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Airborne observations of far-infrared emission lines from the photodissociation regions in Planetary Nebulae: Properties and masses of the neutral components

Published online by Cambridge University Press:  25 May 2016

Harriet L. Dinerstein ,
Michael R. Haas ,
Edwin F. Erickson  and
Michael W. Werner
Harriet L. Dinerstein
Affiliation:
1University of Texas at Austin
Michael R. Haas
Affiliation:
2NASA Ames Research Center
Edwin F. Erickson
Affiliation:
2NASA Ames Research Center
Michael W. Werner
Affiliation:
3Jet Propulsion Laboratory

Extract

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Measurements of the main far-infrared cooling lines from photodissociation regions in planetary nebulae were obtained with NASA's Kuiper Airborne Observatory, using a moderate-resolution far-infrared cooled grating spectrometer (Erickson et al. 1985). We surveyed about 20 nebulae in the [O I] 63 μm line, and detected it in most of the observed objects. We found that its strength correlates well with the total far-infrared power, with an average ratio of about 0.2%, as predicted by models of photodissociation regions (e.g. Tielens & Hollenbach 1985; Wolfire et al. 1990). Strong 63 μm emission is absent only for objects in which the ionization of the gas is just beginning and for a few evolved objects where the ionized nebula is probably matter-bounded.

Type
IV. Envelopes
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 220
Copyright
Copyright © Kluwer 1997 

References

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