Homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code

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Homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code

Masseron, T. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.,Instituto de Astrofísica de Canarias,University of La Laguna (ULL)

Garcia-Hernandez, D. A. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.,Instituto de Astrofísica de Canarias,University of La Laguna (ULL)

Meszaros, Sz. (författare): Eotvos Lorand Univ, Gothard Astrophys Observ, Szombathely, Hungary.;Hungarian Acad Sci, Budapest, Hungary.,Eötvös Loránd University

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Zamora, O. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.,University of La Laguna (ULL),Instituto de Astrofísica de Canarias

Dell'Agli, F. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.,Instituto de Astrofísica de Canarias,University of La Laguna (ULL)

Allende Prieto, C. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.,University of La Laguna (ULL),Instituto de Astrofísica de Canarias

Edvardsson, Bengt, Associate Professor, 1956- (författare): Uppsala University,Uppsala universitet,Teoretisk astrofysik,Uppsala Univ, Theoret Astrophys, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden.

Shetrone, M. (författare): Univ Texas Austin, McDonald Observ, Ft Davis, TX 79734 USA.,University of Texas at Austin

Plez, B. (författare): Univ Montpellier, CNRS, Lab Univers & Particules Montpellier, F-34095 Montpellier 05, France.,Laboratoire Univers et Particules de Montpellier

Fernandez-Trincado, J. G. (författare): Univ Atacama, Inst Astron & Ciencias Planetarias, Copayapu 485, Copiapo, Chile.;Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile.;Univ Bourgogne Franche Comte, Inst Utinam, CNRS, UMR 6213,THETA Franche Comte,Observ Besancon, BP 1615, F-25010 Besancon, France.,University of Atacama,University of Burgundy - Franche-Comté,University of Concepción

Cunha, K. (författare): Observ Nacl MCTI, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, Brazil.;Univ Arizona, Steward Observ, Tucson, AZ 85719 USA.,University of Arizona,National Observatory Brazil

Jönsson, H. (författare): Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science

Geisler, D. (författare): Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile.;Univ La Serena, Inst Invest Multidisciplinario Ciencia & Tecnol, Ave Raul Bitran S-N, La Serena, Chile.;Univ La Serena, Dept Fis & Astron, Fac Ciencias, Ave Juan Cisternas, La Serena 1200, Chile.,Universidad de La Serena,University of Concepción

Beers, T. C. (författare): Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA.;Univ Notre Dame, JINA Ctr Evolut Elements, Notre Dame, IN 46556 USA.,University of Notre Dame

Cohen, R. E. (författare): Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21210 USA.,Space Telescope Science Institute

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Inst Astrofis Canarias, Tenerife 38205, Spain;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain. Instituto de Astrofísica de Canarias (creator_code:org_t)

2019-02-18
2019
Engelska.
Ingår i: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 622

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Tidskriftsartikel (refereegranskat)

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Aims: We seek to provide abundances of a large set of light and neutron-capture elements homogeneously analyzed that cover a wide range of metallicity to constrain globular cluster (GC) formation and evolution models.Methods: We analyzed a large sample of 885 GCs giants from the SDSS IV-Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. We used the Cannon results to separate the red giant branch and asymptotic giant branch stars, not only allowing for a refinement of surface gravity from isochrones, but also providing an independent H-band spectroscopic method to distinguish stellar evolutionary status in clusters. We then used the Brussels Automatic Code for Characterizing High accUracy Spectra (BACCHUS) to derive metallicity, microturbulence, macroturbulence, many light-element abundances, and the neutron-capture elements Nd and Ce for the first time from the APOGEE GCs data.Results: Our independent analysis helped us to diagnose issues regarding the standard analysis of the APOGEE DR14 for low-metallicity GC stars. Furthermore, while we confirm most of the known correlations and anticorrelation trends (Na-O, Mg-Al, C-N), we discover that some stars within our most metal-poor clusters show an extreme Mg depletion and some Si enhancement. At the same time, these stars show some relative Al depletion, displaying a turnover in the Mg-Al diagram. These stars suggest that Al has been partially depleted in their progenitors by very hot proton-capture nucleosynthetic processes. Furthermore, we attempted to quantitatively correlate the spread of Al abundances with the global properties of GCs. We find an anticorrelation of the Al spread against clusters metallicity and luminosity, but the data do not allow us to find clear evidence of a dependence of N against metallicity in the more metal-poor clusters.Conclusions: Large and homogeneously analyzed samples from ongoing spectroscopic surveys unveil unseen chemical details for many clusters, including a turnover in the Mg-Al anticorrelation, thus yielding new constrains for GCs formation/evolution models.

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Av författaren/redakt...: Masseron, T.; Garcia-Hernandez ...; Meszaros, Sz.; Zamora, O.; Dell'Agli, F.; Allende Prieto, ...; visa fler...; Edvardsson, Beng ...; Shetrone, M.; Plez, B.; Fernandez-Trinca ...; Cunha, K.; Jönsson, H.; Geisler, D.; Beers, T. C.; Cohen, R. E.; visa färre...

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Av lärosätet: Uppsala universitet; Malmö universitet; Lunds universitet

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Homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code

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