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The Search for Multiple Populations in Magellanic Cloud Clusters II: The Detection of Multiple Populations in Three Intermediate-Age SMC Clusters

Niederhofer, F and Bastian, N and Kozhurina-Platais, V and Larsen, S and Hollyhead, K and Lardo, C and Cabrera-Ziri, I and Kacharov, N and Platais, I and Salaris, M and Cordero, M and Dalessandro, E and Geisler, D and Hilker, M and Li, C and Mackey, D and Mucciarelli, A (2017) The Search for Multiple Populations in Magellanic Cloud Clusters II: The Detection of Multiple Populations in Three Intermediate-Age SMC Clusters. Monthly Notices of the Royal Astronomical Society, 465 (4). pp. 4159-4165. ISSN 0035-8711

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Abstract

This is the second paper in our series about the search for multiple populations in Magellanic Cloud star clusters using the Hubble Space Telescope. Here we report the detection of multiple stellar populations in the colour-magnitude diagrams of the intermediate-age clusters Lindsay 1, NGC 416 and NGC 339. With ages between 6.0 and 7.5 Gyr, these clusters are the youngest ones in which chemical abundance spreads have been detected so far. This confirms that the appearance of multiple populations is not restricted to only ancient globular clusters, but may also be a common feature in clusters as young as 6 Gyr. Our results are in agreement with a recent spectroscopic study of Lindsay 1. We found that the fraction of enriched stars in NGC 416 is ~45% whereas it is ~25% in NGC 339 and ~36% in Lindsay 1. Similar to NGC 121, these fractions are lower than the average value for globular clusters in the Milky Way.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 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: 08 Dec 2016 11:54
Last Modified: 09 Sep 2017 16:32
DOI or Identification number: 10.1093/mnras/stw3084
URI: http://researchonline.ljmu.ac.uk/id/eprint/5046

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