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The theory of massive star formation currently suffers from a scarceobservational base of massive young stellar objects to compare with. In thispaper, we present OVRO CO(1-0), 13CO(1-0), C18O(1-0), and 2.6 mm continuumimages of the infrared source IRAS 19520+2759 together with complementarysingle-dish observations of CS(1-0), obtained with the 34m antenna DSS-54 atthe Madrid Deep Space Communications Complex, as well as archive images atdifferent wavelengths. As a result from our work, IRAS 19520+2759, with acontroversial nature in the past, is firmly established as a massive youngstellar object associated with a strong and compact millimetre source anddriving a collimated outflow. In addition, a second fainter millimetre sourceis discovered about 4 arcsec to the south, which is also driving an outflow.Furthermore, the two millimetre sources are associated with C18O clumpselongated perpendicularly to the outflows, which may be related to rotatingtoroids. The masses of gas and dust of the millimetre sources are estimated tobe around 100 and 50 Msun. MM1, the dominant source at all wavelengths, with atotal luminosity of (1-2)x10^5 Lsun at 9 kpc, is however not associated with 6cm emission down to a rms noise level of 0.1 mJy. We propose that IRAS19520+2759 could be an example of the recent theoretical prediction of`bloated' or `swollen' star, i.e., a massive young stellar object whose radiushas increased due to effects of accretion at a high-mass accretion rate.

IRAS 19520+2759: a 10^5 Lsun massive young stellar object driving a collimated outflow