{
  "id": "1304.2041",
  "version": "v1",
  "published": "2013-04-07T18:55:33.000Z",
  "updated": "2013-04-07T18:55:33.000Z",
  "title": "Trigonometric Parallaxes of Massive Star Forming Regions: G012.88+0.48 and W33",
  "authors": [
    "K. Immer",
    "M. J. Reid",
    "K. M. Menten",
    "A. Brunthaler",
    "T. M. Dame"
  ],
  "comment": "9 pages, 11 figures, 2 tables; accepted for publication at A&A",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We report trigonometric parallaxes for water masers in the G012.88+0.48 region and in the massive star forming complex W33 (containing G012.68--0.18, G012.81--0.19, G012.90--0.24, G012.90--0.26), from the Bar and Spiral Structure Legacy (BeSSeL) survey using the Very Long Baseline Array. The parallax distances to all these masers are consistent with $2.40^{+0.17}_{-0.15}$ kpc, which locates the W33 complex and G012.88+0.48 in the Scutum spiral arm. Our results show that W33 is a single star forming complex at about two-thirds the kinematic distance of 3.7 kpc. The luminosity and mass of this region, based on the kinematic distance, have therefore been overestimated by more than a factor of two. The spectral types in the star cluster in W33\\,Main have to be changed by 1.5 points to later types.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-04-07T18:55:33.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "massive star forming regions",
      "kinematic distance",
      "massive star forming complex w33",
      "report trigonometric parallaxes",
      "spiral structure legacy"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201220793",
      "journal": "Astronomy and Astrophysics",
      "year": 2013,
      "month": "May",
      "volume": 553
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1227453,
      "adsabs": "2013A&A...553A.117I"
    }
  }
}