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Line 1: '''Planetary nebula luminosity function''' ('''PNLF''') is a secondary<ref name="Ferrareseetal2000" /> [[standard candle\|distance indicator]] used in [[astronomy]]. It makes use of the [[O III\|[O III]]] λ5007 [[forbidden line]] found in all [[planetary nebula]] (PNe) which are members of the old stellar populations ([[Population II]]).<ref name="Ferrareseetal2000">{{harvnb\|Ferrarese\|Ford\|Huchra\|Kennicutt\|2000}}</ref> It ~~works~~can ~~well~~be ~~for~~used to determine distances to both [[spiral galaxy\|spiral]] and [[elliptical galaxy\|elliptical]] galaxies despite their completely different [[stellar populations]] and is part of the [[Extragalactic Distance Scale]].<ref name="=Schoenberneretal2007">{{harvnb\|Schoenberner\|Jacob\|Steffen\|Sandin\|2007}}</ref> == Procedure ==

Planetary nebula luminosity function: Difference between revisions