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Constraints on the Astrophysical Nature of r-Process Nucleosynthesis Sites from Inhomogeneous Chemical Evolution Models

Published online by Cambridge University Press:  05 March 2013

Dominik Argast  and
Markus Samland
Dominik Argast*
Affiliation:
Institut für Physik Universität Basel, CH 4056 Basel, Switzerland Astronomisches Institut Universität Basel, CH 4102 Binningen, Switzerland
Markus Samland
Affiliation:
Astronomisches Institut Universität Basel, CH 4102 Binningen, Switzerland
*
3E-mail: argast@quasar.physik.unibas.ch
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Abstract

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We present a detailed inhomogeneous chemical evolution study that considers for the first-time neutron star mergers as major r-process sources, and compare this scenario with the ones in which lower-mass (in the range 8–10 M⊙) or higher-mass core-collapse supernovae (with masses ≥20 M⊙) act as dominant r-process sites. We conclude that it is not possible at present to distinguish between the lower-mass and higher-mass supernovae scenarios within the framework of inhomogeneous chemical evolution. However, neutron-star mergers seem to be ruled out as the dominant r-process source, since their low rates of occurrence would lead to r-process enrichment that is not consistent with observations.

Keywords

nuclear reactions, nucleosynthesis, abundancesstars: abundancesISM: abundancesGalaxy: abundancesGalaxy: evolutionGalaxy: halo
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Issue 2: The Fifth Workshop on Galactic Chemodynamics , 2004 , pp. 161 - 166
Copyright
Copyright © Astronomical Society of Australia 2004

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