Abstract
We present sensitive, high angular resolution (0.3'') Very Large Array observations made at 3.6-cm of the bright infrared source AFGL 4029. We find that the radio source G138.295+1.555, associated with AFGL 4029-IRS1, is actually a subarcsecond binary separated by 0.6'' approximately in the north-south direction. There is also fainter emission extending in the east-west direction and emanating from G138.295+1.555(S), the southern component of the binary. We then identify G138.295+1.555(S) as the exciting source of the optical and molecular outflow observed in this region. G138.295+1.555(S) appears to be one of the few massive young stars associated with a collimated outflow. The northern component of the binary, G138.295+1.555(N), appears to exhibit time-variable radio emission and is proposed to be associated with a T Tauri star. The source G138.300+1.558, associated with AFGL 4029-IRS2, is an ultracompact H II region of cometary morphology, possibly ionized by a B1 ZAMS star.
