SIMBAD references

2003A&A...412L..33G - Astronomy and Astrophysics, volume 412, L33-36 (2003/12-3)

Spot-like structures of neutron star surface magnetic fields.


Abstract (from CDS):

There is growing evidence, based on both X-ray and radio observations of isolated neutron stars, that besides the large-scale (dipolar) magnetic field, which determines the pulsar spin-down behaviour, small-scale poloidal field components are present, which have surface strengths one to two orders of magnitude larger than the dipolar component. We argue in this paper that the Hall-effect can be an efficient process in producing such small-scale field structures just above the neutron star surface. It is shown that due to a Hall-drift induced instability, poloidal magnetic field structures can be generated from strong subsurface toroidal fields, which are the result of either a dynamo or a thermoelectric instability acting at early times of a neutron star's life. The geometrical structure of these small-scale surface anomalies of the magnetic field resembles that of some types of ``star-spots''. The magnetic field strength and the length-scales are comparable with values that can be derived from various observations.

Abstract Copyright:

Journal keyword(s): stars: neutron - stars: pulsars - stars: magnetic fields

Simbad objects: 3

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