Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7763m&link_type=abstract
HST Proposal ID #7763
Other
Hst Proposal Id #7763 Stellar Ejecta
Scientific paper
Young supernova remnants are excellent laboratories for investigating how stars make elements, and the Crab Nebula can provide unique information about the supernova process and associated heavy element production. Existing evidence indicates that the progenitor star initially contained 9-11 solar masses. Some calculations suggest that oxygen burning does not take place in such stars, whereas other models support off-center ignition of oxygen. It is important to determine how far the nuclear reactions progressed and to know whether the nebular gas is significantly contaminated by products of oxygen burning, such as sulfur. In conjunction with an optical and theoretical investigation of regions showing unusually strong [S II] 6716, 6731 lines, a simple test will be performed to determine whether this emission is a result of filament optical depth characteristics or of significantly increased sulfur abundance. In the former case, the intensities of the [S II] lines and Mg II 2798 would be directly correlated, whereas they would be strongly anticorrelated if products of oxygen burning are significantly enhanced in the nebula.
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