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ISO-SWS spectra of Planetary Nebulae with low-mass [WC] central stars: a mixed C- and O-rich dust chemistry

Published online by Cambridge University Press:  25 May 2016

Patrick W. Morris ,
L.B.F.M. Waters  and
Douwe A. Beintema
Patrick W. Morris
Affiliation:
Astronomical Institute, University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, the Netherlands SRON, Sorbonnelaan 2, NL-3584 CA Utrecht, the Netherlands
L.B.F.M. Waters
Affiliation:
Astronomical Institute, University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, the Netherlands
Douwe A. Beintema
Affiliation:
SRON, Landleven 12, NL-9700 AV Groningen, the Netherlands

Extract

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The timing of PNe formation around low-mass WC stars is unsettled with respect to pulsations early in the post-AGB phase, or later thermal pulses (e.g., Tylenda & Gorny 1997). The chemistry of the dust in the nebulae can be used to trace the mass-loss history. Using ISO-SWS spectroscopy, the PNe BD+30°3639 [WC9] and He2–113 [WC11] have been identified by Waters et al. (1998) to exhibit emission from C-rich dust (PAHs) in the surrounding envelopes at λ 15 μm, while O-abundant silicate features are present at longer wavelengths. Figure 1 shows the PAH features, which include additional WCPNe observations to extend the range of stellar spectral subtypes.

Type
Part 3. Interaction of Wolf-Rayet stars and other hot massive stars with their environment: colliding winds and ring nebulae
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 376 - 377
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Hamann, W.-R. 1997, in: Habing, H.J. & Lamers, H. (eds.), Planetary Nebulae, Proc. IAU Symp. No. 180 (Kluwer: Dordrecht), p. 91 Google Scholar
Tylenda, R., Górny, S.K. 1997, in: Habing, H.J. & Lamers, H. (eds.), Planetary Nebulae, Proc. IAU Symp. No. 180 (Kluwer: Dordrecht), p. 371 Google Scholar
Waters, L.B.F.M., Beintema, D.A., Zijlstra, A.A., de Koter, A., Molster, F.J., Bouwman, J., de Jong, T., Pottasch, S.R., de Graauw, Th. 1998, A&A 331, L61 Google Scholar