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Titolo:
Further adventures: Oxygen burning in a convective shell
Autore:
Asida, SM; Arnett, D;
Indirizzi:
Univ Arizona, Steward Observ, Tucson, AZ 85721 USA Univ Arizona Tucson AZUSA 85721 na, Steward Observ, Tucson, AZ 85721 USA
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 1, volume: 545, anno: 2000,
parte:, 1
pagine: 435 - 443
SICI:
0004-637X(200012)545:1<435:FAOBIA>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERNAL GRAVITY-WAVES; AGB STARS; 2-DIMENSIONAL HYDRODYNAMICS; TURBULENT CONVECTION; STELLAR EVOLUTION; OVERSHOOT; NUCLEOSYNTHESIS; COLLAPSE; MODEL;
Keywords:
convection; methods : numerical; nuclear reactions, nucleosynthesis, abundances; supernovae : general;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Asida, SM Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 usalem, Israel
Citazione:
S.M. Asida e D. Arnett, "Further adventures: Oxygen burning in a convective shell", ASTROPHYS J, 545(1), 2000, pp. 435-443

Abstract

Two-dimensional hydrodynamical simulations of a convective oxygen burning shell in the presupernova evolution of a 20 M-. star are extended to later times. We used the VULCAN code to simulate longer evolution times than previously possible. Our results conDrm the previous work of & Baza`n Arnett over their time span (400 s). However, at 1200 s we could identify a new steady state that is significantly different from the original one-dimensional model. There is considerable overshooting at both the top and bottom boundaries of the convection zone. Beyond the boundaries, the convective velocityfalls off exponentially, with excitation of internal modes. The resulting mixing greatly affects the evolution of the simulations. Connections with other works of simulation of convection, in which such behavior is found in a different context, are discussed.

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Documento generato il 26/11/20 alle ore 07:56:43