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A high fraction of Be stars in young massive clusters: evidence for a large population of near-critically rotating stars

Bastian, NJ and Cabrera-Ziri, I and Niederhofer, F and de Mink, SE and Georgy, C and Baade, D and Correnti, M and Usher, CG and Romaniello, M (2017) A high fraction of Be stars in young massive clusters: evidence for a large population of near-critically rotating stars. Monthly Notices of the Royal Astronomical Society, 465 (4). pp. 4795-4799. ISSN 0035-8711

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Abstract

Recent photometric analysis of the colour-magnitude diagrams (CMDs) of young massive clusters (YMCs) have found evidence for splitting in the main sequence and extended main sequence turn-offs, both of which have been suggested to be caused by stellar rotation. Comparison of the observed main sequence splitting with models has led various authors to suggest a rather extreme stellar rotation distribution, with a minority (10−30\%) of stars with low rotational velocities and the remainder (70−90\%) of stars rotating near the critical rotation (i.e., near break-up). We test this hypothesis by searching for Be stars within two YMCs in the LMC (NGC 1850 and NGC 1856), which are thought to be critically rotating stars with decretion disks that are (partially) ionised by their host stars. In both clusters we detect large populations of Be stars at the main sequence turn-off (∼30−60\% of stars), which supports previous suggestions of large populations of rapidly rotating stars within massive clusters.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record A high fraction of Be stars in young massive clusters: evidence for a large population of near-critically rotating stars N. Bastian, I. Cabrera-Ziri F. Niederhofer S. de Mink C. Georgy D. Baade M. Correnti C. Usher M. Romaniello MNRAS (2016) 465 (4): 4795-4799. is available online at: https://doi.org/10.1093/mnras/stw3042
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 03 Feb 2017 09:17
Last Modified: 06 Sep 2017 23:03
DOI or Identification number: 10.1093/mnras/stw3042
URI: http://researchonline.ljmu.ac.uk/id/eprint/5087

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