Evaluating GAIA performances on eclipsing binaries

III. Orbits and stellar parameters for UW LMi, V432 Aur and CN Lyn

¹ Osservatorio Astronomico di Padova, Sede di Asiago, 36012 Asiago (VI), Italy
² Dipartimento di Astronomia dell'Università di Padova, Osservatorio Astrofisico, 36012 Asiago (VI), Italy
³ CISAS, Centro Interdipartimentale Studi ed Attività Spaziali dell'Università di Padova, Italy
⁴ Physics and Astronomy Department, University of Calgary, Calgary T2N 1N4, Canada
⁵ University of Ljubljana, Department of Physics, Jadranska 19, 1000 Ljubljana, Slovenia
⁶ Centre for Astronomy, Nicholaus Copernicus University, ul. Gagarina 11, 87-100 Torun, Poland

Corresponding author: U. Munari, munari@pd.astro.it

Received: 12 May 2003
Accepted: 26 September 2003

Abstract

The orbits and physical parameters of three detached F and G-type eclipsing binaries have been derived combining Hipparcos H_P photometry with 8480–8740 Å 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.