On the Evolution of Hydrogen-Deficient White Dwarfs

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

Warwick

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 progenitorstars, all relevant energy sources, element diffusion, and outerboundary conditions provided by new and detailed non-gray white dwarfmodel atmospheres for pure helium composition. Model atmospheres are based on the mostup-to-date physical inputs. The calculations are extended down to aneffective temperature of 2500 K. Our calculations provide a homogeneous set ofevolutionary cooling tracks appropriate for mass and age determinationsof old hydrogen-deficient white dwarfs.