Statistics – Computation
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..587j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. 587-594. Research supported by the University of Vir
Statistics
Computation
15
Nuclear Fusion, Stellar Composition, Stellar Evolution, Supermassive Stars, Supernova Remnants, Supernovae, Abundance, Cassiopeia A, Computational Astrophysics, Hydrodynamic Equations, Shock Waves, Stellar Models, Stellar Structure
Scientific paper
If the ejecta of a Type II supernova do not undergo extensive mixing, then, based on the explosion of current presupernova models, only a small fraction approximately equal to or less than 0.1 solar mass of the mantle of a massive star can yield abundances similar to those observed in the fast-moving knots of Cas A. This is shown to be independent of the detailed structure of the mantle and the supernova energy. Lack of mixing in Cas A is indicated by strong upper limits on the abundance ratios Ne/O, and Fe/O. If this is confirmed by further observations, then either Cas A is not the result of a standard progenitor of approximately equal to or less than 25 solar masses disrupted by a Type II supernova, or the picture of the last stages of stellar evolution in massive stars needs to be modified substantially.
Johnston Matthew D.
Yahil Amos
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