That was a surprise and showed that these models may be missing something important: magnetism.
stellar symmetry
last year, Gun Lee, now a star seismologist at the University of Leuven, investigated Kepler’s giant. He was looking for mixed-mode signals that recorded the magnetic fields at the cores of red giant stars. “Surprisingly, I actually found several examples of this phenomenon,” he said.
Typically, mixed-mode oscillations in red giant stars occur in an almost rhythmic manner, producing symmetrical signals.Bagnet et al. predicted It was thought that the magnetic field would break that symmetry, but until Lee’s team, no one had been able to make that difficult observation.
Lee and his colleagues discovered a giant trio that exhibited the predicted asymmetry, with each star’s magnetic field to “2,000 times stronger than a typical refrigerator magnet” – strong, but in line with predictions.
But one of the three red giants surprised them. That mixed mode signal was in the opposite direction. “We were a little confused,” he said Sebastian Dehouvel, study author and astrophysicist from Toulouse. Professor de Hubels said the results suggest that the star’s magnetic field is tilted sideways, meaning the technique could potentially determine the field’s orientation, which could be used to refine models of stellar evolution. We believe it is important to update.
A second study led by Deheuvels used mixed-mode stellar seismology to detect the magnetic fields of the cores of 11 red giant stars. Here, the research team investigated how these magnetic fields affect the properties of g-mode. This could provide a way to go beyond red giant stars and detect the magnetic fields of stars that do not exhibit rare asymmetries, de Hoovers noted. But first, “we want to find out how many red giant stars exhibit this behavior and compare them with different scenarios for the formation of these magnetic fields,” de Hubels said.
It’s not just a number
He said that using starquakes to investigate the interior of stars has begun a “renaissance” in stellar evolution. Connie Artsan astrophysicist at the University of Leuven.
The Renaissance has far-reaching implications for our understanding of the stars and our place in the universe. So far, we know the exact age of just one star: the Sun. Scientists determined its exact age based on the chemical composition of the meteorite, which formed a long time ago. Birth of the solar system. For all other stars in the universe, we only know their estimated ages based on their rotations and masses. Adding internal magnetism provides a more accurate way to estimate a star’s age.
