Abstract
MWC 349 A is likely a young massive star surrounded by a disk and a strong ionized wind from the disk surface. The most spectacular features of the MWC 349 A disk are hydrogen recombination line masers and lasers at mm, sub-mm and mid-IR wavelengths. We have conducted observations of MWC 349 A with the MIDI 10μm instrument of the VLTI. The continuum visibilities show the expected characteristic signature of a dust disk. In addition, the signatures of at least a dozen emission lines have been identified in the interferometric data.
