Poster abstract details
The Ionization State of the Halo PN NGC 2438
Abstract
NGC 2438 is a classical multiple shell or halo planetary nebula. Its central star and the main nebula are well studied. Also it was target of hydrodynamic simulations. This initiated a discussion whether the haloes are mainly containing recombined gas, or if they are still ionized.
We analyzed narrow-band images and long slit spectra at multiple positions to obtain a deeper look on morphological details and the properties of the outer shell and the halo. Using temperature measurements from emission lines we got an electron temperature which clearly indicates a fully ionized stage. Additionally measurements of the electron density suggest a variation of the filling factor.
Based on those results, we conclude that there is no major fraction of recombination in this phase.
We analyzed narrow-band images and long slit spectra at multiple positions to obtain a deeper look on morphological details and the properties of the outer shell and the halo. Using temperature measurements from emission lines we got an electron temperature which clearly indicates a fully ionized stage. Additionally measurements of the electron density suggest a variation of the filling factor.
Based on those results, we conclude that there is no major fraction of recombination in this phase.