Chemical characterisation of the globular cluster NGC 5634 associated to the Sagittarius dwarf spheroidal galaxy

E. Carretta, A. Bragaglia, S. Lucatello, V. D'Orazi, R. G. Gratton, P. Donati, A. Sollima, C. Sneden

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    Abstract

    As part of our on-going project on the homogeneous chemical characterisation of multiple stellar populations in globular clusters (GCs), we studied NGC 5634, associated to the Sagittarius dwarf spheroidal galaxy, using high-resolution spectroscopy of red giant stars collected with VLT/FLAMES. We present here the radial velocity distribution of the 45 observed stars, 43 of which are cluster members, the detailed chemical abundance of 22 species for the seven stars observed with UVES-FLAMES, and the abundance of six elements for stars observed with GIRAFFE. On our homogeneous UVES metallicity scale, we derived a low-metallicity [Fe/H] =-1.867 ± 0.019 ± 0.065 dex (±statistical ±systematic error) with σ = 0.050 dex (7 stars). We found the normal anticorrelations between light elements (Na and O, Mg and Al), a signature of multiple populations typical of massive and old GCs. We confirm the associations of NGC 5634 to the Sgr dSph, from which the cluster was lost a few Gyr ago, on the basis of its velocity and position, and the abundance ratios of α and neutron capture elements.

    Original languageEnglish
    Article numberA118
    Pages (from-to)1-13
    Number of pages13
    JournalAstronomy and Astrophysics
    Volume600
    DOIs
    Publication statusPublished - 1 Apr 2017

    Bibliographical note

    Copyright 2017 ESO. First published in Astronomy and Astrophysics, 600, A118, 2017, published by EDP Sciences. The original publication is available at https://doi.org/10.1051/0004-6361/201630004. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • Globular clusters: general
    • Globular clusters: individual: NGC 5634
    • Stars: abundances
    • Stars: atmospheres
    • Stars: Population II

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