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  • 1609.01302v1

    Rights statement: 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

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

Research output: Contribution to journalJournal article

Published
  • K. Hollyhead
  • N. Kacharov
  • C. Lardo
  • N. Bastian
  • M. Hilker
  • M. Rejkuba
  • Andreas Koch
  • E.K. Grebel
  • I. Georgiev
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<mark>Journal publication date</mark>11/02/2017
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number1
Volume465
Number of pages5
Pages (from-to)L39-L43
Publication statusPublished
Early online date12/09/16
Original languageEnglish

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.

Bibliographic note

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