{
  "abstract": "Extremely metal-poor (EMP; [Fe/H] < −3.0) stars preserve key information about the earliest stages of Galactic chemical evolution. Based on a training set of spectroscopic metallicities, we constructed catalogs of more than 120,000 EMP candidates from large-scale narrowband photometric surveys. To validate this approach, we obtained high-resolution CFHT/ESPaDOnS spectra for 13 candidates selected from the SkyMapper-based catalog. The follow-up observation confirms that the narrowband photometric selection is effective in identifying very metal-poor (VMP) stars and retaining a substantial EMP fraction: four targets are confirmed as EMP stars, and all targets remain VMP with [Fe/H] < −2.4. The photometric metallicities are systematically lower than the spectroscopic values by 0.44 dex, with a relatively small scatter of 0.19 dex, indicating a systematic offset in the photometric metallicity scale that could be reduced through improved calibration. Abundances for more than 20 chemical species are derived, leading to the identification of a new potassium-enhanced r -II star, J2001-1215. By combining chemical abundances with orbital properties, five stars are found to be dynamically consistent with known Galactic substructures, including Gaia–Sausage–Enceladus (GES), Thamnos, and Sequoia. These stars provide high-resolution chemical measurements for the EMP regime of these Galactic substructures. These results underscore the role of narrowband photometry in efficiently selecting EMP candidates for targeted high-resolution spectroscopic follow-up, thereby enabling detailed chemical and dynamical studies of the early Milky Way.",
  "abstract_shown": true,
  "affiliations": [
    "Peking University",
    "University of Chinese Academy of Science",
    "Chinese Academy of Sciences",
    "Universidad de Valparaíso",
    "Chinese Academy of Sciences South America Center for Astronomy (CASSACA)"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Huiling Chen",
      "orcid": "0009-0008-2988-2680"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Yang Huang",
      "orcid": "0000-0003-3250-2876"
    },
    {
      "affs": [
        0
      ],
      "name": "Huawei Zhang",
      "orcid": "0000-0002-7727-1699"
    },
    {
      "affs": [
        3,
        4
      ],
      "name": "Zhen Guo",
      "orcid": "0000-0003-0292-4832"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c5062m9v8d2y3.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea908",
  "fulltext_url": null,
  "id": "c5062m9v8d2y3",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea908",
  "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": "W7222926918",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea908/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/c5062m9v8d2y3.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea908",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea908"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "High-resolution Spectroscopic Follow-up Observation Results for 13 Extremely Metal-poor Candidates Selected by Narrowband Photometry",
  "title_text": "High-resolution Spectroscopic Follow-up Observation Results for 13 Extremely Metal-poor Candidates Selected by Narrowband Photometry",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/c5062m9v8d2y3",
  "venue": "The Astrophysical Journal",
  "versions": []
}