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Searching for GC-like abundance patterns in young massive clusters

Cabrera-Ziri, I and Lardo, C and Davies, B and Bastian, N and Beccari, G and Larsen, SS and Hernandez, S (2016) Searching for GC-like abundance patterns in young massive clusters. Monthly Notices of the Royal Astronomical Society, 460 (2). pp. 1869-1875. ISSN 0035-8711

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Abstract

Studies during the last decade have revealed that nearly all Globular Clusters (GCs) host multiple populations (MPs) of stars with a distinctive chemical patterns in light elements. No evidence of such MPs has been found so far in lower-mass ($< \sim 10^4$ M$_{\odot}$) open clusters nor in intermediate age (1-2 Gyr) massive ($> 10^5$ M$_{\odot}$) clusters in the Local Group. Young massive clusters (YMCs) have masses and densities similar to those expected of young GCs in the early universe, and their near-infrared (NIR) spectra are dominated by the light of red super giants (RSGs). The spectra of these stars may be used to determine the cluster's abundances, even though the individual stars cannot be spatially resolved from one another. We carry out a differential analysis between the Al lines of YMC NGC 1705: 1 and field Small Magellanic Cloud RSGs with similar metallicities. We exclude at high confidence extreme [Al/Fe] enhancements similar to those observed in GCs like NGC 2808 or NGC 6752. However, smaller variations cannot be excluded.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record I. Cabrera-Ziri, C. Lardo, B. Davies, N. Bastian, G. Beccari, S. S. Larsen, and S. Hernandez; Searching for GC-like abundance patterns in young massive clusters. MNRAS (August 01, 2016) Vol. 460 1869-1875 doi:10.1093/mnras/stw1090 first published online May 9, 2016 is available online at: http://dx.doi.org/10.1093/mnras/stw1090.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 01 Sep 2016 11:06
Last Modified: 01 Sep 2016 11:06
DOI or Identification number: 10.1093/mnras/stw1090
URI: http://researchonline.ljmu.ac.uk/id/eprint/4082

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