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Tracing the Galactic Thick Disk to Solar Metallicities

T. Bensby, A.R. Zenn, M.S. Oey, & S. Feltzing

We show that the Galactic thick disk reaches at least solar metallicities and that it experienced strong chemical enrichment during a period of 3 Gyr, ending around 89 Gyr ago. This finding puts further constraints on the relation and interface between the thin and thick disks and their formation processes. Our results are based on a detailed elemental abundance analysis of 261 kinematically selected F and G dwarf stars in the solar neighborhood: 194 likely members of the thick disk and 67 likely members of the thin disk, in the range -1.3 < [Fe/H] < +0.4.

ApJ Letters, 663, L13

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  • astro-ph/0705.2060
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