Astrophysics (index)about

circumstellar disk

(disk or ring shaped accumulation of matter around a star)

A circumstellar disk (in context, just disk) is matter, typically in a ring, collected around a star. It can be composed of gas, dust, planetesimals, or a combination, in orbit around the star. For young stars, for which the term protoplanetary disk is used, it may be the raw material of later planets. The asteroids around the Sun represent a thin circumstellar disk.

Excess infrared from a star is evidence of a disk.

Older stars can also have disks such as debris disks.

(disks,object type)

Referenced by:
Be star
Bondi radius
circumplanetary disk
corotation torque
corotation resonance (CR)
dead zone
debris disk
extra-solar planet
GG Tau
Hall effect
Keplerian disk
mass transport
Poynting-Robertson effect
protoplanetary disk (PPD)
Roche limit
surface density (Σ)