The evolution of white dwarfs resulting from helium-enhanced, low-metallicity progenitor stars Leandro G. Althaus, Francisco De Gerónimo, Alejandro Córsico, Santiago Torres and Enrique García-Berro A&A, 597 (2017) A67 Published online: 03 January 2017 DOI: 10.1051/0004-6361/201629909