Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE

Context . We have previously studied several elements in 58 selected bulge spheroid stars, based on spectral lines in the H band. We now derive the abundances of the less studied elements phosphorus (P; Z=15), sulphur (S; Z=16), and potassium (K; Z=19). Aims . The abundances of P, S, and K in 58 bulge spheroid stars are compared both with the results of a previous analysis of the data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE), and with a few available studies of these elements. Methods . We derived the individual abundances through spectral synthesis, using the stellar physical parameters available for our sample from the DR17 release of the APOGEE project. We provide recommendations for the best lines to be used for the studied elements among those in the H -band. We also compare the present results, together with literature data, with chemical-evolution models. Finally, the neutrino-process was taken into account for the suitable fit to the odd-Z elements P and K. Results . We confirm that the H -band has useful lines for the derivation of the elements P, S, and K in moderately metal-poor stars. The abundances, plotted together with literature results from high-resolution spectroscopy, indicate that moderately enhanced phosphorus stars are found, reminiscent of results obtained for thick disc and halo stars of metallicity [Fe/H]≈−1.0. Therefore, for the first time, we identify that this effect occurs in the old stars from the bulge spheroid. Sulphur is an α -element and behaves as such. Potassium and sulphur both exhibit some star-to-star scatter, but fit within the expectations of chemical evolution models.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-07-18
DOI
https://doi.org/10.1051/0004-6361/202555713
Citations
4
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
4.62

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article

Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE

T. Masseron, Verne V. Smith, D. A. García–Hernández, Ricardo P. Schiavon et al.
4 citations
Astronomy and Astrophysics
Stellar, planetary, and galactic studies
4.62
article

Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE

T. Masseron, Verne V. Smith, D. A. García–Hernández, Ricardo P. Schiavon, M. Valentini, D. Geisler, A. Pérez-Villegas, José G. Fernández-Trincado, Patricia Siqueira Silva, Maren Brauner, F. Anders, A. B. A. Queiroz, C. Nitschelm, S. Feltzing, H. Ernandes, Mônica Sartori de Camargo, S. O. Souza, M. Schultheis, Kátia Cunha, T.C. Beers, V. M. Placco, C. Chiappini, Diogo Souto, D. Minniti, B. X. Santiago, M. Zoccali, B. Barbuy, A.C.S. Fria̧ ca
article en
4 citations

Abstract

Context . We have previously studied several elements in 58 selected bulge spheroid stars, based on spectral lines in the H band. We now derive the abundances of the less studied elements phosphorus (P; Z=15), sulphur (S; Z=16), and potassium (K; Z=19). Aims . The abundances of P, S, and K in 58 bulge spheroid stars are compared both with the results of a previous analysis of the data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE), and with a few available studies of these elements. Methods . We derived the individual abundances through spectral synthesis, using the stellar physical parameters available for our sample from the DR17 release of the APOGEE project. We provide recommendations for the best lines to be used for the studied elements among those in the H -band. We also compare the present results, together with literature data, with chemical-evolution models. Finally, the neutrino-process was taken into account for the suitable fit to the odd-Z elements P and K. Results . We confirm that the H -band has useful lines for the derivation of the elements P, S, and K in moderately metal-poor stars. The abundances, plotted together with literature results from high-resolution spectroscopy, indicate that moderately enhanced phosphorus stars are found, reminiscent of results obtained for thick disc and halo stars of metallicity [Fe/H]≈−1.0. Therefore, for the first time, we identify that this effect occurs in the old stars from the bulge spheroid. Sulphur is an α -element and behaves as such. Potassium and sulphur both exhibit some star-to-star scatter, but fit within the expectations of chemical evolution models.

Astronomy and AstrophysicsVol. 700
University of Notre Dame (US), Centre National de la Recherche Scientifique (FR), Universidad de Antofagasta (CL), Universidade Federal do Rio Grande do Sul (BR), University of Arizona (US), Universidade de Brasília (BR), Universidad de La Laguna (ES), Pontificia Universidad Católica de Chile (CL), University of Concepción (CL), Lund University (SE), Universidade Federal de Sergipe (BR), Joint Institute for Nuclear Astrophysics (US), Université Côte d'Azur (FR), Leibniz Institute for Astrophysics Potsdam (DE), Universidad Católica del Norte (CL), Clínica Las Condes (CL), Valongo Observatory (BR), Institut d'Estudis Espacials de Catalunya (ES), Max Planck Institute for Astronomy (DE), Observatoire de la Côte d’Azur (FR), Instituto de Astrofísica de Canarias (ES), Community Science and Data Center (US), NSF NOIRLab (US), Vatican Observatory (IT), Liverpool John Moores University (GB), Universitat de Barcelona (ES), University of La Serena (CL), Universidad Nacional Autónoma de México (MX), Universitat Politècnica de Catalunya (ES)
National Science Foundation, Smithsonian Institution, U.S. Department of Energy, Alfred P. Sloan Foundation, Yale University, Carnegie Institution of Washington, Vanderbilt University, Ohio State University, University of Utah, University of Washington, Johns Hopkins University, Carnegie Mellon University, University of Notre Dame, University of Portsmouth, New Mexico State University, Joint Institute for Nuclear Astrophysics - Center for the Evolution of the Elements, York University, University of Oxford, European Commission, Fundação de Amparo à Pesquisa do Estado de São Paulo, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Ministério da Ciência, Tecnologia e Inovação, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Max-Planck-Gesellschaft, Ministerio de Ciencia e Innovación, Centro de Astrofísica y Tecnologías Afines, Universidad Nacional Autónoma de México, Universitat de Barcelona, Agencia Nacional de Investigación y Desarrollo, Max-Planck-Institut für Astrophysik, Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Canarias, Office of Science, University of Colorado Boulder, Leibniz-Gemeinschaft, Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México, European Regional Development Fund, Agencia Estatal de Investigación, Institut de Ciències del Cosmos, Office of International Science and Engineering, Lawrence Berkeley National Laboratory
Openalex Percentile: Top 5%
Stellar, planetary, and galactic studies
4.62
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