1. Special Astrophysical Observatory, Nizhniy Arkhyz 369167, Russia
2. Department of Physics, Royal Military College of Canada, Kingston, Ontario K7K 7B4, Canada
3. National Research Council of Canada, Herzberg Astronomy and Astrophysics Program, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada
4. Department of Physics and Astronomy, Uppsala University, SE-751 20 Uppsala, Sweden
5. Observatorio do Valongo, Universidade Federal do Rio de Janeiro, 43, CEP 20080-090, Rio de Janeiro, Brazil
6. European Organisation for Astronomical Research in the Southern Hemisphere, Casilla 19001, Santiago 19, Chile
7. Dominion Astrophysical Observatory, NRC-HIA, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada
8. European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
9. Moscow State University, Moscow 119991, Russia
10. Tavrian National University, Vernadskiys Avenue 4, Simferopol, Crimea