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• W1763102161 abstract "We combine the estimated metallicities [Fe/H], abundances [alpha/Fe], positions and motions of a sample of 27,500 local (7<R/kpc<9, 0.5<|z|/kpc<2.5) SDSS/SEGUE G-type dwarf stars to investigate the chemo-orbital properties of the Milky Way's disk around the Sun. When we derive the orbital properties reflecting angular momentum, circularity, and thickness as function of [alpha/Fe] vs. [Fe/H], we find that there is a smooth variation with [alpha/Fe], a proxy for age. At the same time, the orbital properties of the old stars with [alpha/Fe]$gtrsim$0.25 do show a transition with [Fe/H]: below [Fe/H]$simeq$-0.6 the orbital angular momentum decreases, and the orbits become significantly non-circular and thicker. Radial migration of stars into the Solar neighborhood would naturally result in a smooth variation in the orbital properties, but the latter old metal-poor stars form a clear challenge, in particular because a basic feature of radial migration is that stars remain on near-circular orbits. When we next select stars on near-circular orbits, we indeed find besides the alpha-young 'thin-disk' stars a significant contribution to the alpha-old 'thick-disk' metal-rich stars. However, the remaining alpha-old 'thick-disk' stars on eccentric orbits, including nearly all old metal-poor stars, are difficult to explain with radial migration alone, but might have formed through early-on gas-rich mergers. We thus find chemo-orbital evidence that the thicker component of the Milky Way disk is not distinct from the thin component as expected from smooth internal evolution through radial migration, except for the old metal-poor stars with different orbital properties which could be part of a distinct thick-disk component formed through an external mechanism." @default.
• W1763102161 created "2016-06-24" @default.
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• W1763102161 date "2012-08-27" @default.
• W1763102161 modified "2023-10-16" @default.
• W1763102161 title "Chemo-orbital evidence from SDSS/SEGUE G-type dwarf stars for a mixed origin of the Milky Way's thick disc" @default.
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• W1763102161 doi "https://doi.org/10.1111/j.1365-2966.2012.21551.x" @default.
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