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A young cluster with an extended main-sequence turnoff: Confirmation of a prediction of the stellar rotation scenario

Bastian, N and Niederhofer, F and Kozhurina-Platais, V and Salaris, M and Larsen, S and Cabrera-Ziri, I and Cordero, M and Ekstrom, S and Geisler, D and Georgy, C and Hilker, M and Kacharov, N and Li, C and Mackey, D and Mucciarelli, A and Platais, I (2016) A young cluster with an extended main-sequence turnoff: Confirmation of a prediction of the stellar rotation scenario. Monthly Notices of the Royal Astronomical Society: Letters, 460 (1). L20-L24. ISSN 1745-3933

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Abstract

We present Hubble Space Telescope photometry of NGC 1850, a ~100 Myr, ~105 M⊙ cluster in the Large Magellanic Cloud. The colour-magnitude diagram clearly shows the presence of an extended main-sequence turnoff (eMSTO). The use of non-rotating stellar isochrones leads to an age spread of ~40 Myr. This is in good agreement with the age range expected when the effects of rotation in the main-sequence turnoff (MSTO) stars are wrongly interpreted in terms of age spread. We also do not find evidence for multiple, isolated episodes of star formation bursts within the cluster, in contradiction to scenarios that invoke actual age spreads to explain the eMSTO phenomenon. NGC 1850 therefore continues the trend of eMSTO clusters, where the inferred age spread is proportional to the age of the cluster. While our results confirm a key prediction of the scenario where stellar rotation causes the eMSTO feature, direct measurements of the rotational rate of MSTO stars is required to definitively confirm or refute whether stellar rotation is the origin of the eMSTO phenomenon or if it is due to an as yet undiscovered effect. © 2016 The Authors.

Item Type: Article
Additional Information: This is the accepted version of the following article: A young cluster with an extended main-sequence turnoff: Confirmation of a prediction of the stellar rotation scenario MNRAS (July 21, 2016) 460 (1): L20-L24. , which has been published in final form at http://dx.doi.org/10.1093/mnrasl/slw067 http://olabout.wiley.com/WileyCDA/Section/id-820227.html
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Wiley
Date Deposited: 28 Jul 2016 10:57
Last Modified: 28 Jul 2016 10:57
DOI or Identification number: 10.1093/mnrasl/slw067
URI: http://researchonline.ljmu.ac.uk/id/eprint/3958

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