Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..485g&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
1
Scientific paper
The Radial Velocity Spectrometer (RVS) of Gaia will collect spectra for about 100-200 million stars up to magnitude V ˜ 17 over the wavelength range 847 to 874 nm with a resolving power R = {λ}/{Δλ}=11 500. Each RVS target will be observed 40 times on average with an extremely stable device, both optically and mechanically. The RVS has no calibration device (such as lamps or absorption cells). It cannot be calibrated with the classical approach based on dedicated calibration exposures. The so-called Spectroscopic Global Iterative Solution (SGIS) provides an efficient alternative to calibrate the RVS instrument. The principle of SGIS is to use a set of well-behaved stars (bright, stable and of a well-suited spectral type) to iteratively derive the radial velocity of the stars and the wavelength scale of the RVS instrument. A prototype of SGIS has been developed in order to study and validate the convergence of the method.
Crifo Francoise
Guerrier A.
Katz Daniel
Turon Catherine
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