2003A&A...399..169T

Query : 2003A&A...399..169T

2003A&A...399..169T - Astronomy and Astrophysics, volume 399, 169-175 (2003/2-3)

Stringent upper limits to the solid NH3 abundance towards W 33A from near-IR spectroscopy with the Very Large Telescope.

TABAN I.M., SCHUTTE W.A., PONTOPPIDAN K.M. and VAN DISHOECK E.F.

Abstract (from CDS):

We obtained near-infrared spectroscopy of the high mass young stellar object W 33A between 1.9-2.5µm in search of absorption features of circumstellar ices. The 2.27µm 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 3.91µm. The 2.21µm 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 9µm.

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Journal keyword(s): methods: laboratory - stars: individual: W 33A - ISM: abundances - ISM: molecules - infrared: ISM - ISM: lines and bands

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HD 91713 * 10 35 01.9791667776 -26 22 54.315228612   8.76 7.60     K1III 12 0
2 HD 154066 * 17 03 46.4737629288 -12 51 45.172976472   9.00 8.74     B8V 10 0
3 HD 161961 s*b 17 48 36.8549150712 -02 11 46.295116620 7.45 8.12 7.89     B0.5Ib 62 0
4 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 698 0
5 HD 175876 * 18 58 10.7660947512 -20 25 25.541961636 5.79 6.82 6.94 6.93   O6.5III(n)(f) 149 0
6 IRAS 23118+6110 Y*O 23 14 02.09473 +61 27 18.8460           ~ 376 0

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