10-12 Jul 2017 Montpellier (France)
Magnetic fields in V471 Tau - rapid rotation in close binaries
Gaitee Hussain  1@  , Evelyne Alecian  2@  , Jean-Francois Donati  3@  , Julien Morin  4@  , Scott Gregory  5@  
1 : European Southern Observatory  (ESO)  -  Website
Karl-Schwarzchild Str. 2 D-85748 Garching bei Munchen -  Germany
2 : IPAG  (IPAG)  -  Website
Université Joseph Fourier - Grenoble 1, INSU, Centre National de la Recherche Scientifique
414 Rue de la piscine - BP 53 38041 GRENOBLE CEDEX 9 -  France
3 : Institut de recherche en astrophysique et planétologie  (IRAP)
Université Paul Sabatier - Toulouse 3, Observatoire Midi-Pyrénées, Centre National de la Recherche Scientifique : UMR5277
4 : Laboratoire Univers et Particules de Montpellier  (LUPM)  -  Website
Université Montpellier 2 - Sciences et Techniques, Institut National de Physique Nucléaire et de Physique des Particules du CNRS, Centre National de la Recherche Scientifique : UMR5299
Université de Montpellier II Place Eugène Bataillon - CC 72 34095 Montpellier Cédex 05 -  France
5 : School of Physics and Astronomy, University of St Andrews
University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK -  United Kingdom

V471 Tau is an eclipsing binary system (white dwarf + K2). Its rapid rotation rate makes it a perfect analogue of the well-studied and characterised K dwarf, AB Dor. We have collected spectropolarimetric datasets closely monitoring the rotation period at three well separated epochs. I will present the surface spot and magnetic field maps of the system at all three epochs and discuss the short and long-term variability shown in our datasets. To conclude I will compare the global properties of its magnetic activity with that of AB Dor.


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