Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-27T07:12:16.741Z Has data issue: false hasContentIssue false
  • English
  • Français

The age of the Galactic thin disk from Th/Eu nucleocosmochronology: extended sample

Published online by Cambridge University Press:  23 December 2005

Eduardo F. del Peloso ,
Licio da Silva ,
Gustavo F. Porto de Mello  and
Lilia I. Arany-Prado
Eduardo F. del Peloso
Affiliation:
Observatório Nacional/MCT, 20921-400 Rio de Janeiro, RJ, Brazil email: [email protected], [email protected] Observatório do Valongo/UFRJ, 20080-090 Rio de Janeiro, RJ, Brazil email: [email protected], [email protected]
Licio da Silva
Affiliation:
Observatório Nacional/MCT, 20921-400 Rio de Janeiro, RJ, Brazil email: [email protected], [email protected]
Gustavo F. Porto de Mello
Affiliation:
Observatório do Valongo/UFRJ, 20080-090 Rio de Janeiro, RJ, Brazil email: [email protected], [email protected]
Lilia I. Arany-Prado
Affiliation:
Observatório do Valongo/UFRJ, 20080-090 Rio de Janeiro, RJ, Brazil email: [email protected], [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We report the determination of the age of the Galactic thin disk by means of Th/Eu nucleocosmochronology. This method is only weakly dependent on stellar evolutions models, therefore allowing an important verification of the most used dating techniques, which are the fitting of isochrones to the oldest Galactic open clusters, and the calculation of white dwarf cooling sequences. This work builds upon our previous determination (del Peloso et al. 2005a, 2005b), by including 7 new objects to the sample which was originally composed of 19 disk dwarfs/subgiants of F5 to G8 spectral types – a 37% extension. The obtained result, (8.8±1.7)Gyr, corroborates the most recent white dwarf ages determined via cooling sequence calculations, which indicate a low age ($\widetilde{<}10~\mbox{Gyr}$) for the disk.

Keywords

Galaxy: diskGalaxy: evolutionstars: late-typestars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 485 - 486
Copyright
© 2005 International Astronomical Union