* Astronomy

Title: The Algol type eclipsing binary X Tri: BVRI modelling and O-C diagram analysis
Authors: A. Liakos, P. Zasche, P. Niarchos

CCD photometric observations of the Algol-type eclipsing binary X Tri have been obtained. The light curves are analysed with the Wilson-Devinney (WD) code and new geometric and photometric elements are derived. A new O-C analysis of the system, based on the most reliable timings of minima found in the literature, is presented and apparent period changes are discussed with respect to possible and multiple Light-Time Effect (LITE) in the system. Moreover, the results for the existence of additional bodies around the eclipsing pair, derived from the period study, are compared with those for extra luminosity, derived from the light curve analysis.

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