A circumstellar envelope (CSE) is a part of a
star that has a roughly spherical shape and is not gravitationally bound to the star core. Usually circumstellar envelopes are formed from the dense
stellar wind, or they are present before the formation of the star. Circumstellar envelopes of old stars (
Mira variable
Mira variables (named for the prototype star Mira) are a class of pulsating stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavele ...
s and
OH/IR stars) eventually evolve into
protoplanetary nebulae, and circumstellar envelopes of
young stellar object
Young stellar object (YSO) denotes a star in its early stage of evolution. This class consists of two groups of objects: protostars and pre-main-sequence stars.
Classification by spectral energy distribution
A star forms by accumulation of mate ...
s evolve into
circumstellar discs.
Types of circumstellar envelopes
*
Circumstellar envelopes of AGB stars
* Circumstellar envelopes around
young stellar object
Young stellar object (YSO) denotes a star in its early stage of evolution. This class consists of two groups of objects: protostars and pre-main-sequence stars.
Classification by spectral energy distribution
A star forms by accumulation of mate ...
s
See also
*
Circumstellar dust
*
Common envelope
In astronomy, a common envelope (CE) is gas that contains a binary star system. The gas does not rotate at the same rate as the embedded binary system. A system with such a configuration is said to be in a common envelope phase or undergoing comm ...
s
*
Stellar evolution
References
External links
The Structure and Evolution of Envelopes and Disks in Young Stellar Systems
{{Molecules detected in outer space
Stellar evolution