Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...300..158v&link_type=abstract
Astronomy and Astrophysics, v.300, p.158
Astronomy and Astrophysics
Astrophysics
2
Stars: Binaries: Close, Stars: Magnetic Field
Scientific paper
We have simulated the interaction of magnetic fields in binary stars. We use the vacuum dipole approximation and show that if the field of one of the stars in a binary is much stronger than the field in the other star, then the entire magnetosphere of the magnetically weaker star will be enclosed or enveloped by the star with the stronger field. Under such a condition, any charged particle released from the surface of the weaker star will be channeled onto the magnetically stronger star. This is interesting since, if the magnetically weaker star has a strong stellar wind, an accretion type hot spot can occur in a binary even when the stars do not fill their Roche Lobe. The hotspot would fall on the magnetic poles of the receiving star irrespective of their relative periods of rotation, size, stage of evolution etc.. We discuss the minimum value of the ratio of the fields of the two stars as a function of the distance between them for which the magnetosphere of one star will be enclosed by its binary companion. We then simulate an active region on the surface of one of the two stars of otherwise comparable fields by introducing a third dipole in the system. We simulate the rotation of one star by changing the location of the third dipole and show that under such a condition the field from one star can vary from being completely enclosed to completely excluded over single rotation period giving a large variation in their properties over a small interval of time.
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