An observational review is provided of the properties of accretion disksaround young stars. It concerns the primordial disks of intermediate- andhigh-mass young stellar objects in embedded and optically revealed phases. Theproperties were derived from spatially resolved observations and thereforepredominantly obtained with interferometric means, either in theradio/(sub)millimeter or in the optical/infrared wavelength regions. We makesummaries and comparisons of the physical properties, kinematics, and dynamicsof these circumstellar structures and delineate trends where possible. Amongstothers, we report on a quadratic trend of mass accretion rates with mass from TTauri stars to the highest mass young stellar objects and on the systematicdifference in mass infall and accretion rates.
展开▼
