Abstract
The faint nebulosity GM24 = PP8S was observed at infrared (1-20 m) and radio (6cm and CO line) wavelengths in the vicinity of a CO "hot spot" reported previously. Radio continuum (6cm) emission from an H II region was detected with the Very Large Array. Its position coincides with a 1-4 m emission peak. GM24 appears to be the visible part of an obscured H II region that is beginning to emerge from the molecular cloud. Our infrared maps made at the Observatorio Astron6mico Nacional at San Pedro Martir, show two additional (1-20 m) peaks located at distances \ 30 arcsec from the compact H II region, all surrounded by extended near-infrared (14 m) emission. A detailed CO (J = 1 0) map of the whole molecular cloud was obtained with the University of Texas MillimeterWave Telescope. High resolution spectroscopy of the Hα line was also obtained with the Anglo-Australian Telescope. Our results are interpreted in terms of recent formation of three massive stars; one of which, having developed an H II region, is at a slightly later phase of its evolution. The extended near-infrared emission may arise in a reflection nebula similar to NGC 7538-Irs 9.
