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Centro de Astrofísica da Universidade do Porto

The First Evidence for Multiple Pulsation Axes: A New roAp Star in the Kepler Field, KIC 10195926

D. W. Kurtz, M. S. Cunha, H. Saio, L. Bigot, L. A. Balona, V. G. Elkin, H. Shibahashi, I. M. Brandão, K. Uytterhoeven, S. Frandsen, S. Frimann, A. Hatzes, T. Lüftinger, M. Gruberbauer, H. Kjeldsen, J. Christensen-Dalsgaard, S. D. Kawaler

Abstract
This conference talk introduced the characteristics of the rapidly oscillating Ap stars, then discussed a new rapidly oscillating Ap star discovered and published by Working Group 5 of the Kepler Asteroseismic Science Consortium, KIC 10195926. This star shows two pulsation modes with periods that are amongst the longest known for roAp stars at 17.1 min and 18.1 min, indicating that the star is near the terminal-age main-sequence. The principal pulsation mode is an oblique dipole mode that shows a rotationally split frequency septuplet that provides information on the geometry of the mode. The secondary mode also appears to be a dipole mode with a rotationally split triplet, but within the improved oblique pulsator model these two modes cannot have the same axis of pulsation. This is the first time for any pulsating star that evidence has been found for separate pulsation axes for different modes.

Progress in Solar/Stellar Physics with Helio- and Asteroseismology.
(Eds.) H. Shibahashi, M. Takata, A.E. Lynas-Gray

Astronomical Society of the Pacific
Vol. 462, Page 180
2012

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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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