The Gaia-ESO Survey: Low-α element stars in the Galactic bulge

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dc.contributor.authorRecio-Blanco A.
dc.contributor.authorRojas-Arriagada A.
dc.contributor.authorDe Laverny P.
dc.contributor.authorMikolaitis S.
dc.contributor.authorHill V.
dc.contributor.authorZoccali M.
dc.contributor.authorFernández-Trincado J.G.
dc.contributor.authorRobin A.C.
dc.contributor.authorBabusiaux C.
dc.contributor.authorGilmore G.
dc.contributor.authorRandich S.
dc.contributor.authorAlfaro E.
dc.contributor.authorAllende Prieto C.
dc.contributor.authorBragaglia A.
dc.contributor.authorCarraro G.
dc.contributor.authorJofré P.
dc.contributor.authorLardo C.
dc.contributor.authorMonaco L.
dc.contributor.authorMorbidelli L.
dc.contributor.authorZaggia S.
dc.date.accessioned2024-05-24T15:51:50Z
dc.date.available2024-05-24T15:51:50Z
dc.date.issued2017-07
dc.descriptionIndexación: Scopus
dc.description.abstractWe take advantage of the Gaia-ESO Survey iDR4 bulge data to search for abundance anomalies that could shed light on the composite nature of the Milky Way bulge. The α-element (Mg, Si, and whenever available, Ca) abundances, and their trends with Fe abundances have been analysed for a total of 776 bulge stars. In addition, the aluminum abundances and their ratio to Fe and Mg have also been examined. Our analysis reveals the existence of low-α element abundance stars with respect to the standard bulge sequence in the [α/ Fe] versus [Fe/H] plane. Eighteen objects present deviations in [α/ Fe] ranging from 2.1 to 5.3σ with respect to the median standard value. Those stars do not show Mg-Al anti-correlation patterns. Incidentally, this sign of the existence of multiple stellar populations is reported firmly for the first time for the bulge globular cluster NGC 6522. The identified low-α abundance stars have chemical patterns that are compatible with those of the thin disc. Their link with massive dwarf galaxies accretion seems unlikely, as larger deviations in α abundance and Al would be expected. The vision of a bulge composite nature and a complex formation process is reinforced by our results. The approach used, which is a multi-method and model-driven analysis of high resolution data, seems crucial to reveal this complexity. © ESO, 2017.
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2017/06/aa30220-16/aa30220-16.html
dc.identifier.citationAstronomy and Astrophysics Volume 6021 June 2017 Article number L14
dc.identifier.doi10.1051/0004-6361/201630220
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/57035
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.licenseCC BY 4.0 DEED Atribución 4.0 Internacional
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectGalaxy: abundances
dc.subjectGalaxy: bulge
dc.subjectGalaxy: stellar content
dc.titleThe Gaia-ESO Survey: Low-α element stars in the Galactic bulge
dc.typeArtículo
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