The binary fraction in the globular cluster M10 (NGC6254): Comparing core and outer regions

E. Dalessandro, B. Lanzoni, G. Beccari, A. Sollima, F. R. Ferraro, M. Pasquato

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We study the binary fraction of the globular cluster M10 (NGC6254) as a function of the radius from the cluster core to the outskirts, by means of a quantitative analysis of the color distribution of stars relative to the fiducial main sequence. By taking advantage of two data sets, acquired with the Advanced Camera for Survey and the Wide Field Planetary Camera 2 on board the Hubble Space Telescope, we have studied both the core and the external regions of the cluster. The binary fraction is found to decrease from ∼14% within the core, to ∼1.5% in a region between 1 and 2 half-mass radii from the cluster center. Such a trend and the derived values are in agreement with previous results obtained in clusters of comparable total magnitude. The estimated binary fraction is sufficient to account for the suppression of mass segregation observed in M10, without any need to invoke the presence of an intermediate-mass black hole in its center.

    Original languageEnglish (US)
    Article number11
    JournalAstrophysical Journal
    Volume743
    Issue number1
    DOIs
    StatePublished - Dec 10 2011

    Keywords

    • binaries: general
    • globular clusters: individual (M10, NGC 6254)

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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