{
  "id": "1004.4957",
  "version": "v1",
  "published": "2010-04-28T06:19:54.000Z",
  "updated": "2010-04-28T06:19:54.000Z",
  "title": "On the Binding Energy Parameter $λ$ of Common Envelope Evolution",
  "authors": [
    "Xiao-Jie Xu",
    "Xiang-Dong Li"
  ],
  "comment": "23 pages, 3 figures, accepted for publication in ApJ.",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "The binding energy parameter $\\lambda$ plays an important role in common envelope (CE) evolution. Previous works have already pointed out that $\\lambda$ varies throughout the stellar evolution, though it has been adopted as a constant in most of the population synthesis calculations. We have systematically calculated the binding energy parameter $\\lambda$ for both Population I and Population II stars of masses $1-20 M_{\\sun}$, taking into account the contribution from the internal energy of stellar matter. We present fitting formulae for $\\lambda$ that can be incorporated into future population synthesis investigations. We also briefly discuss the possible applications of the results in binary evolutions.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-04-28T06:19:54.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "binding energy parameter",
      "common envelope evolution",
      "population synthesis calculations",
      "population synthesis investigations",
      "internal energy"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/722/2/1985",
      "journal": "The Astrophysical Journal",
      "year": 2010,
      "month": "Jun",
      "volume": 716,
      "number": 1,
      "pages": 114
    },
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 853305,
      "adsabs": "2010ApJ...716..114X"
    }
  }
}