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Ahmed Qureshi et al 2018 ApJ 864 65

Observations of a bifurcation in the stellar spin-period in young clusters support calculations showing that planet consumption by a star will spin up the star; the spun-up star will later spin down due to magnetic braking.

Jie Jiang et al 2018 ApJ 863 159

A scheme is presented to investigate the predictability of the solar cycle over one cycle; when a cycle has been ongoing for >3 years, the sunspot group emergence can be predicted during the rest time of the cycle.

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