C. Jordi, F. Figueras, J.M. Carrasco
GAIA will measure all detected sources with a broad-band photometer (BBP) implemented by 4 or 5 bands in the focal plane of the astrometric telescopes (Astro-1 and Astro-2). The sources down to V=20 will also be detected and measured with a medium-band photometer (MBP) implemented by 10-12 bands in the focal plane of the smaller telescope (Spectro). The aim of this paper is to review the current design of the instruments and the estimated attainable accuracies of the stellar parameters for some galactic populations.
Manuscript: jad9_8b.ps