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An increasing number of white dwarf stars show atmospheric chemicalcomposition polluted by heavy elements accreted from debris disk material. Theexistence of such debris disks strongly suggests the presence of one or moreplanet(s) whose gravitational interaction with rocky planetesimals isresponsible for their disruption by tidal effect. The ZZ Ceti pulsator andpolluted DAZ white dwarf GD 133 is a good candidate for searching for such apotential planet. We started in 2011 a photometric follow-up of its pulsations.As a result of this work in progress, we used the data gathered from 2011 to2015 to make an asteroseismological analysis of GD 133, providing the starparameters from a best fit model with $M$/$M_{\odot}$ = 0.630 $\pm$ 0.002,$T_{\rm eff}$ = 12400 K $\pm$ 70 K, log($M_{\rm He}/M$) = -2.00 $\pm$ 0.02,log($M_{\rm H}/M$) = -4.50 $\pm$ 0.02 and determining a rotation period of$\approx$ 7 days.

Precise determination of stellar parameters of the ZZ Ceti and DAZ white dwarf GD 133 through asteroseismology