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• W4304789265 endingPage "187" @default.
• W4304789265 startingPage "187" @default.
• W4304789265 abstract "Abstract We report 23 stars having Galactocentric velocities larger than 450 km s −1 in the final data release of the APOGEE survey. This sample was generated using space velocities derived by complementing the high-quality radial velocities from the APOGEE project in Sloan Digital Sky Survey’s Data Release 17 (DR17) with distances and proper motions from Gaia early Data Release 3 (eDR3). We analyze the observed kinematics and derived dynamics of these stars, considering different potential models for the Galaxy. We find that three stars could be unbound depending on the adopted potential, but in general all of the stars show typical kinematics of halo stars. The APOGEE DR17 spectroscopic results and Gaia eDR3 photometry are used to assess the stellar parameters and chemical properties of the stars. All of the stars belong to the red giant branch, and, in general, they follow the abundance pattern of typical halo stars. There are a few exceptions that would deserve further analysis through high-resolution spectroscopy. In particular, we identify a high-velocity Carbon-Enhanced Metal-Poor star, with a Galactocentric velocity of 482 km s −1 . We do not confirm any hypervelocity star in the sample, but this result is very sensitive to the adopted distances and less sensitive to the Galactic potential." @default.
• W4304789265 created "2022-10-13" @default.
• W4304789265 creator A5003796579 @default.
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• W4304789265 date "2022-10-12" @default.
• W4304789265 modified "2023-10-14" @default.
• W4304789265 title "High-velocity Stars in SDSS/APOGEE DR17" @default.
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