The internal composition of white dwarfs depends on the adopted 12C(a, 1')160 rate as well as on the treatment of convection in the envelope. In this paper we show that CO white dwarfs are strongly enriched in oxygen in the central regions and that this property is even strengthened by the crystallization process. These profiles are relevant for the cooling time scales of white dwarfs as well for determining the ignition density of thermonuclear supernovae.
Isern, J. [et al.]. On the internal composition of white dwarfs. "Nuclear physics A", Maig 2001, vol. 688, núm. 1-2, p. 122-125.