Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-23T07:00:42.655Z Has data issue: false hasContentIssue false
  • English
  • Français

The ionization state of the halo planetary nebula NGC 2438

Published online by Cambridge University Press:  30 August 2012

Silvia Dalnodar
Silvia Dalnodar*
Affiliation:
Institute of Astro- and Particle Physics, University Innsbruck, Technikerstrasse 25/8, A-6020 Innsbruck, Austria
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

NGC 2438 is a classical multiple shell or halo planetary nebula (PN). Its central star and the main nebula are well studied. Also it was target of various hydrodynamic simulations (Corradi et al. 2000). This initiated a discussion whether the haloes are mainly containing recombined gas (Schönberner et al. 2002), or if they are still ionized (Armsdorfer et al. 2003). An analysis of narrow-band images and long slit spectra at multiple slit positions was done to obtain a deeper look on morphological details and the properties of the outer shell and halo. For this work there was data available from ESO (direct imaging and long slit spectroscopy) and from SAAO (spectroscopic observations using a small slit, scanning over the whole nebula). Using temperature measurements from emission lines resulted in an electron temperature which clearly indicates a fully ionized stage. Additionally measurements of the electron density suggest a variation of the filling factor.

Keywords

planetary nebulae: individual (NGC 2438)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 338 - 339
Copyright
Copyright © International Astronomical Union 2012

References

Corradi, R. L. M., Schönberner, D., Steffen, M., & Perinotto, M. 2000, A&A, 354, 1071 Google Scholar
Schönberner, D. & Steffen, M. 2002, Rev. Mexicana AyA, 12, 144 Google Scholar
Armsdorfer, B., Kimeswenger, S., & Rauch, T. 2003, Planetary Nebulae: Their Evolution and Role in the Universe, Proc. IAU Symposium Vol. 209, 511 Google Scholar
Ferland, G. J., Korista, K. T., Verner, D. A., Ferguson, J. W., Kingdon, J. B., & Verner, E. M. 1998, PASP, 110, 761 Google Scholar
Osterbrock, D. E. & Ferland, G. J. 2006, Astrophysics of gaseous nebulae and active galactic nuclei Sausalito CA: University Science Books Google Scholar