A circumstellar envelope (CSE) is a part of a
star
A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sk ...
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 variables and
OH/IR stars) eventually evolve into
protoplanetary nebulae, and circumstellar envelopes of
young stellar objects evolve into
circumstellar discs.
Types of circumstellar envelopes
*
Circumstellar envelopes of AGB stars
* Circumstellar envelopes around
young stellar objects
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
Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is consi ...
References
External links
The Structure and Evolution of Envelopes and Disks in Young Stellar Systems
Stellar evolution
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