Evolution of Southern Star-Forming Regions
Thi, W. F.; Burgdorf, M.; van Dishoeck, E. F.; Schutte, W. A.; Tielens, A. G. G. M.; Ehrenfreund, P.; Cami, J.; van Hoof, P.
Netherlands, Spain
Abstract
We present ISO observations of bright, high-mass southern starforming regions with the Short Wavelength Spectrometer (SWS) and Long Wavelength Spectrometer (LWS). The selected targets show a range of pre-main sequence evolutionary phases. Whereas some objects still show interstellar ice features, the most evolved objects are coincident with ultra-compact HII regions and show strong emission lines from atomic species and polycyclic aromatic hydrocarbons (PAHs). We discuss the ISO spectra between 2.5 - 200 µm of selected southern star-forming regions in the context of their evolution.