1. Department of Physics and Astronomy, University College London , Gower Street, WC1E 6BT London , UK
2. Materials Spectroscopy Laboratory, Institute of Physics, University of Rzeszów , Pigonia 1 Street, PL-35-310 Rzeszów , Poland
3. Department of Environmental, Earth, and Atmospheric Sciences, University of Massachusetts Lowell , Lowell, MA 01854 , USA
4. Instituto de Astrofísica de Canarias (IAC), Calle Vía Láctea s/n , E-38200 La Laguna, Tenerife , Spain
5. Main Astronomical Observatory, Academy of Sciences of the Ukraine , 27 Zabolotnoho, UA-03143 Kyiv , Ukraine
6. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences , Rabianska 8, PL-87-100 Toruń , Poland