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The chemical abundances of the Cassiopeia A fast-moving knots - Explosive nucleosynthesis on a minicomputer

Johnston, M. D. ; Joss, P. C.

Astrophys. J.; (United States), 1980-12, Vol.242, p.1124 [Periódico revisado por pares]

United States

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Título:
The chemical abundances of the Cassiopeia A fast-moving knots - Explosive nucleosynthesis on a minicomputer
Autor: Johnston, M. D. ; Joss, P. C.
Assuntos: 640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources ; ABUNDANCE ; CHEMICAL COMPOSITION ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; COMPUTERIZED SIMULATION ; COSMIC RADIO SOURCES ; ERUPTIVE VARIABLE STARS ; NEBULAE ; NUCLEAR REACTIONS ; NUCLEOSYNTHESIS ; NUMERICAL SOLUTION ; SIMULATION ; STAR EVOLUTION ; STARS ; SUPERNOVA REMNANTS ; SUPERNOVAE ; VARIABLE STARS
É parte de: Astrophys. J.; (United States), 1980-12, Vol.242, p.1124
Descrição: We describe a simplified nuclear reaction network for explosive nucleosynthesis calculations, in which only the most abundant species and the most important reactions linking these species are considered. This scheme permits the exploration of many cases without excessive computational effort. We obtain good agreement with previous calculations employing more complex reaction networks. We apply this scheme to the observed chemical abundances of the fast-moving knots in the supernova, remant Casiopeia A and find that a wide range of initial conditions could yield the observed abundances. The abundances of four of the knots with significant and different amounts of elements heavier than oxygen are consistent with an origin in material of the same initial composition but processed at different peak temperatures and densities. Despite the observed high oxygen abundances and low abundances of light (A< or =14) elements in the knots, they did not necessarily undergo incomplete ooxygen burning; in fact , it is not even necessary that xygen have been present in the initial composition. The agreement between the calculated and observed chemical abundances in Cas A and similar supernova remnants depends primarily upon the relevant nuclear physics and does not provide strong evidence in favor of any particular model of the supernova event.
Editor: United States
Idioma: Inglês

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The chemical abundances of the Cassiopeia A fast-moving knots - Explosive nucleosynthesis on a minicomputer

Johnston, M. D. ; Joss, P. C.

United States

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