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Spectroscopy of planetary nebulae with [WR] nuclei

Published online by Cambridge University Press:  25 May 2016

Miriam Peña ,
Grazyna Stasińska ,
César Esteban ,
Lars Koesterke ,
Selene Medina  and
Robin Kingsburgh
Miriam Peña
Affiliation:
Instituto de Astronomía, UNAM, Apdo. Postal 70264, México, D.F. 04510
Grazyna Stasińska
Affiliation:
DAEC, Observatoire de Paris-Meudon, 92195 Meudon Cedex, France
César Esteban
Affiliation:
Instituto de Astrofísica de Canarias, Spain
Lars Koesterke
Affiliation:
Lehrstuhl Astrophysik der Universitat Potsdam, Germany
Selene Medina
Affiliation:
Instituto de Astronomía, UNAM, Apdo. Postal 70264, México, D.F. 04510
Robin Kingsburgh
Affiliation:
Department of Physics and Astronomy, York University, Canada

Extract

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We have started an extensive program of systematic observations of planetary nebulae excited by [WR] nuclei with the aim of understanding the evolutionary status of the central stars. Detailed analysis of the nebular and stellar properties might reveal the presence of abundance variations across the nebulae, and allows to detect possible interactions between the massive stellar wind and the nebula. Such an analysis requires spatially resolved spectra, together with a reliable procedure to derive chemical abundances. This is best achieved by constructing individual photo-ionization models that reproduce the main observed properties. Here we present the spectroscopic analysis made for different knots of PB6, NGC2452, NGC2867, NGC6905 and He2–55. All these nebulae are ionized by [WC 2–3] stars and present very high ionization degrees.

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. 382 - 383
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Koesterke, L., Hamann, W.-R. 1997, in: Habing, H.J. & Lamers, H. (eds.), Planetary Nebulae, Proc. IAU Symp. No. 180 (Dordrecht: Kluwer), p. 114 Google Scholar
Peña, M., Stasińska, G., Esteban, C., Koesterke, L., Medina, S., Kingsburgh, R. 1998, A&A 337, 866 Google Scholar