Astrochemistry and Astromineralogy at Low Metallicity

Details Astrochemistry and Astromineralogy at Low Metallicity Astrochemistry and Astromineralogy at Low Metallicity

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50338m&link_type=abstract

Spitzer Proposal ID #50338

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Scientific paper

We propose to investigate the mineralogy and chemistry of dust around low-metallicity extragalactic post-asymptotic giant branch (AGB) objects. The way simple hydrocarbons such as acetylene (C2H2) (which are observed around the AGB stars) arises, their transition into more complex molecular forms such as polycyclic aromatic hydrocarbons (PAHs) and other dust particles (common in reflection nebulae, star forming regions (SFRs), and planetary nebulae), are still poorly understood. Recent infrared observations of post-AGB sources, however, suggest that these objects, in transition from the AGB to PNe, may play a key role in our understanding of the dust chemistry, as well as elucidating an elusive phase of stellar evolution. With the Infrared Spectrograph on Spitzer, we will observe a selection of known post-AGB objects and infrared-selected candidates to explore the evolution of molecules from simple to complex hydrocarbons to small dust grains.

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