P. Boumis (1), S. Akras (1), P. A. M. van Hoof (2), G. C. Van de Steene (2), J. Papamastorakis (3), J. A. Lopez (4) ((1) Institute of Astronomy & Astrophysics, National Observatory of Athens, Greece, (2) Royal Observatory of Belgium, Brussels, Belgium (3) University of Crete, Heraklion, Crete, Greece (4) Instituto de Astronomia, UNAM, Ensenada, Mexico)
