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

被引：163

作者：

Arcones, A. ^{[1
,2
,3
]}

Montes, F. ^{[4
,5
]}

机构：

[1] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[2] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany

[3] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[4] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA

[5] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 731卷 / 01期

基金：

瑞士国家科学基金会;

关键词：

Galaxy: abundances; nuclear reactions; nucleosynthesis; abundances; supernovae: general; METAL-POOR STARS; R-PROCESS NUCLEOSYNTHESIS; GIANT BRANCH STARS; HIGH-DISPERSION-SPECTROGRAPH; CORE-COLLAPSE SUPERNOVAE; CAPTURE ELEMENTS; EARLY GALAXY; POSTBOUNCE EVOLUTION; REACTION-RATES; ALPHA-PROCESS;

D O I：

10.1088/0004-637X/731/1/5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：11

共 72 条

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