Spectroscopic detection of multiple populations in the ̃2 Gyr old cluster Hodge 
6 in the LMC

Hollyhead, K.; Martocchia, S.; Lardo, C.; Bastian, N.; Kacharov, N.; Niederhofer, F.; Cabrera-Ziri, I.; Dalessandro, E.; Mucciarelli, A.; Salaris, M.; Usher, C.

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Journal Article

Spectroscopic detection of multiple populations in the ̃2 Gyr old cluster Hodge 6 in the LMC

MPS-Authors

Hollyhead, K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martocchia, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lardo, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bastian, N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kacharov, N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Niederhofer, F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cabrera-Ziri, I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dalessandro, E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mucciarelli, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Salaris, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Usher, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019MNRAS.484.4718H
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Citation

Hollyhead, K., Martocchia, S., Lardo, C., Bastian, N., Kacharov, N., Niederhofer, F., et al. (2019). Spectroscopic detection of multiple populations in the ̃2 Gyr old cluster Hodge 6 in the LMC. Monthly Notices of the Royal Astronomical Society, 484, 4718-4725.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D0EC-6

Abstract

We report the spectroscopic discovery of abundance spreads (i.e. multiple populations) in the ̃2 Gyr old cluster in the LMC, Hodge 6. We use low-resolution VLT FORS2 spectra of 15 member stars in the cluster to measure their CN and CH band strengths at ≃3883 and 4300 Å, respectively, as well as [C/Fe] and [N/Fe] abundances. We find a subpopulation of two stars that are enriched in nitrogen, and we conclude that this subpopulation is evidence of multiple populations in Hodge 6. This is the second ̃2 Gyr old cluster (the first being NGC 1978 in the LMC) to show multiple populations and the first spectroscopic detection of MPs in a cluster of this age. This result is interesting as it hints at a possible relationship between the disappearance of extended main sequence turn-offs in clusters younger than ̃2 Gyr and the onset of multiple populations at ̃2 Gyr, which should be explored further.