When these objects have low viscosity and have cooling advection currents, they are called "Polish doughnuts.
When these objects have low viscosity and have cooling advection currents, they are called "Polish doughnuts." Balbus and Hawley studied their magnetorotational instability. The interior of these objects contain x-ray emissions from quasi-periodic oscillations. A explanation of the Newtonian physics in these objects was given by Shapiro and Teukolsky, and a Blandford-Znajek process can take place in the presence of one of these objects. A model to measure the viscosity in these objects was proposed by Shakura and Sunyaev, and it's possible for these objects to have luminosities over ten times the Eddington limit. A system with one of these objects gets rid of angular momentum and not mass by means of jets emitted perpendicular to these objects. FTP, identify this structures which form from the compression of material built up around a star.
When these objects have low viscosity and have cooling advection currents, they are called "Polish doughnuts.
accretion disks