{
  "id": "astro-ph/0512317",
  "version": "v1",
  "published": "2005-12-13T00:46:41.000Z",
  "updated": "2005-12-13T00:46:41.000Z",
  "title": "Beryllium in Disk and Halo Stars -- Evidence for a Beryllium Dispersion in Old Stars",
  "authors": [
    "Ann Merchant Boesgaard",
    "Megan C. Novicki"
  ],
  "comment": "Accepted for Ap.J. 25 pages, including 7 figures and 3 tables",
  "journal": "Astrophys.J.641:1122-1130,2006",
  "doi": "10.1086/500501",
  "categories": [
    "astro-ph"
  ],
  "abstract": "The study of Be in stars of differing metal content can elucidate the formation mechanisms and the Galactic chemical evolution of Be. We have obtained high-resolution, high signal-to-noise spectra of the resonance lines of Be II in eight stars with the high-dispersion spectrograph (HDS) on the Subaru 8.2 m telescope on Mauna Kea. Abundances of Be have been determined through spectrum synthesis. The stars with [Fe/H] values > -1.1 conform to the published general trend of Be vs Fe. We have confirmed the high Be abundance in HD 94028 and have found a similarly high Be abundance in another star, HD 132475, at the same metallicity: [Fe/H] = -1.5. These two stars are 0.5 - 0.6 dex higher in Be than the Be-Fe trend. While that general trend contains the evidence for a Galaxy-wide enrichment in Be and Fe, the higher Be abundances in those two stars indicates local Be enrichments. Possible enrichment mechanisms include hypernovae and multiple supernova explosions contained in a superbubble. The star G 64-37 has [Fe/] = -3.2; we have determined its Be abundance to look for evidence of a Be plateau. It's Be abundance appears to extend the Be-Fe trend to lower Fe abundances without any evidence for a plateau as had been indicated by a high Be abundance in another very metal-poor star, G 64-12. Although these two stars have similar Be abundances within the errors, it could be that their different Be values may be indicating that a Be dispersion exists even at the lowest metallicities.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2005-12-13T00:46:41.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "halo stars",
      "beryllium dispersion",
      "old stars",
      "be-fe trend",
      "general trend contains"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 25,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 700275
    }
  }
}