Volume 399, Number 1, February III 2003
|Page(s)||169 - 175|
|Section||Interstellar and circumstellar matter|
|Published online||05 February 2003|
Stringent upper limits to the solid NH3 abundance towards W 33A from near-IR spectroscopy with the Very Large Telescope*
Raymond and Beverly Sackler Laboratory for Astrophysics, Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands
2 Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands
Corresponding author: W. A. Schutte, email@example.com
Accepted: 14 November 2002
We obtained near-infrared spectroscopy of the high mass young stellar object W 33A between 1.9–2.5 μm in search of absorption features of circumstellar ices. The 2.27 μm band of 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 μm. The 2.21 μm band of solid , on the other hand, was not detected. This shows that the quantity of solid towards W 33A is at least 3 times lower than earlier estimates based on the umbrella mode at 9 μm.
Key words: methods: laboratory / stars: individual: W 33A / ISM: abundances / ISM: molecules / infrared: ISM / ISM: lines and bands
© ESO, 2003
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