Direct imaging of a massive dust cloud around R Coronae Borealis S. V. Jeffers, M. Min, L. B. F. M. Waters, H. Canovas, M. Rodenhuis, M. de Juan Ovelar, A. L. Chies-Santos and C. U. Keller A&A, 539 (2012) A56 Published online: 23 February 2012 DOI: 10.1051/0004-6361/201117138