{
  "id": "2305.12326",
  "version": "v1",
  "published": "2023-05-21T03:11:13.000Z",
  "updated": "2023-05-21T03:11:13.000Z",
  "title": "Chemodynamical Properties and Ages of Metal-Poor Stars in S-PLUS",
  "authors": [
    "Felipe Almeida-Fernandes",
    "Vinicius Placco",
    "Helio Rocha-Pinto",
    "Marcelo Borges Fernandes",
    "Guilherme Limberg",
    "Leandro Beraldo e Silva",
    "João A. S. Amarante",
    "Hélio Perottoni",
    "Roderik Overzier",
    "William Schoenell",
    "Tiago Ribeiro",
    "Antonio Kanaan",
    "Claudia Mendes de Oliveira"
  ],
  "comment": "18 pages, 13 figures. To be published in MNRAS main journal (accepted 15-may-2023)",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "Metal-poor stars are key to our understanding of the early stages of chemical evolution in the Universe. New multi-filter surveys, such as the Southern Photometric Local Universe Survey (S-PLUS), are greatly advancing our ability to select low-metallicity stars. In this work, we analyse the chemodynamical properties and ages of 522 metal-poor candidates selected from the S-PLUS data release 3. About 92% of these stars were confirmed to be metal-poor ([Fe/H] $\\leq -1$) based on previous medium-resolution spectroscopy. We calculated the dynamical properties of a subsample containing 241 stars, using the astrometry from Gaia Data Release 3. Stellar ages are estimated by a Bayesian isochronal method formalized in this work. We analyse the metallicity distribution of these metal-poor candidates separated into different subgroups of total velocity, dynamical properties, and ages. Our results are used to propose further restrictions to optimize the selection of metal-poor candidates in S-PLUS. The proposed astrometric selection ($\\mathrm{parallax}>0.85$ mas) is the one that returns the highest fraction of extremely metal-poor stars (16.3% have [Fe/H] $\\leq -3$); the combined selection provides the highest fraction of very metal-poor stars (91.0% have [Fe/H] $\\leq -2$), whereas the dynamical selection (eccentricity > 0.35 and diskness < 0.75) is better for targetting metal-poor (99.5% have [Fe/H] $\\leq -1$). Using only S-PLUS photometric selections, it is possible to achieve selection fractions of 15.6%, 88.5% and 98.3% for metallicities below $-$3, $-$2 and $-$1, respectively. We also show that it is possible to use S-PLUS to target metal-poor stars in halo substructures such as Gaia-Sausage/Enceladus, Sequoia, Thamnos and the Helmi stream.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-05-21T03:11:13.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "metal-poor stars",
      "chemodynamical properties",
      "metal-poor candidates",
      "southern photometric local universe survey",
      "highest fraction"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}