Hydromagnetic rotational braking of magnetic stars

Details Hydromagnetic rotational braking of magnetic stars Hydromagnetic rotational braking of magnetic stars

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..218f&link_type=abstract

Astrophysical Journal, Part 1, vol. 240, Aug. 15, 1980, p. 218-222.

Astronomy and Astrophysics

Astrophysics

4

A Stars, Deceleration, Magnetic Stars, Magnetohydrodynamics, Stellar Magnetic Fields, Stellar Rotation, Angular Momentum, Braking, Dipole Moments, Magnetic Effects, Stellar Envelopes, Torque

Scientific paper

It is suggested that the magnetic Ap stars can be rotationally decelerated to long periods by the braking action of the associated magnetic field on time scales of order 10 to the 7th-10 to the 10th years depending on whether the star's dipole field is aligned perpendicular or parallel to the rotation axis. Rotation includes a toroidal magnetic field in the plasma surrounding a star, and the accompanying magnetic stresses produce a net torque acting to despin the star. These results indicate that it is not necessary to postulate mass loss or mass accretion for this purely hydromagnetic braking effect.

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