Aluminium-enriched metal-poor stars buried in the inner Galaxy

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dc.contributor.authorFernández-Trincado J.G.
dc.contributor.authorBeers T.C.
dc.contributor.authorMinniti D.
dc.contributor.authorTang B.
dc.contributor.authorVillanova S.
dc.contributor.authorGeisler D.
dc.contributor.authorPérez-Villegas A.
dc.contributor.authorVieira K.
dc.date.accessioned2021-11-09T18:36:22Z
dc.date.available2021-11-09T18:36:22Z
dc.date.issued2020-11
dc.descriptionIndexación Scopuses
dc.description.abstractStars with higher levels of aluminium and nitrogen enrichment are often key pieces in the chemical makeup of multiple populations in almost all globular clusters (GCs). There is also compelling observational evidence that some Galactic components could be partially built from dissipated GCs. The identification of such stars among metal-poor field stars may therefore provide insight into the composite nature of the Milky Way (MW) bulge and inner stellar halo, and could also reveal other chemical peculiarities. Here, based on APOGEE spectra, we report the discovery of 29 mildly metal-poor ([Fe/H] -0.7) stars with stellar atmospheres strongly enriched in aluminium (Al-rich stars: [Al/Fe] +0.5), well above the typical Galactic levels, located within the solar radius toward the bulge region, which lies in highly eccentric orbits (e 0.6). We find many similarities for almost all of the chemical species measured in this work with the chemical patterns of GCs, and therefore we propose that they have likely been dynamically ejected into the bulge and inner halo from GCs formed in situ and/or GCs formed in different progenitors of known merger events experienced by the MW, such as the Gaia-Sausage-Enceladus and/or Sequoia. © 2020 ESO.es
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2020/11/aa39207-20/aa39207-20.html
dc.identifier.citationAstronomy and Astrophysics, Volume 6431 November 2020 Article number L4es
dc.identifier.doi10.1051/0004-6361/202039207
dc.identifier.issn00046361
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/20817
dc.language.isoenes
dc.publisherEDP Scienceses
dc.subjectGaiaes
dc.subjectSolar Neighborhoodes
dc.subjectLAMOSTes
dc.titleAluminium-enriched metal-poor stars buried in the inner Galaxyes
dc.typeArtículoes
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