Tracing the Galactic thick disk to Solar metallicities

(2) Lund Observatory; Ann Arbor; A.R. Zenn (1); M.S. Oey (1); S. Feltzing (2) ((1) Dept. of Astronomy; Sweden); T. Bensby (1); University of Michigan; USA

arxiv: 0705.2060 · v1 · pith:4P6WQYJOnew · submitted 2007-05-15 · 🌌 astro-ph

Tracing the Galactic thick disk to Solar metallicities

T. Bensby (1) , A.R. Zenn (1) , M.S. Oey (1) , S. Feltzing (2) ((1) Dept. of Astronomy , University of Michigan , Ann Arbor , USA , (2) Lund Observatory

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keywords diskthicksolargalacticlikelymembersmetallicitiesthin

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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 8-9 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.

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Tracing the Galactic thick disk to Solar metallicities

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