White dwarf evolutionary sequences for low-metallicity progenitors: The impact of third dredge-up Leandro G. Althaus, María E. Camisassa, Marcelo M. Miller Bertolami, Alejandro H. Córsico and Enrique García–Berro A&A, 576 (2015) A9 Published online: 13 March 2015 DOI: 10.1051/0004-6361/201424922