HII regions slides
HII regions slides
HII regions slides
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Fraction of O2+ ions able to emit 4959-Afraction of O 2+ ions able to emit 4959n i(T e)2000 4000 6000 8000 10000 12000 14000 16000Temperature of nebula (K)Measure forbidden lines from all ionic stages of an element (e.g. O, O + ,O 2+ )add up all the abundances to find the total abundance relative tohydrogen.