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Deciphering the period spacing pattern in the oscillation spectrum of the SPB star KIC 7760680
Wojciech Szewczuk (Astronomical Institute of the Wroclaw University), Jadwiga Daszynska-Daszkiewicz (Astronomical Institute of the Wroclaw Uniwersity), Przemyslaw Walczak (Astronomical Institute of the Wroclaw Uniwersity)
KIC 7760680 is the Slowly Pulsating B-type star identified in the Kepler photometry in which Papics et al. (2015) found a series of 36 frequencies quasi-equally spaced in period. The star rotates at a rate of at least 62 km s-1. Based on the zero-rotation asymptotic theory and slope of this series, the authors attributed these frequency peaks to prograde dipole gravity modes of high orders. Taking into account in an appropriate way the effects of rotation, we show that the slope of the period spacing series can be explained also by other high-order g modes. Our seismic modelling is based on evolutionary calculations with MESA code and on the traditional approximation for including the effects of the Coriolis force on g-mode pulsations. Additionally, the effect of various mixing processes (e.g., convective overshooting, diffusion, rotationally induced mixing) are investigated.