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C/O abundance ratios and dust features in galactic planetary nebulae

Published online by Cambridge University Press:  30 August 2012

Gloria Delgado-Inglada  and
Mónica Rodríguez
Gloria Delgado-Inglada
Affiliation:
Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Apdo Postal 51 y 216, 72000 Puebla, Pue. Mexico, email: [email protected], [email protected]
Mónica Rodríguez
Affiliation:
Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Apdo Postal 51 y 216, 72000 Puebla, Pue. Mexico, email: [email protected], [email protected]
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Abstract

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The iron depletion factors found in Galactic planetary nebulae (PNe) span over two orders of magnitude, suggesting that there are differences in the grain formation and destruction processes from object to object. We explore here the relation between the iron depletions, the infrared dust features, and the C/O abundance ratios in a sample of Galactic PNe. We find that those objects with C/O<1 show a trend of increasing depletions for higher values of C/O, whereas PNe with C/O>1 break the trend and cover all the range of depletions. Most of the PNe with C/O<1 show silicate features, but several PNe with C-rich features have C/O<1, probably reflecting the uncertainties associated with the derivation of C/O. PAHs are distributed over the entire range of iron depletions and C/O values.

Keywords

planetary nebulae: generalISM: abundancesdustextinctioninfrared: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 342 - 343
Copyright
Copyright © International Astronomical Union 2012

References

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