PRODUCTION OF LIGHT-ELEMENT PRIMARY PROCESS NUCLEI IN NEUTRINO-DRIVEN WINDS

Journal Article · Sun Apr 10 00:00:00 EDT 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/731/1/5· OSTI ID:21574801

Arcones, A ^[1]; Montes, F ^[2]

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1. Institut fuer Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt (Germany)
2. Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824 (United States)

We present first comparisons between light-element primary process (LEPP) abundances observed in some ultra metal-poor (UMP) stars and nucleosynthesis calculations based on long-time hydrodynamical simulations of core-collapse supernovae and their neutrino-driven wind. UMP star observations indicate that Z {>=} 38 elements include the contributions of at least two nucleosynthesis components: r-process nuclei that are synthesized by rapid neutron capture in a yet unknown site and LEPP elements (mainly Sr, Y, and Zr). We show that neutrino-driven wind simulations can explain the observed LEPP pattern. We explore in detail the sensitivity of the calculated abundances to the electron fraction, which is a key nucleosynthesis parameter but poorly known due to uncertainties in neutrino interactions and transport. Our results show that the observed LEPP pattern can be reproduced in proton- and neutron-rich winds.

• OSTI ID: 21574801
• Journal Information: Astrophysical Journal, Vol. 731, Issue 1; Other Information: DOI: 10.1088/0004-637X/731/1/5; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABUNDANCE
ELECTRONS
GALAXIES
NEUTRINOS
NEUTRON REACTIONS
NUCLEOSYNTHESIS
R PROCESS
SIMULATION
SUPERNOVAE
WIND
BARYON REACTIONS
BINARY STARS
ELEMENTARY PARTICLES
ERUPTIVE VARIABLE STARS
EVOLUTION
FERMIONS
HADRON REACTIONS
LEPTONS
MASSLESS PARTICLES
NUCLEAR REACTIONS
NUCLEON REACTIONS
STAR EVOLUTION
STARS
SYNTHESIS
VARIABLE STARS