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Centro de Astrofísica da Universidade do Porto

Periodicities Within the Frequency Spectra of δ Scuti Stars Observed by Kepler

A. García Hernández, J. Pascual-Granado, A. Grigahcène, K. Uytterhoeven, A. Moya Bedón, R. Garrido, J.-C. Suárez, J. Gutiérrez-Soto, S. Martín-Ruiz

Abstract
We showed in previous works that a periodic pattern could be found in the frequency set of δ Sct stars observed by CoRoT. We related that pattern with a value of the large separation. However, are these stars particular cases? We present here preliminary results of our work aimed at answering this and related questions. We looked for periodicities in the frequency spectrum of a sub-sample of 153 δ Sct pulsators observed by Kepler. We have determined that ∼ 50% of the sub-sample shows a clear pattern. Moreover, we found three objects with almost the same KIC physical parameters showing the same value of the pattern. We suggest that the pattern is a sign of a large-separation-like structure.

Stellar Pulsations
Impact of New Instrumentation and New Insights
(Eds.) J.C. Suárez, R. Garrido, L. A. Balona, J. Christensen-Dalsgaard

Springer-Verlag Berlin Heidelberg
Vol. 31, Page 61
2013

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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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