description Sh2-104 Overview
Sh2-104 is a compact emission nebula and H II region located in the constellation Cygnus. It is recognized by its distinct bubble-like appearance, which is sculpted by stellar winds from its central, massive stars. Astronomers study Sh2-104 as a primary example of the collect-and-collapse model of triggered star formation. This model describes how an expanding bubble of gas compresses surrounding material, leading to the birth of new stars along its rim.
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What is Sh2-104?
Sh2-104 is a compact emission nebula and H II region in Cygnus. Its bubble-like shell is shaped by stellar winds and radiation from massive stars inside or near the nebula.
Why does Sh2-104 look like a bubble?
The central massive stars push into the surrounding gas through ionizing radiation and stellar winds, producing an expanding shell. This structure is why Sh2-104 is often studied as an example of feedback-driven nebular evolution.
What does collect-and-collapse mean in studies of Sh2-104?
The collect-and-collapse model proposes that an expanding ionized shell gathers surrounding molecular gas until parts of the shell become gravitationally unstable. Research on Sh2-104 has treated it as an important observational example of this possible triggered-star-formation process. [research summary](https://arxiv.org/abs/1709.08779)
What kind of object is Sh2-104 compared with a reflection nebula?
Sh2-104 is an emission nebula because its gas glows after being ionized by nearby hot stars. A reflection nebula mainly shines by scattering existing starlight, so the physical mechanism and typical color structure differ.
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