APOGEE-2 Discovery of a Large Population of Relatively High-metallicity Globular Cluster Debris
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Fecha
2021-09-10
Profesor/a Guía
Facultad/escuela
Idioma
en
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American Astronomical Society
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Licencia CC
Atribución/Reconocimiento 4.0 Internacional
CC BY 4.0
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Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
We report the discovery of a new, chemically distinct population of relatively high-metallicity ([Fe/H] > -0.7) red giant stars with super-solar [N/Fe] (⪆+0.75) identified within the bulge, disk, and halo of the Milky Way. This sample of stars was observed during the second phase of the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2); the spectra of these stars are part of the seventeenth Data Release (DR 17) of the Sloan Digital Sky Survey. We hypothesize that this newly identified population was formed in a variety of progenitors, and is likely made up of either fully or partially destroyed metal-rich globular clusters, which we refer to as globular cluster debris (GCD), identified by their unusual photospheric nitrogen abundances. It is likely that some of the GCD stars were probable members of the Gaia-Enceladus-Sausage accretion event, along with clusters formed in situ. © 2021. The American Astronomical Society. All rights reserved.
Notas
Indexación: Scopus.
Palabras clave
Globular Cluster, Stars: Abundances, Photometry
Citación
Astrophysical Journal Letters, Volume 918, Issue 2, 10 September 2021, Article number L37
DOI
10.3847/2041-8213/ac225b