Accretion disc - Wikipedia, the free encyclopedia
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An accretion disc is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a central body. The central body is typically a young star, a protostar, a white dwa...
en.wikipedia.org/wiki/Accretion_disc
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Protoplanetary accretion disk ... A rotating disk of gas and dust matter that may form around any of a variety of stars or other massive objects. ... In the case of young stars, accretion disks contain unconsolidated material, such as cosmic dust grains, which may subsequently accrete to form planets and other sizable...
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www.daviddarling.info/encyclopedia/A/accretiond.html
www.daviddarling.info/encyclopedia/A/accretiond.html
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Protoplanetary disk - Wikipedia, the free encyclopedia
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A protoplanetary disk (or proplyd ) is a rotating circumstellar disk of dense gas surrounding a young newly formed star, a T Tauri star or Herbig star. The protoplanetary disk may be considered an...
en.wikipedia.org/wiki/Protoplanetary_disk
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The dark, dusty disk represents a cold outer region which extends inwards to an ultra-hot accretion disk with a few hundred million miles from the suspected black hole. This disk feeds matter into the black hole, where gravity compresses and heats the material.
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seds.org/hst/ngc4261.html
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Here gas from a blue giant star is shown being stripped away into an accretion disk around its compact binary companion. Gas in the accretion disk swirls around, heats up, and eventually falls onto the compact star.
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antwrp.gsfc.nasa.gov/apod/ap991219.html
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Instead, the graphic shows spiral shock waves in a three dimensional simulation of an accretion disk -- material swirling onto a compact central object that could represent a white dwarf star, neutron star, or black hole.
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antwrp.gsfc.nasa.gov/apod/ap020927.html
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They could see details as fine as the neutron star's accretion disk, a ring of gas swirling around and flowing onto the neutron star, as the disk buckled from the explosion and then slowly recovered its original form after approximately 1,000 seconds.
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www.nasa.gov/centers/goddard/news/topstory/2004/0220sta...
www.nasa.gov/centers/goddard/news/topstory/2004/0220stardisk.html
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Accretion onto a stationary black hole has only been solved analytically under the assumption of spherical symmetry. Shapiro and Teukolsky (1983) give a Newtonian treatment of accretion, and Michel (1972) gives a full general relativistic one.
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scienceworld.wolfram.com/physics/AccretionDisk.html
scienceworld.wolfram.com/physics/AccretionDisk.html
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The disk models have a range of values for the outer radius, mass accretion rate, viscosity parameter , slope of dust distribution, maximum grain size and inclination angle with respect to observer.
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cfa-www.harvard.edu/youngstars/dalessio/
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