Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3621w&link_type=abstract
HST Proposal ID #3621
Other
Hst Proposal Id #3621
Scientific paper
We propose to use the FOS to observe a 17th mag sdOB star situated behind the young remnant of the Type Ia SN 1006 in order to study the absorption spectrum of the SNR. IUE spectra show strong, broad Fe II UV absorption features, along with several Si, and possibly S and O lines redshifted by about 5000 km/sec. These features have provided the first direct observational evidence for high velocity, heavy element enriched ejecta within a young Type Ia SNR. In the first GO cycle, we were granted "high priority" HST time to observe the Fe II lines with the FOS (2200-2800 angstroms). Here, we request time to observe the Si II, III, IV, O I, S II, and possibly other lines which appear at shorter wavelengths (1200-1600 angstroms). These lines have been observed and reobserved by us with IUE, but the noisiness of the IUE spectra has made interpretation of features inevitably uncertain. The HST FOS spectrum will have about 10 times better S/N and 5 times better resolution which are essential to establish accurate profiles, equivalent widths, and wavelengths. Accurate HST measurements will: (1) confirm unambiguously the presence of partially burned heavy element material in SN 1006; and (2) provide firm evidence of the mass, composition, velocity distribution, and ionization state of this material. A rigorous and quantitative analysis of these features will substantially advance the understanding of Type Ia SN.
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