2004/11/30 by E. F. del Peloso, L. da Silva, L. I. Arany-Prado · 4 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomical and nuclear sciences #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20042438
published as Astron.Astrophys. 434 (2005) 301 · 9 pages, 7 Postscript figures, accepted for publication in Astronomy & Astrophysics, final version
arxiv created 2005/02/21 · openalex publication_date 2005/04/01 · arxiv updated 2009/12/01 · openalex created_date 2022/10/01 · openalex updated_date 2026/07/31
The purpose of this work is to resume investigation of Galactic thin disk dating using nucleocosmochronology with Th/Eu stellar abundance ratios, a theme absent from the literature since 1990. [Th/Eu] abundance ratios for a sample of 20 disk dwarfs/subgiants of F5 to G8 spectral type with , determined in the first paper of this series, were adopted for this analysis. We developed a Galactic chemical evolution model that includes the effect of refuse, which are composed of stellar remnants (white dwarfs, neutron stars and black holes) and low-mass stellar formation residues (terrestrial planets, comets, etc.), contributing to a better fit to observational constraints. Two Galactic disk ages were estimated, by comparing literature data on Th/Eu production and solar abundance ratios to the model (), and by comparing [Th/Eu] vs. [Fe/H] curves from the model to our stellar abundance ratio data ((), yielding the final, average value . This is the first Galactic disk age determined via Th/Eu nucleocosmochronology, and corroborates the most recent white dwarf ages determined via cooling sequence calculations, which indicate a low age ( ≲ ) for the disk.