Pulsation properties of ultra-massive DA white dwarf stars with ONe cores Francisco C. De Gerónimo, Alejandro H. Córsico, Leandro G. Althaus, Felipe C. Wachlin and María E. Camisassa A&A, 621 (2019) A100 Published online: 23 January 2019 DOI: 10.1051/0004-6361/201833789