Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning

The detection of pulsations in white dwarfs with low mass offers the possibility of probing their internal structures through asteroseismology and placing constraints on the binary evolutionary processes involved in their formation. In this Letter, we assess the impact of stable H burning on the pul...

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Detalles Bibliográficos
Autores principales: Córsico, Alejandro Hugo, Althaus, Leandro Gabriel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85188
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85188
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
Stars: oscillations
White dwarfs
spellingShingle Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning
topic_facet Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
description The detection of pulsations in white dwarfs with low mass offers the possibility of probing their internal structures through asteroseismology and placing constraints on the binary evolutionary processes involved in their formation. In this Letter, we assess the impact of stable H burning on the pulsational stability properties of low-mass He-core white dwarf models resulting from binary star evolutionary calculations. We found that besides a dense spectrum of unstable radial modes and nonradial g and p modes driven by the κ mechanism due to the partial ionization of H in the stellar envelope, some unstable g modes with short pulsation periods are also powered by H burning via the ε mechanism of mode driving. This is the first time that ε destabilized modes are found in models representative of cool white dwarf stars. The short periods recently detected in the pulsating low-mass white dwarf SDSS J111215.82+111745.0 could constitute the first evidence of the existence of stable H burning in these stars, in particular in the so-called extremely low-mass white dwarfs.
format Articulo
Articulo
author Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
author_facet Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
author_sort Córsico, Alejandro Hugo
title Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning
title_short Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning
title_full Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning
title_fullStr Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning
title_full_unstemmed Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning
title_sort short-period g-mode pulsations in low-mass white dwarfs triggered by h-shell burning
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85188
work_keys_str_mv AT corsicoalejandrohugo shortperiodgmodepulsationsinlowmasswhitedwarfstriggeredbyhshellburning
AT althausleandrogabriel shortperiodgmodepulsationsinlowmasswhitedwarfstriggeredbyhshellburning
bdutipo_str Repositorios
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