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Centro de Astrofísica da Universidade do Porto

Ensemble Asteroseismology of Solar-Type Stars with the NASA Kepler Mission

W. J. Chaplin, H. Kjeldsen, J. Christensen-Dalsgaard, S. Basu, A. Miglio, T. Appourchaux, T. R. Bedding, Y. Elsworth, R. A. García, R. L. Gilliland, L. Girardi, G. Houdek, C. Karoff, S. D. Kawaler, T. S. Metcalfe, J. Molenda-Żakowicz, M. J. P. F. G. Monteiro, M. J. Thompson, G. A. Verner, J. Ballot, A. Bonanno, I. M. Brandão, A.-M. Broomhall, H. Bruntt, T. L. Campante, E. Corsaro, O. L. Creevey, G. Doǧan, L. Esch, N. Gai, P. Gaulme, S. J. Hale, R. Handberg, S. Hekker, D. Huber, A. Jiménez, S. Mathur, A. Mazumdar, B. Mosser, R. New, M. H. Pinsonneault, D. Pricopi, P.-O. Quirion, C. Régulo, D. Salabert, A. M. Serenelli, V. Silva Aguirre, S. G. Sousa, D. Stello, I. R. Stevens, M. D. Suran, K. Uytterhoeven, T. R. White, W. J. Borucki, T. M. Brown, J. M. Jenkins, K. Kinemuchi, J. Van Cleve, T. C. Klaus

Abstract
In addition to its search for extrasolar planets, the NASA Kepler mission provides exquisite data on stellar oscillations. We report the detections of oscillations in 500 solar-type stars in the Kepler field of view, an ensemble that is large enough to allow statistical studies of intrinsic stellar properties (such as mass, radius, and age) and to test theories of stellar evolution. We find that the distribution of observed masses of these stars shows intriguing differences to predictions from models of synthetic stellar populations in the Galaxy.

Science
Volume 332, Page 213
April 2011

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Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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