Beneath sure situations, the cores of stars contract. When this occurs, they begin to spin quicker than the exterior layers of the star. Nevertheless, the research of oscillations in stars, asteroseismology, has uncovered an astonishing phenomenon: The cores of such stars really rotate extra slowly than calculations predict. Why is that this so?
Three French scientists from CNRS, INRIA and ENS-PSL have studied this query and report their findings in an article revealed in Science on January 19, 2023. Their numerical simulations, which mannequin plasma move within the deep layers of a star, have proven that the slowing down of the core might be produced by an internal magnetic field. Extra particularly, plasma move can amplify a magnetic field to the purpose the place it generates robust turbulent motions. Such turbulence could additional amplify the magnetic discipline till it causes the star’s core to spin down.
The outcomes obtained with the analysis group’s simulations are additionally in settlement with asteroseismological observations of many stars. As well as, the simulations present that the magnetic discipline can be hidden by the outer layers of the star, which explains why no magnetic discipline of this type has but been measured with present strategies.
Extra info:
Ludovic Petitdemange et al, Spin-down by dynamo motion in simulated radiative stellar layers, Science (2023). DOI: 10.1126/science.abk2169
Quotation:
Why do the cores of stars spin extra slowly than anticipated? (2023, January 30)
retrieved 30 January 2023
from https://phys.org/information/2023-01-cores-stars-slowly.html
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