| Revista Mexicana de Astronoma y Astrofsica, 39, 55--67 (2003) (2007) | |||||||||||||
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| The magnitude of the temperature fluctuations (t ) required to explain the observed inconsistencies between metallicities inferred from recombination lines and from forbidden lines cannot be attained by steady-state equilibrium photoionization models. If, on the other hand, the nebular ionizing source were variable, the temperature fluctuations t would be significantly larger. We investigate the time-dependent response of the nebular ionization and temperature structure when photoionized by a periodically varying source. We study how the asymptotic mean value, , behaves as a function of the period or amplitude of the source variability. | |||||||||||||
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