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We use TESS 10-minute Full Frame Images (Sectors 27-55) to study a sample of1708 stars within 500 pc of the Sun that lie in a narrow colour range in thecentre of the delta Scuti instability strip (0.29 < BP-RP < 0.31). Based on theFourier amplitude spectra, we identify 848 delta Scuti stars, as well as 47eclipsing or contact binaries. The strongest pulsation modes of some deltaScuti stars fall on the period-luminosity relation of the fundamental radialmode but many correspond to overtones that are approximately a factor of twohigher in frequency. Many of the low-luminosity delta Scuti stars show a seriesof high-frequency modes with very regular spacings. The fraction of stars inour sample that show delta Scuti pulsations is about 70% for the brighteststars (G<8), consistent with results from Kepler. However, the fraction dropsto about 45% for fainter stars and we find that a single sector of TESS dataonly detects the lowest-amplitude delta Scuti pulsations (around 50 ppm) instars down to about G=9. Finally, we have found four new high-frequency deltaScuti stars with very regular mode patterns, and have detected pulsations inlambda Mus that make it the fourth-brightest delta Scuti in the sky (G=3.63).Overall, these results confirm the power of TESS and Gaia for studyingpulsating stars.

Identifying 850 delta Scuti pulsators in a narrow Gaia colour range with TESS 10-minute full-frame images