期刊
ASTROPHYSICAL JOURNAL
卷 797, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/797/2/123
关键词
Galaxy: evolution; Galaxy: stellar content; nuclear reactions, nucleosynthesis, abundances; stars: abundances; supernovae: general
资金
- German Research Foundation (DFG) [Sonderforschungsbereich SFB 881]
- VILLUM Foundation
- Joint Institute for Nuclear Astrophysics at MSU under NSF [08-22648]
- Helmholtz-University [VH-NG-825]
Abundances of low-metallicity stars offer a unique opportunity to understand the contribution and conditions of the different processes that synthesize heavy elements. Many old, metal-poor stars show a robust abundance pattern for elements heavier than Ba, and a less robust pattern between Sr and Ag. Here we probe if two nucleosynthesis processes are sufficient to explain the stellar abundances at low metallicity, and we carry out a site independent approach to separate the contribution from these two processes or components to the total observationally derived abundances. Our approach provides a method to determine the contribution of each process to the production of elements such as Sr, Zr, Ba, and Eu. We explore the observed star-to-star abundance scatter as a function of metallicity that each process leads to. Moreover, we use the deduced abundance pattern of one of the nucleosynthesis components to constrain the astrophysical conditions of neutrino-driven winds from core-collapse supernovae.
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