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Kron 3: a fourth intermediate age cluster in the SMC with evidence of multiple populations
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 92018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 476, no 1, p. 114-121Article in journal (Refereed) Published
Abstract [en]

We present the results of a spectroscopic study of the intermediate age (approximate to 6.5 Gyr) massive cluster Kron 3 in the Small Magellanic Cloud. We measure CN and CH band strengths (at similar or equal to 3839 and 4300 angstrom, respectively) using VLT FORS2 spectra of 16 cluster members and find a sub-population of five 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 approximate to 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 similar to 3.

Place, publisher, year, edition, pages
2018. Vol. 476, no 1, p. 114-121
Keywords [en]
Magellanic Clouds, galaxies: star clusters: individual: Kron 3
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-155889DOI: 10.1093/mnras/sty230ISI: 000429276700010OAI: oai:DiVA.org:su-155889DiVA, id: diva2:1202948
Available from: 2018-05-02 Created: 2018-05-02 Last updated: 2018-05-02Bibliographically approved

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Hollyhead, Katherine
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Astronomy, Astrophysics and Cosmology

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