Affiliation: | (1) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhni Arkhyz, Karachai-Cherkessian Republic, 357147, Russia;(2) Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile;(3) SternbergAstronomical Institute, Moscow University, Universitetskii pr. 13, Moscow, 119992, Russia;(4) Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, 53121, Germany |