Institution: | (1) Special Astrophysical Observatory, St. Petersburg Branch, Russian Academy of Sciences, St. Petersburg, 196140, Russia;(2) Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, St. Petersburg, 196140, Russia;(3) Sobolev Astronomical Institute, St. Petersburg State University, Universitetskii pr. 28, St. Petersburg, 198504, Russia |