Abstract
S106 is an optical bipolar nebula which is elongated in the north-south direction. In the center, there is an infrared source and an ultra-compact H II region, indicating that a young, massive star has been just formed. A high resolution VLA map by Bally et al. (1983) and Felli et al. (1984) revealed a well confined bipolar-shaped H II region with a dust layer in its center. The dust layer which is inclined 25° from the east-west direction is extremely interesting because it seems to indicate that the cold molecular disk is very thin in the central part. A massive molecular core elongated in the east-west direction was observed with CO emission by Bally and Scoville (1982). In the central part, Bieging (1984) reported the detection of a rotating compact disk with HCN emission using the Hat Creek mm-array, which might be a molecular counterpart of the dust layer observed by Bally et al. (1983) and Felli et al. (1984).
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