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Spectroscopic detection of multiple populations in the ∼2 Gyr old cluster Hodge 6 in the LMC

Journal
Date Issued
2019
Author(s)
Hollyhead, K.
•
Martocchia, S.
•
Lardo, C.
•
Bastian, N.
•
Kacharov, N.
•
Niederhofer, F.
•
Cabrera-Ziri, I.
•
•
Mucciarelli, A.
•
Salaris, M.
•
Usher, C.
DOI
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.
Volume
484
Issue
4
Start page
4718
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2019MNRAS.484.4718H
Rights
open.access
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