Affiliation: | aInstitute of Astronomy of the Russian Academy of Sciences, 48 Pyatniskaya Str., 119017 Moscow, Russia;bInstitut d’Astrophysique de Paris, UMR 7095 CNRS, Université Pierre et Marie Curie, 98bis Bd Arago, 75014 Paris, France;cAstronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland |