We present an asteroseismological analysis of four ZZ Ceti stars observed with Kepler : GD 1212 , SDSS J113655.17+040952.6 , KIC 11911480 and KIC 4552982 , based on a grid of full evolutionary models of DA white dwarf stars .
We employ a grid of carbon-oxygen core white dwarfs models , characterized by a detailed and consistent chemical inner profile for the core and the envelope .
In addition to the observed periods , we take into account other information from the observational data , as amplitudes , rotational splittings and period spacing , as well as photometry and spectroscopy .
For each star , we present an asteroseismological model that closely reproduce their observed properties .
The asteroseismological stellar mass and effective temperature of the target stars are ( 0.632 \pm 0.027 M _ { \sun } , 10737 \pm 73 K ) for GD 1212 , ( 0.745 \pm 0.007 M _ { \sun } , 11110 \pm 69 K ) for KIC 4552982 , ( 0.5480 \pm 0.01 M _ { \sun } , 12721 \pm 228 K ) for KIC1191480 and ( 0.570 \pm 0.01 M _ { \sun } , 12060 \pm 300 K ) for SDSS J113655.17+040952.6 .
In general , the asteroseismological values are in good agreement with the spectroscopy .
For KIC 11911480 and SDSS J113655.17+040952.6 we derive a similar seismological mass , but the hydrogen envelope is an order of magnitude thinner for SDSS J113655.17+040952.6 , that is part of a binary system and went through a common envelope phase .