Editors' note: Astron. Nachr. 9/2013.Published in:Astronomische Nachrichten, 2013, v. 334, n. 9, p. n/a, doi. 10.1002/asna.201390017By:Barnaföldi, Gergely Gábor;Forgás-Dajka, Emese;Kiss, Csaba;Verebélyi, ErikaPublication type:Article