Abstract
The authors present VLA observations of the ultracompact H II region GM 24 in the H 76α line and 2-cm continuum with an angular resolution of ≡1arcsec. The radio coninuum shows a blister morphology, with the southern edge sharply bounded. The northern parts of the radio source extend over ≡15arcsec and connect with the optical nebulosity. There is also evidence for a velocity gradient across the face of the H II region, with the northern part blueshifted by 6 - 8 km s-1 with respect to the southern part. The authors conclude that GM 24 is a blister H II region that has bursted out of its parent molecular cloud and is undergoing the champagne phase.
