{
  "id": "1411.1481",
  "version": "v1",
  "published": "2014-11-06T03:06:50.000Z",
  "updated": "2014-11-06T03:06:50.000Z",
  "title": "Solar rotation inferred from radial velocities of the sun-as-a-star during the 2012 May 21 eclipse",
  "authors": [
    "Yoichi Takeda",
    "Osamu Ohshima",
    "Eiji Kambe",
    "Hiroyuki Toda",
    "Hisashi Koyano",
    "Bun'ei Sato",
    "Yasuhisa Nakamura",
    "Norio Narita",
    "Takashi Sekii"
  ],
  "comment": "7 text pages and 11 figures, with ancillary material (electronic table) in \"anc\" directory, acceptd for publication in Publ. Astron. Soc. Japan",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "With an aim to examine how much information of solar rotation can be obtained purely spectroscopically by observing the sun-as-a-star during the 2012 May 21 eclipse at Okayama Astrophysical Observatory, we studied the variation of radial velocities (V_r), which were derived by using the iodine-cell technique based on a set of 184 high-dispersion spectra consecutively obtained over the time span of ~4 hours. The resulting V_r(t) was confirmed to show the characteristic variation (Rossiter-McLaughlin effect) caused by time-varying visibility of the solar disk. By comparing the observed V_r(t) curve with the theoretical ones, which were simulated with the latitude (psi) dependent solar rotation law omega(psi) = A + B sin^2(psi) (deg/day), we found that the relation B = -5.5 A + 77 gives the best fit, though separate determinations of A and B were not possible. Since this relationship is consistent with the real values known for the sun (A = 14.5, B = -2.8), we may state that our analysis yielded satisfactory results. This consequence may provide a prospect of getting useful information on stellar rotation of eclipsing binaries from radial-velocity studies during eclipse, if many spectra of sufficiently high time-resolution are available.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-11-06T03:06:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "radial velocities",
      "dependent solar rotation law omega",
      "sun-as-a-star",
      "analysis yielded satisfactory results"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/pasj/psu139",
      "journal": "Publications of the Astronomical Society of Japan",
      "year": 2015,
      "month": "Feb",
      "volume": 67,
      "number": 1,
      "pages": 10
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015PASJ...67...10T"
    }
  }
}