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.authorGuerco, 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.authorFernandez-Trincado, J. G.
dc.contributor.authorFrinchaboy, P. M.
dc.contributor.authorHoltzman, J. A.
dc.contributor.authorJohnson, J. A.
dc.contributor.authorJoensson, 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.accessioned2025-01-20T17:06:19Z
dc.date.available2025-01-20T17:06:19Z
dc.date.issued2024
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 similar to 2000 stars in the Galactic bulge bar spatially contained within divided by X-Gal divided by < 5 kpc, divided by Y-Gal divided by < 3.5 kpc, and divided by Z(Gal)divided by < 1 kpc, and spanning metallicities between -2.0 less than or similar to [Fe/H] less than or similar to +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.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/ad28c2
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad28c2
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90779
dc.identifier.wosidWOS:001201829100001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.titleA Perspective on the Milky Way Bulge Bar as Seen from the Neutron-capture Elements Cerium and Neodymium with APOGEE
dc.typeartículo
dc.volumen965
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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