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Kron 3: a fourth intermediate age cluster in the SMC with evidence of multiple populations

Hollyhead, K, Lardo, C, Kacharov, N, Bastian, N, Hilker, M, Rejkuba, M, Koch, A, Grebel, EK and Georgiev, I (2018) Kron 3: a fourth intermediate age cluster in the SMC with evidence of multiple populations. Monthly Notices of the Royal Astronomical Society. ISSN 1365-2966

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We present the results of a spectroscopic study of the intermediate age (approximately 6.5 Gyr) massive cluster Kron 3 in the Small Magellanic Cloud. We measure CN and CH band strengths (at 3839 and 4300 Angstroms respectively) using VLT FORS2 spectra of 16 cluster members and find a sub-population of 5 stars enriched in nitrogen. We conclude that this is evidence for multiple populations in Kron 3, the fourth intermediate age cluster, after Lindsay 1, NGC 416 and NGC 339 (ages 6-8 Gyr), to display this phenomenon originally thought to be a unique characteristic of old globular clusters. At 6.5 Gyr this is one of the youngest clusters with multiple populations, indicating that the mechanism responsible for their onset must operate until a redshift of at least 0.75, much later than the peak of globular cluster formation at redshift ~3.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018, [authors: K. Hollyhead, C. Lardo, N. Kacharov, N. Bastian, M. Hilker, M. Rejkuba, A. Koch, E. K. Grebel, I. Georgiev.] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 26 Feb 2018 16:18
Last Modified: 26 Feb 2018 16:18
DOI or Identification number: 10.1093/mnras/sty230
URI: http://researchonline.ljmu.ac.uk/id/eprint/8132

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