Bibcode
Creevey, O. L.; Doǧan, G.; Frasca, A.; Thygesen, A. O.; Basu, S.; Bhattacharya, J.; Biazzo, K.; Brandão, I. M.; Bruntt, H.; Mazumdar, A.; Niemczura, E.; Shrotriya, T.; Sousa, S. G.; Stello, D.; Subramaniam, A.; Campante, T. L.; Handberg, R.; Mathur, S.; Bedding, T. R.; García, R. A.; Régulo, C.; Salabert, D.; Molenda-Żakowicz, J.; Quirion, P.-O.; White, T. R.; Bonanno, A.; Chaplin, W. J.; Christensen-Dalsgaard, J.; Christiansen, J. L.; Elsworth, Y.; Fanelli, M. N.; Karoff, C.; Kinemuchi, K.; Kjeldsen, H.; Gai, N.; Monteiro, M. J. P. F. G.; Suárez, J. C.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 537, id.A111
Fecha de publicación:
1
2012
Revista
Número de citas
38
Número de citas referidas
32
Descripción
We present an asteroseismic study of the solar-like stars KIC 11395018,
KIC 10273246, KIC 10920273, KIC 10339342, and KIC 11234888 using
short-cadence time series of more than eight months from the Kepler
satellite. For four of these stars, we derive atmospheric parameters
from spectra acquired with the Nordic Optical Telescope. The global
seismic quantities (average largefrequency separation and frequency of
maximum power), combined with the atmospheric parameters, yield the mean
density and surface gravity with precisions of 2% and ~0.03 dex,
respectively. We also determine the radius, mass, and age with
precisions of 2-5%, 7-11%, and ~35%, respectively, using grid-based
analyses. Coupling the stellar parameters with photometric data yields
an asteroseismic distance with a precision better than 10%. A vsini
measurement provides a rotational period-inclination correlation, and
using the rotational periods from the recent literature, we constrain
the stellar inclination for three of the stars. An Li abundance analysis
yields an independent estimate of the age, but this is inconsistent with
the asteroseismically determined age for one of the stars. We assess the
performance of five grid-based analysis methods and find them all to
provide consistent values of the surface gravity to ~0.03 dex when both
atmospheric and seismic constraints are at hand. The different
grid-based analyses all yield fitted values of radius and mass to within
2.4σ, and taking the mean of these results reduces it to
1.5σ. The absence of a metallicity constraint when the average
large frequency separation is measured with a precision of 1% biases the
fitted radius and mass for the stars with non-solar metallicity
(metal-rich KIC 11395018 and metal-poor KIC 10273246), while including a
metallicity constraint reduces the uncertainties in both of these
parameters by almost a factor of two. We found that including the
average small frequency separation improves the determination of the age
only for KIC 11395018 and KIC 11234888, and for the latter this
improvement was due to the lack of strong atmospheric constraints.
Proyectos relacionados
Sismología Solar y Estelar y Búsqueda de Exoplanetas
Los objetivos genéricos de este Proyecto son: 1) el estudio de la estructura y dinámica del interior solar, 2) la extensión de dicho estudio al caso de otras estrellas, 3) la búsqueda y caracterización de planetas extrasolares por métodos fotométricos (principalmente mediante el método de tránsitos) y espectroscópico (variaciones en la velocidad
Savita
Mathur