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The deuterium fractionation, Dfrac, has been proposed as an evolutionaryindicator in pre-protostellar and protostellar cores of low-mass star-formingregions. We investigate Dfrac, with high angular resolution, in the clusterenvironment surrounding the UCHII region IRAS 20293+3952. We performed highangular resolution observations with the IRAM Plateau de Bure Interferometer(PdBI) of the ortho-NH2D 1_{11}-1_{01} line at 85.926 GHz and compared themwith previously reported VLA NH3 data. We detected strong NH2D emission towardthe pre-protostellar cores identified in NH3 and dust emission, all located inthe vicinity of the UCHII region IRAS 20293+3952. We found high values ofDfrac~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 inpre-protostellar cores could be indicative of evolution, although outflowinteractions and UV radiation could also play a role.

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