Evaluating GAIA performances on eclipsing binaries. I. Orbits and stellar parameters for V505 Per, V570 Per and OO Peg

TL;DR

This paper assesses GAIA's ability to determine stellar parameters of eclipsing binaries by analyzing combined photometric and spectroscopic data, demonstrating that high-precision measurements are achievable with proper observations.

Contribution

It provides a methodology to evaluate GAIA's performance on eclipsing binaries and estimates the achievable accuracy in fundamental stellar parameters.

Findings

GAIA can achieve 1% precision in stellar parameters with high-resolution spectroscopy.

Combining Hipparcos/Tycho photometry with ground-based spectroscopy effectively simulates GAIA observations.

The study sets a foundation for future analysis of various eclipsing binary types.

Abstract

The orbits and physical parameters of three detached, double-lined A-F eclipsing binaries have been derived combining H_P, V_T, B_T photometry from the Hipparcos/Tycho mission with 8500-8750 Ang 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 following papers along this series.