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Artículo

Asteroseismology of ZZ Ceti stars with fully evolutionary white dwarf models, I: The impact of tthe uncertainties from prior evolution on the period spectrum

de Gerónimo, Francisco CésarIcon ; Althaus, Leandro GabrielIcon ; Corsico, Alejandro HugoIcon ; Romero, Alejandra DanielaIcon ; Souza Oliveira, Kepler
Fecha de publicación: 02/2017
Editorial: EDP Sciences
Revista: Astronomy and Astrophysics
ISSN: 0004-6361
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

Context. ZZ Ceti stars are pulsating white dwarfs with a carbon-oxygen core build up during the core helium burning and thermally pulsing Asymptotic Giant Branch phases. Through the interpretation of their pulsation periods by means of asteroseismology, details about their origin and evolution can be inferred. The whole pulsation spectrum exhibited by ZZ Ceti stars strongly depends on the inner chemical structure. At present, there are several processes affecting the chemical profiles that are still not accurately determined.Aims. We present a study of the impact of the current uncertainties of the white dwarf formation and evolution on the expected pulsation properties of ZZ Ceti stars.Methods. Our analysis is based on a set of carbon-oxygen core white dwarf models with masses 0.548 and 0.837 M⊙ that are derived from full evolutionary computations from the ZAMS to the ZZ Ceti domain. We considered models in which we varied the number of thermal pulses, the amount of overshooting, and the 12C(α,γ)16O reaction rate within their uncertainties.Results. We explore the impact of these major uncertainties in prior evolution on the chemical structure and expected pulsation spectrum. We find that these uncertainties yield significant changes in the g-mode pulsation periods.Conclusions. We conclude that the uncertainties in the white dwarf progenitor evolution should be taken into account in detailed asteroseismological analyses of these pulsating stars.
Palabras clave: Asteroseismology , Evolution of Stars , White Dwarfs , Oscillations
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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-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/41054
DOI: http://dx.doi.org/10.1051/0004-6361/201629806
URL: https://www.aanda.org/articles/aa/abs/2017/03/aa29806-16/aa29806-16.html
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Articulos de INST.DE ASTROFISICA LA PLATA
Citación
de Gerónimo, Francisco César; Althaus, Leandro Gabriel; Corsico, Alejandro Hugo; Romero, Alejandra Daniela; Souza Oliveira, Kepler; Asteroseismology of ZZ Ceti stars with fully evolutionary white dwarf models, I: The impact of tthe uncertainties from prior evolution on the period spectrum; EDP Sciences; Astronomy and Astrophysics; 599; 2-2017; A21
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