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

Publications of the Astronomical Society of Australia

Dominik Argast¹ 

[1] Markus Samland

关键词: nuclear reactions;    nucleosynthesis;    abundances;    stars: abundances;    ISM: abundances;    Galaxy: abundances;    Galaxy: evolution;    Galaxy: halo;   

DOI  :  10.1071/AS04021

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

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.

【 授权许可】

Unknown