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24 April 2024

» arxiv » 1010.4329

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A precise asteroseismic age and radius for the evolved Sun-like star KIC 11026764
T.S. Metcalfe ; M.J.P.F.G. Monteiro ; M.J. Thompson ; J. Molenda-Zakowicz ; T. Appourchaux ; W.J. Chaplin ; G. Dogan ; P. Eggenberger ; T.R. Bedding ; H.Bruntt ; O.L. Creevey ; P.-O. Quirion ; D. Stello ; A. Bonanno ; V. Silva Aguirre ; S. Basu ; L. Esch ; N. Gai ; M.P. Di Mauro ; A.G. Kosovichev ; I.N. Kitiashvili ; J.C. Suarez ; A. Moya ; L. Piau ; R.A. Garcia ; J.P. Marques ; A. Frasca ; K. Biazzo ; S.G. Sousa ; S. Dreizler ; M. Bazot ; C. Karoff ; S. Frandsen ; P.A. Wilson ; T.M. Brown ; J. Christensen-Dalsgaard ; R.L. Gilliland ; H. Kjeldsen ; T.L. Campante ; S.T. Fletcher ; R. Handberg ; C. Regulo ; D. Salabert ; J. Schou ; G.A. Verner ; J. Ballot ; A.-M. Broomhall ; Y. Elsworth ; S. Hekker ; D. Huber ; S. Mathur ; R. New ; I.W. Roxburgh ; K.H. Sato ; T.R. White ; W.J. Borucki ; D.G. Koch ; J.M. Jenkins ;
Date:	21 Oct 2010
Abstract:	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. (2010) 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.
Source:	arXiv, 1010.4329
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