On the Evolution of Hydrogen-Deficient White Dwarfs

CAMISASSA, M. E.; ALTHAUS, L. G.; ROHRMANN, R. D.; GARCÍA-BERRO, E.; CÓRSICO, A. H.

Workshop; 20th European White Dwarf Workshop; 2016

We present full evolutionary calculations for hydrogen-deficient whitedwarfs. We take into account the evolutionary history of the progenitor stars, all relevant energy sources, element diffusion, and outer boundary conditions provided by new and detailed non-gray white dwarf model atmospheres for pure helium composition. Model atmospheres are based on the most up-to-date physical inputs. The calculations are extended down to an effective temperature of 2500 K. Our calculations provide a homogeneous set of evolutionary cooling tracks appropriate for mass and age determinations of old hydrogen-deficient white dwarfs.