1. Astronomical Institute, Czech Academy of Sciences, Bocni II 1401, CZ-141 31 Prague, Czech Republic
2. Astronomical Institute, Czech Academy of Sciences, CZ-251 65 Ondřejov, Czech Republic
3. Observatório Nacional, Rua General José Cristino 77, 20921-400 Rio de Janeiro, Brazil
4. Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, GR-15236 Penteli, Athens, Greece
5. Institute of Astrophysics, Foundation for Research and Technology-Hellas, GR-71110 Heraklion, Greece