{
  "abstract": "The Large Magellanic Cloud (LMC) provides resolved stellar abundances and star-formation histories that can be used together to test models of dwarf-galaxy chemical evolution. We investigated if the non-monotonic APOGEE $[\\mathrm{Mg}/\\mathrm{Fe}]$-$[\\mathrm{Fe}/\\mathrm{H}]$ sequence can be explained by a hybrid history that combines a second gas-infall episode with a temporary increase in star-formation efficiency (SFE). We selected 4933 LMC red-giant-branch stars from APOGEE-2 DR17. We fitted an adaptively binned median Mg sequence with the two-zone open-box code OMEGA+. The formal fitting objective contained only the Mg sequence. The metallicity distribution function (MDF), one-dimensional abundance distributions, star-formation history (SFH), present-day mass partition, SFR, and supernova (SN) rate were retained as posterior diagnostics. The best-fitting model reproduces the Mg sequence with an RMS residual of 0.01 dex and also gives a close posterior match to O. It contains two delayed-tau infall episodes, with the second beginning at $t_2=10.39$ Gyr and with integrated mass ratio $M_2/M_1=0.159$, followed by a temporary Gaussian SFE enhancement centred at $t=11.91$ Gyr. The second infall is represented by a mixture of enriched and primordial gas. The model reproduces the timing of the late SFH enhancement and yields a present SFR within the adopted comparison range. A hybrid second-infall and SFE-enhancement history is a plausible scenario for reproducing the observed LMC Mg median sequence. Our fit explains the LMC evolution fairly well, but the remaining small MDF, mass, and SN-rate discrepancies suggest that a selection-function-aware treatment of the stellar distributions is required for a stricter comparison.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.27831",
  "author_total": 3,
  "authors": [
    {
      "name": "Erik Gasteiger"
    },
    {
      "name": "Viola Hegedűs"
    },
    {
      "name": "Szabolcs Mészáros"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/brwqf70kkxr41.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.27831",
  "fulltext_url": null,
  "id": "brwqf70kkxr41",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.27831",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7223098677",
  "pdf_url": "https://arxiv.org/pdf/2610.27831",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/brwqf70kkxr41.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.27831",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.27831"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "The chemical evolution of the LMC from APOGEE abundances: a hybrid two-infall OMEGA+ analysis",
  "title_text": "The chemical evolution of the LMC from APOGEE abundances: a hybrid two-infall OMEGA+ analysis",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/brwqf70kkxr41",
  "venue": "arXiv",
  "versions": []
}