EDP Sciences
Free access
Volume 413, Number 2, January II 2004
Page(s) 635 - 642
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20031544

A&A 413, 635-642 (2004)
DOI: 10.1051/0004-6361:20031544

Evaluating GAIA performances on eclipsing binaries

III. Orbits and stellar parameters for UW LMi, V432 Aur and CN Lyn
P. M. Marrese1, 2, U. Munari1, 3, A. Siviero2, E. F. Milone4, T. Zwitter5, T. Tomov6, F. Boschi1 and C. Boeche1

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

(Received 12 May 2003 / Accepted 26 September 2003 )

The orbits and physical parameters of three detached F and G-type eclipsing binaries have been derived combining Hipparcos  $H_{\rm P}$ photometry with 8480-8740 Å ground-based spectroscopy, simulating the photometric + spectroscopic observations that the GAIA mission will obtain. Tycho  $B_{\rm T}$ and  $V_{\rm T}$ 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.

Key words: surveys: GAIA -- stars: fundamental parameters -- binaries: eclipsing -- binaries: spectroscopic

Offprint request: U. Munari, munari@pd.astro.it

SIMBAD Objects in preparation

© ESO 2004