A Perspective on the Milky Way Bulge Bar as Seen from the Neutron-capture Elements Cerium and Neodymium with APOGEE

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dc.contributor.authorSales-Silva J.V.
dc.contributor.authorCunha K.
dc.contributor.authorSmith V.V.
dc.contributor.authorDaflon S.
dc.contributor.authorSouto D.
dc.contributor.authorGuerço R.
dc.contributor.authorQueiroz A.
dc.contributor.authorChiappini C.
dc.contributor.authorHayes C.R.
dc.contributor.authorMasseron T.
dc.contributor.authorHasselquist, Sten
dc.contributor.authorHorta D.
dc.contributor.authorPrantzos N.
dc.contributor.authorZoccali M.
dc.contributor.authorAllende Prieto C.
dc.contributor.authorBarbuy B.
dc.contributor.authorBeaton R.
dc.contributor.authorBizyaev D.
dc.contributor.authorFernández-Trincado J.G.
dc.contributor.authorFrinchaboy P.M.
dc.contributor.authorHoltzman J.A.
dc.contributor.authorJohnson J.A.
dc.contributor.authorJönsson, Henrik
dc.contributor.authorMajewski S.R.
dc.contributor.authorMinniti D.
dc.contributor.authorNidever D.L.
dc.contributor.authorSchiavon R.P.
dc.contributor.authorSchultheis M.
dc.contributor.authorSobeck J.
dc.contributor.authorStringfellow G.S.
dc.contributor.authorZasowski G.
dc.date.accessioned2024-04-30T15:27:23Z
dc.date.available2024-04-30T15:27:23Z
dc.date.issued2024-04-01
dc.descriptionIndexación: Scopus.
dc.description.abstractThis study probes the chemical abundances of the neutron-capture elements cerium and neodymium in the inner Milky Way from an analysis of a sample of ∼2000 stars in the Galactic bulge bar spatially contained within ∣X Gal∣ < 5 kpc, ∣Y Gal∣ < 3.5 kpc, and ∣Z Gal∣ < 1 kpc, and spanning metallicities between −2.0 ≲ [Fe/H] ≲ +0.5. We classify the sample stars into low- or high-[Mg/Fe] populations and find that, in general, values of [Ce/Fe] and [Nd/Fe] increase as the metallicity decreases for the low- and high-[Mg/Fe] populations. Ce abundances show a more complex variation across the metallicity range of our bulge-bar sample when compared to Nd, with the r-process dominating the production of neutron-capture elements in the high-[Mg/Fe] population ([Ce/Nd] < 0.0). We find a spatial chemical dependence of Ce and Nd abundances for our sample of bulge-bar stars, with low- and high-[Mg/Fe] populations displaying a distinct abundance distribution. In the region close to the center of the MW, the low-[Mg/Fe] population is dominated by stars with low [Ce/Fe], [Ce/Mg], [Nd/Mg], [Nd/Fe], and [Ce/Nd] ratios. The low [Ce/Nd] ratio indicates a significant contribution in this central region from r-process yields for the low-[Mg/Fe] population. The chemical pattern of the most metal-poor stars in our sample suggests an early chemical enrichment of the bulge dominated by yields from core-collapse supernovae and r-process astrophysical sites, such as magnetorotational supernovae.
dc.description.urihttps://www-scopus-com.recursosbiblioteca.unab.cl/record/display.uri?eid=2-s2.0-85190583851&origin=resultslist&sort=plf-f&src=s&nlo=&nlr=&nls=&sid=1e87d1cc09949432c250911d413dd70c&sot=aff&sdt=cl&cluster=scofreetoread%2c%22all%22%2ct&sl=61&s=AF-ID%28%22Universidad+Andr%c3%a9s+Bello%22+60002636%29+AND+SUBJAREA%28PHYS%29&relpos=5&citeCnt=0&searchTerm=
dc.identifier.citationAstrophysical Journal Open Access Volume 965, Issue 21 April 2024 Article number 119
dc.identifier.doi10.3847/1538-4357/ad28c2
dc.identifier.issn0004637X
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/56486
dc.language.isoen
dc.publisherInstitute of Physics
dc.rights.licenseCC BY 4.0 DEED Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectGaia
dc.subjectBiomechanics
dc.subjectLAMOST
dc.titleA Perspective on the Milky Way Bulge Bar as Seen from the Neutron-capture Elements Cerium and Neodymium with APOGEE
dc.typeArtículo
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