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A quantitative study of O stars in NGC 2244 and the Monoceros OB2 association
Aims. Our goal is to determine the stellar and wind properties of seven O stars in the cluster NGC 2244 and three O stars in the OB association Mon OB2. These properties give us insight into the mass… Expand
Three-dimensional orbits of the triple-O stellar system HD 150136 ?
Context. HD 150136 is a triple hierarchical system and a non-thermal radio emitter. It is formed by an O3 3.5 V + O5.5 6 V close binary and a more distant O6.5 7 V tertiary. So far, only the inner… Expand
Evidence for a physically bound third component in HD 150136
Context. HD 150136 is one of the nearest systems harbouring an O3 star. Although this system was considered for a long time as a binary, more recent investigations have suggested the possible… Expand
Variability in the CoRoT photometry of three hot O-type stars HD 46223, HD 46150, and HD 46966
Context. The detection of pulsational frequencies in stellar photometry is required as input for asteroseismological modelling. The second short run (SRa02) of the CoRoT mission has provided… Expand
No signature of the orbital motion of a putative 70 solar mass black hole in LB-1.
Liu et al. (2019) recently reported the detection of a 68 [+11/-13] solar mass (Msun) black hole (BH) paired with an 8.2 [+0.9/-1.2] Msun B-type sub-giant star in the 78.9-day spectroscopic binary… Expand
A modern study of HD 166734: a massive supergiant system
Aims. HD 166734 is an eccentric eclipsing binary system composed of two supergiant O-type stars, orbiting with a 34.5-day period. In this rare configuration for such stars, the two objects mainly… Expand
A spectroscopic investigation of the O-type star population in four Cygnus OB associations I. Determination of the binary fraction
Context. Establishing the multiplicity of O-type stars is the first st ep towards accurately determining their stellar parameters. Moreover, the distribution of the orbital parameters provi des… Expand
The mass of the very massive binary WR21a
We present multi-epoch spectroscopic observations of the massive binary system WR21a, which include the 2011 January periastron passage. Our spectra reveal multiple SB2 lines and facilitate an… Expand
The 2.35 year itch of Cygnus OB2 #9. I. Optical and X-ray monitoring
Context. Nonthermal radio emission in massive stars is expected to arise in wind-wind collisions occurring inside a binary system. One such case, the O-type star Cyg OB2 #9, was proven to be a binary… Expand
9 Sagittarii: uncovering an O-type spectroscopic binary with an 8.6 year period
Context. The O-type object 9 Sgr is a well-known synchrotron radio emitter. This feature is usually attributed to colliding-wind binary systems, but 9 Sgr was long considered a single star. Aims. We… Expand