Evidence of thin helium envelopes in PG 1159 stars

We present evidence that PG 1159 stars could harbor He-rich envelopes substantially thinner than those predicted by current evolutionary models with current estimates of mass loss, which may be attributable to an extensive mass-loss episode during the born-again AGB phase. Specifically, we show that...

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Autores principales: Althaus, Leandro Gabriel, Córsico, Alejandro Hugo, Miller Bertolami, Marcelo Miguel, García-Berro, E., Kepler, S. O.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2008
Materias:
Ciencias Astronómicas
Dense matter
Diffusion
Stars: abundances
Stars: evolution
Stars: interiors
White dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83005
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83005
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
Dense matter
Diffusion
Stars: abundances
Stars: evolution
Stars: interiors
White dwarfs
spellingShingle Ciencias Astronómicas
Dense matter
Diffusion
Stars: abundances
Stars: evolution
Stars: interiors
White dwarfs
Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
Miller Bertolami, Marcelo Miguel
García-Berro, E.
Kepler, S. O.
Evidence of thin helium envelopes in PG 1159 stars
topic_facet Ciencias Astronómicas
Dense matter
Diffusion
Stars: abundances
Stars: evolution
Stars: interiors
White dwarfs
description We present evidence that PG 1159 stars could harbor He-rich envelopes substantially thinner than those predicted by current evolutionary models with current estimates of mass loss, which may be attributable to an extensive mass-loss episode during the born-again AGB phase. Specifically, we show that the models with thin He-rich envelopes predict remarkably large magnitudes of the rates of period change of the trapped and untrapped modes observed in the pulsating star PG 1159-035. This is a consequence of the much shorter evolutionary timescale of the models with thin He-rich envelopes during the low-gravity PG 1159 regime. Our findings are particularly interesting in view of the suggestion of an evolutionary link between the helium-deficient PG 1159 star H1504+65 and the recently discovered white dwarfs with almost pure carbon atmospheres.
format Articulo
Articulo
author Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
Miller Bertolami, Marcelo Miguel
García-Berro, E.
Kepler, S. O.
author_facet Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
Miller Bertolami, Marcelo Miguel
García-Berro, E.
Kepler, S. O.
author_sort Althaus, Leandro Gabriel
title Evidence of thin helium envelopes in PG 1159 stars
title_short Evidence of thin helium envelopes in PG 1159 stars
title_full Evidence of thin helium envelopes in PG 1159 stars
title_fullStr Evidence of thin helium envelopes in PG 1159 stars
title_full_unstemmed Evidence of thin helium envelopes in PG 1159 stars
title_sort evidence of thin helium envelopes in pg 1159 stars
publishDate 2008
url http://sedici.unlp.edu.ar/handle/10915/83005
work_keys_str_mv AT althausleandrogabriel evidenceofthinheliumenvelopesinpg1159stars
AT corsicoalejandrohugo evidenceofthinheliumenvelopesinpg1159stars
AT millerbertolamimarcelomiguel evidenceofthinheliumenvelopesinpg1159stars
AT garciaberroe evidenceofthinheliumenvelopesinpg1159stars
AT keplerso evidenceofthinheliumenvelopesinpg1159stars
bdutipo_str Repositorios
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