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- W2000291118 abstract "Abstract We derive the chlorine abundances in a sample of nearby planetary nebulae (PNe) and H II regions that have some of the best available spectra. We use a nearly homogeneous procedure to derive the abundance in each object and find that the Cl/H abundance ratio shows similar values in H II regions and PNe. This supports our previous interpretation that the underabundance we found for oxygen in the H II regions is due to the depletion of their oxygen atoms into organic refractory dust components. For other elements, the bias introduced by ionization correction factors in their derived abundances can be very important, as we illustrate here for sulfur using photoionization models. Even for low-ionization PNe, the derived sulfur abundances can be lower than the real ones by up to 0.3 dex, and the differences found with the abundances derived for H II regions that have similar S/H can reach 0.4 dex." @default.
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- W2000291118 date "2011-07-01" @default.
- W2000291118 modified "2023-09-27" @default.
- W2000291118 title "Chlorine and sulfur in nearby planetary nebulae and H II regions" @default.
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- W2000291118 doi "https://doi.org/10.1017/s1743921312012069" @default.
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