Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...399..169t&link_type=abstract
Astronomy and Astrophysics, v.399, p.169-175 (2003)
Astronomy and Astrophysics
Astrophysics
17
Methods: Laboratory, Stars: Individual: W 33A, Ism: Abundances, Ism: Molecules, Infrared: Ism, Ism: Lines And Bands
Scientific paper
We obtained near-infrared spectroscopy of the high mass young stellar object W 33A between 1.9-2.5 mu m in search of absorption features of circumstellar ices. The 2.27 mu m band of CH3OH is positively identified in the spectrum, its intensity being fully consistent with the column density derived earlier from the methanol bands at 3.54 and 3.91 mu m. The 2.21 mu m band of solid NH3, on the other hand, was not detected. This shows that the quantity of solid NH3 towards W 33A is at least 3 times lower than earlier estimates based on the NH3 umbrella mode at 9 mu m.
Based on observations obtained at the European Southern Observatory (ESO), Paranal, Chile.
Pontoppidan Klaus Martin
Schutte Willem A.
Taban I. M.
van Dishoeck Ewine F.
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