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A Perspective on the Milky Way Bulge Bar as Seen from the Neutron-capture Elements Cerium and Neodymium with APOGEEShow simple item record

dc.creatorSales-Silva, J. V.
dc.creatorCunha, K.
dc.creatorSmith, V. V.
dc.creatorDaflon, S.
dc.creatorSouto, D.
dc.creatorGuerco, R.
dc.creatorQueiroz, A.
dc.creatorChiappini, C.
dc.creatorHayes, C. R.
dc.creatorMasseron, T.
dc.creatorHasselquist, Sten
dc.creatorHorta, D.
dc.creatorPrantzos, N.
dc.creatorZoccali, M.
dc.creatorAllende Prieto, C.
dc.creatorBarbuy, B.
dc.creatorBeaton, R.
dc.creatorBizyaev, D.
dc.creatorFernandez-Trincado, J. G.
dc.creatorFrinchaboy, P. M.
dc.creatorHoltzman, J. A.
dc.creatorJohnson, J. A.
dc.creatorJoensson, Henrik
dc.creatorMajewski, S. R.
dc.creatorMinniti, D.
dc.creatorNidever, D. L.
dc.creatorSchiavon, R. P.
dc.creatorSchultheis, M.
dc.creatorSobeck, J.
dc.creatorStringfellow, G. S.
dc.creatorZasowski, G.
dc.date.accessioned2024-09-25T21:35:59Z
dc.date.available2024-09-25T21:35:59Z
dc.date.issued4/1/2024
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad28c2
dc.identifier.urihttps://repository.tcu.edu/handle/116099117/65997
dc.descriptionThis 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.languageen
dc.publisherAmerican Astronomical Society
dc.sourceASTROPHYSICAL JOURNAL
dc.titleA Perspective on the Milky Way Bulge Bar as Seen from the Neutron-capture Elements Cerium and Neodymium with APOGEE
dc.typeArticle
dc.rights.licenseCC BY 4.0
local.collegeCollege of Science and Engineering
local.departmentPhysics and Astronomy
local.personsFrinchaboy (PHYS)


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