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    Discrepancies in the ages of young star clusters; evidence for mergers?

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    Author
    Beasor, Emma R
    Davies, Ben
    Smith, Nathan
    Bastian, Nate
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2019-06
    Keywords
    blue stragglers
    stars: evolution
    stars: massive
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Emma R Beasor, Ben Davies, Nathan Smith, Nate Bastian, Discrepancies in the ages of young star clusters; evidence for mergers?, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 1, June 2019, Pages 266–273, https://doi.org/10.1093/mnras/stz732
    Journal
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    Rights
    © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    There is growing evidence that star clusters can no longer be considered simple stellar populations. Intermediate- and old-age clusters are often found to have extended main-sequence turn-offs (eMSTOs) which are difficult to explain with single-age isochrones, an effect attributed to rotation. In this paper, we provide the first characterization of this effect in young (<20 Myr) clusters. We determine ages for four young massive clusters (2 Large Magellanic Cloud and 2 Galactic) by three different methods: using the brightest single turn-off (TO) star; using the luminosity function (LF) of the TO; and by using the lowest L-bol red supergiant (RSG). The age found using the cluster TO is consistently younger than the age found using the lowest RSG L-bol. Under the assumption that the lowest luminosity RSG age is the 'true' age, we argue that the eMSTOs of these clusters cannot be explained solely by rotation or unresolved binaries. We speculate that the most luminous stars above the TO are massive blue straggler stars formed via binary interaction, either as mass gainers or merger products. Therefore, using the cluster TO method to infer ages and initial masses of post-MS stars, such as Wolf-Rayet stars, luminous blue variables, and RSGs, will result in ages inferred being too young and masses too high.
    ISSN
    0035-8711
    EISSN
    1365-2966
    DOI
    10.1093/mnras/stz732
    Version
    Final published version
    Sponsors
    STFC doctoral studentship; Royal Society (University Research Fellowship); European Research Council [ERC-CoG-646928-Multi-Pop]
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stz732
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    UA Faculty Publications

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