Compact stars and accretion disks: Workshop summary

1998 ◽  
Vol 15 (2) ◽  
pp. 240 ◽  
Author(s):  
J Li
Keyword(s):  
Accretion Disks ◽  
Compact Stars ◽  
Workshop Summary

A New Instability of Accretion Disks around Magnetic Compact Stars

1998 ◽  
Vol 503 (1) ◽  
pp. 350-360 ◽  
Author(s):  
Mario Vietri ◽  
Luigi Stella
Keyword(s):  
Accretion Disks ◽  
Compact Stars

Spectral Modeling of Accretion Disks around Compact Stars

2009 ◽  
Author(s):  
Thorsten Nagel ◽  
Stephan Hartmann ◽  
Thomas Rauch ◽  
Klaus Werner ◽  
Ivan Hubeny ◽  
...  
Keyword(s):  
Accretion Disks ◽  
Compact Stars ◽  
Spectral Modeling

scholarly journals Kinematic Dynamo in Turbulent Circumstellar Disks

1993 ◽  
Vol 157 ◽  
pp. 203-207
Author(s):  
T. Stepinski
Keyword(s):  
Magnetic Fields ◽  
Normal Mode ◽  
Accretion Disk ◽  
Accretion Disks ◽  
Adiabatic Approximation ◽  
Circumstellar Disks ◽  
Compact Stars ◽  
Kinematic Dynamo ◽  
Protoplanetary Nebulae ◽  
Galactic Dynamos

Many circumstellar disks associated with objects ranging from protoplanetary nebulae to accretion disks around compact stars allow for the generation of magnetic fields by an αω dynamo. We have applied kinematic dynamo formalism to geometrically thin accretion disks. We calculate, in the framework of an adiabatic approximation, the normal mode solutions for dynamos operating in disks around compact stars. We then describe the criteria for a viable dynamo in protoplanetary nebulae, and discuss the particular features that make accretion disk dynamos different from planetary, stellar, and galactic dynamos.

scholarly journals Magnetohydrodynamic Origin of Jets from Accretion Disks

1999 ◽  
Vol 194 ◽  
pp. 208-218 ◽  
Author(s):  
R.V.E. Lovelace ◽  
G.V. Ustyugova ◽  
A.V. Koldoba
Keyword(s):  
Accretion Disks ◽  
Mass Flux ◽  
Compact Stars ◽  
Young Stellar Objects ◽  
Region Of Origin ◽  
Stellar Objects ◽  
New Developments ◽  
Poynting Flux ◽  
Radio Jets ◽  
Astrophysical Objects

A review is made of recent magnetohydrodynamic (MHD) theory and simulations of origin of jets from accretion disks. Many compact astrophysical objects emit powerful, highly-collimated, oppositely directed jets. Included are the extra galactic radio jets of active galaxies and quasars, and old compact stars in binaries, and emission line jets in young stellar objects. It is widely thought that these different jets arise from rotating, conducting accretion disks threaded by an ordered magnetic field. The twisting of the B field by the rotation of the disk drives the jets by magnetically extracting matter, angular momentum, and energy from the accretion disk. Two main regimes have been discussed theoretically, hydromagnetic winds which have a significant mass flux, and Poynting flux jets where the mass flux is negligible. Over the past several years, exciting new developments on models of jets have come from progress in MHD simulations which now allow the study of the origin -the acceleration and collimation - of jets from accretion disks. Simulation studies in the hydromagnetic wind regime indicate that the outflows are accelerated close to their region of origin whereas the collimation occurs at much larger distances.

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