Other
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2434w&link_type=abstract
HST Proposal ID #2434
Other
Hst Proposal Id #2434
Scientific paper
We propose to observe an sdOB star situated behind the young remnant of the type Ia SN 1006 in order to study the remnant's kinematic and chemical properties through absorption lines induced on the star's spectrum. Our exhaustive analysis of IUE data has firmly established that the star's UV spectrum exhibits broad FeII resonance line absorptions with radial velocity dispersions of approximately +/- 5000 km/s. Other broad, nonstellar features are tentatively identified as SII, SiII, SiIV, and OI resonance lines redshifted over the range 5200 to 6500 km/s. The UV absorption features provide a direct probe through this young SN Ia remnant, and thus a powerful test of theoretical SN models. However, the 17th mag star is at the limit of IUE capabilities, restricting detailed knowledge of the SNR's structure and composition. We propose FOS observations producing 10 to 20 better S/N and a 5-fold increase in resolution which will provide: 1) data on the density profile of the unshocked FeII core material, 2) a precise measurement of the reverse shock velocity, 3) insight into the nature of the O, Si and S 'knots', and 4) limits on the column density of enriched blueshifted ejecta.
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