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Kepler observation of HD 176465, a binary system with overlapping pulsation frequencies
Othman Benomar (New York University Abu Dhabi), Tim White (SAC, Aarhus University), Victor Silva Aguirre (SAC, Aarhus University), Warrick Ball (Institut für Astrophysik, Georg-August-Universität Göttingen), et al.
Binary stars systems are crucial to better understand the physics of stars, because they might share a common history, enabling us to assume that they have the same age and composition. Furthermore, using the kepler laws, the orbital parameters could provide tight constraints on their mass ratio. With the recent advent of asteroseismology it is also now possible to look for pulsating multiple stars, providing a new insight on their internal structure and dynamics. Yet, while 60% of stars are thought to be part of a multiple system, only a handful were detected with more than one component showing pulsations. I will present one of these rare cases, HD 176465. It is composed of two bright stars situated at 49.6 +/- 1.8 pc, that show pulsations at a similar frequency numax~3500 muHz. I will first describe our seismic analysis of the system, then discuss the orbits of the stars, their rotations and fundamental physical properties (masses, radii, ages, compositions), derived using various stellar models.