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Evidence for multiple populations in the intermediate age cluster Lindsay 1 in the SMC

Hollyhead, K and Kacharov, N and Lardo, C and Bastian, N and Hilker, M and Rejkuba, M and Koch, A and Grebel, EK and Georgiev, I (2017) Evidence for multiple populations in the intermediate age cluster Lindsay 1 in the SMC. Monthly Notices of the Royal Astronomical Society Letters, 465 (1). L39-L43. ISSN 1745-3933

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Abstract

Lindsay 1 is an intermediate age (approx 8 Gyr) massive cluster in the Small Magellanic Cloud (SMC). Using VLT FORS2 spectra of 16 probable cluster members on the lower RGB of the cluster, we measure CN and CH band strengths (at 3883 and 4300 Angstroms respectively), along with carbon and nitrogen abundances and find that a sub-population of stars has significant nitrogen enrichment. A lack of spread in carbon abundances excludes evolutionary mixing as the source of this enrichment, so we conclude that this is evidence of multiple populations. Therefore, L1 is the youngest cluster to show such variations, implying that the process triggering the onset of multiple populations must operate until at least redshift ~1.

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 Letters following peer review. The version of record MNRAS Evidence for multiple populations in the intermediate age cluster Lindsay 1 in the SMC. Hollyhead et al. (February 11, 2017) 465 (1): L39-L43. doi: 10.1093/mnrasl/slw179] is available online at: http://dx.doi.org/10.1093/mnrasl/slw179
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
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Date Deposited: 22 Nov 2016 11:31
Last Modified: 08 Sep 2017 01:51
DOI or Identification number: 10.1093/mnrasl/slw179
URI: http://researchonline.ljmu.ac.uk/id/eprint/4832

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