The evolution of iron-core white dwarfs

Recent measurements by Hipparcos present observational evidence supporting the existence of some white dwarf (WD) stars with iron-rich core composition. In connection with this, the present paper is aimed at exploring the structure and evolution of iron-core WDs by means of a detailed and updated ev...

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Detalles Bibliográficos
Autores principales: Panei, Jorge Alejandro, Althaus, Leandro Gabriel, Benvenuto, Omar Gustavo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Ciencias Astronómicas
Stars: evolution
Stars: interiors
White dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83561
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83561
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
White dwarfs
spellingShingle Ciencias Astronómicas
Stars: evolution
Stars: interiors
White dwarfs
Panei, Jorge Alejandro
Althaus, Leandro Gabriel
Benvenuto, Omar Gustavo
The evolution of iron-core white dwarfs
topic_facet Ciencias Astronómicas
Stars: evolution
Stars: interiors
White dwarfs
description Recent measurements by Hipparcos present observational evidence supporting the existence of some white dwarf (WD) stars with iron-rich core composition. In connection with this, the present paper is aimed at exploring the structure and evolution of iron-core WDs by means of a detailed and updated evolutionary code. In particular, we examined the evolution of the central conditions, neutrino luminosity, surface gravity, crystallization, internal luminosity profile and ages. We find that the evolution of iron-rich WDs is markedly different from that of their carbon-oxygen counterparts. In particular, cooling is strongly accelerated (up to a factor of 5 for models with pure iron composition) as compared with the standard case. Thus, if iron WDs were very numerous, some of them would have had time enough to evolve at lower luminosities than that corresponding to the fall-off in the observed WD luminosity function.
format Articulo
Articulo
author Panei, Jorge Alejandro
Althaus, Leandro Gabriel
Benvenuto, Omar Gustavo
author_facet Panei, Jorge Alejandro
Althaus, Leandro Gabriel
Benvenuto, Omar Gustavo
author_sort Panei, Jorge Alejandro
title The evolution of iron-core white dwarfs
title_short The evolution of iron-core white dwarfs
title_full The evolution of iron-core white dwarfs
title_fullStr The evolution of iron-core white dwarfs
title_full_unstemmed The evolution of iron-core white dwarfs
title_sort evolution of iron-core white dwarfs
publishDate 2000
url http://sedici.unlp.edu.ar/handle/10915/83561
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