Abstract
Variogram analysis is applied to time series of variable stars. This method allows to characterize time- scales of varying signals. It is well suited for periodic and pseudo-periodic signals. The aspects of robustness, bin positions and bin widths for the variogram estima- tor are assessed, evaluated with the help of simulations and adapted to the Hipparcos photometry. For instance variogram methodology is successfully applied for the de- tection of spurious periods, the estimation of measurement noise and the analysis of the pseudo-period of some typical Hipparcos variable stars.
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