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SOFIA observations of the planetary nebula NGC 7009

Published online by Cambridge University Press:  30 August 2012

R. H. Rubin ,
S. W. J. Colgan ,
R. L. M. Corradi ,
R. Sankrit ,
A. G. G. M. Tielens ,
Y. G. Tsamis  and
V. Sivaraja
R. H. Rubin
Affiliation:
NASA/Ames
S. W. J. Colgan
Affiliation:
NASA/Ames
R. L. M. Corradi
Affiliation:
Instituto de Astrofísica de Canarias
R. Sankrit
Affiliation:
SOFIA Science Center
A. G. G. M. Tielens
Affiliation:
Leiden Observatory
Y. G. Tsamis
Affiliation:
ESO
V. Sivaraja
Affiliation:
NASA/Ames
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Abstract

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We report spectrophotometric observations made with SOFIA/FORCAST on 2011 June 2 UT. Optical measurements have previously shown that the abundance discrepancy factor (adf) varies with position in several high-adf PNe, and is highest close to the central star. The very low electron temperature inclusions postulated to explain the abundance discrepancy, must be cooled predominantly by fine structure IR lines. These SOFIA data will map mid-IR FS lines (and our related Herschel program will add several far-IR FS lines) in the bright, well-characterized, high-adf PN NGC 7009. We will compare these IR results with FS optical line measurements in order to correlate ratios of IR to optical fluxes with position, and thus correlate with where the adf peaks.

Keywords

ISM: abundancesplanetary nebulae: individual (NGC 7009)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 67 - 70
Copyright
Copyright © International Astronomical Union 2012

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