Recent results of radio observations on Particle-Accelerating Colliding-Wind Binaries

Synchrotron radiation identified in the radio domain for several tens of binary systems made of massive stars provides compelling evidence that a particle acceleration process is at work in these objects, hence their Particle-Accelerating Colliding-Wind Binaries (PACWB) status. Measurements of the synchrotron radio emission allow to investigate the non-thermal physics and to derive some of their properties. In this talk, I will present recent results about radio observations of two massive binaries previously claimed to be non-thermal radio emitters, though more recent results suggest the situation if more complex than expected. The radio emission from neighbouring sources will also be briefly discussed, in particular in the context of the gamma-ray emission that has been detected close to one of these systems.