Institution: | (1) Abastumani Astrophysical Observatory, Georgian Academy of Sciences, A.Kazbegi ave. 2-a, Tbilisi, 380060, Georgia;(2) Sternberg State Astronomical Institute, Universitetskij Prospect 13, Moscow, 119899, Russia;(3) Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, P.O. Box 586, 34100 Trieste, Italy |