Long-baseline interferometric multiplicity survey of the Sco-Cen OB association

A. C. Rizzuto*, M. J. Ireland, J. G. Robertson, Y. Kok, P. G. Tuthill, B. A. Warrington, X. Haubois, W. J. Tango, B. Norris, T. Ten Brummelaar, A. L. Kraus, A. Jacob, C. Laliberte-Houdeville

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    40 Citations (Scopus)


    We present the first multiplicity-dedicated long-baseline optical interferometric survey of the Scorpius-Centaurus-Lupus-Crux association. We used the Sydney University Stellar Interferometer to undertake a survey for new companions to 58 Sco-Cen B-type stars and have detected 24 companions at separations ranging from 7 to 130 mas, 14 of which are new detections. Furthermore, we use a Bayesian analysis and all available information in the literature to determine the multiplicity distribution of the 58 stars in our sample, showingthat the companion frequency is f = 1.35 ± 0.25 and the mass ratio distribution is best described by qγ with γ = -0.46, agreeing with previous Sco-Cen high-mass work and differing significantly from lower mass stars in Tau-Aur. Based on our analysis, we estimate that among young B-type stars in moving groups, up to 23 per cent are apparently single stars.This has strong implications for the understanding of high-mass star formation, which requires angular momentum dispersal through some mechanism such as formation ofmultiple systems.

    Original languageEnglish
    Pages (from-to)1694-1707
    Number of pages14
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number2
    Publication statusPublished - Dec 2013


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