Convective cells in Betelgeuse: imaging through spectropolarimetryA. López Ariste, P. Mathias, B. Tessore, A. Lèbre, M. Aurière, P. Petit, N. Ikhenache, E. Josselin, J. Morin and M. MontargèsA&A, 620 (2018) A199DOI: https://doi.org/10.1051/0004-6361/201834178