2002A&A...394.1057D


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET06:33:30

2002A&A...394.1057D - Astronomy and Astrophysics, volume 394, 1057-1068 (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.

Abstract Copyright:

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 - 2021
#notes
1 RAFGL 490 Y*O 03 27 38.7928323987 +58 47 00.017662871           ~ 341 0
2 RAFGL 989 Y*O 06 41 10.1592954288 +09 29 33.635497596   17.4 16.8 18.26 17.28 B2 245 0
3 OH 231.8 +4.2 OH* 07 42 16.947 -14 42 50.20           M10III+A 509 1
4 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3599 3
5 W 33a Y*O 18 14 39.0 -17 52 03           ~ 593 0
6 RAFGL 2136 SFR 18 22 26.8740 -13 30 17.177           ~ 254 0
7 RAFGL 7009S HII 18 34 20.911 -05 59 42.23           ~ 197 0
8 HH 100 HH 19 01 49.1 -36 58 16           ~ 79 0
9 RAFGL 2591 Y*O 20 29 25.03656 +40 11 20.3316           ~ 573 0
10 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 636 2
11 IRAS 22176+6303 Y*O 22 19 17.978 +63 18 52.92           ~ 590 0
12 IRAS 23118+6110 Y*O 23 14 01.63 +61 27 20.2           ~ 349 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-06:33:30

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