Sales-Silva J.V.Cunha K.Smith V.V.Daflon S.Souto D.Guerço R.Queiroz A.Chiappini C.Hayes C.R.Masseron T.Hasselquist, StenHorta D.Prantzos N.Zoccali M.Allende Prieto C.Barbuy B.Beaton R.Bizyaev D.Fernández-Trincado J.G.Frinchaboy P.M.Holtzman J.A.Johnson J.A.Jönsson, HenrikMajewski S.R.Minniti D.Nidever D.L.Schiavon R.P.Schultheis M.Sobeck J.Stringfellow G.S.Zasowski G.2024-04-302024-04-302024-04-01Astrophysical Journal Open Access Volume 965, Issue 21 April 2024 Article number 1190004637Xhttps://repositorio.unab.cl/handle/ria/56486Indexación: Scopus.This 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.enGaiaBiomechanicsLAMOSTArtículoCC BY 4.0 DEED Attribution 4.0 International10.3847/1538-4357/ad28c2