Test of the Optimization Techniques for the Photometric Analysis of Contact Binaries

LAPASSET, E., GOMEZ, M., FARIÑAS, R

Córdoba - Argentina

Congreso; Evolutionary Processes in Interacting Binary Stars. Proceedings of the 151st. Symposium of the International Astronomical Union; 1991

Observatorio Astronómico de Córdoba

We present light curve analyses of contact binaries and comparisons with  previously published cross-correlation radial velocity data. The critical parameter q (mass-ratio) obtained from a grid technique is confronted with the spectroscopic value. For total eclipsing systems, both values are always in good or reasonable agreement, including some stars with shallow light curves. For partial eclipsing systems, convergent photometric and spectroscopic results are obtained for an important set of stars. Two exceptions are V523 Cas and XY Boo for which some arguments are suggested. We concluded that reliable parameters determinations can be obtained from pure photometric solutions,  by means of grid techniques.