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Two Populations of Carbon-Enhanced Metal-Poor Stars in the Disk System of the Milky Way

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arxiv 2012.03463 v2 pith:L2PVKNM4 submitted 2020-12-07 astro-ph.GA astro-ph.SR

Two Populations of Carbon-Enhanced Metal-Poor Stars in the Disk System of the Milky Way

classification astro-ph.GA astro-ph.SR
keywords populationmilkypopulationsstarscarbon-enhanceddiskgaiametal-poor
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a chemo-dynamical analysis of low-resolution ($R \sim 1300$) spectroscopy of stars from the AAOmega Evolution of Galactic Structure (AEGIS) survey, focusing on two key populations of carbon-enhanced metal-poor (CEMP) stars within the disk system of the Milky Way: a mildly prograde population ($L_z < 1000\,$kpc$\,$km$\,$s$^{-1}$) and a strongly prograde ($L_z > 1000\,$kpc$\,$km$\,$s$^{-1}$) population. Based on their chemical and kinematic characteristics, and on comparisons with similar populations found in the recent literature, we tentatively associate the former with an ex-situ inner-halo population originating from either the $Gaia$ Sausage or $Gaia$-Enceladus. The latter population is linked to the metal-weak thick-disk (MWTD). We discuss their implications in the context of the formation history of the Milky Way.

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