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An analysis of the population of extended main-sequence turn-off clusters in the Large Magellanic Cloud

Piatti, AE and Bastian, N (2016) An analysis of the population of extended main-sequence turn-off clusters in the Large Magellanic Cloud. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 463 (2). ISSN 0035-8711

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Open Access URL: https://arxiv.org/pdf/1608.04554.pdf (Accepted version)


We combine a number of recent studies of the extended main-sequence turn-off (eMSTO) phenomenon in intermediate age stellar (1–2 Gyr) clusters in the Large Magellanic Cloud (LMC) in order to investigate its origin. By employing the largest sample of eMSTO LMC clusters so far used, we show that cluster core radii, masses, and dynamical state are not related to the genesis of eMSTOs. Indeed, clusters in our sample have core radii, masses and age-relaxation time ratios in the range ≈2–6 pc, 3.35–5.50 (log(Mcls/M⊙) and 0.2–8.0, respectively. These results imply that the eMSTO phenomenon is not caused by actual age spreads within the clusters. Furthermore, we confirm from a larger cluster sample recent results including young eMSTO LMC clusters, that the full width at half-maximum at the MSTOs correlates most strongly with cluster age, suggesting that a stellar evolutionary effect is the underlying cause.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Mon Not R Astron Soc (2016) 463 (2): 1632-1641. is available online at: https://doi.org/10.1093/mnras/stw2071
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
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Date Deposited: 10 Apr 2017 14:14
Last Modified: 20 Apr 2022 09:31
DOI or ID number: 10.1093/mnras/stw2071
URI: https://researchonline.ljmu.ac.uk/id/eprint/5759
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