{
  "abstract": "We perform a homogeneous analysis of 82 heavy-element-enhanced metal-poor stars from the\\\\ LAMOST/Subaru sample, including 64 $r$-process-enhanced stars, 2 limited-$r$ stars, and 16 stars exhibiting significant or moderate carbon enhancement (comprising 9 $s$-process-enhanced, 2 $r$-process-enhanced, 2 $r$/$s$, and 3 $r$+$s$ stars). Systematic differences in $\\mathrm{[X/Eu]}$ between $r$-I and $r$-II stars, together with their distinct dynamical properties, suggest that $r$-II stars likely formed in low-mass dwarf galaxies where contamination from additional nucleosynthetic channels was minimal. We have also discovered a number of peculiar objects. We identify an extremely metal-poor $r$-II star, J1158+0734 ($\\mathrm{[Fe/H]}$ = -2.93), whose enhanced Zn abundance ($\\mathrm{[Zn/Fe]}$ = +0.67) is best explained by yields from a high-energy, massive core-collapse supernova. The surface abundances of $s$-process-enhanced stars exhibit pronounced dispersion, consistent with enrichment from AGB progenitors with diverse properties. Notably, one star, J2256+0215, reveals compelling evidence for additional evolutionary mixing, as indicated by its unusually low carbon abundance ($\\mathrm{[C/Fe]}$ = +0.08) and extremely low $^{12}$C/$^{13}$C ratio of 2.33. Additionally, we identify 3 $r$+$s$ stars whose abundance patterns reveal combined contributions from both the $r$- and $s$-processes. We further propose a modified diagnostic scheme for the identification of CEMP-$r$+$s$ stars, defined as: -0.2 $\\leqslant$ $\\mathrm{[La/Nd]}$ $\\leqslant$ 0.2 and -0.5 $\\leqslant$ $\\mathrm{[Eu/Nd]}$ $\\leqslant$ 0.0.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Astrophys. J. 1003 (2026) 75",
  "arxiv": "2610.40014",
  "author_total": 10,
  "authors": [
    {
      "name": "Yangming Lin"
    },
    {
      "name": "Haining Li"
    },
    {
      "name": "Wako Aoki"
    },
    {
      "name": "Ruizheng Jiang"
    },
    {
      "name": "Tadafumi Matsuno"
    },
    {
      "name": "Zhenyu He"
    },
    {
      "name": "Ruizhi Zhang"
    },
    {
      "name": "Zhuohan Li"
    },
    {
      "name": "Satoshi Honda"
    },
    {
      "name": "Gang Zhao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/27rqc35vz1qfg.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.40014",
  "fulltext_url": null,
  "id": "27rqc35vz1qfg",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.40014",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.40014",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/27rqc35vz1qfg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.40014",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.40014"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. IV. Heavy Element Enhanced Stars",
  "title_text": "Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. IV. Heavy Element Enhanced Stars",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:45Z",
  "url": "https://research.draconitic.com/paper/27rqc35vz1qfg",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3847/1538-4357/ae5a3d",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}