{
  "id": "1310.2215",
  "version": "v1",
  "published": "2013-10-08T18:28:31.000Z",
  "updated": "2013-10-08T18:28:31.000Z",
  "title": "High resolution study of the abundance pattern of the heavy elements in very metal-poor field stars",
  "authors": [
    "Monique Spite",
    "François Spite"
  ],
  "comment": "9 pages",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "The abundances of heavy elements in EMP stars are not well explained by the simple view of an initial basic \"rapid\" process. In a careful and homogeneous analysis of the \"First stars\" sample (eighty per cent of the stars have a metallicity [Fe/H]=-3.1$\\pm$0.4), it has been shown that at this metallicity [Eu/Ba] is constant, and therefore the Eu-rich stars (generally called \"r-rich\") are also Ba-rich. The very large variation of [Ba/Fe] (existence of \"r-poor\" and \"r-rich\" stars) induces that the early matter was not perfectly mixed. On the other hand, the distribution of the values of [Sr/Ba] vs. [Ba/Fe] appears with well defined upper and lower envelopes. No star was found with [Sr/Ba]<-0.5 and the scatter of [Sr/Ba] increases regularly when [Ba/Fe] decreases. To explain this behavior, we suggest that an early \"additional\" process forming mainly first peak elements would affect the initial composition of the matter. For a same quantity of accreted matter, this additional Sr production would barely affect the r-rich matter (which already contains an important quantity of Sr) but would change significantly the composition of the r-poor matter. The abundances found in the CEMP-rs stars reflect the transfer of heavy elements from a defunct AGB companion. But the abundances of the heavy elements in CEMP-no stars present the same characteristics as the the abundances in the EMP stars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-10-08T18:28:31.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "heavy elements",
      "high resolution study",
      "metal-poor field stars",
      "abundance pattern",
      "emp stars"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1002/asna.201311998",
      "journal": "Astronomische Nachrichten",
      "year": 2014,
      "month": "Jan",
      "volume": 335,
      "number": 1,
      "pages": 65
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014AN....335...65S"
    }
  }
}