Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud - V. Multiple populations in ancient globular clusters

We examine four ancient LargeMagellanic Cloud (LMC) globular clusters (GCs) for evidence of multiple stellar populations using the Advanced Camera for Surveys andWide Field Camera 3 on the Hubble Space Telescope Programme GO-14164. NGC 1466, NGC 1841, and NGC 2257 all show evidence for a redder, sec...

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Bibliographic Details
Authors: Gilligan, Christina K., Chaboyer, Brian, Cummings, Jeffrey D., Mackey, Dougal, Cohen, Roger E., Geisler, Douglas, Grocholski, Aaron J., Parisi, Maria Celeste, Sarajedini, Ata, Ventura, Paolo, Villanova, Sandro, Yang, Soung-Chul, Wagner-Kaiser, Rachel
Format: article
Status:Published version
Publication Date:2020
Country:Argentina
Institution:Consejo Nacional de Investigaciones Científicas y Técnicas
Repository:CONICET Digital (CONICET)
Language:English
OAI Identifier:oai:ri.conicet.gov.ar:11336/141088
Online Access:http://hdl.handle.net/11336/141088
Access Level:Open access
Keyword:GALAXIES: STAR CLUSTERS: INDIVIDUAL: (NGC 1466, NGC 1841, NGC 2257, RETICULUM)
MAGELLANIC CLOUDS
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Description
Summary:We examine four ancient LargeMagellanic Cloud (LMC) globular clusters (GCs) for evidence of multiple stellar populations using the Advanced Camera for Surveys andWide Field Camera 3 on the Hubble Space Telescope Programme GO-14164. NGC 1466, NGC 1841, and NGC 2257 all show evidence for a redder, secondary population along themain sequence. Reticulum does not showevidence for the presence of a redder population, but thisGChas the least number of stars and Monte Carlo simulations indicate that the sample of main-sequence stars is too small to robustly infer whether a redder population exists in this cluster. The second, redder, population of the other three clusters constitutes ∼ 30 - 40 per cent of the total population along the main sequence. This brings the total number of ancient LMC GCs with known split or broadened main sequences to five. However, unlike for Hodge 11 and NGC 2210 (see Gilligan et al. (2019)), none of the clusters shows evidence for multiple populations in the horizontal branch. We also do not find evidence of a second population along the red giant branch.

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