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The Light-Time Effect (LTE) is observed whenever the distance between theobserver and any kind of periodic event changes in time. The usual cause ofthis distance change is the reflex motion about the system's barycenter due tothe gravitational influence of one or more additional bodies. We analyze 5032eclipsing contact (EC) and detached (ED) binaries from the All Sky AutomatedSurvey (ASAS) catalogue to detect variations in the times of eclipses whichpossible can be due to the LTE effect. To this end we use an approach knownfrom the radio pulsar timing where a template radio pulse of a pulsar is usedas a reference to measure the times of arrivals of the collected pulses. In ouranalysis as a template for a photometric time series from ASAS, we use abest-fitting trigonometric series representing the light curve of a given EC orED. Subsequently, an O-C diagram is built by comparing the template light curvewith light curves obtained from subsets of a given time series. Most of thevariations we detected in O-Cs correspond to a linear period change. Three showevidence of more than one complete LTE-orbit. For these objects we obtainedpreliminary orbital solutions. Our results demonstrate that the timing analysisemployed in radio pulsar timing can be effectively used to study large datasets from photometric surveys.

Radio Pulsar Style Timing of Eclipsing Binary Stars from the ASAS Catalogue