{
  "abstract": "We investigate the stellar radial metallicity ([Fe/H]) gradient–age relation (MGAR) of the Galactic disc using a solar-neighbourhood sample of 580 037 FGK dwarf and turn-off stars from LAMOST DR7, Gaia DR3, and the corrected StarHorse age catalogue. The fiducial MGAR is non-monotonic, with relatively strong negative gradients at intermediate ages followed by substantial flattening towards older populations. The most negative gradient occurs at 6–8 Gyr in the adopted 2-Gyr bins, although the 4–6 Gyr slope is statistically similar, indicating a broad intermediate-age turnover rather than a sharply defined transition. The flattening persists within the low-α population, indicating that chemical-population mixing alone cannot explain the full-sample relation, and is also recovered under alternative guiding-radius definitions, radial fitting ranges, vertical-orbit selections, propagation of the reported random age uncertainties, and an alternative stellar-age scale. In contrast, controlling the age-dependent Teff–log g distribution substantially reduces the absolute gradient amplitudes and modifies the younger-age behaviour. A same-star comparison with APOGEE DR17 further shows that the broad age dependence of the controlled MGAR is recovered using an external [Fe/H] scale. We therefore identify the intermediate-to-old-age flattening as the most robust feature of the observed MGAR, whereas the precise location and depth of the intermediate-age minimum and the detailed younger-age morphology are less stable. These results indicate that stellar-parameter selection can contribute to the diversity of MGAR morphologies reported in previous studies.",
  "abstract_shown": true,
  "affiliations": [
    "Qinghai University Department of Physics and Astronomy, , Xining, 810016 ,",
    "Research Center of Astronomy, Qinghai University , Xining, 810016 ,",
    "General Education Center, Qinghai Institute of Technology , No. 2, Xining, 810016 ,",
    "Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Key Laboratory of Quantum Theory and Applications of MoE, Gansu Provincial Research Center for Basic Disciplines of Quantum Physics , Lanzhou University, Lanzhou 730000 ,",
    "School of Computer Technology and Application , Qinghai University, Xining 810016 ,",
    "Qinghai Provincial Key Laboratory of Media Integration Technology and Communication, Qinghai University , Xining 810016 ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 7,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Yi-De Jing",
      "orcid": "0009-0007-6919-2089"
    },
    {
      "affs": [
        2,
        3
      ],
      "name": "Duojie Jia"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Bin Wang"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Yulong Gao"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Liyuan Lu",
      "orcid": "0000-0002-3286-5346"
    },
    {
      "affs": [
        4,
        5
      ],
      "name": "Zheng-Jun Du"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Zenghui Zou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5hg4h5ky2dhnr.bib",
  "cited_by": 0,
  "doi": "10.1093/mnras/stag2006",
  "fulltext_url": null,
  "id": "5hg4h5ky2dhnr",
  "issns": [
    "0035-8711",
    "1365-2966"
  ],
  "landing_url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2006/8979808",
  "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": "W7223205473",
  "pdf_url": "https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stag2006/72372898/stag2006.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": "Oxford University Press (OUP)",
  "ris": "https://research.draconitic.com/paper/5hg4h5ky2dhnr.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:17Z",
      "native_id": "10.1093/mnras/stag2006",
      "source": "crossref",
      "url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2006/8979808"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Age dependence of the radial metallicity gradient in the Galactic disc with LAMOST and Gaia",
  "title_text": "Age dependence of the radial metallicity gradient in the Galactic disc with LAMOST and Gaia",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:17Z",
  "url": "https://research.draconitic.com/paper/5hg4h5ky2dhnr",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}