Gravitational-darkening of Altair from interferometry A. Domiciano de Souza, P. Kervella, S. Jankov, F. Vakili, N. Ohishi, T. E. Nordgren and L. Abe A&A, 442 2 (2005) 567-578 Published online: 07 October 2005 DOI: 10.1051/0004-6361:20042476