2002PASP..114..636S

In a photometric variability survey of 131 stars with B≲14 mag, we have found four new δ Scuti stars. We were sensitive to oscillation amplitudes as low as a few millimagnitudes (mmag). The detection rate of short-period (P<0.1 days) pulsating variable stars, which may be relevant for planned large-variability surveys such as the Global Astrometric Interferometer for Astrophysics, the Panoramic Optical Imager, and even the Large-Aperture Synoptic Survey Telescope, was therefore 3%. All four new variable stars have low pulsation amplitude (tens of mmag), and one has a very short period (0.0198 days). This star is one of the fastest known δ Scuti pulsators. The short period of this variable star makes it observationally tractable, and it may therefore be a particularly good candidate for asteroseismological studies. All four new variable stars will add to the cadre of low-amplitude and relatively short period δ Scuti stars that are potentially useful for learning about the structure of stars on or near the main sequence, slightly more massive than the Sun.