1. Shahid Beheshti University, Faculty of Physics, Department of Astronomy and Astrophysics, Tehran, Iran, 19839
2. University of Zanjan, Faculty of Science, Department of Physics, Zanjan, Iran, 45195–313
3. Institute for Research in Fundamental Sciences, School of Astronomy, Tehran, Iran, 19395-5531
4. European Southern Observatory, Karl-Schwarzschild-strasse 2, D-8046 Garching bei Munchen, Germany