1. Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), PO Box 55134-441, Valieasr, Maragha, 5517736698, Iran
2. Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
3. Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark