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Photoelectric photometry of the unusual eclipsing binary system FF Aquarii.
FF Aqr is the first eclipsing binary (P = 9.2d) containing a hotsubdwarf (sdOB) and a chromospherically active cool giant componentclassified as a G8-K0 III star. We observed the system in U, B, V and Rfilters during 2002, 2003 and 2004 observing seasons using two differenttelescopes and detectors. We obtained a total of 1171 observationalpoints in each colour. The light curve reveals that FF Aqr has atotality in the primary eclipse, which lasts about 13h 02m. The shape ofthe light curve indicates that FF Aqr is an Algol type binary. The lightcurves display an asymmetrical wave-like distortion at outside of theeclipse which has a minimum at about 0.46P and a light amplitude of0.050m, 0.204m, 0.277m, 0.282m in the U, B, V, and R bands,respectively. This variation can not be explained by the reflectioneffect alone. We used the Wilson-Devinney code for the geometric andphysical parameters of the system. The asymmetry at outside of theeclipse light variation and the results obtained from the light curveanalysis were discussed.
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