How many nucleosynthesis processes exist at low metallicity?

• Verfasst von: Hansen, Camilla Juul [VerfasserIn]
• Verfasst von: Montes, Fernando [VerfasserIn]
• Verfasst von: Arcones Segovia, Almudena [VerfasserIn]
• Titel: How many nucleosynthesis processes exist at low metallicity?
• Verf.angabe: C.J. Hansen, F. Montes, and A. Arcones
• E-Jahr: 2014
• Jahr: 2014 December 8
• Umfang: 13 S.
• Fussnoten: Gesehen am 20.10.2020
• Titel Quelle: Enthalten in: The astrophysical journal / 1
• Ort Quelle: London : Institute of Physics Publ., 1996
• Jahr Quelle: 2014
• Band/Heft Quelle: 797(2014,2) Artikel-Nummer 123, 13 Seiten
• ISSN Quelle: 1538-4357
• DOI: doi:10.1088/0004-637X/797/2/123
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1736032410

Abstract

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.