ISO Observations of the Unidentified 30 Micron Feature in Proto-Planetary
Nebulae.
Volk K., Kwok S., Hrivnak B.J., Szczerba R.
2002, ApJ, 567, 412
Abstract:
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The intrinsic emission profile of the unidentified broad 30 micron emission
feature is derived from ISO spectra of proto-planetary nebulae (PPNs).
The feature is resolved into two components: a narrower feature at 26 micron
and a broader feature at 33 micron. This improves upon the initial study
of these two components by Hrivnak et al. (2000). The intrinsic profiles
of these two features and their varying strengths in PPNs are determined.
The chemical origin of these features and the processes responsible for
their changing strengths from AGB stars to PPNs to planetary nebulae are
discussed.
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