The effects of element diffusion on the pulsational properties of variable DA white dwarf stars

We explore the effects of element diffusion due to gravitational settling and thermal and chemical diffusion on the pulsational properties of DA white dwarfs. To this end, we employ an updated evolutionary code coupled with a pulsational, finite difference code for computing the linear, non-radial g...

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Autores principales: Córsico, Alejandro Hugo, Benvenuto, Omar Gustavo, Althaus, Leandro Gabriel, Serenelli, Aldo Marcelo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2002
Materias:
Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84670
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84670
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
spellingShingle Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
Córsico, Alejandro Hugo
Benvenuto, Omar Gustavo
Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
topic_facet Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
description We explore the effects of element diffusion due to gravitational settling and thermal and chemical diffusion on the pulsational properties of DA white dwarfs. To this end, we employ an updated evolutionary code coupled with a pulsational, finite difference code for computing the linear, non-radial g-modes in the adiabatic approximation. We follow the evolution of a 0.55-M⊙ white dwarf model in a self-consistent way with the evolution of chemical abundance distribution as given by time-dependent diffusion processes. Results are compared with the standard treatment of diffusive equilibrium in the trace element approximation. Appreciable differences are found between the two employed treatments. We conclude that time-dependent element diffusion plays an important role in determining the whole oscillation pattern and the temporal derivative of the periods in DAV white dwarfs. In addition, we discuss the plausibility of the standard description employed in accounting for diffusion in most white dwarf asteroseismological studies.
format Articulo
Articulo
author Córsico, Alejandro Hugo
Benvenuto, Omar Gustavo
Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
author_facet Córsico, Alejandro Hugo
Benvenuto, Omar Gustavo
Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
author_sort Córsico, Alejandro Hugo
title The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title_short The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title_full The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title_fullStr The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title_full_unstemmed The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title_sort effects of element diffusion on the pulsational properties of variable da white dwarf stars
publishDate 2002
url http://sedici.unlp.edu.ar/handle/10915/84670
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