A Spitzer/IRS spectral study of a sample of galactic carbon-rich proto-planetary nebulae

Details A Spitzer/IRS spectral study of a sample of galactic carbon-rich proto-planetary nebulae A Spitzer/IRS spectral study of a sample of galactic carbon-rich proto-planetary nebulae

2010-10-07

arxiv.org/abs/1010.1327v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

32 pages, 11 figures, accepted for publication in ApJ

Scientific paper

Recent infrared spectroscopic observations have shown that proto-planetary nebulae (PPNs) are sites of active synthesis of organic compounds in the late stages of stellar evolution. This paper presents a study of Spitzer/IRS spectra for a sample of carbon-rich PPNs, all except one of which show the unidentified 21 micron emission feature. The strengths of the aromatic infrared band (AIB), 21 micron, and 30 micron features are obtained by decomposition of the spectra. The observed variations in the strengths and peak wavelengths of the features support the model that the newly synthesized organic compounds gradually change from aliphatic to aromatic characteristics as stars evolve from PPNs to planetary nebulae.

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