{
  "abstract": "We present, for the first time, a detailed high-resolution spectroscopic analysis of two VMP stars, HE 1421+0022 and HE 2150−1800. Both stars exhibit significant carbon enhancement ([C/Fe] ≥+2.0)and enhanced nitrogen abundances ([N/Fe] ~+2.17 and +1.37 respectively). The derived metallicities, [Fe/H] ~−2.79 and −2.48, respectively, place both stars firmly in the VMP regime. We determined the abundances of the light and iron-peak elements C, N, Na, Mg, Ca, Sc, Ti, Cr, Mn, and Ni, as well as the neutron-capture elements Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, and Eu. Based on their locations both stars are classified as Group I objects in the Yoon-Beers diagram of A(C) vs [Fe/H]. Applying established classification criteria for carbon-enhanced metal-poor stars, HE 1421+0022 is identified as a CEMP-r/s star and HE 2150−1800 as a CEMP-s star. Our kinematic analysis shows that HE 1421+0022 is a high-energy, prograde star associated with the outer Galactic halo, while HE 2150−1800 is a high-energy, retrograde star associated with the inner halo. The combined chemodynamical properties suggest that HE 1421+0022 may be associated with either the Sagittarius (Sgr) or Gaia-Sausage/Enceladus (GSE) accretion event, whereas HE 2150−1800 is likely associated with the I’itoi structure. These results provide further evidence that metal-poor stars in the Galactic halo preserve signatures of accretion events involving dwarf satellite galaxies, offering valuable insights into the hierarchical assembly and chemical evolution of the Galaxy.",
  "abstract_shown": true,
  "affiliations": [
    "Bhattadev University Department of Physics, , Bajali, Pathsala 781325 ,",
    "Indian Institute of Astrophysics , Koramangala, Bangalore 560034 ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Jinturaj Talukdar"
    },
    {
      "affs": [
        1
      ],
      "name": "Aruna Goswami"
    },
    {
      "affs": [
        0
      ],
      "name": "Upakul Mahanta"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2rhra246acae2.bib",
  "cited_by": 0,
  "doi": "10.1093/mnras/stag1967",
  "fulltext_url": null,
  "id": "2rhra246acae2",
  "issns": [
    "0035-8711",
    "1365-2966"
  ],
  "landing_url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag1967/8923672",
  "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": "W7222139711",
  "pdf_url": "https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stag1967/71990216/stag1967.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": "Oxford University Press (OUP)",
  "ris": "https://research.draconitic.com/paper/2rhra246acae2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:17Z",
      "native_id": "10.1093/mnras/stag1967",
      "source": "crossref",
      "url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag1967/8923672"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Chemical abundances and kinematics of two very metal-poor stars: HE 1421+0022 and HE 2150−1800,",
  "title_text": "Chemical abundances and kinematics of two very metal-poor stars: HE 1421+0022 and HE 2150−1800,",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:17Z",
  "url": "https://research.draconitic.com/paper/2rhra246acae2",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}