Direct imaging of a massive dust cloud around R Coronae BorealisS. V. Jeffers, M. Min, L. B. F. M. Waters, H. Canovas, M. Rodenhuis, M. de Juan Ovelar, A. L. Chies-Santos and C. U. KellerA&A, 539 (2012) A56DOI: https://doi.org/10.1051/0004-6361/201117138