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Artículo

The evolution of ultra-massive white dwarfs

Camisassa, María EugeniaIcon ; Althaus, Leandro GabrielIcon ; Corsico, Alejandro HugoIcon ; de Gerónimo, Francisco CésarIcon ; Miller Bertolami, Marcelo MiguelIcon ; Novarino, Maria Leonela; Rohrmann, Rene DanielIcon ; Wachlin, Felipe CarlosIcon ; García Berro, Enrique
Fecha de publicación: 27/05/2019
Editorial: EDP Sciences
Revista: Astronomy and Astrophysics
ISSN: 0004-6361
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

Ultra-massive white dwarfs are powerful tools used to study various physical processes in the asymptotic giant branch (AGB), type Ia supernova explosions, and the theory of crystallization through white dwarf asteroseismology. Despite the interest in these white dwarfs, there are few evolutionary studies in the literature devoted to them. Here we present new ultra-massive white dwarf evolutionary sequences that constitute an improvement over previous ones. In these new sequences we take into account for the first time the process of phase separation expected during the crystallization stage of these white dwarfs by relying on the most up-to-date phase diagram of dense oxygen/neon mixtures. Realistic chemical profiles resulting from the full computation of progenitor evolution during the semidegenerate carbon burning along the super-AGB phase are also considered in our sequences. Outer boundary conditions for our evolving models are provided by detailed non-gray white dwarf model atmospheres for hydrogen and helium composition. We assessed the impact of all these improvements on the evolutionary properties of ultra-massive white dwarfs, providing updated evolutionary sequences for these stars. We conclude that crystallization is expected to affect the majority of the massive white dwarfs observed with effective temperatures below 40 000 K. Moreover, the calculation of the phase separation process induced by crystallization is necessary to accurately determine the cooling age and the mass-radius relation of massive white dwarfs. We also provide colors in the Gaia photometric bands for our H-rich white dwarf evolutionary sequences on the basis of new model atmospheres. Finally, these new white dwarf sequences provide a new theoretical frame to perform asteroseismological studies on the recently detected ultra-massive pulsating white dwarfs.
Palabras clave: stars: evolution , stars: interiors , stars: white dwarfs
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution 2.5 Unported (CC BY 2.5)
Identificadores
URI: http://hdl.handle.net/11336/124435
URL: https://www.aanda.org/10.1051/0004-6361/201833822
DOI: https://doi.org/10.1051/0004-6361/201833822
Colecciones
Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos(ICATE)
Articulos de INST.D/CS ASTRONOMICAS D/LA TIERRA Y DEL ESPACIO
Citación
Camisassa, María Eugenia; Althaus, Leandro Gabriel; Corsico, Alejandro Hugo; de Gerónimo, Francisco César; Miller Bertolami, Marcelo Miguel; et al.; The evolution of ultra-massive white dwarfs; EDP Sciences; Astronomy and Astrophysics; 625; 27-5-2019; 1-12
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