MIDI interferometry of massive YSOs: Updates on the MPIA programme
  Information about the inner structure of young stellar objects is crucial for understanding how the central forming stars gain their mass. However, especially for observations of (usually further away) high-mass young stellar objects, conventional imaging has limitations in spatial resolution. By means of mid-infrared interferometry, we can peek deeply into the strongly extinguished central 100 AU of such objects. Here, we report on new data we obtained within our programme using MIDI at the VLTI. Shown are preliminary results on the known outflow sources AFGL 2136 IRS 1 and Mon R2 IRS 3A. In particular, we describe how quantities like differential phases give additional geometrical structure information. We demonstrate how the combined interpretation of single-telescope and interferometric data at different wavelength regimes can lead to a more complete picture of the nature of such MYSOs. 
Hendrik Linz, Roman Follert, Paul A. Boley, Roy van Boekel, Bringfried   Stecklum, Christoph Leinert, Thomas Henning
astro-ph.SR physics.optics