{
  "id": "0909.0618",
  "version": "v1",
  "published": "2009-09-03T11:15:22.000Z",
  "updated": "2009-09-03T11:15:22.000Z",
  "title": "Kinematics of OB-associations and the new reduction of the Hipparcos data",
  "authors": [
    "A. M. Melnik",
    "A. K. Dambis"
  ],
  "comment": "9 pages, 4 figures, accepted for publication in MNRAS",
  "journal": "MNRAS 2009, v. 400, pp 518-523",
  "doi": "10.1111/j.1365-2966.2009.15484.x",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The proper motions of OB-associations computed using the old (Hipparcos 1997} and new (van Leeuwen 2007) reductions of the Hipparcos data are in a good agreement with each other. The Galactic rotation curve derived from an analysis of line-of-sight velocities and proper motions of OB-associations is almost flat in the 3-kpc neighborhood of the Sun. The angular rotation velocity at the solar distance is Omega_0=31 +/-1 km s-1 kpc-1. The standard deviation of the velocities of OB-associations from the rotation curve is sigma=7.2 km s-1. The distance scale for OB associations (Blaha & Humphreys 1989) should be shortened by 10-20%. The residual velocities of OB-associations calculated for the new and old reductions differ, on average, by 3.5 km s-1. The mean residual velocities of OB-associations in the stellar-gas complexes depend only slightly on the data reduction employed.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-09-03T11:15:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hipparcos data",
      "ob-associations",
      "proper motions",
      "kinematics",
      "angular rotation velocity"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Wiley-Blackwell",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2009,
      "month": "Nov",
      "volume": 400,
      "number": 1,
      "pages": 518
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 830258,
      "adsabs": "2009MNRAS.400..518M"
    }
  }
}