{
  "id": "1002.2492",
  "version": "v1",
  "published": "2010-02-12T08:36:22.000Z",
  "updated": "2010-02-12T08:36:22.000Z",
  "title": "SiO and H2O Maser Observations of Red Supergiants in Star Clusters Embedded in the Galactic Disk",
  "authors": [
    "S. Deguchi",
    "J. Nakashima",
    "Y. Zhang",
    "S. S. N. Chong",
    "K. Koike",
    "S. Kwok"
  ],
  "comment": "high res. figures available at http://www.nro.nao.ac.jp/~lib_pub/report/data/no674.pdf. PASJ 62, No.2 (2010, April 25 issue) in press",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "We present the result of radio observations of red supergiants in the star cluster, Stephenson's #2, and candidates for red supergiants in the star clusters, Mercer et al. (2005)'s #4, #8, and #13, in the SiO and H$_2$O maser lines.The Stephenson's #2 cluster and nearby aggregation at the South-West contain more than 15 red supergiants. We detected one at the center of Stephenson's #2 and three in the south-west aggregation in the SiO maser line, and three of these 4 were also detected in the H2O maser line. The average radial velocity of the 4 detected objects is 96 km s^{-1}, giving a kinematic distance of 5.5 kpc, which locates this cluster near the base of the Scutum-Crux spiral arm. We also detected 6 SiO emitting objects associated with the other star clusters. In addition, mapping observations in the CO J=1--0 line toward these clusters revealed that an appreciable amount of molecular gas still remains around Stephenson's #2 cluster in contrast to the prototypical red-supergiant cluster, Bica et al.'s #122. It indicates that a time scale of gas expulsion differs considerably in individual clusters.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-02-12T08:36:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "red supergiants",
      "h2o maser observations",
      "star clusters",
      "galactic disk",
      "stephensons"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/pasj/62.2.391",
      "journal": "Publications of the Astronomical Society of Japan",
      "year": 2010,
      "month": "Apr",
      "volume": 62,
      "pages": 391
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 845745,
      "adsabs": "2010PASJ...62..391D"
    }
  }
}