{
  "id": "1101.1096",
  "version": "v1",
  "published": "2011-01-05T21:04:44.000Z",
  "updated": "2011-01-05T21:04:44.000Z",
  "title": "Dust production and mass loss in the Galactic globular cluster 47 Tucanae",
  "authors": [
    "Iain McDonald",
    "Martha L. Boyer",
    "Jacco Th. van Loon",
    "Albert A. Zijlstra"
  ],
  "comment": "12 pages, 5 figures, accepted ApJ",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Dust production among post-main-sequence stars is investigated in the Galactic globular cluster 47 Tucanae (NGC 104) based on infrared photometry and spectroscopy. We identify metallic iron grains as the probable dominant opacity source in these winds. Typical evolutionary timescales of AGB stars suggest the mass-loss rates we report are too high. We suggest that this is because the iron grains are small or elongated and/or that iron condenses more efficiently than at solar metallicity. Comparison to other works suggests metallic iron is observed to be more prevalent towards lower metallicities. The reasons for this are explored, but remain unclear. Meanwhile, the luminosity at which dusty mass loss begins is largely invariant with metallicity, but its presence correlates strongly with long-period variability. This suggests that the winds of low-mass stars have a significant driver that is not radiation pressure, but may be acoustic driving by pulsations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-01-05T21:04:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "galactic globular cluster",
      "dust production",
      "dusty mass loss begins",
      "probable dominant opacity source",
      "metallicity"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/730/2/71",
      "journal": "The Astrophysical Journal",
      "year": 2011,
      "month": "Apr",
      "volume": 730,
      "number": 2,
      "pages": 71
    },
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 883544,
      "adsabs": "2011ApJ...730...71M"
    }
  }
}