Convective cells in Betelgeuse: imaging through spectropolarimetry A. López Ariste, P. Mathias, B. Tessore, A. Lèbre, M. Aurière, P. Petit, N. Ikhenache, E. Josselin, J. Morin and M. Montargès A&A, 620 (2018) A199 Published online: 17 December 2018 DOI: 10.1051/0004-6361/201834178