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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*
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
*
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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.

Type
Research Article
Copyright
Copyright © Astronomical Society of Australia 2004

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