We report on the discovery of six new ZZ Ceti stars . They were selected as candidates based on preparatory photometric observations of objects from the Hamburg Quasar Survey ( HQS ) , and based on the spectra of the Supernova Ia Progenitor Survey ( SPY ) . Time-series photometry of 19 candidate stars was carried out at the Nordic Optical Telescope ( NOT ) at Roque de Los Muchachos Observatory , Spain . The new variables are relatively bright , 15.4 < B < 16.6 . Among them is WD 1150-153 , which is the third ZZ Ceti star that shows photospheric CaII in its spectrum .