On the origin of white dwarfs with carbon-dominated atmospheres: The case of H1504+65

Aims. We explore different evolutionary scenarios to explain the helium, deficiency observed, in H1504+65, the most massive known PG1159 star. Methods. We concentrate mainly on the possibility that this star could be the result of mass loss shortly after its born-again and during its subsequent evol...

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Autores principales: Althaus, Leandro Gabriel, Córsico, Alejandro Hugo, Torres, S., García-Berro, E.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Astronómicas
Stars: AGB and post-AGB
Stars: evolution
Stars: interiors
Stars: white dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82748
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82748
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: AGB and post-AGB
Stars: evolution
Stars: interiors
Stars: white dwarfs
spellingShingle Ciencias Astronómicas
Stars: AGB and post-AGB
Stars: evolution
Stars: interiors
Stars: white dwarfs
Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
Torres, S.
García-Berro, E.
On the origin of white dwarfs with carbon-dominated atmospheres: The case of H1504+65
topic_facet Ciencias Astronómicas
Stars: AGB and post-AGB
Stars: evolution
Stars: interiors
Stars: white dwarfs
description Aims. We explore different evolutionary scenarios to explain the helium, deficiency observed, in H1504+65, the most massive known PG1159 star. Methods. We concentrate mainly on the possibility that this star could be the result of mass loss shortly after its born-again and during its subsequent evolution through the [WCL] stage. This possibility is consistent with observational evidence of extensive mass-loss events in Sakurai's object and is in line with the finding that these mass losses give rise to PG1159 models with thin heliumrich envelopes and high rates of period change, as demanded by the pulsating star PG1159-035. We compute the post-born-again evolution of massive sequences by taking into account different mass-loss rate histories. Results. Our results show that stationary winds during the post-born-again evolution fail to remove completely the helium-rich envelope and are therefore unable to explain the helium deficiency observed, in H1504+65. Stationary winds during the Sakurai and [WCL] stages remove at most half of the envelope that survives the violent hydrogen burning during the born-again phase. Conclusions. In view of our results, the proposed evolutionary sequence of born-again stars to H.1504+65 and then to white dwarfs with carbon-rich atmospheres is difficult to reproduce unless the entire helium-rich envelope is ejected by non-stationary mass-loss episodes during the Sakurai stage.
format Articulo
Articulo
author Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
Torres, S.
García-Berro, E.
author_facet Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
Torres, S.
García-Berro, E.
author_sort Althaus, Leandro Gabriel
title On the origin of white dwarfs with carbon-dominated atmospheres: The case of H1504+65
title_short On the origin of white dwarfs with carbon-dominated atmospheres: The case of H1504+65
title_full On the origin of white dwarfs with carbon-dominated atmospheres: The case of H1504+65
title_fullStr On the origin of white dwarfs with carbon-dominated atmospheres: The case of H1504+65
title_full_unstemmed On the origin of white dwarfs with carbon-dominated atmospheres: The case of H1504+65
title_sort on the origin of white dwarfs with carbon-dominated atmospheres: the case of h1504+65
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/82748
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AT torress ontheoriginofwhitedwarfswithcarbondominatedatmospheresthecaseofh150465
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