Stellar rotation bifurcation caused by tidal locking in the open cluster NGC 2287?

Weijia Sun*, Chengyuan Li, Licai Deng, Richard De Grijs

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    Abstract

    We present a detailed analysis of the projected stellar rotational velocities of the well-separated double main sequence (MS) in the young, ∼200 Myr-old Milky Way open cluster NGC 2287 and suggest that stellar rotation may drive the split MSs in NGC 2287. We find that the observed distribution of projected stellar rotation velocities could result from a dichotomous distribution of stellar rotation rates. We discuss whether our observations may reflect the effects of tidal locking affecting a fraction of the cluster's member stars in stellar binary systems. The slow rotators are likely stars that initially rotated rapidly but subsequently slowed down through tidal locking induced by low-mass-ratio binary systems. However, the cluster may have a much larger population of short-period binaries than is usually seen in the literature, with relatively low secondary masses.

    Original languageEnglish
    Title of host publicationStar clusters: from the Milky Way to the early universe
    Subtitle of host publicationProceedings of the 351st symposium of the International Astronomical Union held in Bologna, Italy, 27-31 May 2019
    EditorsAngela Bragaglia, Melvyn Davies, Alison Sills, Enrico Vesperini
    Place of PublicationCambridge
    PublisherCambridge University Press (CUP)
    Pages228-232
    Number of pages5
    ISBN (Print)9781108482509
    DOIs
    Publication statusPublished - 11 Mar 2020
    Event351st symposium of the International Astronomical Union - Bologna, Italy
    Duration: 27 May 201931 May 2019

    Publication series

    NameProceedings of the International Astronomical Union
    PublisherCambridge University Press
    NumberS351
    Volume14
    ISSN (Print)1743-9213

    Conference

    Conference351st symposium of the International Astronomical Union
    Country/TerritoryItaly
    CityBologna
    Period27/05/1931/05/19

    Keywords

    • galaxies: star clusters: general
    • open clusters and associations: individual: NGC 2287
    • stars: rotation

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