Institutionen för fysik och astronomi

Forskning: A New Level of Magnetic Saturation

2017-07-24

An international group of astronomers including Dr. Oleg Kochukhov from the Department of Physics and Astronomy at Uppsala University has detected unexpectedly strong magnetic fields on the surface of a few fast rotating M dwarf stars.

Red Dwarf. Photo: Mark A.
Garlick, University of Warwick

For a long time it was thought that the dynamo in these stars saturates with a maximum magnetic field strength of about four kilogauss (kG) if a star rotates faster than a particular rotation rate. Using accurate observations and up-to-date models, the researchers discovered that some fully convective M dwarfs generate even stronger fields of up to about seven kG. The results were published in Nature Astronomy on 24 July 2017.

Press release from Georg-August University, Göttingen

D. Shulyak, A. Reiners, A. Engeln, L. Malo, R. Yadav, J. Morin & O. Kochukhov, Strong dipole magnetic fields in fast rotating fully convective stars, Nature Astronomy 1, 0184 (2017), doi:10.1038/s41550-017-0184

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