The age of the Galactic thin disk from Th/Eu nucleocosmochronology II. Chronological analysis

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dc.creatordel Peloso, E. F.
dc.creatorda Silva, L.
dc.creatorArany-Prado, L. I.
dc.date2004-11-25
dc.date2005-02-21
dc.date.accessioned2026-07-07T02:16:02Z
dc.date.available2026-07-07T02:16:02Z
dc.descriptionThe 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 -0.8 <= [Fe/H] <= +0.3, 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 refuses, 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 ((8.7 +5.8-4.1) Gyr), and by comparing [Th/Eu] vs. [Fe/H] curves from the model to our stellar abundance ratio data ((8.2 +/- 1.9) Gyr), yielding the final, average value (8.3 +/- 1.8) Gyr. 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 (<~ 10 Gyr) for the disk.
dc.description9 pages, 7 Postscript figures, accepted for publication in Astronomy & Astrophysics, final version
dc.identifierhttps://arxiv.org/abs/astro-ph/0411699
dc.identifierhttp://arxiv.org/abs/astro-ph/0411699
dc.identifierAstron.Astrophys. 434 (2005) 301
dc.identifierdoi:10.1051/0004-6361:20042438
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8637
dc.subjectAstrophysics
dc.titleThe age of the Galactic thin disk from Th/Eu nucleocosmochronology II. Chronological analysis
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