Astron. J., 137, 3358-3377 (2009/February-0)
The high angular resolution multiplicity of massive stars.
MASON B.D., HARTKOPF W.I., GIES D.R., HENRY T.J. and HELSEL J.W.
Abstract (from CDS):
We present the results of a speckle interferometric survey of Galactic massive stars that complements and expands upon a similar survey made over a decade ago. The speckle observations were made with the Kitt Peak National Observatory and Cerro Tololo Inter-American Observatory 4 m telescopes and USNO speckle camera, and they are sensitive to the detection of binaries in the angular separation regime between 0".03 and 5'' with relatively bright companions (ΔV < 3). We report on the discovery of companions to 14 OB stars. In total we resolved companions of 41 of 385 O-stars (11%), 4 of 37 Wolf-Rayet stars (11%), and 89 of 139 B-stars (64%; an enriched visual binary sample that we selected for future orbital determinations). We made a statistical analysis of the binary frequency among the subsample that are listed in the Galactic O Star Catalog by compiling published data on other visual companions detected through adaptive optics studies and/or noted in the Washington Double Star Catalog and by collecting published information on radial velocities and spectroscopic binaries. We find that the binary frequency is much higher among O-stars in clusters and associations compared to the numbers for field and runaway O-stars, consistent with predictions for the ejection processes for runaway stars. We present a first orbit for the O-star δ Orionis; a linear solution of the close, apparently optical, companion of the O-star ι Orionis; and an improved orbit of the Be star δ Scorpii. Finally, we list astrometric data for another 249 resolved and 221 unresolved targets that are lower mass stars that we observed for various other science programs.
binaries: general - binaries: visual - stars: early-type - stars: individual (iota Ori, delta Ori, delta Sco) - techniques: interferometric
VizieR on-line data:
<Available at CDS (J/AJ/137/3358): table1.dat table2.dat table3.dat table4.dat tablea1.dat tablea2.dat notes.dat refs.dat>
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