CAF\'E-BEANS: An exhaustive hunt for high-mass binaries
  CAF\'E-BEANS is an on-going survey running on the 2.2 m telescope at Calar Alto. For more than two years, CAF\'E-BEANS has been collecting high-resolution spectra of early-type stars with the aim of detecting and characterising spectroscopic binaries. The main goal of this project is a thorough characterisation of multiplicity in high-mass stars by detecting all spectroscopic and visual binaries in a large sample of Galactic O-type stars, and solving their orbits. Our final objective is eliminating all biases in the high-mass-star IMF created by undetected binaries. 
I. Negueruela, J. Ma\'iz Apell\'aniz, S. Sim\'on-D\'iaz, E. J. Alfaro,   A. Herrero, J. Alonso, R. Barb\'a, J. Lorenzo, A. M...
astro-ph.SR