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The “21” μm and “30” μm Emission Features in Planetary Nebulae with Wolf-Rayet Central Stars

Published online by Cambridge University Press:  26 May 2016

Sacha Hony ,
L.B.F.M. Waters  and
A.G.G.M. Tielens
Sacha Hony
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, The Netherlands
L.B.F.M. Waters
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, The Netherlands
A.G.G.M. Tielens
Affiliation:
SRON Laboratory for Space Research Groningen, The Netherlands

Abstract

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We present mid infrared spectra of two planetary nebulae with H poor central stars that exhibit the “21” and “30” μm emission features. These features are found in carbon rich dust surroundings. The presence of these features shows that these sources have suffered an extended period of carbon rich mass loss before becoming H poor. We discuss the occurrence of both O-rich and C-rich dust in the sample of planetary nebulae observed with the Infrared Space Observatory.

Type
Part V: Dust and Molecules in Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 299 - 300
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

Cohen, M., Barlow, M. J., Sylvester, R. J., et al. 1999, ApJ, 513, L135 Google Scholar
Hony, S., Waters, L. B. F. M., & Tielens, A. G. G. M. 2001, A&A, 378, L41 Google Scholar
Waters, L. B. F. M., Beinteman, D. A., Zijlstra, A. A., et al. 1998, A&A, 331 Google Scholar