Evidence for multiple populations in 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, Andreas and Grebel, E.K. and Georgiev, I. (2017) Evidence for multiple populations in intermediate age cluster Lindsay 1 in the SMC. Monthly Notices of the Royal Astronomical Society, 465 (1). L39-L43. ISSN 0035-8711

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Abstract

Lindsay 1 is an intermediate age (≈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 Å 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:
Journal Article
Journal or Publication Title:
Monthly Notices of the Royal Astronomical Society
Additional Information:
This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices Letters of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version K. Hollyhead, N. Kacharov, C. Lardo, N. Bastian, M. Hilker, M. Rejkuba, A. Koch, E. K. Grebel, and I. Georgiev Evidence for multiple populations in the intermediate-age cluster Lindsay 1 in the SMC MNRAS (February 11, 2017) Vol. 465 L39-L43 doi:10.1093/mnrasl/slw179 first published online September 12, 2016 is available online at: http://mnrasl.oxfordjournals.org/cgi/content/abstract/465/1/L39
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
ID Code:
82088
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Deposited On:
10 Oct 2016 10:36
Refereed?:
Yes
Published?:
Published
Last Modified:
07 Apr 2020 04:10