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The primary science goal of the Kepler Mission is to provide a census ofexoplanets in the solar neighborhood, including the identification andcharacterization of habitable Earth-like planets. The asteroseismiccapabilities of the mission are being used to determine precise radii and agesfor the target stars from their solar-like oscillations. Chaplin et al. (2010)published observations of three bright G-type stars, which were monitoredduring the first 33.5 days of science operations. One of these stars, thesubgiant KIC 11026764, exhibits a characteristic pattern of oscillationfrequencies suggesting that it has evolved significantly. We have derivedasteroseismic estimates of the properties of KIC 11026764 from Keplerphotometry combined with ground-based spectroscopic data. We present theresults of detailed modeling for this star, employing a variety of independentcodes and analyses that attempt to match the asteroseismic and spectroscopicconstraints simultaneously. We determine both the radius and the age of KIC11026764 with a precision near 1%, and an accuracy near 2% for the radius and15% for the age. Continued observations of this star promise to revealadditional oscillation frequencies that will further improve the determinationof its fundamental properties.

A precise asteroseismic age and radius for the evolved Sun-like star KIC 11026764