Illumination in binaries*
URA 1280 du CNRS, Observatoire de Strasbourg, 11 rue de l'Université, F-67000 Strasbourg, France
2 Max-Plank-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching, Germany
Send offprint request to: J.-M. Hameury
Accepted: 17 September 1996
We give a simple, but accurate method that can be used to account for illumination in compact binary systems which have a low-mass companion, even if spherically symmetric illumination of the secondary star (not necessarily on the main sequence) is not assumed. This is done by introducing a multiplicative factor Φ in the Stefan-Boltzmann surface boundary condition, which accounts for the blocking of the intrinsic secondary flux by X-ray heating of the photospheric layers. Numerical fits and tables for Φ are given for unperturbed effective temperatures in the range K and in the range .
Key words: accretion, accretion discs / stars: binaries: close / X-rays: stars / methods: numerical
© European Southern Observatory (ESO), 1997