Amplification of azimuthal modes with odd wave numbers during dynamical bar-mode growth in rotating stars - AstrophysicsReportar como inadecuado




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Abstract: Nonlinear growth of the bar-mode deformation is studied for a differentiallyrotating star with supercritical rotational energy. In particular, the growthmechanism of some azimuthal modes with odd wave numbers is examined bycomparing a simplified mathematical model with a realistic simulation. Modecoupling to even modes, i.e., the bar mode and higher harmonics, significantlyenhances the amplitudes of odd modes, unless they are exactly zero initially.Therefore, other modes which are not axially symmetric cannot be neglected atlate times in the growth of the unstable bar-mode even when starting from analmost axially symmetric state.



Autor: Yasufumi Kojima, Motoyuki Saijo

Fuente: https://arxiv.org/







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