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We present interferometric and single-dish mid-infrared observations of asample of massive young stellar objects (BN-type objects), using VLTI-MIDI (10micron) and Subaru-COMICS (24.5 micron). We discuss the regions S140, Mon R2,M8E-IR, and W33A. The observations probe the inner regions of the dustyenvelope at scales of 50 milli arcsecond and 0.6 arcsec (100-1000 AU),respectively. Simultaneous model fits to spectral energy distributions andspatial data are achieved using self-consistent spherical envelope modelling.We conclude that those MYSO envelopes that are best described by a sphericalgeometry, the commensurate density distribution is a powerlaw with index -1.0.Such a powerlaw is predicted if the envelope is supported by turbulence on the100-1000AU scales probed with MIDI and COMICS, but the role of rotation atthese spatial scales need testing.

Young massive stars and their environment in the mid-infrared at high angular resolution