2 Observations

The spectra used in this work were obtained with the ELODIE echelle spectrograph (see BQ96 for technical details) attached to the 1.93m telescope of the Observatoire de Haute-Provence (France) during August 1999. A high S/N (>300) spectrum of Vega was obtained covering the range of 3900-6820 Å.

The best way to check both reduction and analysis is to obtain a good quality solar spectrum with ELODIE, in the same conditions as in the case of stellar observations. The target can be either an asteroid or one of the Jovian moons in order to have a point-like, but bright enough source. Our choice was Callisto, and it was observed on 13 August 1999 when it was almost at a maximum angular distance from Jupiter, thus avoiding light pollution by the planet. The resulting spectrum has a S/N of about 220 at 5550 Å.