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Evolutionary and pulsational properties of white dwarf stars
Leandro G. Althaus, Alejandro H. Córsico, Jordi Isern +1
Abridged. White dwarf stars are the final evolutionary stage of the vast majority of stars, including our Sun. The study of white dwarfs has potential applications to different fie…
Evolution of white dwarf stars with high-metallicity progenitors: the role of 22Ne diffusion
Leandro G. Althaus, Enrique García-Berro, Isabel Renedo +3
Motivated by the strong discrepancy between the main sequence turn-off age and the white dwarf cooling age in the metal-rich open cluster NGC 6791, we compute a grid of white dwarf…
New chemical profiles for the asteroseismology of ZZ Ceti stars
L. G. Althaus, A. H. Córsico, A. Bischoff-Kim +4
We compute new chemical profiles for the core and envelope of white dwarfs appropriate for pulsational studies of ZZ Ceti stars. These profiles are extracted from the complete evol…
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
Enrique García-Berro, Santiago Torres, Leandro G. Althaus +6
NGC 6791 is a well studied open cluster1 that it is so close to us that can be imaged down to very faint luminosities. The main sequence turn-off age (~8 Gyr) and the age derived f…
New cooling sequences for old white dwarfs
Isabel Renedo, Leandro G. Althaus, Marcelo M. Miller Bertolami +4
We present full evolutionary calculations appropriate for the study of hydrogen-rich DA white dwarfs. This is done by evolving white dwarf progenitors from the zero age main sequen…
Axions and the pulsation periods of variable white dwarfs revisited
J. Isern, E. García-Berro, L. G. Althaus +1
Axions are the natural consequence of the introduction of the Peccei-Quinn symmetry to solve the strong CP problem. All the efforts to detect such elusive particles have failed up…