Mid-infrared interferometry of the massive young stellar object NGC 3603 – IRS 9A S. Vehoff, C. A. Hummel, J. D. Monnier, P. Tuthill, D. E. A. Nürnberger, R. Siebenmorgen, O. Chesneau and W. J. Duschl A&A, 520 (2010) A78 Published online: 06 October 2010 DOI: 10.1051/0004-6361/200913546