A PRECISE ASTEROSEISMIC AGE AND RADIUS FOR THE EVOLVED SUN-LIKE STAR KIC 11026764

Journal Article · Wed Nov 10 00:00:00 EST 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/723/2/1583· OSTI ID:21471245

Metcalfe, T S ^[1]; Thompson, M J ^[2]; Molenda-Zakowicz, J ^[3]; Appourchaux, T ^[4]; Chaplin, W J ^[5]; Dogan, G ^[6]; Eggenberger, P ^[7]; Bedding, T R; Stello, D ^[8]; Bruntt, H ^[9]; Creevey, O L ^[10]; Quirion, P -O ^[11]; Bonanno, A ^[12]; Silva Aguirre, V ^[13]; Basu, S; Esch, L; Gai, N ^[14]; Di Mauro, M P ^[15]; Kosovichev, A G ^[16]

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1. High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307 (United States)
2. School of Mathematics and Statistics, University of Sheffield, Hounsfield Road, Sheffield S3 7RH (United Kingdom)
3. Astronomical Institute, University of Wroclaw, ul. Kopernika 11, 51-622 Wroclaw (Poland)
4. Institut d'Astrophysique Spatiale, Universite Paris XI-CNRS (UMR8617), Batiment 121, 91405 Orsay Cedex (France)
5. School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT (United Kingdom)
6. Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)
7. Geneva Observatory, University of Geneva, Maillettes 51, 1290 Sauverny (Switzerland)
8. Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006 (Australia)
9. Observatoire de Paris, 5 place Jules Janssen, 92190 Meudon Principal Cedex (France)
10. Instituto de Astrofisica de Canarias, E-38200 La Laguna (Spain)
11. Canadian Space Agency, 6767 Boulevard de l'Aeroport, Saint-Hubert, QC, J3Y 8Y9 (Canada)
12. INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania (Italy)
13. Max-Planck-Institute for Astrophysics, Karl Schwarzschild Str. 1, Garching, D-85741 (Germany)
14. Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States)
15. INAF-IASF Roma, Istituto di Astrofisica Spaziale e Fisica Cosmica, via del Fosso del Cavaliere 100, 00133 Roma (Italy)
16. HEPL, Stanford University, Stanford, CA 94305-4085 (United States)

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.

• OSTI ID: 21471245
• Journal Information: Astrophysical Journal, Vol. 723, Issue 2; Other Information: DOI: 10.1088/0004-637X/723/2/1583; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
OSCILLATIONS
PHOTOMETRY
PLANETS
STAR EVOLUTION
SUN
EVOLUTION
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STARS