1. Department of Astronomy and Space Sciences, Faculty of Science, Ankara University, Tandogan, 06100 Ankara, Turkey
2. Dpto. Astrofisica, Facultad de CC. Fisicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain
3. Astronomical Observatory, Jagiellonian University, ul. Orla 171, PL-30-244 Krakow, Poland
4. European Southern Observatory, Karl-Schwarzschild-Str 2, D-85748 Garching bei München, Germany
5. INAF – Osservatorio Astrofisico di Catania, via S. Sofia, 78, I-95123 Catania, Italy
6. Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany
7. Feza Gürsey Center for Physics and Mathematics, Boğaziçi University, Kuleli/Üsküdar, 34684 Istanbul, Turkey