Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..459c&link_type=abstract
SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
The ESA GAIA mission (launch expected end 2011) will measure positions, proper motions, parallaxes and very low resolution spectra for about 10^9 objects, and produce radial velocities and spectra for about 10^8 objects using the Radial Velocity Spectrometer (RVS). Although Gaia is usually labelled as a self-calibrating instrument, some external calibrations are mandatory, especially for radial velocities and photometry. A coordinated plan of ground-based observations is being organised in support of Gaia to obtain the necessary auxiliary data. In particular, the calibration of the wavelength scale and zero-point of the radial velocities will rely on asteroids and on a set of about one thousand reference stars. Such stars must be selected from larger existing lists with drastic criteria and qualified as radial velocity standards from ground based observations. This poster describes the selection of stars, the observing programme on various telescopes and the first results obtained with the ELODIE and SOPHIE spectrographs.
Crifo Francoise
Guerrier A.
Hestroffer Daniel
Jasniewicz Gerard
Katz Daniel
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