Published July 2015
| Version v1
Journal article
The Gaia -ESO Survey: Detailed abundances in the metal-poor globular cluster NGC 4372
Creators
- San Roman, I.
- Muñoz, C.
- Geisler, D.
- Villanova, S.
- Kacharov, N.
- Koch, A.
- Carraro, G.
- Tautvaišiene, G.
- Vallenari, A.
- Alfaro, E.
- Bensby, T.
- Flaccomio, E.
- Francois, P.
- Korn, A.
- Pancino, E.
- Recio-Blanco, A.
- Smiljanic, R.
- Bergemann, M.
- Costado, M.
- Damiani, F.
- Heiter, U.
- Hourihane, A.
- Jofre, P.
- Lardo, C.
- de Laverny, P.
- Masseron, T.
- Morbidelli, L.
- Sbordone, L.
- Sousa, S.
- Worley, C.
- Zaggia, S.
Contributors
Others:
- Departamento de Fisica Teorica C-XI (FTUAM) ; Universidad Autónoma de Madrid (UAM)
- Laboratoire d'astrophysique de l'observatoire de Besançon (UMR 6091) (LAOB) ; Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) ; Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)
- INAF - Osservatorio Astronomico di Padova (OAPD) ; Istituto Nazionale di Astrofisica (INAF)
- Galaxies, Etoiles, Physique, Instrumentation (GEPI) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
- Department of Physics and Astronomy [Uppsala] ; Uppsala University
- INAF - Osservatorio Astronomico di Bologna (OABO) ; Istituto Nazionale di Astrofisica (INAF)
- Joseph Louis LAGRANGE (LAGRANGE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Università degli studi di Torino = University of Turin (UNITO)
- Uppsala University
- Ecole Polytechnique Fédérale de Lausanne (EPFL)
- Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Institute of Astronomy [Cambridge] ; University of Cambridge [UK] (CAM)
Description
We present the abundance analysis for a sample of 7 red giant branch stars in the metal-poor globular cluster NGC 4372 based on UVES spectra acquired as part of the Gaia-ESO Survey. This is the first extensive study of this cluster from high-resolution spectroscopy. We derive abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, Fe, Cr, Ni, Y, Ba, and La. We find a metallicity of [Fe/H] = -2.19 ± 0.03 and find no evidence of any metallicity spread. This metallicity makes NGC 4372 one of the most metal-poor Galactic globular clusters. We also find an α-enhancement typical of halo globular clusters at this metallicity. Significant spreads are observed in the abundances of light elements. In particular, we find a Na-O anticorrelation. Abundances of O are relatively high compared with other globular clusters. This could indicate that NGC 4372 was formed in an environment with high O for its metallicity. A Mg-Al spread is also present that spans a range of more than 0.5 dex in Al abundances. Na is correlated with Al and Mgabundances at a lower significance level. This pattern suggests that the Mg-Al burning cycle is active. This behavior can also be seen in giant stars of other massive, metal-poor clusters. A relation between light and heavy s-process elements has been identified.
Abstract
International audienceAdditional details
Identifiers
- URL
- https://hal.archives-ouvertes.fr/hal-02476457
- URN
- urn:oai:HAL:hal-02476457v1