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The post-common envelope binary V471 Tauri has been an object of interest fordecades. V471 Tau shows various phenomena due to its evolutionary state andunique properties, e.g. its magnetic accretion and eclipse timing variation(ETV). Previous authors explained the ETVs by different, sometimescontradictory theories. In this paper, we present and analyse the variabilityof the eclipse timing of this star. We observed V471 Tauri over the last tenyears and covered the second cycle of its period variation. Based on ouranalysis of the presented data, we assess the possible existence of a browndwarf in this system and derive its orbital parameters. We compare the resultsof our dynamical modelling to the solution predicted by Applegate-mechanismtheories, which have been developed in recent studies. We found that theobserved ETV cannot be explained only by the presence of additional componentsto the binary.

Variability of eclipse timing:the case of V471 Tauri