Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection

Abstract

Multiplicity is one of the most fundamental observable properties of massive O-type stars and offers a promising way to discriminate between massive star formation theories. Nevertheless, companions at separations between 1 and 100 mas remain mostly unknown due to intrinsic observational limitations. [...] The Southern MAssive Stars at High angular resolution survey (SMASH+) was designed to fill this gap by providing the first systematic interferometric survey of Galactic massive stars. We observed 117 O-type stars with VLTI/PIONIER and 162 O-type stars with NACO/SAM, respectively probing the separation ranges 1-45 and 30-250mas and brightness contrasts of Delta H < 4 and Delta H < 5. Taking advantage of NACO's field-of-view, we further uniformly searched for visual companions in an 8''-radius down to Delta H = 8. This paper describes the observations and data analysis, reports the discovery of almost 200 new companions in the separation range from 1mas to 8'' and presents the catalog of detections, including the first resolved measurements of over a dozen known long-period spectroscopic binaries. Excluding known runaway stars for which no companions are detected, 96 objects in our main sample (DEC < 0 deg; H<7.5) were observed both with PIONIER and NACO/SAM. The fraction of these stars with at least one resolved companion within 200mas is 0.53. Accounting for known but unresolved spectroscopic or eclipsing companions, the multiplicity fraction at separation < 8'' increases to f_m = 0.91 +/- 0.03. The fraction of luminosity class V stars that have a bound companion reaches 100% at 30mas while their average number of physically connected companions within 8'' is f_c = 2.2 +/- 0.3. This demonstrates that massive stars form nearly exclusively in multiple systems. Additionally, the nine non-thermal (NT) radio emitters observed by SMASH+ are all resolved [...]

57 pages, 20 figures, 7 tables; accepted for publication in ApJS

References in corpus (16)

• Binary interaction dominates the evolution of massive stars
• The High Angular Resolution Multiplicity of Massive Stars
• Radiation-Hydrodynamic Simulations of Collapse and Fragmentation in Massive Protostellar Cores
• UBVJHK synthetic photometry of Galactic O stars
• Fragmentation of Massive Protostellar Disks
• Non-thermal emission processes in massive binaries
• Adaptive Optics Photometry and Astrometry of Binary Stars. III. A Faint Companion Search of O-Star Systems
• Pismis 24-1: The Stellar Upper Mass Limit Preserved
• High resolution optical spectroscopy of Plaskett's star
• The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems
• HD148937: a multiwavelength study of the third Galactic member of the Of?p class
• Can single O stars produce non-thermal radio emission?
• An XMM-Newton view of the young open cluster NGC 6231 -- I. The catalogue
• The Long Period, Massive Binaries HD 37366 and HD 54662: Potential Targets for Long Baseline Optical Interferometry
• HD 152246 - a new high-mass triple system and its basic properties
• The Three body system delta Circini

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