Artículos de revistas
Updated Evolutionary Sequences for Hydrogen-deficient White Dwarfs
Fecha
2017-04Registro en:
Camisassa, María Eugenia; Althaus, Leandro Gabriel; Rohrmann, Rene Daniel; García Berro, Enrique; Torres, Santiago; et al.; Updated Evolutionary Sequences for Hydrogen-deficient White Dwarfs; IOP Publishing; Astrophysical Journal; 839; 1; 4-2017; 1-11
0004-637X
CONICET Digital
CONICET
Autor
Camisassa, María Eugenia
Althaus, Leandro Gabriel
Rohrmann, Rene Daniel
García Berro, Enrique
Torres, Santiago
Corsico, Alejandro Hugo
Wachlin, Felipe Carlos
Resumen
We present a set of full evolutionary sequences for white dwarfs with hydrogen-deficient atmospheres. We take into account the evolutionary history of the progenitor stars, all the relevant energy sources involved in the cooling, element diffusion in the very outer layers, and outer boundary conditions provided by new and detailed non-gray white dwarf model atmospheres for pure helium composition. These model atmospheres are based on the most up-to-date physical inputs. Our calculations extend down to very low effective temperatures, of ∼2500 K, provide a homogeneous set of evolutionary cooling tracks that are appropriate for mass and age determinations of old hydrogen-deficient white dwarfs, and represent a clear improvement over previous efforts, which were computed using gray atmospheres.