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accretion disk
(redirected from Accretion disc)

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
accretion disk [ə′krē·shən ‚disk]
(astronomy)
A viscous structure consisting of gas lost by a red giant or supergiant flowing around a companion main-sequence star or compact object (white dwarf, neutron star, or black hole).


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In the absence of a significant white dwarf magnetic field, material from the secondary passes through an accretion disc before settling on the surface of the white dwarf.
In the case of the Crab Nebula (M1), the neutron star was sufficiently close that Chandra could resolve detail in its accretion disc (see Figure 4) and show the jets emerging from its two poles.
Dr Boyd then presented preliminary results on two eclipsing SW Sex stars, V1315 Aql and V363 Aur, and described a proposed concentrated worldwide observing campaign on the superhumping SW Sex star DW Ursae Majoris, to investigate if there is a correlation between the precession phase of the accretion disc and the depth of eclipses.
 
 
 
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