1. Observatório Nacional/MCTI , Rua Gen. José Cristino, 77, 20921-400 Rio de Janeiro, Brazil
2. Konkoly Observatory, Research Centre for Astronomy and Earth Sciences , Eötvös Loránd Research Network (ELKH), H-1121 Budapest, Konkoly Thege M. út 15-17, Hungary
3. Institute of Physics, ELTE Eötvös Loránd University , H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary
4. School of Physics and Astronomy, Monash University , VIC 3800, Australia
5. Laboratory of Observational Astrophysics, Saint Petersburg State University , Universitetski pr. 28, 198504 Saint Petersburg, Russia
6. Laboratório Nacional de Astrofísica/MCTI , Rua dos Estados Unidos 154, Bairro das Nações, 37504-364 Itajubá, Brazil
7. Department of Astronomy and McDonald Observatory, The University of Texas , Austin, TX 78712, USA