{
  "id": "2109.08690",
  "version": "v1",
  "published": "2021-09-17T18:00:00.000Z",
  "updated": "2021-09-17T18:00:00.000Z",
  "title": "Short-term variations of surface magnetism and prominences of the young Sun-like star V530 Per",
  "authors": [
    "T. -Q. Cang",
    "P. Petit",
    "J. -F. Donati",
    "C. P. Folsom"
  ],
  "comment": "Accepted by A&A, 17 pages, 13 figures",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Aims: We investigate magnetic tracers in the photosphere and the chromosphere of the ultra-rapid rotator ($P\\sim0.32d$) V530 Per, a cool member of the open cluster $\\alpha$ Persei, to characterize the short-term variability of the magnetic activity and large-scale magnetic field of this prototypical young, rapidly rotating solar-like star. Methods: With time-resolved spectropolarimetric observations spread over four close-by nights, we reconstructed the brightness distribution and large-scale magnetic field geometry of V530 Per through Zeeman-Doppler imaging. Simultaneously, we estimated the short-term variability of the surface through latitudinal differential rotation. Using the same data set, we also mapped the spatial distribution of prominences through tomography of H$\\alpha$ emission. Results: As in our previous study, a large dark spot occupies the polar region of V530 Per with smaller, dark, and bright spots at lower latitudes. The large-scale magnetic field is dominated by a toroidal, mostly axisymmetric component. The maximal radial field strength is equal to $\\sim1$ kG. The surface differential rotation is consistent with a smooth Sun-like shear d$\\Omega = 0.053 \\pm 0.004$ rad.d$^{-1}$, close to the solar shear level. The prominence pattern displays a stable component that is confined close to the corotation radius. We also observe rapidly evolving H$\\alpha$ emitting structures, over timescales ranging from minutes to days. The fast H$\\alpha$ evolution was not linked to any detected photospheric changes in the spot or magnetic coverage.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-09-17T18:00:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "young sun-like star v530",
      "surface magnetism",
      "short-term variations",
      "prominence",
      "short-term variability"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}