NGC 6139

a normal massive globular cluster, or a first-generation dominated cluster? Clues from the light elements

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

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Abstract

Information on globular clusters (GC) formation mechanisms can be gathered by studying the chemical signature of the multiple populations that compose these stellar systems. In particular, we investigate the anti-correlations among O, Na, Al, and Mg to explore the influence of cluster mass and environment on GCs in the Milky Way and in extragalactic systems. We present here the results obtained on NGC 6139, which, on the basis of its horizontal branch morphology, has been proposed to be dominated by first-generation stars. In our extensive study based on high-resolution spectroscopy, the first for this cluster, we found a metallicity of [Fe/H] = -1.579 ± 0.015 ± 0.058 (rms = 0.040 dex, 45 bona fide member stars) on the UVES scale defined by our group. The stars in NGC 6139 show a chemical pattern normal for GCs, with a rather extended Na-O (and Mg-Al) anti correlation. NGC 6139 behaves as expected from its mass and contains a large portion (about two thirds) of second-generation stars.

Original languageEnglish
Article numberA69
Pages (from-to)1-9
Number of pages9
JournalAstronomy and Astrophysics
Volume583
DOIs
Publication statusPublished - 1 Nov 2015

Bibliographical note

Copyright 2015 ESO. First published in Astronomy and astrophysics 583, A69, 2015, published by EDP Sciences. The original publication is available at http://dx.doi.org/10.1051/0004-6361/201526592. Reproduced with permission from Astronomy & Astrophysics, © ESO.

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    Bragaglia, A., Carretta, E., Sollima, A., Donati, P., D'Orazi, V., Gratton, R. G., ... Sneden, C. (2015). NGC 6139: a normal massive globular cluster, or a first-generation dominated cluster? Clues from the light elements. Astronomy and Astrophysics, 583, 1-9. [A69]. https://doi.org/10.1051/0004-6361/201526592