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Centro de Astrofísica da Universidade do Porto

KIC 86677585: Possibly the first Ap star with roAp and γ Dor pulsations.

I. M. Brandão, L. A. Balona, M. S. Cunha, D. W. Kurtz, M. Gruberbauer, H. Saio, R. Østensen, V. G. Elkin, Kepler working group #5

Abstract.
The A5p star KIC8677585 was observed during the Kepler 10-d commissioning run with the 1-min time resolution. The star shows several oscillation frequencies in the range typical of roAp pulsators, as well as a single frequency in the range typical of γ Dor stars. If confirmed, the combination of these two types of pulsations, never seen before in other roAp stars, has potential to provide unprecedented information regarding the internal structure of magnetic peculiar stars.
From the analysis of the 10 days of Kepler data we determined two possible ranges for the large frequency separation. Combining that with fundamental parameters determined from a spectrum acquired with the instrument HERMES at the Mercator Telescope on La Palma, a first model of the Star was made. In this talk we will show the results of that modelling and discuss how additional seismic and non-seismic data on this star are necessary to pin down its mass and evolution state, and to model the main properties of its interior.

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

Type: Oral comunication

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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