Evaluating GAIA performances on eclipsing binaries

I. Orbits and stellar parameters for V505 Persei, V570 Persei and OO Pegasi

¹ Osservatorio Astronomico di Padova, Sede di Asiago, 36012 Asiago (VI), Italy
² CISAS, Centro Interdipartimentale Studi ed Attività Spaziali dell'Università di Padova, Italy
³ Centre for Astronomy, Nicholaus Copernicus University, ul. Gagarina 11, 87-100 Torun, Poland
⁴ University of Ljubljana, Department of Physics, Jadranska 19, 1000 Ljubljana, Slovenia
⁵ Physics and Astronomy Department, University of Calgary, Calgary T2N 1N4, Canada
⁶ BASF-AG, ZDP/C-C13, D-67056 Ludwigshafen, Germany
⁷ Astronomy Department, University of Florida, Gainesville, FL 32611, USA
⁸ Dipartimento di Fisica dell'Università di Milano, via Celoria 20, 20131 Milano, Italy
⁹ Dipartimento di Astronomia dell'Università di Padova, Osservatorio Astrofisico, 36012 Asiago (VI), Italy

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

Received: 13 April 2001
Accepted: 28 August 2001

Abstract

The orbits and physical parameters of three detached, double-lined A-F eclipsing binaries have been derived combining photometry from the Hipparcos/Tycho mission with 8500-8750 Å ground-based spectroscopy, mimicking the photometric+spectroscopic observations that should be obtained by GAIA, the approved Cornerstone 6 mission by ESA. This study has two main objectives, namely (a) to derive reasonable orbits for a number of new eclipsing binaries and (b) to evaluate the expected performances by GAIA on eclipsing binaries and the accuracy achievable on the determination of fundamental stellar parameters like masses and radii. It is shown that a 1% precision in the basic stellar parameters can be achieved by GAIA on well observed detached eclipsing binaries provided that the spectroscopic observations are performed at high enough resolution. Other types of eclipsing binaries (including semi-detached and contact types) and different spectral types will be investigated in subseguent papers in this series.