期刊
ASTROPHYSICAL JOURNAL
卷 723, 期 2, 页码 1583-1598出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/723/2/1583
关键词
stars: evolution; stars: individual (KIC 11026764); stars: interiors; stars: oscillations
资金
- NASA's Science Mission Directorate
- NASA [NNX09AE59G]
- U.S. National Science Foundation
- INSU/CNRS
- Danish Natural Science Research Council
- MNiSW [N203 014 31/2650]
- FCT [TDC/CTE-AST/098754/2008]
- FEDER, Portugal
- Australian Research Council
- UK Science and Facilities Technology Council
- European Commission
- FCT (Portugal) [SFRH/BPD/47611/2008, PTDC/CTE-AST/66181/2006]
- NASA [120018, NNX09AE59G] Funding Source: Federal RePORTER
- STFC [ST/F002041/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002041/1] Funding Source: researchfish
- UK Space Agency [PP/E001793/1] Funding Source: researchfish
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.
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