F. Mavromatakis(1), B. Aschenbach(2), P. Boumis(1,3), J. Papamastorakis(1,4) ((1) University of Crete, Heraklion, Crete, Greece (2) Max-Planck-Institut fur extraterrestrische Physik, Garching, Germany (3) Institute of Astronomy & Astrophysics, National Observatory of Athens, Greece (4) Foundation for Research and Technology-Hellas, Heraklion, Crete, Greece)
