1. ARDASTELLA Research Group, Institute of Physics, Pedagogical University of Krakow, ul. Podchora̧żych 2, PL-30-084 Kraków, Poland
2. Nicolaus Copernicus Astronomical Centre of the Polish Academy of Sciences, ul. Bartycka 18, PL-00-716 Warsaw, Poland
3. Dr. Remeis-Sternwarte and ECAP, Astronomical Institute, University of Erlangen-Nürnberg, Sternwartstr. 7, D-96049 Bamberg, Germany
4. INAF – Osservatorio Astrofisico di Torino, Strada dell’Osservatorio 20, I-10025 Pino Torinese, Italy
5. Instituto de Fisica y Astronomia, Facultad de Ciencias, Universidad de Valparaiso, Gran Bretana 1111, Playa Ancha 2360102, Valparaiso, Chile
6. European Southern Observatory, Alonso de Cordóva 3107, Santiago, Chile
7. Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO 65897, USA
8. Departament de Fisica, Universitat Politecnica de Catalunya, c/ Esteve Terrades 5, E-08860 Castelldefels, Spain
9. Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
10. Department of Astronomy, Beijing Normal University, Beijing 100875, PR China
11. DIRAC Institute, Department of Astronomy, University of Washington, Seattle, WA 98195-1580, USA