Kron 3: a fourth intermediate age cluster in the SMC with evidence of multiple populations
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...
Guardado en:
| Autores principales: | , , , , , , , , |
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| Formato: | Article (Journal) Chapter/Article |
| Lenguaje: | inglés |
| Publicado: |
29 Jan 2018
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| In: |
Arxiv
Year: 2018, Pages: 1-9 |
| DOI: | 10.48550/arXiv.1801.09670 |
| Acceso en línea: | Resolving-System, kostenfrei, Volltext: https://doi.org/10.48550/arXiv.1801.09670 Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1801.09670 
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| Notas de Autor: | K. Hollyhead, C. Lardo, N. Kacharov, N. Bastian, M. Hilker, M. Rejkuba, A. Koch, E.K. Grebel and I. Georgiev |
| Sumario: | 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. |
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| Notas: | Gesehen am 14.03.2018 |
| Descripción Física: | Online Resource |
| DOI: | 10.48550/arXiv.1801.09670 |