SOFIA observations of the planetary nebula NGC 7009

Bibcode
2012IAUS..283...67R
DOI
10.1017/S174392131201071X
Rubin, R. H.; Colgan, S. W. J.; Corradi, R. L. M.; Sankrit, R.; Tielens, A. G. G. M.; Tsamis, Y. G.; Sivaraja, V.
Bibliographical reference

Planetary Nebulae: An Eye to the Future, Proceedings of the International Astronomical Union, IAU Symposium, Volume 283, p. 67-70

Advertised on:
8
2012
Number of authors
7
IAC number of authors
1
Citations
1
Refereed citations
1
Description
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.
Type
Non-refereed
Planetary nebulae

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