This observational study identifies 444 δ Scuti pulsators in a bright star sample, suggesting implications for stellar evolution.
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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Mani et al. (2025) studied this question.
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