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Paper: Ices and Gas in Star Forming Regions as Seen with VLT-ISAAC Spectroscopy
Volume: 287, Galactic Star Formation Across the Stellar Mass Spectrum
Page: 187
Authors: Dartois, E.; D'Hendecourt, L.; Thi, W.-F.; Pontopiddan, K.; Schutte, W.; van Dishoeck, E. F.
Abstract: We present a low and medium resolution spectra survey of young stellar objects of intermediate mass as well as of a few with high mass. These lines of sight were observed between 2.8 and 5.1 μm using ISAAC mounted on VLT-UT1 to follow the astrochemical evolution of solid matter surrounding embedded young stellar objects. Besides the study of the H2O and CO ice features in intermediate mass southern clouds objects (S 1), the VLT 8-m class telescopes were also used to search for weaker features tracing chemical interactions, such as the formation of ammonia hydrates (S 3), HDO (S 5) OD stretching vibration, the so-called ``XCN'' feature, and to observe CH3OH. K-band (2.2μm) spectroscopy also offers an access to very faint absorptions, adding additional constraints (S 4). We can also make a comparison with the excitation of gas phase CO lines observed with the same instrument along the lines of sight (S 2). These observations are compared to models and laboratory data in order to provide insight into the chemical history, and chemical differences between the well studied high mass stars and fainter sources now accessible.
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