Long-Baseline Interferometric Multiplicity Survey of the Sco-Cen OB Association
Abstract
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 7-130mas, 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, showing that the companion frequency is F = 1.35 and the mass ratio distribution is best described as a power law with exponent equal to -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% 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 of multiple systems.
Keywords
Cite
@article{arxiv.1309.3811,
title = {Long-Baseline Interferometric Multiplicity Survey of the Sco-Cen OB Association},
author = {A. C. Rizzuto and M. J. Ireland and J. G. Robertson and Y. Kok and P. G. Tuthill and B. A. Warrington and X. Haubois and W. J. Tango and B. Norris and T. ten Brummelaar and A. L. Kraus and A. Jacob and C. Laliberte-Houdeville},
journal= {arXiv preprint arXiv:1309.3811},
year = {2015}
}
Comments
7 figures, 5 tables, accepted for publication in MNRAS