منابع مشابه
Resonance accretion on the magnetized rotating neutron star
It is suggested that the accretion disk excites the eigen modes of Alfven oscillations of the magnetic field tubes the ends of which are frozen to the neutron star surface. The resonance takes place when the eigen Alfven frequency coincides with the difference of the Keplerian disk rotation frequency and the frequency of rotation of a neutron star. This model explains the two narrow lines of QP...
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Analytical expressions are obtained for the stress field in a sphere that has grown by accretion while rotating about an axis at a speed which may vary during the accretion process. It is assumed that accretion occurs by the adherence of infinitesimal particles that are stress free at the instant of attachment and that the material of the sphere behaves elastically once it has accreted. The res...
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We have recently realised that intermediate polars accrete in a range of modes. While accretion is predominantly through an accretion disc, in some systems the accretion stream overrows the disc and interacts with the magnetic eld directly. In RX 1712{24, discless accretion dominates. I review the current status of these observations, concentrating on the information from the X-ray lightcurves.
متن کاملMagnetic activity in accretion disc boundary layers
We use three dimensional magnetohydrodynamic simulations to study the structure of the boundary layer between an accretion disc and a non-rotating, unmagnetized star. Under the assumption that cooling is efficient, we obtain a narrow but highly variable transition region in which the radial velocity is only a small fraction of the sound speed. A large fraction of the energy dissipation occurs i...
متن کاملSecular instability in quasi-viscous disc accretion
A first-order correction in the α-viscosity parameter of Shakura & Sunyaev has been introduced in the standard inviscid and thin accretion disc. A linearised time-dependent perturbative study of the stationary solutions of this “quasi-viscous” disc leads to the development of a secular instability on large spatial scales. This qualitative feature is equally manifest for two different types of p...
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ژورنال
عنوان ژورنال: Astrophysics and Space Science
سال: 2019
ISSN: 0004-640X,1572-946X
DOI: 10.1007/s10509-019-3605-1