The circumstellar envelope is the part of the star having roughly spherical shape and not gravitationally bound to the star core. Usually circumstellar envelopes are formed from the dense stellar wind, or they are present before formation of the star. Circumstellar envelopes of the old stars (Mira variables and OH/IR stars) are eventually evolving into protoplanetary nebulae, and circumstellar envelopes of the young stellar objects  are evolving into circumstellar discs.
Types of circumstellar envelopes
- Leao; Patrick De Laverny; Mekarnia; De Medeiros; Benoit Vandame (2007). "The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales". arXiv:astro-ph/0703390 [astro-ph].
- Leslie Looney; Lee Mundy; Jack Welch (2003). "Envelope Emission in Young Stellar Systems, A Sub-Arcsecond Survey of Circumstellar Structure". arXiv:astro-ph/0303640 [astro-ph].
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