Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201..357b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 201, Oct. 1982, p. 357-364.
Astronomy and Astrophysics
Astronomy
12
Deuterium, Lyman Spectra, Molecular Clouds, Orion Constellation, Atomic Energy Levels, Isotope Effect
Scientific paper
The 2(1,1) - 2(1,2) rotational transition of HDO has been detected towards the KL position at the center of the OMC-1 at a velocity of +5.5(+ or - 1.3)km/s, corresponding to emission from the central core. This measurement is combined with previous estimates of the H2O abundance close to KL to obtain a ratio of the concentration of HDO to that of H2O of 0.0095 + or - 0.0015. The systematic model-dependence of this ratio is examined in some detail, to show how reliably it may be used to obtain a radial gradient of HDO to H2O concentration, and hence of deuterium to hydrogen concentration, within the Galaxy.
Beckman John E.
Davis Jonathan H.
Frost Ray L.
Phillips J. P.
Watt Graeme D.
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