{
  "id": "1111.3985",
  "version": "v1",
  "published": "2011-11-16T22:24:35.000Z",
  "updated": "2011-11-16T22:24:35.000Z",
  "title": "The r-Process in Metal Poor Stars and Black Hole Formation",
  "authors": [
    "Richard Boyd",
    "Michael Famiano",
    "Bradley Meyer",
    "Yuko Motizuki",
    "Toshitaka Kajino",
    "Ian Roederer"
  ],
  "categories": [
    "astro-ph.SR",
    "nucl-th"
  ],
  "abstract": "Nucleosynthesis of heavy nuclei in metal-poor stars is generally thought to occur via the r-process because the r-process is a primary process that would have operated early in the Galaxy's history. This idea is strongly supported by the fact that the abundance pattern in many metal-poor stars matches well the inferred Solar r-process abundance pattern in the mass range between the second and third r-process abundance peaks. Nevertheless, a significant number of metal-poor stars do not share this standard r-process template. In this Letter we suggest that the nuclides observed in many of these stars are produced by the r-process, but that it is prevented from running to completion in more massive stars by collapse to black holes before the r-process is completed, creating a \"truncated r-process,\" or \"tr-process.\" We find that the observed fraction of tr-process stars is qualitatively what one would expect from the initial mass function, and that an apparent sharp truncation observed at around mass 160 could result from a combination of collapses to black holes and the difficulty of observing the higher mass rare earths. We test the tr-process hypothesis with r-process calculations that are terminated before all r-process trajectories have been ejected. We find qualitative agreement between observation and theory when black hole collapse and observational realities are taken into account.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-11-16T22:24:35.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "black hole formation",
      "metal poor stars",
      "metal-poor stars",
      "solar r-process abundance pattern",
      "third r-process abundance peaks"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/2041-8205/744/1/L14",
      "journal": "The Astrophysical Journal",
      "year": 2012,
      "month": "Jan",
      "volume": 744,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 946424,
      "adsabs": "2012ApJ...744L..14B"
    }
  }
}