Massive Star Formation: The Nearby Star-Forming Region IRAS 09002-4732 and the Intrinsic Binarity Rate of Massive Stars

The formation of massive stars is an important, but poorly understood process: simple upscaling of disk accretion models
faces serious problems and other formation scenarios might be necessary to overcome the immense radiation pressure.
In addition, massive star formation is intimately linked to dense stellar clusters and cannot be properly described as an isolated process.
In this talk I will present recent results from multi-wavelength, high-resolution observations of a nearby massive star-forming region
IRAS 09002-4732, one of the brightest far-infrared sources in the sky. I explore the ultracompact HII region,
the global stellar population and discuss the properties of the most massive star(s). I will also present an ongoing effort
to measure the intrinsic multiplicity of massive stars, based on the first multi-epoch radial velocity observations
of deeply embedded O-stars in ultracompact HII regions.