Convection, nucleosynthesis, and core collapse

Grant Bazan, David Arnett

Research output: Contribution to journalArticle

68 Scopus citations

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 (12C) into the convective regon, causing hot spots of nuclear burning. Plumes dominate the velocity structure. Finite perturbations arise in a region in which 16O will be explosively burned to 56Ni when the star explodes; the resulting instabilities and mixing are likely to distribute 56Ni throughout the supernova envelope. Inhomogeneities in Ye may be large enough to affect 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.

Original languageEnglish (US)
Pages (from-to)L41-L43
JournalAstrophysical Journal
Volume433
Issue number1 PART 2
StatePublished - Sep 20 1994

    Fingerprint

Keywords

  • Convection
  • Hydrodynamics
  • Nuclear reactions, nucleosynthesis, abundances
  • Stars: abundances
  • Stars: evolution
  • Supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this