Accretion on to Strange Matter Pulsars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion, Accretion Discs - Dense Matter - Equation Of State - Stars: Neutron - Pulsars: General

Scientific paper

We study the effects of the accretion of normal matter on to strange-matter pulsar models. It is assumed that, because of the high strangeness barrier, normal matter is inert in contact with Qα matter. For this reason, normal matter accretion is able to form a thick outer layer with densities far above neutron drip. Accretion can make the superfluid quark-alpha Qα layer disappear by solidification but, for the same reason, a superfluid neutron layer is formed. The fractional moment of inertia of the latter is large enough to fulfil the vortex-creep glitch model requirements.
The high rotational stability of millisecond pulsars is discussed in the framework of the strange-matter hypothesis. If the validity of the vortex-creep model is assumed, it is shown that, for the case of accreted strange-pulsar models, this stability cannot be interpreted as due to the solidification of the superfluid Qα layer. Nevertheless, `standard' homogeneous strange stars remain as interesting candidates for the internal composition of these objects.
The main conclusions of this work should be unaltered if Qα is not preferred to strange matter at low pressures, but some other strange complex plays a similar role.

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