Autor(es):
Metcalfe, TS ; Monteiro, MJPFG ; Thompson, MJ ; Molenda Zakowicz, J ; Appourchaux, T ; Chaplin, WJ ; Dogan, G ; Eggenberger, P ; Bedding, TR ; Bruntt, H ; Creevey, OL ; O Quirion ; Stello, D ; Bonanno, A ; Silva S Aguirre ; Basu, S ; Esch, L ; Gai, N ; di Mauro, MP ; Kosovichev, AG ; Kitiashvili, IN ; Suarez, JC ; Moya, A ; Piau, L ; Garcia, RA ; Marques, JP ; Frasca, A ; Biazzo, K ; Sousa, SG ; Dreizler, S ; Bazot, M ; Karoff, C ; Frandsen, S ; Wilson, PA ; Brown, TM ; Christensen Dalsgaard, J ; Gilliland, RL ; Kjeldsen, H ; Campante, TL ; Fletcher, ST ; Handberg, R ; Regulo, C ; Salabert, D ; Schou, J ; Verner, GA ; Ballot, J ; M Broomhall ; Elsworth, Y ; Hekker, S ; Huber, D ; Mathur, S ; New, R ; Roxburgh, IW ; Sato, KH ; White, TR ; Borucki, WJ ; Koch, DG ; Jenkins, JM
Data: 2010
Origem: Repositório Aberto da Universidade do Porto
Assunto(s): Astronomia, Física; Astronomy, Physical sciences
Descrição
The primary science goal of the Kepler Mission is to provide a census of exoplanets in the solar neighborhood, including the identification and characterization of habitable Earth-like planets. The asteroseismic capabilities of the mission are being used to determine precise radii and ages for the target stars from their solar-like oscillations. Chaplin et al. published observations of three bright G-type stars, which were monitored during the first 33.5 days of science operations. One of these stars, the subgiant KIC 11026764, exhibits a characteristic pattern of oscillation frequencies suggesting that it has evolved significantly. We have derived asteroseismic estimates of the properties of KIC 11026764 from Kepler photometry combined with ground-based spectroscopic data. We present the results of detailed modeling for this star, employing a variety of independent codes and analyses that attempt to match the asteroseismic and spectroscopic constraints simultaneously. We determine both the radius and the age of KIC 11026764 with a precision near 1%, and an accuracy near 2% for the radius and 15% for the age. Continued observations of this star promise to reveal additional oscillation frequencies that will further improve the determination of its fundamental properties.
