A study of evoloutionary self-gravitating plytropic β-viscous accretion disks with troidal magnetic field

Ghanbari, J.; Abbassi, Sh.; Al ahmad, N. Jami
March 2011
Iranian Journal of Physics Research;Mar2011, Vol. 11 Issue 1, p1
Academic Journal
In this paper,the effect of troidal magnetic field is studied in standard self-gravitating thin disks with β priscription. By applying the magnetic field, we expect to see different behaviors compared to a non-magnetic field case. The study reveals self-similar solutions for radial infall velocity, rotation velocity, surface density and mass accretion rate. Our results also show that by increasing the magnetic field, the radial velocity and mass accretion rate, at least in the inner regions of the disk,become slow and low, respectively. By contrast, in the outer regions, the azimuthal velocity and surface density become fast and high, respectively.


Related Articles

  • Assembling the Ingredients for a Jet: How Do Large-Scale Magnetic Fields Get There and What Happens When They Do? Rothstein, David M.; Lovelace, Richard V. E. // AIP Conference Proceedings;5/23/2008, Vol. 1010 Issue 1, p35 

    Jets and outflows are observed around a wide variety of accreting objects and seem to be a near-ubiquitous feature of accretion disks. Large-scale magnetic fields are thought to be necessary for jet formation in many systems, but a longstanding puzzle is that the turbulence which is responsible...

  • ACCRETION DISCS, LOW-MASS PROTOSTARS AND PLANETS: PROBING THE IMPACT OF MAGNETIC FIELDS ON STELLAR FORMATION. Donati, J.-F.; Jardine, M. M.; Gregory, S. G.; Bouvier, J.; Dougados, C.; Ménard, F. // EAS Publications Series;2009, Vol. 39, p133 

    Whereas the understanding of most phases of stellar evolution made considerable progress throughout the whole of the twentieth century, stellar formation remained rather enigmatic and poorly constrained by observations until about three decades ago, when major discoveries (e.g., that protostars...

  • Vertically self-gravitating ADAFs in the presence of toroidal magnetic field. Mosallanezhad, A.; Abbassi, S.; Shadmehri, M.; Ghanbari, J. // Astrophysics & Space Science;Feb2012, Vol. 337 Issue 2, p703 

    Force due to the self-gravity of the disc in the vertical direction is considered to study its possible effects on the structure of a magnetized advection-dominated accretion disc. We present steady-sate self similar solutions for the dynamical structure of such a type of the accretion flows....

  • The Magnetospheric Boundary in Cataclysmic Variables. Hellier, Coel // EPJ Web of Conferences;2014, Issue 64, p1 

    The magnetic cataclysmic variables (MCVs) present a wealth of observational diagnostics for studying accretion flows interacting with a magnetosphere. Spin-period pulsations from the rotation of the white dwarf are seen in optical light, in the UV and X-ray bands, and in polarimetry, and...

  • Full 3D MHD calculations of accretion flow structure in magnetic cataclysmic variables with strong, complex magnetic fields. Zhilkin, A.; Bisikalo, D.; Mason, P. // Astronomy Reports;Apr2012, Vol. 56 Issue 4, p257 

    We have performed three-dimensional magnetohydrodynamical calculations of stream accretion in cataclysmic variable stars for which the white dwarf primary possesses a strong, complex magnetic field. These calculations were motivated by observations of polars: cataclysmic variables containing...

  • Linear analysis of stabilizing mechanisms for the kink instability. Wanex, L. F.; Sotnikov, V. I.; Bauer, B. S.; Leboeuf, J. N. // Physics of Plasmas;Apr2004, Vol. 11 Issue 4, p1372 

    A study of stabilizing mechanisms for the m=1 kink instability in Z-pinch plasmas is presented. In the study we use a general set of equations that allows the investigation of the combined effect of axial sheared flow and an axial magnetic field on the development of the azimuthal mode m=1 kink...

  • Fiber lasers generating radially and azimuthally polarized light. Fridman, Moti; Machavariani, Galina; Davidson, Nir; Friesem, Asher A. // Applied Physics Letters;11/10/2008, Vol. 93 Issue 19, p191104 

    A simple, robust, and efficient method to produce either radially or azimuthally polarized output beam from a fiber laser is presented. Experimental results reveal that polarization purity of 90% or better can be obtained.

  • Three-dimensional Simulations of Accretion to Stars with Complex Magnetic Fields. Long, M.; Romanova, M. M.; Lovelace, R. V. E. // AIP Conference Proceedings;10/29/2008, Vol. 1068 Issue 1, p95 

    We investigate disk accretion onto rotating stars with different complex magnetic fields, including superpositions of misaligned dipole and quadrupole, off-centered dipoles and so on. The full three-dimensional magnetohydrodynamic simulations show that when the quadrupole component is comparable...

  • Spontaneous generation of toroidal currents. Sifeng Ma; Dawson, John M. // Physics of Plasmas;May94, Vol. 1 Issue 5, p1251 

    Examines a loss-cone mechanism for self-generation of toroidal currents in toroidal magnetic field configurations with a mirror-like vertical (poloidal) field. Better confinement of particles that carry a negative toroidal current; Dependence of mechanism on the curvature drift of particles.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics