On a mechanism for enhancing magnetic activity in tidally interacting binaries

Details On a mechanism for enhancing magnetic activity in tidally interacting binaries On a mechanism for enhancing magnetic activity in tidally interacting binaries

2002-10-10

arxiv.org/abs/astro-ph/0210222v1

Astrophys.J. 579 (2002) 810-816; Erratum-ibid. 591 (2003) 498

Astronomy and Astrophysics

Astrophysics

Accepted in ApJ

Scientific paper

10.1086/342269

We suggest a mechanism for enhancing magnetic activity in tidally interacting binaries. We suppose that the deviation of the primary star from spherical symmetry due to the tidal influence of the companion leads to stellar pulsation in its fundamental mode. It is shown that stellar radial pulsation amplifies torsional Alfv{\'e}n waves in a dipole-like magnetic field, buried in the interior, according to the recently proposed swing wave-wave interaction (Zaqarashvili 2001). Then amplified Alfv{\'e}n waves lead to the onset of large-scale torsional oscillations, and magnetic flux tubes arising towards the surface owing to magnetic buoyancy diffuse into the atmosphere producing enhanced chromospheric and coronal emission.

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