Characterizing bright δ Scuti pulsators using TESS lightcurves
Abstract
We present a study of bright, young δ Scuti stars near the zero-age main sequence using TESS light curves and Gaia DR3 data. From a sample of 2041 stars with G<7 and GBP-GRP colour in the range 0-0.6, we identified 444 δ Scuti pulsators. We measured a pulsator fraction of ~70% in the middle of the instability strip, tapering off towards the edges. A period - luminosity diagram reveals a concentration along the fundamental mode and overtone ridges. We addressed sample completeness and identified low-frequency pulsators possibly exhibiting mixed modes. Cross-matching with nearby young associations showed that 63 δ Scuti stars from our sample are association members.
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