Infrared Space Observatory Observations of the Unidentified 30 Micron Feature in Proto-Planetary Nebulae

Astronomy and Astrophysics – Astronomy

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Stars: Circumstellar Matter, Infrared: Stars, Ism: Lines And Bands, Ism: Planetary Nebulae: General, Radiative Transfer, Stars: Agb And Post-Agb

Scientific paper

The intrinsic emission profile of the unidentified broad 30 μm emission feature is derived from Infrared Space Observatory (ISO) spectra of proto-planetary nebulae (PPNs). The feature is resolved into two components: a narrower feature at 26 μm and a broader feature at 33 μm. 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 asymptotic giant branch (AGB) stars to PPNs to planetary nebulae are discussed. Based on observations made with ISO, an ESA project with instruments funded by the ESA member states (especially the PI countries: France, Germany, the Netherlands, and the United Kingdom) with the participation of ISAS and NASA.

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