Accretion disks in luminous young stellar objects
  An observational review is provided of the properties of accretion disks
around young stars. It concerns the primordial disks of intermediate- and
high-mass young stellar objects in embedded and optically revealed phases. The
properties were derived from spatially resolved observations and therefore
predominantly obtained with interferometric means, either in the
radio/(sub)millimeter or in the optical/infrared wavelength regions. We make
summaries and comparisons of the physical properties, kinematics, and dynamics
of these circumstellar structures and delineate trends where possible. Amongst
others, we report on a quadratic trend of mass accretion rates with mass from T
Tauri stars to the highest mass young stellar objects and on the systematic
difference in mass infall and accretion rates.
