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http://hdl.handle.net/20.500.12386/30448
Title: | Spectroscopic detection of multiple populations in the ∼2 Gyr old cluster Hodge 6 in the LMC | Authors: | Hollyhead, K. Martocchia, S. Lardo, C. Bastian, N. Kacharov, N. Niederhofer, F. Cabrera-Ziri, I. Dalessandro, Emanuele Mucciarelli, A. Salaris, M. Usher, C. |
Issue Date: | 2019 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 484 | Issue: | 4 | First Page: | 4718 | Abstract: | We report the spectroscopic discovery of abundance spreads (i.e. multiple populations) in the ∼2 Gyr old cluster in the LMC, Hodge 6. We use low-resolution VLT FORS2 spectra of 15 member stars in the cluster to measure their CN and CH band strengths at ≃3883 and 4300 Å, respectively, as well as [C/Fe] and [N/Fe] abundances. We find a subpopulation of two stars that are enriched in nitrogen, and we conclude that this subpopulation is evidence of multiple populations in Hodge 6. This is the second ∼2 Gyr old cluster (the first being NGC 1978 in the LMC) to show multiple populations and the first spectroscopic detection of MPs in a cluster of this age. This result is interesting as it hints at a possible relationship between the disappearance of extended main sequence turn-offs in clusters younger than ∼2 Gyr and the onset of multiple populations at ∼2 Gyr, which should be explored further. | URI: | http://hdl.handle.net/20.500.12386/30448 | URL: | https://academic.oup.com/mnras/article-abstract/484/4/4718/5306459?redirectedFrom=fulltext | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz317 | Bibcode ADS: | 2019MNRAS.484.4718H | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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1902.02297.pdf | preprint | 787.94 kB | Adobe PDF | View/Open |
stz317.pdf | Pdf editoriale | 1.23 MB | Adobe PDF | View/Open |
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