Rotten Egg nebula: the magnetic field of a binary evolved star M. L. Leal-Ferreira, W. H. T. Vlemmings, P. J. Diamond, A. Kemball, N. Amiri and J.-F. Desmurs A&A, 540 (2012) A42 Published online: 22 March 2012 DOI: 10.1051/0004-6361/201118303