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Merges can form supermagnetic stars



According to a new study, most magnetic stars have their origin in the merging of stars.

For relatively massive stars – those greater than 1.5 times the mass of the sun – previous research has shown that about 10% of stars fuse strong magnetic fields which average 100 to 1000 times stronger than those of the sun. Other previous work suggested that fused stars – those resulting from the fusion of two other stars – could generate strong magnetic fields and that 10% of the massive stars might result from fusions.

One reason for the assumption that fused stars are strong Magnetic fields are due to the fact that, as would be expected, when two stars collide, large turbulences are the result. Merged stars inherit such turbulence, and this "turbulent energy is converted into magnetic energy," said the lead author of the study Fabian Schneider an astrophysicist at Heidelberg University in Germany.

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(The magnetic field of a star or planet is driven by the so-called dynamo, which results from the swirling motion of an electrically conductive liquid On Earth, this liquid is molten iron in the nucleus of the planet, in the case of stars, this is plasma or clouds of electrically charged particles.) To see if fused stars could actually become powerful Magnetic fields After Scheider and his colleagues melt after their parent stars merge They developed 3D computer simulations of mergers between pairs of massive stars that were non-magnetic and tracked how the results evolved over time. In particular, they analyzed fusions that were expected to result in fused stars, with each fused pair having 17 times the mass of the sun, similar to the magnetic star Tau Scorpii which in the constellation is about 470 light-years from the Earth is Scorpius.

The simulations revealed that "after fused stars regained equilibrium after the tumult of the fusions causing them," they actually generate strong magnetic fields, "Schneider told Space.com.

The Researchers Also Found The infusions of fuel, which blended the stars inherited from their parents, made them look hotter than stars of the same age, making them look younger and bluer. This may explain the strange features of Tau Scorpii, a so-called " Blue Straggler ", a strange star whose age seems to be younger than that of its old neighbors, although all the stars in the region are thought to be simultaneously formed. In particular, blue stragglers appear inexplicably hot, young and blue compared to their brothers, and earlier research suggested that blue laggards are sometimes due to one star swallowing another, as is the case with a merger.

In addition, the researchers suggested their results could shed light on the formation of magnetars, the strongest magnets in the cosmos. Magnetars are a rare type of neutron star . (A neutron star is the nucleus of a massive star that engulfed all of its fuel, collapsed under its own weight, and then exploded as a supernova.) Magnetars can have magnetic fields as large as those of Earth up to about 5,000 trillion times ,

The scientists found that a massive magnetic star that had collapsed into a neutron star in the computer simulations of the new study could have a magnetic field as strong as that of a magnetar. They also found that previous investigations suggested about 15% of the type of supernova producing neutron stars that produce a magnetar. This is in line with the fact that 10% of all massive stars have magnetic fields, thus underpinning the proposal of the new study that magnetars may arise from the collapse of massive magnetic stars. English: emagazine.credit-suisse.com/app/art…1007 & lang = en. German: emagazine.credit-suisse.com/app/art…1007 & lang = DE How to explain why some neutron stars have such incredibly strong magnetic fields, supposedly the strongest across the universe, "said Schneider. They also produce magnetic stars, Schneider said. They also want to see how long the magnetic fields of these fused stars actually last.

"We still can not say how long the field will last," said Schneider. "Right now, everything is pointing in the direction that it will take for the lifetime of the star and maybe even longer, solving this problem is a challenge, but hopefully we will find a way."

The scientists detailed their results online October 9 in the journal Nature. Follow Charles Q. Choi on Twitter @cqchoi . Follow us on Twitter @SpaceTotcom and Facebook .


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