SOUBIRAN , C.

The Radial Velocity Spectrometer (RVS) on board of Gaia having no calibration device, the zero point of radial velocities needs to be calibrated with stars proved to be stable at the level of 300m/s during the Gaia observations. A dataset of about 71000 ground-based radial velocity measurements from five high resolution spectrographs has been...

disponible à http://www.obs.u-bordeaux1.fr/m2a/soubiran/dpac_doc.html

disponible à http://www.obs.u-bordeaux1.fr/m2a/soubiran/dpac_doc.html

The Bordeaux observatory astrometric group has performed significant efforts to produce and exploit large data base surveys. This effort has been realized to extend and densify the ICRS materialized by Tycho2 catalogue. This effort concerns the systematic re-observation of the Bordeaux Carte du Ciel zone with the Bordeaux automatic CCD meridian...

At the beginning of the Gaia mission, it will be necessary to calibrate the 3 instruments, and to have data for performance check. A particular scanning mode will be used, allowing quick multiple observations over a small number of sources. This mode and the selection of corresponding sources are described.

Gaia is an ESA cornerstone mission set to revolutionise our understanding of the Milky Way. Gaia is scheduled for launch in 2013, and is designed to map over one billion stars with three instruments to collect astrometric, photometric and spectroscopic data on stars in the Milky Way and in galaxies belonging to the Local Group, distant...

Updated stellar parameters of the Gaia FGK benchmark stars (GBS). (1 data file).

We present a proper motion catalogue of 2670974 stars, covering the declination zone +11°<=?<=+18°. Proper motions were derived from the comparison of the positional M2000 catalogue (systematic observations of the Bordeaux Carte du Ciel Zone with the meridian circle, completed in 2000) with positions derived from the reduction of 512 Carte du...

Context: .This work is part of a program of proper motion measurements in the Bordeaux Carte du Ciel zone.Aims.We present the CdC2000 catalogue issued from the reduction of the complete Bordeaux Carte du Ciel zone observed at the begining of last century with the Bordeaux astrograph.Methods.Plates have been individually reduced using the...

We present the scientific motivations for GYES: a high multiplex (of the order of several hundred), high resolution (about 20 000), spectrograph to be placed at the prime focus of the CFHT. The main purpose of such an instrument is to conduct a spectroscopic survey complementary to the Gaia mission. The final Gaia catalogue (expected around...

The Gaia satellite has already provided the astronomical community with three data releases, and the Radial Velocity Spectrometer (RVS) on board Gaia has provided the radial velocity for 33 million stars. When deriving the radial velocity from the RVS spectra, several stars are measured to have large values. To verify the credibility of these...

Stellar elemental abundances are important for understanding the fundamental properties of a star or stellar group, such as age and evolutionary history, as well as the composition of an orbiting planet. However, as abundance measurement techniques have progressed, there has been little standardization between individual methods and their...

This poster describes the current organisation of RVS data processing among the Gaia-DPAC (Data Processing & Analysis Consortium), with a particular focus on the French community's contribution.