Title:VLTI + MIDI study of the high mass protostellar candidate NGC 3603 IRS 9A 


Abstract: 
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The formation and early evolution of high mass stars is among the hottest topics in astrophysics. 
Interferometric studies of these young stars and their circumstellar environments (envelopes, disks 
and jets) at near and mid infrared wavelengths are still rare and in terms of data 
analysis/interpretation very challenging. 
In this presentation I will report on observations of the high mass protostellar candidate NGC 3603 
IRS 9A which we undertook with VLTI + MIDI in 2005, complemented by near and mid infrared imaging 
and spectroscopic data. I will discuss our results obtained from dedicated modeling efforts, 
employing both DUSTY and MC3D radiative transfer codes for a selected number of source geometries / 
surface brightness distributions. 

Authors: 
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Dieter E.A. Nuernberger, Stefan Vehoff, Christian A. Hummel, Wolfgang J. Duschl