Evaluating GAIA performances on eclipsing binaries. II. Orbits and stellar parameters for V781 Tau, UV Leo and GK Dra

TL;DR

This study assesses GAIA-like observations to accurately determine orbits and stellar parameters of G0 eclipsing binaries, demonstrating 1-2% precision despite system complexities.

Contribution

It introduces a method to derive stellar parameters with high accuracy from GAIA-like data for complex eclipsing binaries.

Findings

Masses, radii, and temperatures can be measured with 1-2% accuracy.

Complex binary systems with peculiarities are effectively analyzed.

GAIA-like observations are sufficient for detailed stellar characterization.

Abstract

The orbits and physical parameters of three close, double-lined G0 eclipsing binaries have been derived combining H_P, V_T, B_T photometry from the Hipparcos/Tycho mission with 8480-8740 \AA ground-based spectroscopy. The setup is mimicking the photometric and spectroscopic observations that should be obtained by GAIA. The binaries considered here are all of G0 spectral type, but each with its own complications: V781 Tau is an overcontact system with components of unequal temperature, UV Leo shows occasional surface spots and GK Dra contains a delta-Scuti variable. Such peculiarities will be common among binaries to be discovered by GAIA. We find that the values of masses, radii and temperatures for such stars can be derived with a 1-2% accuracy using the adopted GAIA-like observing mode.