1997A&A...325..725C

We have used the Pico Veleta 30-m telescope and the Plateau de Bure interferometer to obtain maps of the molecular gas associated with IRAS 20126+4104 in 11 rotational transitions. We also present near infrared images of the same region taken with the TIRGO and NOT telescopes. A molecular clump centred on the H₂O masers associated with the IRAS source is found. A molecular bipolar outflow is clearly evidenced by the interferometer maps in the HCO⁺(1-0) line, originating at the center of the clump; also, the images in the K-band continuum and in the H₂ v=1->0 S(1) vibrational line trace the same bipolar structure seen in HCO⁺. A flattened structure elongated in the direction perpendicular to the outflow axis is seen in the CH₃CN(5-4) line: we interpret this as a rotating disk with a very young massive early type star at its centre. We conclude that IRAS 20126+4104 represents a beautiful example of a disk-outflow system associated with an early type (proto)star, prior to the development of an ultracompact HII region.