Abstract
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.
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© 1997 Springer Science+Business Media Dordrecht
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Dinerstein, H.L., Haas, M.R., Erickson, E.F., Werner, M.W. (1997). Airborne Observations of Far-Infrared Emission Lines from the Photodissociation Regions in Planetary Nebulae: Properties and Masses of the Neutral Components. In: Habing, H.J., Lamers, H.J.G.L.M. (eds) Planetary Nebulae. International Astronimical Union / Union Astronomique Internationale, vol 180. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5244-0_77
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DOI: https://doi.org/10.1007/978-94-011-5244-0_77
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