Stringent upper limits to the solid NH3abundance towards W 33A from near-IR spectroscopy with the Very Large Telescope

Autor:	E. F. van Dishoeck, I. M. Taban, Klaus Pontoppidan, W. A. Schutte
Rok vydání:	2003
Předmět:	Physics Very Large Telescope Space and Planetary Science Abundance (chemistry) Young stellar object Near-infrared spectroscopy High mass Astronomy and Astrophysics Astrophysics Spectroscopy Absorption (electromagnetic radiation) Intensity (heat transfer)
Zdroj:	Astronomy & Astrophysics. 399:169-175
ISSN:	1432-0746 0004-6361
DOI:	10.1051/0004-6361:20021798
Popis:	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 µ mb and 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 µm. The 2.21 µ mb and 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 µm.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ce7bfb67a9da025481be665bbbef39aa https://doi.org/10.1051/0004-6361:20021798 Zobrazit plný text záznamu