{
  "id": "2001.11033",
  "version": "v1",
  "published": "2020-01-29T19:00:02.000Z",
  "updated": "2020-01-29T19:00:02.000Z",
  "title": "Homogeneity in the early chemical evolution of the Sextans dwarf Spheroidal galaxy",
  "authors": [
    "R. Lucchesi",
    "C. Lardo",
    "F. Primas",
    "P. Jablonka",
    "P. North",
    "G. Battaglia",
    "E. Starkenburg",
    "V. Hill",
    "M. Irwin",
    "P. Francois",
    "M. Shetrone",
    "E. Tolstoy",
    "K. Venn"
  ],
  "comment": "Submitted to A&A, 13 pages, 10 figures",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "We present the high-resolution spectroscopic analysis of two new extremely metal-poor stars (EMPS) candidates in the dwarf spheroidal galaxy Sextans. These targets were pre-selected from medium resolution spectra centered around the Ca II triplet in the near-infrared and followed-up at higher resolution with VLT/UVES. We confirm their low metallicities with [Fe/H]=-2.95 and [Fe/H]=-3.01, placing them among the most metal-poor stars known in Sextans. The abundances of 18 elements, including C, Na, the alpha-elements, Fe-peak, and neutron capture elements, are determined. In particular, we present the first measurements of Zn in a classical dwarf at extremely low metallicity. There has been previous hints of a large scatter in the abundance ratios of the Sextans stellar population around [Fe/H] -3 when compared to other galaxies. We took the opportunity of this work to re-analyse the full sample of EMPS and find a Milky-Way -like plateau and a normal dispersion at fixed metallicity.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-01-29T19:00:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "sextans dwarf spheroidal galaxy",
      "early chemical evolution",
      "low metallicity",
      "homogeneity",
      "metal-poor stars"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}