SIMBAD references

2014MNRAS.445.1299C - Mon. Not. R. Astron. Soc., 445, 1299-1313 (2014/December-1)

Water deuterium fractionation in the high-mass star-forming region G34.26+0.15 based on Herschel/HIFI data.

COUTENS A., VASTEL C., HINCELIN U., HERBST E., LIS D.C., CHAVARRIA L., GERIN M., VAN DER TAK F.F.S., PERSSON C.M., GOLDSMITH P.F. and CAUX E.

Abstract (from CDS):

Understanding water deuterium fractionation is important for constraining the mechanisms of water formation in interstellar clouds. Observations of HDO and H_2^18O transitions were carried out towards the high-mass star-forming region G34.26+0.15 with the Heterodyne Instrument for the Far-Infrared (HIFI) instrument onboard the Herschel Space Observatory, as well as with ground-based single-dish telescopes. 10 HDO lines and three H_2^18O lines covering a broad range of upper energy levels (22-204 K) were detected. We used a non-local thermal equilibrium 1D analysis to determine the HDO/H2O ratio as a function of radius in the envelope. Models with different water abundance distributions were considered in order to reproduce the observed line profiles. The HDO/H2O ratio is found to be lower in the hot core ( ∼ 3.5x10–4-7.5x10–4) than in the colder envelope ( ∼ 1.0x10–3-2.2x10–3). This is the first time that a radial variation of the HDO/H2O ratio has been found to occur in a high-mass source. The chemical evolution of this source was modelled as a function of its radius and the observations are relatively well reproduced. The comparison between the chemical model and the observations leads to an age of ∼ 105 yr after the infrared dark cloud stage.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): astrochemistry - ISM: abundances - ISM: individual objects: G34.26+0.15 - ISM: molecules

Simbad objects: 10

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