The composition and evolution of circumstellar dust from AGB to post-AGB and PNe phases.

Details The composition and evolution of circumstellar dust from AGB to post-AGB and PNe phases. The composition and evolution of circumstellar dust from AGB to post-AGB and PNe phases.

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3235w&link_type=abstract

Spitzer Proposal ID #3235

Computer Science

Scientific paper

Mid-IR spectroscopy has revealed systematic differences in the dust compounds present around AGB, post-AGB objects and PNe. This has been interpreted as evidence for a rapid evolution of circumstellar dust when low mass stars transit from the AGB to the post-AGB and PNe phases. Moreover, few of these dust spectral signatures are present in the ISM, casting some doubt on the interrelationship of circumstellar and interstellar dust. However, these previous studies were limited to the brightest objects of these different classes and did not probe a homogeneous sample of stars in these phases. Here, we propose to obtain IRS spectra in SH, LH, and SL mode of highly evolved, low and intermediate mass stars. Particularly, we aim at observing oxygen and carbon-rich AGB stars at high galactic latitudes with high mass-loss rates, and high-mass oxygen-rich post-AGB stars in the galactic plane. Because of sensitivity, these types of objects were completely missed in previous studies. The dust sequence resulting from this study, will not only give us insight in the formation of dust and its processing due to the hardening of the radiation field during the stellar evolution, but will also provide us with a better census of the dust injected in the interstellar medium.

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