2002A&A...394.1057D

Query : 2002A&A...394.1057D

2002A&A...394.1057D - Astronomy and Astrophysics, volume 3941057-1068 (2002/11-2)

Combined VLT ISAAC/ISO SWS spectroscopy of two protostellar sources. The importance of minor solid state features.

DARTOIS E., D'HENDECOURT L., THI W., PONTOPPIDAN K.M. and VAN DISHOECK E.F.

Abstract (from CDS):

We discuss the L band infrared spectra of two massive protostars in the region of the so-called 3.47µm absorption feature. The high sensitivity VLT-ISAAC spectra of the two differently evolved massive protostars GL 989 and GL 2136, together with dedicated infrared laboratory experiments on ice molecular interactions, allow us to propose the identification of this feature with the formation of an ammonia hydrate. Combined with an analysis of additional ISO observations, the derived ratio of solid NH3/H2O present in ice mantles is less than or equal to 7%. This amount fits well with the nitrogen cosmic abundance and the chemical evolution of ices where other nitrogen containing OCN– and NH4+ ions are observed.

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Journal keyword(s): ISM: individual objects: GL 2136, GL 989 - stars: formation - astrochemisty

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 RAFGL 490 Or* 03 27 38.7928952784 +58 47 00.025298088           ~ 359 0
2 RAFGL 989 Y*O 06 41 10.1587451112 +09 29 33.635220144   17.4 16.8 18.26 17.28 B2 271 0
3 OH 231.8+04.2 OH* 07 42 16.947 -14 42 50.20           M10III+A 548 0
4 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
5 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
6 RAFGL 2136 Y*O 18 22 26.52888 -13 30 14.0400           ~ 300 0
7 RAFGL 7009S HII 18 34 20.911 -05 59 42.23           ~ 231 0
8 HH 100 HH 19 01 49.1 -36 58 16           ~ 82 0
9 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 640 0
10 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 668 2
11 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 600 0
12 IRAS 23118+6110 Y*O 23 14 02.09473 +61 27 18.8460           ~ 385 0

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