The excitation and abundance of HDO toward W3(OH)/(H_2_O).

Details The excitation and abundance of HDO toward W3(OH)/(H_2_O). The excitation and abundance of HDO toward W3(OH)/(H_2_O).

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..657h&link_type=abstract

Astronomy and Astrophysics, v.313, p.657-663

Astronomy and Astrophysics

Astrophysics

22

Ism: Molecules, Ism: Clouds, Ism: Individual: W 3(Oh), W 3(H_2_O), Radio Lines:Ism

Scientific paper

The HDO 1_01_-0_00_ ground-state line at 464GHz has been detected toward the high-mass star-forming clumps W3(OH) and W3(H_2_O), together with the higher-lying 2_11_-2_12_ and 3_12_-2_21_ lines at 241 and 225GHz, respectively. A detailed analysis of the HDO excitation shows that the higher levels are most likely populated by intense far-infrared radiation due to warm dust. The data allow constraints on the dust temperature (T_dust_>100K), total column of dust (E(B-V)>500mag) and HDO column density. Combined with H_2_^18^O data recently obtained by Gensheimer et al., the deuteration of water is found to be lower than that of other species, [HDO]/[H_2_O]=(2-6)x10^-4^, but comparable to that found for other "hot cores".

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