Browsing by Subject "ultra-massive white dwarfs"

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    Evolutionary and Pulsational Properties of Ultra-massive White Dwarfs. The Role of Oxygen-Neon Phase Separation.
    (2018-07) De Geronimo, F.C.; Camisassa, M.E.; Corsico, A.H.; Althaus, L.G.; Castanheira, B.; Vanderbosch, Z.; Montgomery, M.
    Ultra-massive hydrogen-rich white dwarf stars are expected to harbour oxygen/neon cores resulting from semidegenerate carbon burning when the progenitor star evolves through the super asymptotic giant branch (S-AGB) phase. These stars are expected to be crystallized by the time they reach the ZZ Ceti domain. We show that crystallization leads to a phase separation of oxygen and neon in the core of ultra-massive white dwarfs, which impacts markedly the pulsational properties, thus offering a unique opportunity to infer and test the process of crystallization and phase separation in white dwarf stars.
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    Evolutionary and pulsational properties of ultra-massive white dwarfs. The role of oxygen-neon phase separation.
    (2018-07) De Gerónimo, F.C.; Camisassa, M.E.; Córsico, A.H.; Althaus, L.G.; Castanheira, B.; Vanderbosch, Z.; Montgomery, M.
    Ultra-massive hydrogen-rich white dwarfs (WDs) are expected to harbor oxygen/neon cores resulting from semi-degenerate carbon burning when the progenitor star evolves through the super asymptotic giant branch (SAGB) phase. These stars are expected to be crystallized by the time they reach the ZZ Ceti domain. We show that crystallization leads to a phase separation of oxygen and neon in the core of ultra-massive WDs, which impacts markedly the pulsational properties, thus offering a unique opportunity to study the processes of crystallization and to infer the core chemical composition in WD stars.