SIMBAD references

2016ApJ...830...61F - Astrophys. J., 830, 61-61 (2016/October-3)

Dependence of the Sr-to-Ba and Sr-to-Eu ratio on the nuclear equation of state in metal-poor halo stars.


Abstract (from CDS):

A model is proposed in which the dependence on the equation of state (EOS) of the scatter of [Sr/Ba] in metal-poor stars is studied. Light r-process element enrichment in these stars has been explained via a truncated r-process, or "tr-process." The truncation of the r-process from a generic core-collapse event followed by a collapse into an accretion-induced black hole is examined in the framework of a galactic chemical evolution model. The constraints on this model imposed by observations of extremely metal-poor stars are explained, and the upper limits in the [Sr/Ba] distributions are found to be related to the nuclear EOS in a collapse scenario. The scatter in [Sr/Ba] and [Sr/Eu] as a function of metallicity has been found to be consistent with turbulent ejection in core-collapse supernovae. Adaptations of this model are evaluated to account for the scatter in isotopic observables. This is done by assuming mixing in ejecta in a supernova event. Stiff EOS are eliminated by this model.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): black hole physics - equation of state - nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: abundances

Simbad objects: 9

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