SIMBAD references

2015MNRAS.453.2070N - Mon. Not. R. Astron. Soc., 453, 2070-2074 (2015/October-3)

Apparent age spreads in clusters and the role of stellar rotation.

NIEDERHOFER F., GEORGY C., BASTIAN N. and EKSTROM S.

Abstract (from CDS):

We use the Geneva syclist isochrone models that include the effects of stellar rotation to investigate the role that rotation has on the resulting colour-magnitude diagram of young and intermediate age clusters. We find that if a distribution of rotation velocities exists within the clusters, rotating stars will remain on the main sequence for longer, appearing to be younger than non-rotating stars within the same cluster. This results in an extended main sequence turn-off (eMSTO) that appears at young ages ( ∼ 30 Myr) and lasts beyond 1 Gyr. If this eMSTO is interpreted as an age spread, the resulting age spread is proportional to the age of the cluster, i.e. young clusters (<100 Myr) appear to have small age spreads (tens of Myr) whereas older clusters ( ∼ 1 Gyr) appear to have much large spreads, up to a few hundred Myr. We compare the predicted spreads for a sample of rotation rates to observations of young and intermediate age clusters, and find a strong correlation between the measured `age spread' and the age of the cluster, in good agreement with models of stellar rotation. This suggests that the `age spreads' reported in the literature may simply be the result of a distribution of stellar rotation velocities within clusters.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): Hertzsprung-Russell and colour-magnitude diagrams - stars: rotation - galaxies: individual: LMC - galaxies: star clusters: general

Simbad objects: 7

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2019.12.11-13:36:14

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