Key points are not available for this paper at this time.
Observations of the molecular gas surrounding the biconical H II region S106 reveal a disk of about 100 solar masses constraining the development of the ionized region. Two CO peaks are seen in the equatorial plane of the biconical nebula on opposite sides of a near infrared source thought to be the exciting star for the H II region. Although no systematic velocity gradient is seen for the cloud as a whole, there is a small velocity shift of about 2 km/s in the CO emission from the two peaks. A model is developed for S106 with a B0 exciting star situated in a dense neutral disk, which dominates the dynamics of the nebula. Isothermal expansion of freshly ionized material from the disk drives a supersonic flow of plasma which supplies gas to the two lobes of the H II region.
Bally et al. (Thu,) studied this question.