2010A&A...517L...6B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST19:18:42

2010A&A...517L...6B - Astronomy and Astrophysics, volume 517, L6-6 (2010/7-1)

The NH2D/NH3 ratio toward pre-protostellar cores around the UCHII region in IRAS 20293+3952.

BUSQUET G., PALAU A., ESTALELLA R., GIRART J.M., SANCHEZ-MONGE A., VITI S., HO P.T.P. and ZHANG Q.

Abstract (from CDS):

The deuterium fractionation, Dfrac, has been proposed as an evolutionary indicator in pre-protostellar and protostellar cores of low-mass star-forming regions. We investigate Dfrac, with high angular resolution, in the cluster environment surrounding the UCHII region IRAS20293+3952.We performed high angular resolution observations with the IRAM Plateau de Bure Interferometer (PdBI) of the ortho-NH2D111-101 line at 85.926GHz and compared them with previously reported VLA NH3 data.We detected strong NH2D emission toward the pre-protostellar cores identified in NH3 and dust emission, all located in the vicinity of the UCHII region IRAS20293+3952. We found high values of Dfrac≃0.1-0.8 in all the pre-protostellar cores and low values, Dfrac<0.1, associated with young stellar objects.The high values of Dfrac in pre-protostellar cores could be indicative of evolution, although outflow interactions and UV radiation could also play a role.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: individual objects: IRAS20293+3952 - ISM: clouds - ISM: molecules

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5320 1
2 QSO B2005+40 QSO 20 07 44.9443187008 +40 29 48.601470737   18.5 19 20.3   ~ 268 1
3 [PEG2007] WCloud Cld 20 31 10.71 +40 03 30.3           ~ 10 0
4 IRAS 20293+3952 HII 20 31 11.040 +40 03 10.69           ~ 66 0
5 [PEG2007] UCHII HII 20 31 11.22 +40 03 11.0           ~ 2 0
6 [PEG2007] BIMA 2 mm 20 31 12.062 +40 03 12.22           ~ 2 0
7 [PEG2007] BIMA 1 mm 20 31 12.767 +40 03 22.65           ~ 2 0
8 2MASS J20311341+4003136 IR 20 31 13.412 +40 03 13.69           ~ 2 0
9 [PEG2007] BIMA 3 mm 20 31 13.769 +40 03 03.12           ~ 3 0
10 [PEG2007] BIMA 4 mm 20 31 14.558 +40 03 06.95           ~ 3 0
11 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 708 0
12 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2507 2
13 [BSG2004] IRAS 20293+3952 outflow C mm ~ ~           ~ 2 0
14 [BSG2004] IRAS 20293+3952 outflow B mm ~ ~           ~ 3 0
15 [BSG2004] IRAS 20293+3952 outflow D mm ~ ~           ~ 2 0
16 [BSG2004] IRAS 20293+3952 outflow A mm ~ ~           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2020.07.16-19:18:42

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