4.7 Article

Tracing the galactic thick disk to solar metallicities

期刊

ASTROPHYSICAL JOURNAL
卷 663, 期 1, 页码 L13-L16

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IOP PUBLISHING LTD
DOI: 10.1086/519792

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galaxy : disk; galaxy : evolution; galaxy : formation; solar neighborhood; stars : abundances; stars : kinematics

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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 similar to 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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