar template spectrum. The intent is to obtain detailed line profiles, at a resolution 30 times that of the existing FOS spectra, of the redshifted { +6000 kmps} Si II 1260, 1304 and 1527 Angstrom, Si III 1206 Angstrom, and Si IV 1400 Angstrom absorption features caused by silicon ejecta in SN1006. The scientific goals are: {1} to determine how sharp is the red edge {at +7070 kmps} on the strong Si II 1260 Angstrom absorption feature, and thereby to test the hypothesis that this edge represents the free expansion velocity of the reverse shock; {2} to resolve the discrepancies in the FOS spectrum between the Si II 1260, 1304 and 1527 Angstrom line profiles, which may be caused by stellar features; {3} to compare the line profiles and column densities of Si II, Si III, and Si IV, which reveal the mass and distribution of silicon in the ejecta, and which constrain models for the shocked and unshocked ejecta; {4} to place constraints on the presence of other high velocity absorption, notably blue-shifted Si IV 1400 Angstrom, which is expected at a low level.
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