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

Christophe Martayan (1, 2) , Yves Fremat (1) , Ronny Blomme (1) , Anthony Jonckheere (1) , Celine Delle-Luche (2) , Paola Sartoretti (2) , David Katz (2) , Yves Viala (2) , Michele Floquet (2) , Anne-Marie Hubert (2) , Coralie Neiner (2)

1 ROB - Royal Observatory of Belgium = Observatoire Royal de Belgique
2 GEPI - Galaxies, Etoiles, Physique, Instrumentation

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 superbubble. 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.

Mots clés: Magellanic Clouds; Galaxy: kinematics and dynamics; ISM: bubbles; stars: kinematics; methods: data analysis

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]

Christophe Martayan, Yves Fremat, Ronny Blomme, Anthony Jonckheere, Celine Delle-Luche, et al.. Radial velocities, dynamics of stars and nebulosities with GAIA and VLT-GIRAFFE. 2008. ⟨hal-00323129⟩