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Centro de Astrofísica da Universidade do Porto

Pulsational properties of a set of Kepler pure γ Doradus candidates

A. Grigahcène, J. Pascual, J. Gutiérrez-Soto, K. Uytterhoeven, L. A. Balona, R. A. Garcia, S. Martín-Ruiz, E. Niemczura, A. Moya Bedón, L. Fox-Machado, J.-C. Suárez, H. Lehmann, O. L. Creevey, S. Benatti, A. García Hernández, P. J. Amado, M. J. P. F. G. Monteiro, J. A. Guzik

Abstract.
γ Doradus pulsators show high-order gravity modes with periods ranging from 0.3 to 3 days. Ground based observations of these stars are often complicated by the aliasing of one day and the very low level of amplitudes. However, the Kepler space mission, providing high-quality light curves of unprecedented length and accuracy, promises a breakthrough in the study of such variable stars. Not only do the Kepler data solve aliasing and photometric stability problems encountered in ground-based photometric campaigns, the wealth of detected frequencies found in γ Dor stars will also help to overcome difficulties with mode identification, as asymptotic analysis techniques can be applied. We present the preliminary results of a set of pure γ Dor candidates. We aim at studying their pulsational characteristics, mainly their frequency range and amplitudes, taking into account their positions in the HR diagram.

Third Kepler Asteroseismology Workshop: 'Kepler Asteroseismology in Action'
Aarhus, Denmark
June 2010

Type: Poster

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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