{
  "id": "2212.03991",
  "version": "v1",
  "published": "2022-12-07T22:52:53.000Z",
  "updated": "2022-12-07T22:52:53.000Z",
  "title": "Center-to-limb variation of spectral lines and continua observed with SST/CRISP and SST/CHROMIS",
  "authors": [
    "A. G. M. Pietrow",
    "D. Kiselman",
    "O. Andriienko",
    "D. J. M. Petit dit de la Roche",
    "C. J. Díaz Baso",
    "F. Calvo"
  ],
  "comment": "Accepted in A&A. CLV data will be made available with A&A Publication in the near future",
  "categories": [
    "astro-ph.SR",
    "astro-ph.EP"
  ],
  "abstract": "Observations of center-to-limb variations (CLV) of spectral lines and continua provide a good test for the accuracy of models of solar and stellar atmospheric structure and spectral-line formation. They are also widely used to constrain elemental abundances and are becoming increasingly important in atmospheric studies of exoplanets. However, only a few such data sets exist for chromospheric lines. We aim to create a set of standard profiles by means of mosaics made with the CRISP and CHROMIS instruments of the Swedish 1-m Solar Telescope (SST), as well as to explore the robustness of said profiles obtained using this method. For each spectral line we use a mosaic that ranges from the center to the limb. Each of these mosaics are averaged down to 50 individual spectral profiles, spaced by 0.02 in the $\\mu$ scale. These profiles are corrected for p-mode oscillations, and their line parameters (equivalent width, line shift, full-width at half-maximum, and line depth) are then compared against literature values where possible. We present a set of 50 average profiles that are spaced equidistantly along the cosine of the heliocentric angle ($\\mu$) by steps of 0.02 for five continuum points between 4001 and 7772 \\AA, as well as ten of the most commonly observed spectral lines at the SST (Ca II H & K, H$\\beta$, Mg I 5173 \\AA, C I 5380 \\AA, Fe I 6173 \\AA, Fe I 6301 \\AA, H$\\alpha$, O I 7772 \\AA, and Ca II 8542 \\AA). Center-to-limb variation of line profiles and continua are shared in the CDS as machine-readable tables; providing a quantitative constraint on theoretical models that aim to model stellar atmospheres.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-12-07T22:52:53.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spectral line",
      "center-to-limb variation",
      "sst/chromis",
      "stellar atmospheric structure",
      "constrain elemental abundances"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}