THEVENIN , F.

Detailed evolutionary models of the visual binary alpha Centauri, including pre main-sequence evolution, have been performed using the masses recently determined by Pourbaix et al. (1999). Models have been constructed using the CEFF equation of state, OPAL opacities, NACRE thermonuclear reaction rates and microscopic diffusion. A...

We report full quantum scattering calculations of inelastic cross sections and rate coefficients for Mg in collision with H atoms. Transitions until the Mg(3s3d) 3D level were considered, as well as mutual neutralization and ion-pair production. These calculations are based on new ab initio potentials and nonadiabatic couplings for the nine and...

SF2A-2005: Semaine de l'Astrophysique Francaise, eds. F. Casoli, T. Contini, J.-M. Hameury and L. Pagani, EdP-Sciences, Conference Series n/a, p. 329 (2005)

International audience

Aims. The Radial Velocity Spectrometer (RVS) on board the ESA satellite mission Gaia has no calibration device. Therefore, the radial velocity zero point needs to be calibrated with stars that are proved to be stable at a level of 300 m s−1 during the Gaia observations.Methods. We compiled a dataset of ~71 000 radial velocity measurements from...

Aims. The Radial Velocity Spectrometer (RVS) on board the ESA satellite mission Gaia has no calibration device. Therefore, the radial velocity zero point needs to be calibrated with stars that are proved to be stable at a level of 300 m s−1 during the Gaia observations.Methods. We compiled a dataset of ~71 000 radial velocity measurements from...