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Far-infrared spectroscopy of Planetary Nebulae with the KAO

Published online by Cambridge University Press:  25 May 2016

R. H. Rubin ,
S.W.J. Colgan ,
M.R. Haas ,
S. D. Lord  and
J. P. Simpson
R. H. Rubin
Affiliation:
1NASA Ames Research Center 2Orion Enterprises
S.W.J. Colgan
Affiliation:
1NASA Ames Research Center 3SETI Institute
M.R. Haas
Affiliation:
1NASA Ames Research Center
S. D. Lord
Affiliation:
4IPAC/California Institute of Technology
J. P. Simpson
Affiliation:
1NASA Ames Research Center 3SETI Institute

Extract

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We present new far-infrared line observations of the planetary nebulae (PNs) NGC 7027, NGC 7009, NGC 6210, NGC 6543, and IC 4997 obtained with the Kuiper Airborne Observatory (KAO). The bulk of our data are for NGC 7027 and NGC 7009, including [Ne V] 24 μm, [O IV] 26 μm, [O III] (52, 88μm), and [Nm] 57 μm. Our data for [O III] (52, 88) and [N III] 57 in NGC 7027 represent the first measurements of these lines in this source. The large [O III] 52/88 flux ratio implies an electron density (cm–3) of log Ne [O III] = 4.19, the largest Ne ever inferred from these lines. We derive N++/O++ = 0.394±0.062 for NGC 7027 and 0.179±0.043 for NGC 6210. We are able to infer the O+3/O++ ionic ratio from our data. As gauged by this ionic ratio, NGC 7027 is substantially higher ionization than is NGC 7009 – consistent with our observation that the former produces copious [Ne V] emission while the latter does not. These data help characterize the stellar ionizing radiation field.

Type
IV. Envelopes
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 278
Copyright
Copyright © Kluwer 1997 

References

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