{
  "id": "1208.4851",
  "version": "v1",
  "published": "2012-08-23T20:00:06.000Z",
  "updated": "2012-08-23T20:00:06.000Z",
  "title": "N-body models of globular clusters: metallicity, half-light radii and mass-to-light ratios",
  "authors": [
    "Anna C. Sippel",
    "Jarrod R. Hurley",
    "Juan P. Madrid",
    "William E. Harris"
  ],
  "comment": "14 pages, 10 figures, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "Size differences of approx. 20% between red (metal-rich) and blue (metal-poor) sub-populations of globular clusters have been observed, generating an ongoing debate as to weather these originate from projection effects or the difference in metallicity. We present direct N-body simulations of metal-rich and metal-poor stellar populations evolved to study the effects of metallicity on cluster evolution. The models start with N = 100000 stars and include primordial binaries. We also take metallicity dependent stellar evolution and an external tidal field into account. We find no significant difference for the half-mass radii of those models, indicating that the clusters are structurally similar. However, utilizing observational tools to fit half-light (or effective) radii confirms that metallicity effects related to stellar evolution combined with dynamical effects such as mass segregation produce an apparent size difference of 17% on average. The metallicity effect on the overall cluster luminosity also leads to higher mass-to-light ratios for metal-rich clusters.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-08-23T20:00:06.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "globular clusters",
      "mass-to-light ratios",
      "half-light radii",
      "n-body models",
      "metallicity effect"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2012.21969.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2012,
      "month": "Nov",
      "volume": 427,
      "number": 1,
      "pages": 167
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1181728,
      "adsabs": "2012MNRAS.427..167S"
    }
  }
}