New insights into the formation of the blue main sequence in NGC 1850

Yujiao Yang, Chengyuan Li, Licai Deng, Richard De Grijs, Antonino P. Milone

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    Recent discoveries of bimodal main sequences (MSs) associated with young clusters (with ages ≲1 Gyr) in the Magellanic Clouds have drawn a lot of attention. One of the prevailing formation scenarios attributes these split MSs to a bimodal distribution in stellar rotation rates, with most stars belonging to a rapidly rotating population. In this scenario, only a small fraction of stars populating a secondary blue sequence are slowly or non-rotating stars. Here, we focus on the blue MS in the young cluster NGC 1850. We compare the cumulative number fraction of the observed blue-MS stars to that of the high-mass-ratio binary systems at different radii. The cumulative distributions of both populations exhibit a clear anti-correlation, characterized by a highly significant Pearson coefficient of -0.97. Our observations are consistent with the possibility that blue-MS stars are low-mass-ratio binaries, and therefore their dynamical disruption is still ongoing. High-mass-ratio binaries, on the other hand, are more centrally concentrated.

    Original languageEnglish
    Article number98
    Pages (from-to)1-8
    Number of pages8
    JournalAstrophysical Journal
    Issue number2
    Publication statusPublished - 1 Jun 2018

    Bibliographical note

    Copyright 2018 The American Astronomical Society. First published in the Astrophysical journal, 859(2), 98, 2018, published by IOP Publishing. The original publication is available at Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


    • globular clusters: individual (NGC 1850)
    • Hertzsprung-Russell and C-M diagrams
    • Magellanic Clouds


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