Strong magnetic fields discovered in majority of stars
If you’re wondering why this is news, read on – it has taken at least some scientists by surprise, reports phys.org.
No magnetism without electricity
Strong magnetic fields discovered in majority of stars—Finding to impact understanding of stellar evolution
An international group of astronomers led by the University of Sydney has discovered strong magnetic fields are common in stars, not rare as previously thought, which will dramatically impact our understanding of how stars evolve.
Using data from NASA’s Kepler mission, the team found that stars only slightly more massive than the Sun have internal magnetic fields up to 10 million times that of the Earth, with important implications for evolution and the ultimate fate of stars. “This is tremendously exciting, and totally unexpected,” said lead researcher, astrophysicist Associate Professor Dennis Stello from the University of Sydney.”
Because only 5 percent of stars were previously thought to host strong magnetic fields, current models of how stars evolve lack magnetic fields as a fundamental ingredient,” Associate Professor Stello said. “Such fields have simply been regarded insignificant for our general understanding of stellar evolution. Our result clearly shows this assumption needs to be revisited.”
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The results will enable scientists to test more directly theories of how magnetic fields form and evolve—a process known as magnetic dynamos—inside stars. This could potentially lead to a better general understanding of magnetic dynamos, including the dynamo controlling the Sun’s 22-year magnetic cycle, which is known to affect communication systems and cloud cover on Earth.
“Now it is time for the theoreticians to investigate why these magnetic fields are so common,” Associate Professor Stello concluded.
Full report with graphics: Strong magnetic fields discovered in majority of stars
Source: https://tallbloke.wordpress.com/2016/01/04/strong-magnetic-fields-discovered-in-majority-of-stars/
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