Nucleosynthesis Modes in the High-Entropy-Wind Scenario of Type II Supernovae
- HGF Virtuelles Institut fuer Struktur der Kerne und Nukleare Astrophysik (VISTARS), D-55128 Mainz (Germany)
- Homer L. Dodge Department of Physics and Astronomy University of Oklahoma, Norman, OK73019 (United States)
- Institute of Astronomy, Russian Academy of Science, RU-119017 Moscow (Russian Federation)
- Department of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712 (United States)
- Departement fuer Physik und Astronomie, Universitaet Basel, CH-4056 Basel (Switzerland)
- Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL60637 (United States)
In an attempt to constrain the astrophysical conditions for the nucleosynthesis of the classical r-process elements beyond Fe, we have performed large-scale dynamical network calculations within the model of an adiabatically expanding high- entropy wind (HEW) of type II supernovae (SN II). A superposition of several entropy-components (S) with model-inherent weightings results in an excellent reproduction of the overall Solar System (SS) isotopic r-process residuals (N{sub r,{center_dot}}), as well as the more recent observations of elemental abundances of metal-poor, r-process rich halo stars in the early Galaxy. For the heavy r-process elements beyond Sn, our HEW model predicts a robust abundance pattern up to the Th, U r-chronometer region. For the lighter neutron-capture region, an S-dependent superposition of (i) a normal {alpha}-component directly producing stable nuclei, including s-only isotopes, and (ii) a component from a neutron-rich {alpha}-freezeout followed by the rapid recapture of {beta}-delayed neutrons ({beta}dnrpar; emitted from the far-unstable seed nuclei is indicated. In agreement with several recent halo-star observations in the 60<A<110 region, our HEW model confirms a Z-dependent non-correlation, respectively partial correlation with the heavier 'main' r-process elements.
- OSTI ID:
- 21136980
- Journal Information:
- AIP Conference Proceedings, Vol. 990, Issue 1; Conference: 1. stars II conference, Santa Fe, NM (United States), 15-20 Jul 2007; Other Information: DOI: 10.1063/1.2905568; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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