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A Perspective on th...
A Perspective on the Milky Way Bulge Bar as Seen from the Neutron-capture Elements Cerium and Neodymium with APOGEE
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- Sales-Silva, J. V. (author)
- Observ Nacl MCTI, MCTI, R Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, Brazil
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- Cunha, K. (author)
- Observ Nacl MCTI, MCTI, R Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, Brazil; Univ Arizona, Steward Observ, Tucson, AZ 85719 USA
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- Smith, V. V. (author)
- NOIRLab, Tucson, AZ 85719 USA
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- Daflon, S. (author)
- Observ Nacl MCTI, MCTI, R Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, Brazil
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- Souto, D. (author)
- Univ Fed Sergipe, Dept Fis, Ave Marechal Rondon S-N, BR-49000000 Sao Cristovao, SE, Brazil
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- Guerco, R. (author)
- Observ Nacl MCTI, MCTI, R Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, Brazil
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- Queiroz, A. (author)
- Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Tenerife, Spain
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- Chiappini, C. (author)
- Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
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- Hayes, C. R. (author)
- NRC Herzberg Astron & Astrophys Res Ctr, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada
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- Masseron, T. (author)
- Inst Astrofis Canarias IAC, E-38205 San Cristobal la Laguna, Tenerife, Spain; Univ La Laguna ULL, Dept Astrofis, San Cristobal la Laguna 38206, Tenerife, Spain
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- Hasselquist, Sten (author)
- Space Telescope Sci Inst, Baltimore, MD USA
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- Horta, D. (author)
- Flatiron Inst, New York, NY 10010 USA
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- Prantzos, N. (author)
- Inst Astrophys Paris, UMR 7095, CNRS, 98 Bis Blvd Arago, F-75014 Paris, France; Sorbonne Univ, 98 Bis Blvd Arago, F-75014 Paris, France
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- Zoccali, M. (author)
- Pontificia Univ Catolica Chile, Inst Astrofis, Vicuna Mackenna 4860, Macul, Casilla 306, Santiago 22, Chile; Millenium Inst Astrophys MAS, Nuncio Monsenor Sotero Sanz 100, Santiago, Chile
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- Allende Prieto, C. (author)
- Inst Astrofis Canarias IAC, E-38205 San Cristobal la Laguna, Tenerife, Spain; Univ La Laguna ULL, Dept Astrofis, San Cristobal la Laguna 38206, Tenerife, Spain
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- Barbuy, B. (author)
- Univ Sao Paulo, IAG, Rua Matao 1226, Cidade Universitaria, BR-05508090 Sao Paulo, Brazil
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- Beaton, R. (author)
- Space Telescope Sci Inst, Baltimore, MD USA
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- Bizyaev, D. (author)
- New Mex State Univ, Apache Point Observ, POB 59, Sunspot, NM 88349 USA; Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow, Russia
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- Fernandez-Trincado, J. G. (author)
- Univ Catolica Norte, Inst Astron, Ave Angamos 0610, Antofagasta, Chile
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- Frinchaboy, P. M. (author)
- Texas Christian Univ, Dept Phys & Astron, TCU Box 298840, Ft Worth, TX 76129 USA
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- Holtzman, J. A. (author)
- New Mexico State Univ, Las Cruces, NM 88003 USA
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- Johnson, J. A. (author)
- Ohio State Univ, Ctr Cosmol & Astro Particle Phys, Dept Astron, Columbus, OH 43210 USA
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- Jönsson, Henrik (author)
- Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM)
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- Majewski, S. R. (author)
- Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA
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- Minniti, D. (author)
- Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, Brazil; Univ Andres Bello, Fac Ciencias Exactas, Inst Astrofis, Ave Fernandez Concha 700, Santiago, Chile; Vatican Observ, Vatican City I-V00120, Vatican
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- Nidever, D. L. (author)
- Montana State Univ, Dept Phys, POB 173840, Bozeman, MT 59717 USA
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- Schiavon, R. P. (author)
- Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3, England
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- Schultheis, M. (author)
- Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ, CS 34229, F-06304 Nice 4, France
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- Sobeck, J. (author)
- Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA
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- Stringfellow, G. S. (author)
- Univ Colorado, Ctr Astrophys & Space Astron, 389 UCB, Boulder, CO 80309 USA
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- Zasowski, G. (author)
- Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84105 USA
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(creator_code:org_t)
- Institute of Physics Publishing (IOPP), 2024
- 2024
- English.
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In: Astrophysical Journal. - : Institute of Physics Publishing (IOPP). - 0004-637X .- 1538-4357. ; 965:2
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Abstract
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- 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 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (subject category)
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Sales-Silva, J. ...
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Cunha, K.
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Smith, V. V.
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Daflon, S.
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Souto, D.
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Guerco, R.
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Queiroz, A.
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Chiappini, C.
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Hayes, C. R.
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Masseron, T.
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Hasselquist, Ste ...
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Horta, D.
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Prantzos, N.
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Zoccali, M.
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Allende Prieto, ...
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Barbuy, B.
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Beaton, R.
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Bizyaev, D.
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Fernandez-Trinca ...
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Frinchaboy, P. M ...
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Holtzman, J. A.
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Johnson, J. A.
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Jönsson, Henrik
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Majewski, S. R.
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Minniti, D.
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Nidever, D. L.
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Schiavon, R. P.
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Schultheis, M.
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Sobeck, J.
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Stringfellow, G. ...
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Zasowski, G.
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Malmö University