The rich spectrum of circumstellar PAHs.
Waters, L. B. F. M.; Beintema, D. A.; de Graauw, T.; Justtanont, K.; Salama, A.; Tielens, A. G. G. M.; van den Ancker, M. E.; Heras, A.; Waelkens, C.; Yamamura, I.; Lahuis, F.; Molster, F. J.; de Jong, T.
Abstract
We present observations taken with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory (ISO) of three evolved C-rich stars, the post-AGB star HR 4049 and two planetary nebulae, IRAS 21282+5050 and NGC 7027. The spectra are dominated by the well-known infrared emission bands, attributed to Polycyclic Aromatic Hydrocarbons (PAHs). The SWS spectra for the first time allow a complete overview of the richness of the PAH spectrum with high spectral resolution and high S/N. We present an inventory of the spectral features in the 2.4-17μm wavelength window.