{
  "abstract": "We present an asteroseismic survey of 1,526,218 A- and F-type stars in and around the $δ$ Scuti instability strip using TESS 10-minute cadence data, which resolve the full $δ$ Scuti pulsation spectra across nearly the entire sky. We derive homogeneous stellar parameters from Gaia DR3 parallaxes and archival photometry, with temperatures that agree with interferometry to within ~300 K. A Positive--Unlabelled classifier identifies 156,706 $δ$ Scuti pulsators, which on average rotate significantly faster than non-variable A-type stars. Within the instability strip in the $T_{eff}$--$\\log L$ plane, the pulsator fraction peaks at 30% over the full sample and rises to 80% in the brightest magnitude bins. Detection sensitivity therefore accounts for much, but not all, of the apparent impurity of the strip. Our period--luminosity relation agrees with previous determinations, and we recast it as a scale-invariant period--density relation that connects directly to the pulsation constant. We find that the secondary ridge in these relations is probably a combination of several overtone modes. The $δ$ Scuti stars closest to the fundamental ridge have systematically lower rotational velocities and occupy a distinct region of the instability strip. Finally, a cross-match with a Gaia catalog of open clusters reveals a correlation between the mean pulsation frequency of $δ$ Scuti stars and cluster age, suggesting a new ensemble asteroseismic age indicator for young stellar populations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.40656",
  "author_total": 11,
  "authors": [
    {
      "name": "Daniel Hey"
    },
    {
      "name": "Simon Murphy"
    },
    {
      "name": "Timothy R. Bedding"
    },
    {
      "name": "Anuj Gautam"
    },
    {
      "name": "Daniel Huber"
    },
    {
      "name": "Yaguang Li"
    },
    {
      "name": "Ian Berry"
    },
    {
      "name": "Hyde Kenney"
    },
    {
      "name": "Prasad Mani"
    },
    {
      "name": "Tom Love"
    },
    {
      "name": "Mykyta Kliapets"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8n447dwhqv0hm.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.40656",
  "fulltext_url": null,
  "id": "8n447dwhqv0hm",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.40656",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.40656",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8n447dwhqv0hm.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:28Z",
      "native_id": "2610.40656",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.40656"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "The $δ$ Scuti instability strip and period-luminosity relation as seen by TESS and Gaia DR3",
  "title_text": "The δ Scuti instability strip and period-luminosity relation as seen by TESS and Gaia DR3",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:47Z",
  "url": "https://research.draconitic.com/paper/8n447dwhqv0hm",
  "venue": "arXiv",
  "versions": []
}