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NAM2012 - All Presentation Details

Record 738 of 756

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Dual Chemistry of GB PNe from HST, VLT and Spitzer

Author: Lizette Guzman-Ramirez

JBCA, University of Manchester

Co-Authors: Albert Zijlstra

Session: STA2: Binary Stars: Duplicity is Everywhere

Presentation type: Poster      Poster Session B   


Galactic Bulge Planetary Nebulae show evidence of mixed chemistry with emission from both silicate dust and PAHs. We analysed a sample of 40 nebulae using Sptizer, a sub-sample of these were observed with HST and VLT (UVEX and VISIR). A strong correlation is found between strength of the PAH bands and morphology, in particular, the presence of a dense torus. A chemical model is presented which shows that hydrocarbon chains can form within oxygen-rich gas through gas-phase chemical reactions. We conclude that the mixed chemistry phenomenon occurring in the Galactic Bulge Planetary Nebulae is best explained through hydrocarbon chemistry in an UV-irradiated, dense torus.

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