1. University of Ege, Department of Astronomy and Space Sciences, Bornova, 35100 İzmir, Turkey
2. Theoretical Astrophysics Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
3. Anton Pannekoek Institute, University of Amsterdam, Science Park 904, NL-1098 XH Amsterdam, the Netherlands
4. Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands
5. Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK