pressure broadening

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The broadening of spectral lines from a star due to the high pressure of gas increasing the number of collisions between atoms in a star's atmosphere. In stellar atmospheres, high pressures are associated with strong surface gravity; thus main-sequence stars show intrinsically broader lines than do supergiants, while white dwarfs have extremely broad hydrogen lines because of this effect. See also stark broadening.

Subjects: Astronomy and Astrophysics.

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