Can pulsating PG 1159 stars place constraints on the occurrence of core overshooting?

The present letter is aimed at exploring the influence of overshooting during the central helium burning in pre-white dwarf progenitors on the pulsational properties of PG 1159 stars. To this end we follow the complete evolution an intermediate-mass white dwarf progenitor from the zero age main sequ...

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Detalles Bibliográficos
Autores principales: Córsico, Alejandro Hugo, Althaus, Leandro Gabriel
Formato: Articulo Contribucion a revista
Lenguaje:Inglés
Publicado: 2005
Materias:
Ciencias Astronómicas
Stars: convection
Stars: evolution
Stars: interiors
Stars: oscillations
Stars: white dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84371
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84371
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: convection
Stars: evolution
Stars: interiors
Stars: oscillations
Stars: white dwarfs
spellingShingle Ciencias Astronómicas
Stars: convection
Stars: evolution
Stars: interiors
Stars: oscillations
Stars: white dwarfs
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Can pulsating PG 1159 stars place constraints on the occurrence of core overshooting?
topic_facet Ciencias Astronómicas
Stars: convection
Stars: evolution
Stars: interiors
Stars: oscillations
Stars: white dwarfs
description The present letter is aimed at exploring the influence of overshooting during the central helium burning in pre-white dwarf progenitors on the pulsational properties of PG 1159 stars. To this end we follow the complete evolution an intermediate-mass white dwarf progenitor from the zero age main sequence through the thermally pulsing and born-again phases to the domain of the PG 1159 stars. Our results suggest that the presence of mode-trapping features in the period spacings of these hot pulsating stars could result from structure in the carbon-oxygen core. We find in particular that in order to get enough core structure consistent with observational demands, the occurrence of overshoot episodes during the central helium burning is needed. This conclusion is valid for thick helium envelopes like those predicted by our detailed evolutionary calculations. If the envelope thickness were substantially smaller, then the occurrence of core overshooting would be more difficult to disentangle from the effects related to the envelope transition zones.
format Articulo
Contribucion a revista
author Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
author_facet Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
author_sort Córsico, Alejandro Hugo
title Can pulsating PG 1159 stars place constraints on the occurrence of core overshooting?
title_short Can pulsating PG 1159 stars place constraints on the occurrence of core overshooting?
title_full Can pulsating PG 1159 stars place constraints on the occurrence of core overshooting?
title_fullStr Can pulsating PG 1159 stars place constraints on the occurrence of core overshooting?
title_full_unstemmed Can pulsating PG 1159 stars place constraints on the occurrence of core overshooting?
title_sort can pulsating pg 1159 stars place constraints on the occurrence of core overshooting?
publishDate 2005
url http://sedici.unlp.edu.ar/handle/10915/84371
work_keys_str_mv AT corsicoalejandrohugo canpulsatingpg1159starsplaceconstraintsontheoccurrenceofcoreovershooting
AT althausleandrogabriel canpulsatingpg1159starsplaceconstraintsontheoccurrenceofcoreovershooting
bdutipo_str Repositorios
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