The age of the Galaxy's thick disk

Details The age of the Galaxy's thick disk The age of the Galaxy's thick disk

2008-11-17

arxiv.org/abs/0811.2445v1

Astronomy and Astrophysics

Astrophysics

6 pages, contribution to IAU Symposium 258: The Ages of Stars, held in Baltimore, USA, October 13-17, 2008

Scientific paper

We discuss the age of the stellar disks in the solar neighbourhood. After reviewing the various methods for age dating we discuss current estimates of the age of both the thin and the thick disk. 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 neighbourhood, 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 on the full age distribution for the stars in the thick disk.

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