{
  "id": "1710.05564",
  "version": "v1",
  "published": "2017-10-16T08:40:03.000Z",
  "updated": "2017-10-16T08:40:03.000Z",
  "title": "Are some CEMP-s stars the daughters of spinstars?",
  "authors": [
    "Arthur Choplin",
    "Raphael Hirschi",
    "Georges Meynet",
    "Sylvia Ekström"
  ],
  "comment": "4 pages, accepted for publication in A&A",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "CEMP-s stars are long-lived low-mass stars with a very low iron content as well as overabundances of carbon and s-elements. Their peculiar chemical pattern is often explained by pollution from a AGB star companion. Recent observations have shown that most of the CEMP-s stars are in a binary system, providing support to the AGB companion scenario. A few CEMP-s stars, however, appear to be single. We inspect four apparently single CEMP-s stars and discuss the possibility that they formed from the ejecta of a previous-generation massive star, referred to as the \"source\" star. In order to investigate this scenario, we computed low-metallicity massive star models with and without rotation and including complete s-process nucleosynthesis. We find that non-rotating source stars cannot explain the observed abundance of any of the four CEMP-s stars. Three out of the four CEMP-s stars can be explained by a $25$ $M_{\\odot}$ source star with $v_{\\rm ini} \\sim 500$ km s$^{-1}$ (spinstar). The fourth CEMP-s star has a high Pb abundance that cannot be explained by any of the models we computed. Since spinstars and AGB predict different ranges of [O/Fe] and [ls/hs], these ratios could be an interesting way to further test these two scenarios.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-10-16T08:40:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "source star",
      "complete s-process nucleosynthesis",
      "low iron content",
      "low-metallicity massive star models",
      "fourth cemp-s star"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}