XL Polish Astronomical Society Meeting, 13-17 Sept. 2021, University of Szczecin. PolandProceedings of the Polish Astronomical Society XL Zjazdu Polskiego Towarzystwa Astronomicznego-40th Meeting of the Polish Astronomical Society XL Zjazdu Polskiego Towarzystwa Astronomicznego-40th Meeting of the Polish Astronomical Society, University of Szczecin, Sep 2021, Szczecin, Poland. pp.60-63, ⟨10.1051/0004-6361/202141701⟩