Journal Article

Magnetospheric activity of bare strange quark stars

J. W. Yu and R. X. Xu

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 414, issue 1, pages 489-494
Published in print June 2011 | ISSN: 0035-8711
Published online June 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18409.x
Magnetospheric activity of bare strange quark stars

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In the model of Ruderman and Sutherland, the binding energy problem is a severe problem when modelling normal neutron stars as pulsars, i.e. both ions (e.g. 5626Fe) and electrons on the normal neutron star surface can be pulled out freely by the unipolar generator induced electric field, so that sparking on the polar cap can hardly occur. This problem can be solved within the partially screened gap (PSG) model for neutron stars. However, in this paper, we study this problem extensively in a model of bare strange quark stars (BSSs). We find that the huge potential barrier built by the electric field in the vacuum gap above the polar cap can usually prevent electrons from streaming into the magnetosphere, unless the electric potential of a pulsar is sufficiently lower than that at the infinite interstellar medium. Other processes, such as the diffusion and thermionic emission of electrons, have also been included here. Our conclusions are as follows. Both positive and negative particles on the surface of a BSS are bound strongly enough to form a vacuum gap above its polar cap as long as the BSS is not charged (or not highly negative charged), and multi-accelerators can occur in the magnetosphere of the BSS. Our results may be helpful to distinguish normal neutron stars and bare quark stars using a pulsar's magnetospheric activities.

Keywords: elementary particles; star: neutron; pulsars: general

Journal Article.  4147 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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