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Centro de Astrofísica da Universidade do Porto

CoRoT Measures Solar-Like Oscillations and Granulation in Stars Hotter Than the Sun

E. Michel, A. Baglin, M. Auvergne, C. Catala, R. Samadi, F. Baudin, T. Appourchaux, C. Barban, W. W. Weiss, B. Berthomieu, P. Boumier, M.-A. Dupret, R. Garcia, M. Fridlund, R. Garrido, M.-J. Goupil, H. Kjeldsen, Y. Lebreton, B. Mosser, A. Noels, E. Janot-Pacheco, J. Provost, I. W. Roxburgh, A. Thoul, T. Toutain, D. Tiphène, S. Turck-Chièze, S. Vauclair, G. Vauclair, C. Aerts, G. Alecian, J. Ballot, S. Charpinet, A.-M. Hubert, F. Lignières, P. Mathias, M. J. P. F. G. Monteiro, C. Neiner, E. Poretti, J. R. de Medeiros, I. Ribas, M. Rieutord, T. Roca Cortes, K. Zwintz

Oscillations of the Sun have been used to understand its interior structure. The  extension of similar studies to more distant stars has raised many difficulties despite  the strong efforts of the international community over the past decades. The CoRoT  (Convection Rotation and Planetary Transits) satellite, launched in December 2006, has now measured  oscillations and the stellar granulation signature in three main sequence stars  that are noticeably hotter than the sun. The oscillation amplitudes are about 1.5 times as  large as those in the Sun; the stellar granulation is up to three times as high. The stellar  amplitudes are about 25% below the theoretic values, providing a measurement of the nonadiabaticity of the process ruling the oscillations in the outer layers of the stars.

Volume 322, Page 558
October 2008

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Institute of Astrophysics and Space Sciences

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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