{
  "abstract": "We have developed a photometric method that produces clean hot (intrinsically blue) populations using Gaia and 2MASS photometry alone with [a] a very small (false positives < 1%) contamination from cool (intrinsically red) luminous sources, [b] independent of extinction (limited only by S/N), and [c] with only small losses (false negatives < 10%) of real OB stars. Applying the method to Gaia DR3 data we are able to recover extinguished OB stars down to E(G_BP-G_RP) = 5, producing a catalog of ~2x10^5 candidate OB stars that reaches beyond the Scutum-Centaurus arm. This method can potentially extend the sample of known OB stars by an order of magnitude, which would yield a large leap in our knowledge of the populations of compact-object progenitors, including gravitational-wave sources.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.15264",
  "author_total": 2,
  "authors": [
    {
      "name": "J. Maíz Apellániz"
    },
    {
      "name": "M. Pantaleoni González"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8nay6t8js9ptx.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.15264",
  "fulltext_url": null,
  "id": "8nay6t8js9ptx",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.15264",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7213248510",
  "pdf_url": "https://arxiv.org/pdf/2609.15264",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8nay6t8js9ptx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.15264",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.15264"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "A new method to cleanly separate hot and cool populations using just Gaia and 2MASS photometry",
  "title_text": "A new method to cleanly separate hot and cool populations using just Gaia and 2MASS photometry",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/8nay6t8js9ptx",
  "venue": "arXiv",
  "versions": []
}