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Strong magnetic fields very common in stars
Using a recently developed technique to detect magnetic fields inside stars, a team of astronomers has discovered that these are very common in stars. Previously, only a very small percentage of stars were known to have strong magnetic fields.
New York: Using a recently developed technique to detect magnetic fields inside stars, a team of astronomers has discovered that these are very common in stars. Previously, only a very small percentage of stars were known to have strong magnetic fields. Therefore, current scientific models of how stars evolve do not include magnetic fields as a fundamental component.
Until now, astronomers have been unable to detect these magnetic fields because such fields hide deep in the stellar interior, out of sight from conventional observation methods that measure only the surface properties of stars.
The research team turned to asteroseismology, a technique that probes beyond the stellar surface, to determine the presence of very strong magnetic fields near the stellar core.
Most stars like the sun are subject to continuous oscillations. The researchers used very precise data from NASA's Kepler space telescope to measure tiny brightness variations caused by the ringing sound inside thousands of stars.
They found that certain oscillation frequencies were missing in 60 per cent of the stars due to suppression by strong magnetic fields in the stellar cores.
