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microturbulence
Small-scale motions (up to 5 km/s) in a stellar atmosphere that broaden the star’s spectral lines and may contribute to their effective width. In practice, astronomers may attribute any broadening of a spectral line, not accounted for by known causes, such as motions of the emitting atoms, to microturbulence, whether or not it is actually present. Compare with macroturbulence.
Related category
• STELLAR ASTROPHYSICS
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