Asteroseismology of the Kepler V777 Herculis variable white dwarf with fully evolutionary models

Context. DBV stars are pulsating white dwarfs with atmospheres rich in He. Asteroseismology of DBV stars can provide valuable clues about the origin, structure and evolution of hydrogen-deficient white dwarfs, and may allow to study neutrino and axion physics. Recently, a new DBV star, KIC 8626021,...

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Detalles Bibliográficos
Autores principales:	Córsico, Alejandro Hugo, Althaus, Leandro Gabriel, Miller Bertolami, Marcelo Miguel, Bischoff-Kim, A.
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2012
Materias:	Ciencias Astronómicas Asteroseismology Stars: evolution Stars: interiors Stars: oscillations White dwarfs
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/84116
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-84116
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 Asteroseismology Stars: evolution Stars: interiors Stars: oscillations White dwarfs
spellingShingle	Ciencias Astronómicas Asteroseismology Stars: evolution Stars: interiors Stars: oscillations White dwarfs Córsico, Alejandro Hugo Althaus, Leandro Gabriel Miller Bertolami, Marcelo Miguel Bischoff-Kim, A. Asteroseismology of the Kepler V777 Herculis variable white dwarf with fully evolutionary models
topic_facet	Ciencias Astronómicas Asteroseismology Stars: evolution Stars: interiors Stars: oscillations White dwarfs
description	Context. DBV stars are pulsating white dwarfs with atmospheres rich in He. Asteroseismology of DBV stars can provide valuable clues about the origin, structure and evolution of hydrogen-deficient white dwarfs, and may allow to study neutrino and axion physics. Recently, a new DBV star, KIC 8626021, has been discovered in the field of the Kepler spacecraft. It is expected that further monitoring of this star in the next years will enable astronomers to determine its detailed asteroseismic profile. Aims. We perform an asteroseismological analysis of KIC 8626021 on the basis of fully evolutionary DB white-dwarf models. Methods. We employ a complete set of evolutionary DB white-dwarf structures covering a wide range of effective temperatures and stellar masses. They have been obtained on the basis of a complete treatment of the evolutionary history of progenitors stars. We compute g-mode adiabatic pulsation periods for this set of models and compare them with the pulsation properties exhibited by KIC 8626021. Results. On the basis of the mean period spacing of the star, we found that the stellar mass should be substantially larger than spectroscopy indicates. From period-to-period fits we found an asteroseismological model characterized by an effective temperature much higher than the spectroscopic estimate. Conclusions. In agreement with a recent asteroseismological analysis of this star by other authors, we conclude that KIC 8626021 is located near the blue edge of the DBV instability strip, contrarily to spectroscopic predictions. We also conclude that the mass of KIC 8626021 should be substantially larger than thought.
format	Articulo Articulo
author	Córsico, Alejandro Hugo Althaus, Leandro Gabriel Miller Bertolami, Marcelo Miguel Bischoff-Kim, A.
author_facet	Córsico, Alejandro Hugo Althaus, Leandro Gabriel Miller Bertolami, Marcelo Miguel Bischoff-Kim, A.
author_sort	Córsico, Alejandro Hugo
title	Asteroseismology of the Kepler V777 Herculis variable white dwarf with fully evolutionary models
title_short	Asteroseismology of the Kepler V777 Herculis variable white dwarf with fully evolutionary models
title_full	Asteroseismology of the Kepler V777 Herculis variable white dwarf with fully evolutionary models
title_fullStr	Asteroseismology of the Kepler V777 Herculis variable white dwarf with fully evolutionary models
title_full_unstemmed	Asteroseismology of the Kepler V777 Herculis variable white dwarf with fully evolutionary models
title_sort	asteroseismology of the kepler v777 herculis variable white dwarf with fully evolutionary models
publishDate	2012
url	http://sedici.unlp.edu.ar/handle/10915/84116
work_keys_str_mv	AT corsicoalejandrohugo asteroseismologyofthekeplerv777herculisvariablewhitedwarfwithfullyevolutionarymodels AT althausleandrogabriel asteroseismologyofthekeplerv777herculisvariablewhitedwarfwithfullyevolutionarymodels AT millerbertolamimarcelomiguel asteroseismologyofthekeplerv777herculisvariablewhitedwarfwithfullyevolutionarymodels AT bischoffkima asteroseismologyofthekeplerv777herculisvariablewhitedwarfwithfullyevolutionarymodels
bdutipo_str	Repositorios
_version_	1764820488392015872

Asteroseismology of the Kepler V777 Herculis variable white dwarf with fully evolutionary models

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