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The age of the Galaxy's thick disk

Published online by Cambridge University Press:  01 October 2008

Sofia Feltzing  and
Thomas Bensby
Sofia Feltzing
Affiliation:
Lund Observatory, Box 43, SE-22100, Lund, Sweden email: [email protected]
Thomas Bensby
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago, Chile email: [email protected]
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Abstract

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We discuss the age of the stellar disks in the solar neighborhood. After reviewing the various methods for age dating, we discuss current estimates of the ages of both the thin- and the thick disks. We present preliminary results for kinematically-selected stars that belong to the thin- as well as the thick disk. All of these dwarf and sub-giant stars have been studied spectroscopically and we have derived both elemental abundances as well as ages for them. A general conclusion is that in the solar neighborhood, on average, the thick disk is older than the thin disk. However, we caution that the exclusion of stars with effective temperatures around 6500 K might result in a biased view of the full age distribution for the stars in the thick disk.

Keywords

Galaxy: structureGalaxy: diskkinematics and dynamicssolar neighborhoodHertzsprung-Russell diagramstars: late-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S258: The Ages of Stars , October 2008 , pp. 23 - 30
Copyright
Copyright © International Astronomical Union 2009

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