2010A&A...518L.107V


Query : 2010A&A...518L.107V

2010A&A...518L.107V - Astronomy and Astrophysics, volume 518, L107-107 (2010/7-2)

Water abundance variations around high-mass protostars: HIFI observations of the DR 21 region.

VAN DER TAK F.F.S., MARSEILLE M., HERPIN F., WYROWSKI F., BAUDRY A., BONTEMPS S., BRAINE J., DOTY S.D., FRIESWIJK W., MELNICK G., SHIPMAN R., VAN DISHOECK E.F., BENZ A.O., CASELLI P., HOGERHEIJDE M., JOHNSTONE D., LISEAU R., BACHILLER R., BENEDETTINI M., BERGIN E., BJERKELI P., BLAKE G., BRUDERER S., CERNICHARO J., CODELLA C., DANIEL F., DI GIORGIO A.M., DOMINIK C., ENCRENAZ P., FICH M., FUENTE A., GIANNINI T., GOICOECHEA J.R., DE GRAAUW T., HELMICH F., HERCZEG G., JORGENSEN J., KRISTENSEN L., LARSSON B., LIS D., McCOEY C., NEUFELD D., NISINI B., OLBERG M., PARISE B., PEARSON J., PLUME R., RISACHER C., SANTIAGO J., SARACENO P., TAFALLA M., VAN KEMPEN T., VISSER R., WAMPFLER S., YILDIZ U., RAVERA L., ROELFSEMA P., SIEBERTZ O. and TEYSSIER D.

Abstract (from CDS):

Water is a key molecule in the star formation process, but its spatial distribution in star-forming regions is not well known. We study the distribution of dust continuum and H2O and 13CO line emission in DR21, a luminous star-forming region with a powerful outflow and a compact HII region. Herschel-HIFI spectra near 1100 GHz show narrow 13CO 10-9 emission and H2O 111-000 absorption from the dense core and broad emission from the outflow in both lines. The H2O line also shows absorption by a foreground cloud known from ground-based observations of low-J CO lines. The dust continuum emission is extended over 36'' FWHM, while the 13CO and H2O lines are confined to ≃24'' or less. The foreground absorption appears to peak further North than the other components. Radiative transfer models indicate very low abundances of ∼2x10–10 for H2O and ∼8x10–7 for 13CO in the dense core, and higher H2O abundances of ∼4x10–9 in the foreground cloud and ∼7x10–7 in the outflow. The high H2O abundance in the warm outflow is probably due to the evaporation of water-rich icy grain mantles, while the H2O abundance is kept down by freeze-out in the dense core and by photodissociation in the foreground cloud.

Abstract Copyright:

Journal keyword(s): ISM: molecules - stars: formation - astrochemistry - ISM: individual objects: DR21

Simbad objects: 4

goto Full paper

goto View the references in ADS

Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 757 1
2 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 382 1
3 NAME DR 21(OH) M Rad 20 39 01 +42 29.8           ~ 87 0
4 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 1018 0

To bookmark this query, right click on this link: simbad:objects in 2010A&A...518L.107V and select 'bookmark this link' or equivalent in the popup menu


2023.01.31-01:53:48

© Université de Strasbourg/CNRS

    • Contact