SIMBAD references

2019MNRAS.484.4718H - Mon. Not. R. Astron. Soc., 484, 4718-4725 (2019/April-3)

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. and USHER C.

Abstract (from CDS):

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.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Magellanic Clouds - galaxies: star clusters: individual: Hodge 6

Nomenclature: Table 1: [HML2019] NNNNN N=37 among (Nos 3581-20569).

Status in Simbad:  being processed

Simbad objects: 15

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2019.12.11-09:42:49

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