HD 93129A at different radio scales

Recent observations toward the O2 If* star HD 93129A have revealed important non-thermal radio emission, and that it has an early O companion 140 AU away if at 2.5 kpc (FGS-HST data). These facts strongly support the possibility of a massive stars wind-collision region as the acceleration site of the synchrotron-emitting relativistic electrons. We have carried out LBA VLBI observations at 2.37 GHz to resolve the non-thermal source, and search for a bow-shock shape, typical of a wind-collision region. Preliminary results are presented here.Fil: Benaglia, Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto Argentino de Radioastronomia (i); ArgentinaFil: Dougherty, S. M.. National Research Council of Canada, Herzberg Institute for Astrophysics, Dominion Radio Astrophysical Observatory; CanadáFil: Phillips, C.. Australia Telescope National Facility, CSIRO; AustraliaFil: Koribalski, B.. Australia Telescope National Facility, CSIRO; AustraliaFil: Tzioumis, T.. Australia Telescope National Facility, CSIRO; Australi