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Paper: Sparse Aperture Masking of Massive Stars
Volume: 465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat
Page: 363
Authors: Sana, H.; Lacour, S.; Le Bouquin, J.; de Koter, A.; Moni-Bidin, C.; Muijres, L.; Schnurr, O.; Zinnecker, H.
Abstract: We present the earliest results of our NACO/VLT sparse aperture masking campaign on a sample of 60 O-type stars. We detect Δ Ks < 5 mag companions for 20–25% of our targets with separations in the range 30–100 mas (typically, 40–200 A.U.). Most of these companions were unknown, shedding thus new light on the multiplicity properties of the massive stars in a separation and brightness regime that has been difficult to explore so far. Adding detections from other techniques (spectroscopy, interferometry, speckle, lucky imaging, AO), the fraction of O stars with at least one companion is 85% (51/60 targets). This is the largest multiplicity fraction ever found.
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