Paper:	The Rich Carbon Chemistry of SMP LMC 11
Volume:	445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Page:	347
Authors:	Malek, S. E.; Cami, J.
Abstract:	We present an analysis of the Spitzer–IRS spectrum of the proto-planetary nebula SMP LMC 11. This spectrum displays unusually strong absorption bands from cool, carbon-rich gas, including benzene (C6H6), (poly)acetylenes (C2H2, C4H2 and C6H2), HC3N, and propyne (CH3C2H); HCN on the other hand is at best marginally present. We derive column densities and temperatures by modelling the molecular absorption. While the relative abundances of the polyacetylenes are consistent with chemical models for the outer envelopes of evolved carbon stars, those for HC3N and HCN are not. It is not clear whether the presence of benzene indicates an efficient means of formation, or instead a protective environment that inhibits photo-destruction.

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