Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid

Razera, R.; Barbuy, B.; Moura, T. C.; Ernandes, H.; Pérez-Villegas, A.; Souza, S. O.; Chiappini, C.; Queiroz, A. B. A.; Anders, F.; Fernández-Trincado, J. G.; Friaça, A. C. S.; Cunha, K.; Smith, V. V.; Santiago, B. X.; Schiavon, R. P.; Valentini, M.; Minniti, D.; Schultheis, M.; Geisler, D.; Sobeck, J.; Placco, V. M.; Zoccali, M.

doi:10.1093/mnras/stac2136

Title: Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid

Journal Article · 31 July 2022 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stac2136 · OSTI ID:1896839

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Univ. of Sao Paulo (Brazil)
Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico)
Univ. of Sao Paulo (Brazil); Leibniz Institute for Astrophysics Potsdam (AIP), Potsdam (Germany)
Leibniz Institute for Astrophysics Potsdam (AIP), Potsdam (Germany)
Leibniz Institute for Astrophysics Potsdam (AIP), Potsdam (Germany); Univ. of Potsdam (Germany)
Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona (Spain); Univ. of Barcelona (Italy)
Catholic University of the North (Chile)
Univ. of Arizona, Tucson, AZ (United States); National Observatory (Brazil)
National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)
Federal University of Rio Grande do Sul (Brazil)
Liverpool John Moores Univ. (United Kingdom)
Andrés Bello National University, Santiago (Chile); Vatican Observatory (Italy)
Universite Cote d'Azur, Nice (France)
University of Concepción (Chile); Univ. of La Serena (Chile)
Univ. of Washington, Seattle, WA (United States)
Pontifica Universidad Catolica de Chile, Santiago (Chile); Millennium Institute of Astrophysics (MAS) (Chile)

The central part of the Galaxy hosts a multitude of stellar populations, including the spheroidal bulge stars, stars moved to the bulge through secular evolution of the bar, inner halo, inner thick disc, inner thin disc, as well as debris from past accretion events. We identified a sample of 58 candidate stars belonging to the stellar population of the spheroidal bulge, and analyse their abundances. The present calculations of Mg, Ca, and Si lines are in agreement with the ASPCAP abundances, whereas abundances of C, N, O, and Ce are re-examined. We find normal α-element enhancements in oxygen, similar to magnesium, Si, and Ca abundances, which are typical of other bulge stars surveyed in the optical in Baade’s Window. The enhancement of [O/Fe] in these stars suggests that they do not belong to accreted debris. No spread in N abundances is found, and none of the sample stars is N-rich, indicating that these stars are not second generation stars originated in globular clusters. Ce instead is enhanced in the sample stars, which points to an s-process origin such as due to enrichment from early generations of massive fast rotating stars, the so-called spinstars.

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Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: Alfred P. Sloan Foundation; Center for Astrophysics and Associated Technologies; Chilean National Agency for Research and Development (ANID); German Research Foundation (DFG); Millennium Institute of Astrophysics (MAS); National Fund for Scientific and Technological Development (FONDECYT); National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)

OSTI ID:: 1896839

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 517; ISSN 0035-8711; ISSN 1365-2966

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United States

Language:: English

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CHEMICAL EVOLUTION OF THE INNER 2 DEGREES OF THE MILKY WAY BULGE: [ α /Fe] TRENDS AND METALLICITY GRADIENTS Ryde, N.; Schultheis, M.; Grieco, V. The Astronomical Journal, Vol. 151, Issue 1 https://doi.org/10.3847/0004-6256/151/1/1	journal	December 2015
Aspcap: the Apogee Stellar Parameter and Chemical Abundances Pipeline García Pérez, Ana E.; Prieto, Carlos Allende; Holtzman, Jon A. The Astronomical Journal, Vol. 151, Issue 6 https://doi.org/10.3847/0004-6256/151/6/144	journal	May 2016
Characterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane Minniti, Dante; Dékány, Istvan; Majaess, Daniel The Astronomical Journal, Vol. 153, Issue 4 https://doi.org/10.3847/1538-3881/aa5be4	journal	March 2017
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APOGEE Data Releases 13 and 14: Stellar Parameter and Abundance Comparisons with Independent Analyses Jönsson, Henrik; Prieto, Carlos Allende; Holtzman, Jon A. The Astronomical Journal, Vol. 156, Issue 3 https://doi.org/10.3847/1538-3881/aad4f5	journal	August 2018
The Bulge Radial Velocity Assay for RR Lyrae Stars (BRAVA-RR) DR2: A Bimodal Bulge? Kunder, Andrea; Pérez-Villegas, Angeles; Rich, R. Michael The Astronomical Journal, Vol. 159, Issue 6 https://doi.org/10.3847/1538-3881/ab8d35	journal	May 2020
The APOGEE Library of Infrared SSP Templates (A-LIST): High-resolution Simple Stellar Population Spectral Models in the H Band Ashok, Aishwarya; Zasowski, Gail; Seth, Anil The Astronomical Journal, Vol. 161, Issue 4 https://doi.org/10.3847/1538-3881/abd7f1	journal	March 2021
The APOGEE Data Release 16 Spectral Line List Smith, Verne V.; Bizyaev, Dmitry; Cunha, Katia The Astronomical Journal, Vol. 161, Issue 6 https://doi.org/10.3847/1538-3881/abefdc	journal	May 2021
Final Targeting Strategy for the Sloan Digital Sky Survey IV Apache Point Observatory Galactic Evolution Experiment 2 North Survey Beaton, Rachael L.; Oelkers, Ryan J.; Hayes, Christian R. The Astronomical Journal, Vol. 162, Issue 6 https://doi.org/10.3847/1538-3881/ac260c	journal	December 2021
Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey Santana, Felipe A.; Beaton, Rachael L.; Covey, Kevin R. The Astronomical Journal, Vol. 162, Issue 6 https://doi.org/10.3847/1538-3881/ac2cbc	journal	December 2021
IDENTIFICATION OF NEODYMIUM IN THE APOGEE H -BAND SPECTRA Hasselquist, Sten; Shetrone, Matthew; Cunha, Katia The Astrophysical Journal, Vol. 833, Issue 1 https://doi.org/10.3847/1538-4357/833/1/81	journal	December 2016
Bright Metal-Poor Stars from the Hamburg/Eso Survey. ii. a Chemodynamical Analysis Beers, Timothy C.; Placco, Vinicius M.; Carollo, Daniela The Astrophysical Journal, Vol. 835, Issue 1 https://doi.org/10.3847/1538-4357/835/1/81	journal	January 2017
Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window Cunha, Katia; Smith, Verne V.; Hasselquist, Sten The Astrophysical Journal, Vol. 844, Issue 2 https://doi.org/10.3847/1538-4357/aa7beb	journal	August 2017
APOGEE DR14/DR15 Abundances in the Inner Milky Way Zasowski, G.; Schultheis, M.; Hasselquist, S. The Astrophysical Journal, Vol. 870, Issue 2 https://doi.org/10.3847/1538-4357/aaeff4	journal	January 2019
The 16th Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra Ahumada, Romina; Prieto, Carlos Allende; Almeida, Andrés The Astrophysical Journal Supplement Series, Vol. 249, Issue 1 https://doi.org/10.3847/1538-4365/ab929e	journal	June 2020
The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar, and APOGEE-2 Data The Astrophysical Journal Supplement Series, Vol. 259, Issue 2, p. 35 https://doi.org/10.3847/1538-4365/ac4414	journal	March 2022
Discovery of a Large Population of Nitrogen-enhanced Stars in the Magellanic Clouds Fernández-Trincado, José G.; Beers, Timothy C.; Minniti, Dante The Astrophysical Journal Letters, Vol. 903, Issue 1 https://doi.org/10.3847/2041-8213/abc01d	journal	October 2020

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