All-Moscow Seminar of Astrophysicists
(ASA)

The seminar is supported by the grant of Federal Programm "Integration"
annotation of talk
Yuriy M.Toropin (KIAM RAS)
"Spherical Accretion onto a Magnetic Dipole: Numerical Simulations"


Numerical axisymmetric MHD simulations of spherical accretion onto a magnetic dipole were performed. Stationary flow was found in simulation of spherical accretion onto a non-rotating dipole. Dependences of the flow geometry (for example, position of the equatorial Alfven point) and of the integral properties (such as accretion rate) on the system parameters were established. Accretion rate onto dipole is always smaller than accretion rate onto corresponding star without magnetic field. Non-stationary equatorial outflow was found in simulation of accretion onto a fast-rotating dipole. Application of results to the problem of the detectability of isolated old neutron stars (IONS), accreting from interstellar medium, is also discussed.