{
  "id": "1107.1786",
  "version": "v1",
  "published": "2011-07-09T14:20:44.000Z",
  "updated": "2011-07-09T14:20:44.000Z",
  "title": "The Search for Super-saturation in Chromospheric Emission",
  "authors": [
    "Damian J. Christian",
    "Mihalis Mathioudakis",
    "Tersi Arias",
    "Moira Jardine",
    "David B. Jess"
  ],
  "comment": "28 Pages, 6 figures, 1 Table; Accepted in ApJ for Aug 2011",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We investigate if the super-saturation phenomenon observed at X-ray wavelengths for the corona, exists in the chromosphere for rapidly rotating late-type stars. Moderate resolution optical spectra of fast rotating EUV- and X-ray- selected late-type stars were obtained. Stars in alpha Per were observed in the northern hemisphere with the Isaac Newton 2.5 m telescope and IDS spectrograph. Selected objects from IC 2391 and IC 2602 were observe in the southern hemisphere with the Blanco 4m telescope and R-C spectrograph at CTIO. Ca II H & K fluxes were measured for all stars in our sample. We find the saturation level for Ca II K at log(L_CaK/L_bol) = -4.08. The Ca II K flux does not show a decrease as a function of increased rotational velocity or smaller Rossby number as observed in the X-ray. This lack of \"super-saturation\" supports the idea of coronal-stripping as the cause of saturation and super-saturation in stellar chromospheres and corona, but the detailed underlying mechanism is still under investigation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-07-09T14:20:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "chromospheric emission",
      "smaller rossby number",
      "blanco 4m telescope",
      "moderate resolution optical spectra",
      "stellar chromospheres"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/738/2/164",
      "journal": "The Astrophysical Journal",
      "year": 2011,
      "month": "Sep",
      "volume": 738,
      "number": 2,
      "pages": 164
    },
    "note": {
      "typesetting": "TeX",
      "pages": 28,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 917697,
      "adsabs": "2011ApJ...738..164C"
    }
  }
}