Long-term spectropolarimetric monitoring of the cool supergiant betelgeuse

  title={Long-term spectropolarimetric monitoring of the cool supergiant betelgeuse},
  author={I. Bedecarrax and Pascal Petit and Michel Auri{\`e}re and Jason H. Grunhut and Gregg A. Wade and Andrea Chiavassa and Jean-François Donati and Renada Konstantinova-Antova and Guy Perrin},
  journal={Eas Publications Series},
We report on a long-term monitoring of the cool supergiant Betelgeuse, using the NARVAL and ESPaDOnS high-resolution spectropolarimeters, respectively installed at Telescope Bernard Lyot (Pic du Midi Observatory, France) and at the Canada-France-Hawaii Telescope (Mauna Kea Observatory, Hawaii). The data set, constituted of circularly polarized (Stokes V) and intensity (Stokes I) spectra, was collected between 2010 and 2012. We investigate here the temporal evolution of magnetic field… 

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