The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales I. C. Leão, P. de Laverny, D. Mékarnia, J. R. De Medeiros and B. Vandame A&A, 455 1 (2006) 187-194 Published online: 31 July 2006 DOI: 10.1051/0004-6361:20054577