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Spectroscopic detection of multiple populations in the er Hodge 6 in the LMC

Hollyhead, K, Martocchia, S, Lardo, C, Bastian, N, Kacharov, N, Niederhofer, F, Cabrera-Ziri, I, Dalessandro, E, Mucciarelli, A, Salaris, M and Usher, CG (2019) Spectroscopic detection of multiple populations in the er Hodge 6 in the LMC. Monthly Notices of the Royal Astronomical Society, 484 (4). pp. 4718-4725. ISSN 0035-8711

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Abstract

We report the spectroscopic discovery of abundance spreads (i.e. multiple populations) in the 1/42 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 1/42 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 1/42 Gyr and the onset of multiple populations at 1/42 Gyr, which should be explored further.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 18 Mar 2019 10:15
Last Modified: 18 Mar 2019 11:00
DOI or Identification number: 10.1093/mnras/stz317
URI: http://researchonline.ljmu.ac.uk/id/eprint/10360

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