2004A&A...413..635M

The orbits and physical parameters of three detached F and G-type eclipsing binaries have been derived combining Hipparcos H_P photometry with 8480-8740Å ground-based spectroscopy, simulating the photometric + spectroscopic observations that the GAIA mission will obtain. Tycho B_T and V_T light curves are too noisy to be modeled for the three targets, and only mean Tycho colors are retained to constrain the temperature. No previous combined photometric+spectroscopic solution exists in the literature for any of the three targets. Quite remarkably, CN Lyn turned out to be an equal-masses F5 triple system. Distances from the orbital solutions agree within the astrometric error with the Hipparcos parallaxes.