(ORDO NEWS) — Under certain conditions, the cores of stars shrink. When this happens, the cores begin to spin faster than the outer layers of the star.
However, asteroseismologists have discovered a surprising phenomenon: the cores of such stars actually rotate more slowly than calculations predict. Why is it so?
The researchers used numerical simulations to model the flow of plasma in the deep layers of the star. They found that the slowdown of the nucleus can be caused by an internal magnetic field.
The plasma flow can amplify the magnetic field to such an extent that it generates strong turbulent motions. Such turbulence can further strengthen the magnetic field until it causes the core of the star to slow down.
The results from the research team’s simulations are also consistent with astroseismological observations of many stars.
In addition, simulations show that the magnetic field would be hidden by the outer layers of the star. This explains why this kind of magnetic field has not yet been measured using modern methods.
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