Probing the structure of Kepler ZZ Ceti Stars with full evolutionary models-based asteroseismology

 

Autores
Romero, Alejandra D.; Corsico, Alejandro Hugo; Castanheira, B. G.; de Gerónimo, Francisco César; Kepler, S. O.; Koester, D.; Kawka, A.; Althaus, Leandro Gabriel; Hermes, J. J.; Bonato, C.; Gianninas, A.
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2017
País
Argentina
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio
CONICET Digital (CONICET)
Descripción
We present an asteroseismological analysis of four ZZ Ceti stars observed with the Kepler spacecraft: GD 1212, SDSS J113655.17+040952.6, KIC 11911480, and KIC 4552982, based on a grid of full evolutionary models of DA white dwarf (WD) stars. We employ a grid of carbon-oxygen core models, characterized by a detailed and consistent chemical inner profile for the core and the envelope. In addition to the observed periods, we take into account other information from the observational data, such as amplitudes, rotational splittings, and period spacing, as well as photometry and spectroscopy. For each star, we present an asteroseismological model that closely reproduces their observed properties. The asteroseismological stellar mass and effective temperature of the target stars are (0.632 ± 0.027 M, 10737 ± 73 K) for GD 1212, (0.745 ± 0.007 M, 11110 ± 69 K) for KIC 4552982, (05480 ± 0.01 M, 12,721 ± 228 K) for KIC11911480, and (0.570 ± 0.01 M, 12,060 ± 300 K) for SDSS J113655.17+040952.6. In general, the asteroseismological values are in good agreement with the spectroscopy. For KIC 11911480 and SDSS J113655.17+040952.6 we derive a similar seismological mass, but the hydrogen envelope is an order of magnitude thinner for SDSS J113655.17+040952.6, which is part of a binary system and went through a common envelope phase.
Idioma
inglés
OAI Identifier
oai:ri.conicet.gov.ar:11336/41119
Enlace del recurso
http://hdl.handle.net/11336/41119
Nivel de acceso
Acceso abierto
Materia
ZZ Ceti stars (estrella)
Variable stars
White dwarfs
Astronomía
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS