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
Accepted author manuscript, 2.13 MB, PDF document
Available under license: CC BY: Creative Commons Attribution 4.0 International License
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Evidence for multiple populations in intermediate age cluster Lindsay 1 in the SMC
AU - Hollyhead, K.
AU - Kacharov, N.
AU - Lardo, C.
AU - Bastian, N.
AU - Hilker, M.
AU - Rejkuba, M.
AU - Koch, Andreas
AU - Grebel, E.K.
AU - Georgiev, I.
N1 - 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
PY - 2017/2/11
Y1 - 2017/2/11
N2 - 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.
AB - 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.
KW - Mageellanic Clouds
KW - galaxies: star clusters: individual: Lindsay 1
U2 - 10.1093/mnrasl/slw179
DO - 10.1093/mnrasl/slw179
M3 - Journal article
VL - 465
SP - L39-L43
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 1
ER -