Accretion disk | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-23

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Accretion_disk


00:01:00 1 Manifestations
00:04:48 2 Accretion disk physics
00:08:11 2.1 α-Disk Model
00:23:38 2.2 Magnetorotational instability
00:25:52 2.3 Magnetic fields and jets
00:28:33 3 Analytic models of sub-Eddington accretion disks (thin disks, ADAFs)
00:32:47 4 Analytic models of super-Eddington accretion disks (slim disks, Polish doughnuts)
00:34:21 5 Excretion disk



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SUMMARY
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An accretion disk is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a massive central body. The central body is typically a star. Friction causes orbiting material in the disk to spiral inward towards the central body. Gravitational and frictional forces compress and raise the temperature of the material, causing the emission of electromagnetic radiation. The frequency range of that radiation depends on the central object's mass. Accretion disks of young stars and protostars radiate in the infrared; those around neutron stars and black holes in the X-ray part of the spectrum. The study of oscillation modes in accretion disks is referred to as diskoseismology.