RADIO AND INFRARED STRUCTURE OF THE COLLIDING-WIND WOLF-RAYET SYSTEM WR-147

New, high-resolution infrared and radio images of the X-ray-luminous W olf-Rayet system WR 147 (AS 431) are presented. The 5-GHz radio image resolves both components of this double source. The emission from one component, that to the south and associated with the wind of the WN8 s tar, has an extent of similar to 170 x 253 mas(2), indicating that the stellar wind is not spherically symmetric. The second, non-thermal co mponent similar to 0.6 arcsec north of the WN8 star is extended east-w est to similar to 267 mas. The infrared image reveals the presence of a companion to the WN8 star, close to the non-thermal radio source but slightly (similar to 60 mas) more distant from the WN8 star. The comp anion is Delta K similar to 3 mag fainter than the WN8 star and has a luminosity of a B0.5V star, just sufficiently luminous to possess a st ellar wind capable of colliding with that of the WN8 star. The presenc e of the non-thermal emission between the two stars and much closer to that with the weaker wind is direct evidence for a colliding-wind ori gin for the emission, A significant portion of the X-ray emission can also be accounted for by the release of energy in the wind collision. Comparison of the non-thermal Bur with those of the three systems inco rporating WC-type stars (WR 125, WR 140 and WR 146) shows a correlatio n with velocity of the WR wind.