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Given the rarity of young O star candidates, compact HII regions embedded indense molecular cores continue to serve as potential sites to peer into thedetails of high-mass star formation. To uncover the ionizing sources of themost luminous and compact HII regions embedded in the RCW106 and RCW122 giantmolecular clouds, known to be relatively nearby (2-4 kpc) and isolated, thusproviding an opportunity to examine spatial scales of a few hundred to athousand AU in size. High spatial resolution (0.3"), mid-infrared spectra(R=350), including the fine structure lines [ArIII] and [NeII], were obtainedfor four luminous compact HII regions, embedded inside the dense cores withinthe RCW106 and RCW122 molecular cloud complexes. At this resolution, thesetargets reveal point-like sources surrounded by nebulosity of differentmorphologies, uncovering details at spatial dimensions of <1000AU. Thepoint-like sources display [ArIII] and [NeII] lines - the ratios of which areused to estimate the temperature of the embedded sources. The derivedtemperatures are indicative of mid-late O type objects for all the sources with[ArIII] emission. Previously known characteristics of these targets from theliterature, including evidence of disk or accretion suggest that the identifiedsources may grow more to become early-type O stars by the end of the starformation process.

The ionizing sources of luminous compact HII regions in the RCW106 and RCW122 clouds