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We observed the ZZ Ceti star GD 154 over a whole season at the mountainstation of Konkoly Observatory. Our long time base allowed to detect the signof rotational triplets around the independent modes. To check whether these canbe real detections we made a test on our data set. We searched forcharacteristic spacing values performing Fourier analysis of numerous peaksdetermined around five frequencies in the main pulsation region. The analysisrevealed regular peak spacings with separations around 3.7 and 2.6 microHz.These values are in accordance with the ones determined by consecutiveprewhitening of Whole Earth Telescope observations.

Investigation of Rotational Splitting in the Pulsating White Dwarf GD 154