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Abstract  This document is divided in two parts. The first part deals with the radial velocities (RV) distributions for B‐type stars and nebulosities observed with the VLT‐GIRAFFE in the Large and Small Magellanic Clouds towards the open clusters NGC2004 and NGC330. Thanks to the resolution of GIRAFFE spectra, we found that the RV distribution for the nebulosities in the LMC is bi‐modal. This bi‐modality can be interpreted, in term of dynamics, by the expansion of the LMC4 super‐bubble. The second part deals with the GAIA space mission and the determination of the radial velocities by using Radial Velocity Spectrometer (RVS) spectra. The methods to determine the radial velocities are presented as well as preliminary results on simulated RVS spectra. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Radial velocities, dynamics of stars and nebulosities with GAIA and VLT‐GIRAFFE