Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning
- Autores
- Córsico, Alejandro Hugo; Althaus, Leandro Gabriel
- Año de publicación
- 2014
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata - Materia
-
Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/85188
Ver los metadatos del registro completo
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Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burningCórsico, Alejandro HugoAlthaus, Leandro GabrielCiencias AstronómicasStars: evolutionStars: interiorsStars: oscillationsWhite dwarfsThe 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.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plata2014-09-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/85188enginfo:eu-repo/semantics/altIdentifier/issn/2041-8205info:eu-repo/semantics/altIdentifier/doi/10.1088/2041-8205/793/1/L17info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-10T12:19:03Zoai:sedici.unlp.edu.ar:10915/85188Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-10 12:19:03.863SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning |
| title |
Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning |
| spellingShingle |
Short-period g-mode pulsations in low-mass white dwarfs triggered by H-shell burning Córsico, Alejandro Hugo Ciencias Astronómicas Stars: evolution Stars: interiors Stars: oscillations White dwarfs |
| 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 |
| dc.creator.none.fl_str_mv |
Córsico, Alejandro Hugo Althaus, Leandro Gabriel |
| author |
Córsico, Alejandro Hugo |
| author_facet |
Córsico, Alejandro Hugo Althaus, Leandro Gabriel |
| author_role |
author |
| author2 |
Althaus, Leandro Gabriel |
| author2_role |
author |
| dc.subject.none.fl_str_mv |
Ciencias Astronómicas Stars: evolution Stars: interiors Stars: oscillations White dwarfs |
| topic |
Ciencias Astronómicas Stars: evolution Stars: interiors Stars: oscillations White dwarfs |
| dc.description.none.fl_txt_mv |
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. Facultad de Ciencias Astronómicas y Geofísicas Instituto de Astrofísica de La Plata |
| 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. |
| publishDate |
2014 |
| dc.date.none.fl_str_mv |
2014-09-08 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://sedici.unlp.edu.ar/handle/10915/85188 |
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http://sedici.unlp.edu.ar/handle/10915/85188 |
| dc.language.none.fl_str_mv |
eng |
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eng |
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info:eu-repo/semantics/altIdentifier/issn/2041-8205 info:eu-repo/semantics/altIdentifier/doi/10.1088/2041-8205/793/1/L17 |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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