Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
We explore the adiabatic pulsational properties of massive white dwarf stars with hydrogen-rich envelopes and oxygen/neon and carbon/oxygen cores. To this end, we compute the cooling of massive white dwarf models for both core compositions taking into account the evolutionary history of the progenit...
| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2004
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/84435 |
| Aporte de: |
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I19-R120-10915-84435 |
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| 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 Evolution - Stars Oscillations Stars White dwarfs - Stars |
| spellingShingle |
Ciencias Astronómicas Evolution - Stars Oscillations Stars White dwarfs - Stars Córsico, Alejandro Hugo García Berro, E. Althaus, Leandro Gabriel Isern, J. Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores |
| topic_facet |
Ciencias Astronómicas Evolution - Stars Oscillations Stars White dwarfs - Stars |
| description |
We explore the adiabatic pulsational properties of massive white dwarf stars with hydrogen-rich envelopes and oxygen/neon and carbon/oxygen cores. To this end, we compute the cooling of massive white dwarf models for both core compositions taking into account the evolutionary history of the progenitor stars and the chemical evolution caused by time-dependent element diffusion. In particular, for the oxygen/neon models we adopt the chemical profile resulting from repeated carbon-burning shell flashes expected in very massive white dwarf progenitors. For carbon/oxygen white dwarfs we consider the chemical profiles resulting from phase separation upon crystallization. For both compositions we also take into account the effects of crystallization on the oscillation eigenmodes. We find that the pulsational properties of oxygen/neon white dwarfs are noticeably different from those made of carbon/oxygen, thus making asteroseismological techniques a promising way to distinguish between the two types of stars and, hence, to obtain valuable information about their progenitors. |
| format |
Articulo Articulo |
| author |
Córsico, Alejandro Hugo García Berro, E. Althaus, Leandro Gabriel Isern, J. |
| author_facet |
Córsico, Alejandro Hugo García Berro, E. Althaus, Leandro Gabriel Isern, J. |
| author_sort |
Córsico, Alejandro Hugo |
| title |
Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores |
| title_short |
Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores |
| title_full |
Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores |
| title_fullStr |
Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores |
| title_full_unstemmed |
Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores |
| title_sort |
pulsations of massive zz ceti stars with carbon/oxygen and oxygen/neon cores |
| publishDate |
2004 |
| url |
http://sedici.unlp.edu.ar/handle/10915/84435 |
| work_keys_str_mv |
AT corsicoalejandrohugo pulsationsofmassivezzcetistarswithcarbonoxygenandoxygenneoncores AT garciaberroe pulsationsofmassivezzcetistarswithcarbonoxygenandoxygenneoncores AT althausleandrogabriel pulsationsofmassivezzcetistarswithcarbonoxygenandoxygenneoncores AT isernj pulsationsofmassivezzcetistarswithcarbonoxygenandoxygenneoncores |
| bdutipo_str |
Repositorios |
| _version_ |
1764820488732803073 |