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We used MIDI, the mid-infrared interferometric instrument of the VLTI, toobserve the massive protostellar candidate IRS 9A, located at a distance ofabout 7 kpc at the periphery of the NGC 3603 star cluster. Our ongoing analysisshows that MIDI almost fully resolves the object on all observed baselines, yetbelow 9 $\mu$m we detect a steep rise of the visibility. This feature ismodelled as a combination of a compact hot component and a resolved warmenvelope which lowers the correlated flux at longer wavelengths. The extendedenvelope can already be seen in both MIDI's acquisition images and incomplementary data from aperture masking observations at the Gemini Southtelescope. Its shape is asymmetric, which could indicate a circumstellar diskinclined against the line of sight. The compact component is possibly relatedto the inner edge of this (accretion) disk. The uncorrelated mid-infraredspectrum appears featureless and could be caused by optically thick emissionwithout a significant contribution from the disk atmosphere.

VLTI/MIDI Observations of the Massive Protostellar Candidate NGC 3603 IRS 9A