Evolution and colors of helium-core white dwarfs stars with high-metallicity progenitors

Aims. Motivated by the recent detection of single and binary He-core white dwarfs in metal-rich clusters, we present a full set of evolutionary calculations and colors appropriate to the study of these white dwarfs. The paper is also aimed at investigating whether stable hydrogen burning may constit...

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Autores principales: Althaus, Leandro Gabriel, Panei, Jorge Alejandro, Romero, Alejandra Daniela, Rohrmann, René, Córsico, Alejandro Hugo, García Berro, Enrique, Miller Bertolami, Marcelo Miguel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Astronómicas
Evolution of stars
White dwarfs
Clusters
Galaxies
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/93542
https://www.aanda.org/articles/aa/abs/2009/28/aa11640-09/aa11640-09.html
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-93542
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
Evolution of stars
White dwarfs
Clusters
Galaxies
spellingShingle Ciencias Astronómicas
Evolution of stars
White dwarfs
Clusters
Galaxies
Althaus, Leandro Gabriel
Panei, Jorge Alejandro
Romero, Alejandra Daniela
Rohrmann, René
Córsico, Alejandro Hugo
García Berro, Enrique
Miller Bertolami, Marcelo Miguel
Evolution and colors of helium-core white dwarfs stars with high-metallicity progenitors
topic_facet Ciencias Astronómicas
Evolution of stars
White dwarfs
Clusters
Galaxies
description Aims. Motivated by the recent detection of single and binary He-core white dwarfs in metal-rich clusters, we present a full set of evolutionary calculations and colors appropriate to the study of these white dwarfs. The paper is also aimed at investigating whether stable hydrogen burning may constitute a major source of energy for massive He-core white dwarfs resulting from high-metallicity progenitors. Methods. White dwarf sequences are derived by considering the evolutionary history of progenitor stars with supersolar metallicities. We also incorporate a self-consistent, time-dependent treatment of gravitational settling and chemical diffusion, as well as of the residual nuclear burning. Results. We find that the influence of residual nuclear burning during the late stages of white dwarf evolution is strongly dependent on the chemical diffusion at the base of the hydrogen-rich envelope. When no diffusion is considered, residual hydrogen burning strongly influences the advanced stages of white dwarf cooling, introducing evolutionary delays of several Gyr. By contrast, when diffusion is taken into account, the role of residual nuclear burning is strongly mitigated, and the evolution is only dictated by the thermal content stored in the ions. In addition, for all of our sequences, we provide accurate color and magnitudes on the basis of new and improved non-gray model atmospheres that explicitly include Lyα quasi-molecular opacity
format Articulo
Articulo
author Althaus, Leandro Gabriel
Panei, Jorge Alejandro
Romero, Alejandra Daniela
Rohrmann, René
Córsico, Alejandro Hugo
García Berro, Enrique
Miller Bertolami, Marcelo Miguel
author_facet Althaus, Leandro Gabriel
Panei, Jorge Alejandro
Romero, Alejandra Daniela
Rohrmann, René
Córsico, Alejandro Hugo
García Berro, Enrique
Miller Bertolami, Marcelo Miguel
author_sort Althaus, Leandro Gabriel
title Evolution and colors of helium-core white dwarfs stars with high-metallicity progenitors
title_short Evolution and colors of helium-core white dwarfs stars with high-metallicity progenitors
title_full Evolution and colors of helium-core white dwarfs stars with high-metallicity progenitors
title_fullStr Evolution and colors of helium-core white dwarfs stars with high-metallicity progenitors
title_full_unstemmed Evolution and colors of helium-core white dwarfs stars with high-metallicity progenitors
title_sort evolution and colors of helium-core white dwarfs stars with high-metallicity progenitors
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/93542
https://www.aanda.org/articles/aa/abs/2009/28/aa11640-09/aa11640-09.html
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