Detection of non-radial pulsation and faint companion in the symbiotic star CH Cyg

E. Pedretti, J.~D. Monnier, S. Lacour, W.~A. Traub, W.~C. Danchi, P.~G. Tuthill, N.~D. Thureau, R. Millan-Gabet, J.-P. Berger, M.~G. Lacasse, P.~A. Schuller, F.~P. Schloerb, N.~P. Carleton