The VLT-FLAMES Tarantula Survey

Two main scenarios have been proposed for origin of massive runaway stars -- dynamical ejection or release from a binary at the first core collapse but their relative contribution remains debated. Using two large spectroscopic campaigns towards in 30 Doradus, we aim to provide observational constraints on properties O-type population most active star-forming region Local group. We use RV measurements star populations Doradus obtained by VLT-FLAMES Tarantula Survey and Massive Binary Monitoring identify single runaways. discuss rotational qualitatively compare observations with expectations scenarios. 23 one objects, them outside regions Doradus. find an overabundance rapid rotators (vsini > 200km/s) among population, providing explanation rapidly rotating field. Considerations projected rotation rates line-of-sight (los) velocities reveal conspicuous absence 210k/ms), fast moving (v_{los} 60km/s) runaways, suggest presence different stars: rapidly-spinning slowly runaways ones. These are detected ratio close 2:1 our sample. argue that spinning result ejections, while could ejections. Given detection biases will more strongly impact slow-moving results evolution scenario dominates current