{
  "abstract": "We present a multi-diagnostic classification of 149 new planetary nebula (PN) candidates drawn from the HASH database for which optical spectra are available. Emission-line fluxes were extracted using the automated fitting code alfa. Of the 149 candidates, 26 exhibit emission lines above a 3σ detection threshold and form the working sample. We apply layered diagnostic criteria comprising classical emission-line ratio criteria, BPT and SMB diagnostic diagrams, a symbiotic star (SySt) discriminator based on [O III] auroral-to-nebular ratios, and a group-aware supervised machine-learning classifier (CatBoost; ROC–AUC ∼0.96). Two objects are classified as PN candidates (PN G022.5+14.4 and PN G023.2+13.6) and one as a tentative PN candidate (PN G021.3−05.0), one as a possible symbiotic-star candidate (PN G025.6-05.9), nine as SNRs, three as objects with mixed HII Region/SNR characteristics, and ten as HII regions. Under a strict high-purity operating threshold ($\\hat{p}_{\\rm thr} \\approx 0.75$), the CatBoost classifier flags three high-confidence candidates. We find that the machine-learning classification is consistent with the diagnostics derived from the emission-line analysis.",
  "abstract_shown": true,
  "affiliations": [
    "Space Science and Solar Energy Research and Application Center (UZAYMER) , University of Çukurova, 01330, Adana ,",
    "Adana Organised Industrial Zones Vocational School of Technical Science , University of Çukurova, 01410, Adana ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "A Demirci",
      "orcid": "0009-0001-0652-7634"
    },
    {
      "affs": [
        0
      ],
      "name": "Y C Atilgan",
      "orcid": "0009-0001-4184-9786"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "N Aksaker",
      "orcid": "0000-0001-8721-5036"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cj1v22vzktnpa.bib",
  "cited_by": 0,
  "doi": "10.1093/mnras/stag2003",
  "fulltext_url": null,
  "id": "cj1v22vzktnpa",
  "issns": [
    "0035-8711",
    "1365-2966"
  ],
  "landing_url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2003/8965451",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7223108402",
  "pdf_url": "https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stag2003/72259402/stag2003.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": "Oxford University Press (OUP)",
  "ris": "https://research.draconitic.com/paper/cj1v22vzktnpa.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:17Z",
      "native_id": "10.1093/mnras/stag2003",
      "source": "crossref",
      "url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2003/8965451"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Classification of Galactic Planetary Nebulae Among HASH Candidates",
  "title_text": "Classification of Galactic Planetary Nebulae Among HASH Candidates",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:17Z",
  "url": "https://research.draconitic.com/paper/cj1v22vzktnpa",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}