{
  "id": "1001.1834",
  "version": "v1",
  "published": "2010-01-12T09:54:38.000Z",
  "updated": "2010-01-12T09:54:38.000Z",
  "title": "Beryllium abundances and the formation of the halo and the thick disk",
  "authors": [
    "R. Smiljanic",
    "L. Pasquini",
    "P. Bonifacio",
    "D. Galli",
    "B. Barbuy",
    "R. Gratton",
    "S. Randich"
  ],
  "comment": "6 pages, 5 figures, To appear in the Proceedings of IAU Symp. 268 - Light Elements in the Universe (C. Charbonnel, M. Tosi, F. Primas, C. Chiappini, eds)",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "The single stable isotope of beryllium is a pure product of cosmic-ray spallation in the ISM. Assuming that the cosmic-rays are globally transported across the Galaxy, the beryllium production should be a widespread process and its abundance should be roughly homogeneous in the early-Galaxy at a given time. Thus, it could be useful as a tracer of time. In an investigation of the use of Be as a cosmochronometer and of its evolution in the Galaxy, we found evidence that in a log(Be/H) vs. [alpha/Fe] diagram the halo stars separate into two components. One is consistent with predictions of evolutionary models while the other is chemically indistinguishable from the thick-disk stars. This is interpreted as a difference in the star formation history of the two components and suggests that the local halo is not a single uniform population where a clear age-metallicity relation can be defined. We also found evidence that the star formation rate was lower in the outer regions of the thick disk, pointing towards an inside-out formation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-01-12T09:54:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "thick disk",
      "beryllium abundances",
      "star formation history",
      "halo stars separate",
      "single uniform population"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1017/S1743921310004667"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 842616,
      "adsabs": "2010IAUS..268..483S"
    }
  }
}