Amorphous alumina in the extended atmosphere of α Orionis T. Verhoelst, L. Decin, R. Van Malderen, S. Hony, J. Cami, K. Eriksson, G. Perrin, P. Deroo, B. Vandenbussche and L. B. F. M. Waters A&A, 447 1 (2006) 311-324 Published online: 27 January 2006 DOI: 10.1051/0004-6361:20053359