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Astron. Astrophys. 315, L369-L372 (1996)

The rich spectrum of circumstellar PAHs*

D.A. Beintema1, M.E. van den Ancker2, F.J. Molster2, L.B.F.M. Waters2,1, A.G.G.M. Tielens3, C. Waelkens4, T. de Jong2,1, Th. de Graauw1, K. Justtanont1, I. Yamamura1, A. Heras5, F. Lahuis1,5, and A. Salama5

1 SRON Groningen, P.O. Box 800, 9700 AV Groningen, The Netherlands
2 Astronomical Institute 'Anton Pannekoek', University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
3 NASA Ames Research Center, Mail Stop 245-3, Moffett Field, CA 94035, USA
4 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, B-3001 Heverlee, Belgium
5 ESA Villafranca, P.O. Box 50727, E-28080 Madrid, Spain

Received 29 July 1996 / Accepted 27 August 1996

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, IRAS21282+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 2.4-17 img1.gifm wavelength window.

Key words: stars: AGB and post-AGB - stars: mass loss - dust - planetary nebulae - infrared: stars

* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA

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