PRODUCTION OF LIGHT-ELEMENT PRIMARY PROCESS NUCLEI IN NEUTRINO-DRIVEN WINDS
- Institut fuer Kernphysik, TU Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt (Germany)
- 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
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Related Subjects
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