{
  "id": "2007.12779",
  "version": "v1",
  "published": "2020-07-24T21:49:38.000Z",
  "updated": "2020-07-24T21:49:38.000Z",
  "title": "Synthetic Spectra of Rotating Stars",
  "authors": [
    "Mikhail Lipatov",
    "Timothy D. Brandt"
  ],
  "comment": "17 pages, 10 figures, ApJ accepted. PARS is available at https://github.com/mlipatov/paint_atmospheres",
  "categories": [
    "astro-ph.SR",
    "astro-ph.IM"
  ],
  "abstract": "Many early-type stars have oblate surfaces, spatial temperature variations, and spectral line broadening that indicate large rotational velocities. Rotation ought to have a significant effect on the full spectra of such stars. To infer structural and life history parameters from their spectra, one must integrate specific intensity over the two-dimensional surfaces of corresponding stellar models. Toward this end, we offer PARS (Paint the Atmospheres of Rotating Stars) -- an integration scheme based on models that incorporate solid body rotation, Roche mass distribution, and collinearity of gravity and energy flux (https://github.com/mlipatov/paint_atmospheres). The scheme features a closed-form expression for the azimuthal integral, a high-order numerical approximation of the longitudinal integral, and a precise calculation of surface effective temperature at rotation rates up to 99.9% of Keplerian limit. Extensions of the scheme include synthetic color-magnitude diagrams and planetary transit curves.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-07-24T21:49:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "rotating stars",
      "synthetic spectra",
      "incorporate solid body rotation",
      "large rotational velocities",
      "life history parameters"
    ],
    "tags": [
      "github project"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}