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Molecular processes from the AGB to the PN stage

Published online by Cambridge University Press:  30 August 2012

D. Anibal García-Hernández
D. Anibal García-Hernández*
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38200 La Laguna, Spain email: agarcia@iac.es Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38205 La Laguna, Spain
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Abstract

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Many complex organic molecules and inorganic solid-state compounds have been observed in the circumstellar shell of stars (both C-rich and O-rich) in the transition phase between Asymptotic Giant Branch (AGB) stars and Planetary Nebulae (PNe). This short (~102-104 years) phase of stellar evolution represents a wonderful laboratory for astrochemistry and provides severe constraints on any model of gas-phase and solid-state chemistry. One of the major challenges of present day astrophysics and astrochemistry is to understand the formation pathways of these complex organic molecules and inorganic solid-state compounds (e.g., polycyclic aromatic hydrocarbons, fullerenes, and graphene in the case of a C-rich chemistry and oxides and crystalline silicates in O-rich environments) in space. In this review, I present an observational review of the molecular processes in the late stages of stellar evolution with a special emphasis on the first detections of fullerenes and graphene in PNe.

Keywords

Astrochemistrymolecular processesplanetary nebulae: generalstars: AGB and post-AGBdust

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