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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > emission line > inverse P Cygni line

inverse P Cygni line comparison table

Subject	has definition	is a kind of
emission line	Bright lines produced in a spectrum by a luminous source, such as a star or a bright nebula.	spectral line
inverse P Cygni line	An emission line in which the emission is on the violet side of the absorption. It is usually interpreted to mean infall of matter.	emission line

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