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In order to elucidate the nature of the brightest infrared sources associatedwith IRAS 20343+4129, IRS1 and IRS3, we observed with the Submillimeter Array(SMA) the 1.3 mm continuum and CO(2-1) emission of the region. Faint millimeterdust continuum emission was detected toward IRS1, and we derived an associatedgas mass of ~0.8 Msun. The IRS1 spectral energy distribution agrees with IRS1being an intermediate-mass Class I source of about 1000 Lsun, whosecircumstellar material is producing the observed large infrared excess. We havediscovered a high-velocity CO bipolar outflow in the east-west direction, whichis clearly associated with IRS1, and the outflow parameters are similar tothose of intermediate-mass young stellar objects. Associated with the bluelarge scale CO outflow lobe, detected with single-dish observations, we onlyfound two elongated low-velocity structures on either side of IRS3. Thelarge-scale outflow lobe is almost completely resolved out by the SMA. Ourdetected low-velocity CO structures are coincident with elongated H2 emissionfeatures. The strongest millimeter continuum condensations in the region arefound on either side of IRS3, where the infrared emission is extremely weak,and the CO and H2 elongated structures follow the border of the millimetercontinuum emission that is facing IRS3. All these results suggest that the dustis associated with the walls of an expanding cavity driven by IRS3, estimatedto be a B2 star. Within and beyond the expanding cavity, the millimetercontinuum sources can be sites of future low-mass star formation.

Unveiling the nature and interaction of the intermediate/high-mass YSOs in IRAS 20343+4129