Planetary nebula luminosity function
Astronomical function / From Wikipedia, the free encyclopedia
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Planetary nebula luminosity function (PNLF) is a secondary[1] distance indicator used in astronomy. It makes use of the [O III] λ5007 forbidden line found in all planetary nebula (PNe) which are members of the old stellar populations (Population II).[1] It can be used to determine distances to both spiral and elliptical galaxies despite their completely different stellar populations and is part of the Extragalactic Distance Scale.[2]