Abstract
Over the last four years the number of known pulsating DA white dwarf stars increased from 32 to a total of 147; 87 are white dwarf stars identified by the Sloan Digital Sky Survey and selected from fits of synthetic spectra from model atmospheres to the S/N<30 optical spectra. With time series photometric observations at the SOAR 4.1m telescope, we found 42 new pulsators, extending the instability strip in terms of effective temperature and surface gravity, but mainly in terms of very low amplitude pulsators. The discovery of 1.5 mma pulsators raises the necessity to re-observe all stars previously classified as non-pulsators close to or inside the instability strip, as their detection limits, in general, were above 3 mma. The real extent of the instability strip and its possible contamination with non-pulsators, specially at the borders, are still open questions.
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