Title:AMBER and MIDI observations of massive young stellar objects

Abstract:
We present AMBER and MIDI observations of a small sample of massive young stellar objects (MYSOs). 
MYSOs are extremely red objects due to a  massive dusty envelope and have equivalent luminosities 
of B0 or earlier stars,  although lacking prominent HII regions.  These properties indicate an 
early phase of massive star formation, possibly one in which the central object is still undergoing 
mass accretion. We interpret the new AMBER and MIDI observations in terms of  2D axisymmetric 
radiative transfer model (Whitney et al. 2003), discussing the differences between high and 
low-mass star formation.