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Titolo:
CONVECTION, NUCLEOSYNTHESIS, AND CORE COLLAPSE
Autore:
BAZAN G; ARNETT D;
Indirizzi:
UNIV ARIZONA,STEWARD OBSERV TUCSON AZ 85721
Titolo Testata:
The Astrophysical journal
fascicolo: 1, volume: 433, anno: 1994,
parte:, 2
pagine: 120000041 - 120000043
SICI:
0004-637X(1994)433:1<120000041:CNACC>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
TURBULENT COMPRESSIBLE CONVECTION; SN-1987A;
Keywords:
CONVECTION; HYDRODYNAMICS; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; STARS, ABUNDANCES; STARS, EVOLUTION; SUPERNOVAE, GENERAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
G. Bazan e D. Arnett, "CONVECTION, NUCLEOSYNTHESIS, AND CORE COLLAPSE", The Astrophysical journal, 433(1), 1994, pp. 120000041-120000043

Abstract

We use a piecewise parabolic method hydrodynamics code (PROMETHEUS) to study convective burning in two dimensions in an oxygen shell prior to core collapse. Significant mixing beyond convective boundaries determined by mixing-length theory brings fuel (C-12) into the convective region, causing hot spots of nuclear burning. Plumes dominate the velocity structure. Finite perturbations arise in a region in which O-16 will be explosively burned to Ni-56 when the star explodes; the resulting instabilities and mixing are likely to distribute Ni-56 throughout the supernova envelope. Inhomogeneities in Y(e) may be large enough toaffect core collapse and will affect explosive nucleosynthesis. The nature of convective burning is dramatically different from that assumed in one-dimensional simulations; quantitative estimates of nucleosynthetic yields, core masses, and the approach to core collapse will be affected.

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Documento generato il 26/11/20 alle ore 09:03:13