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The chemical composition of the low-mass Galactic globular cluster NGC 6362

Massari, D and Mucciarelli, A and Dalessandro, E and Bellazzini, M and Cassisi, S and Fiorentino, G and Ibata, RA and Lardo, C and Salaris, M (2017) The chemical composition of the low-mass Galactic globular cluster NGC 6362. Monthly Notices of the Royal Astronomical Society, 468 (1). pp. 1249-1258. ISSN 0035-8711

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Abstract

We present chemical abundances for 17 elements in a sample of 11 red giant branch stars in NGC 6362 from UVES spectra. NGC 6362 is one of the least massive globulars where multiple populations have been detected, yet its detailed chemical composition has not been investigated so far. NGC 6362 turns out to be a metal-intermediate ([Fe/H]=-1.07\pm0.01 dex) cluster, with its \alpha- and Fe-peak elements content compatible with that observed in clusters with similar metallicity. It also displays an enhancement in its s-process element abundances. Among the light elements involved in the multiple populations phenomenon, only [Na/Fe] shows star-to-star variations, while [Al/Fe] and [Mg/Fe] do not show any evidence for abundance spreads. A differential comparison with M4, a globular cluster with similar mass and metallicity, reveals that the two clusters share the same chemical composition. This finding suggests that NGC 6362 is indeed a regular cluster, formed from gas that has experienced the same chemical enrichment of other clusters with similar metallicity.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.SR; astro-ph.SR; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 03 Mar 2017 11:07
Last Modified: 09 Sep 2017 00:30
DOI or Identification number: 10.1093/mnras/stx549
URI: http://researchonline.ljmu.ac.uk/id/eprint/5746

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