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Dust properties in the circumstellar shells of evolved stars: Observational constraints from ISO and Spitzer infrared spectroscopy

Published online by Cambridge University Press:  01 February 2008

P. García-Lario ,
J. V. Perea Calderón ,
D. A. García-Hernández ,
L. Stanghellini ,
D. Engels ,
A. Manchado ,
J. E. Davies ,
E. Villaver ,
R. A. Shaw  and
M. Bobrowsky
P. García-Lario
Affiliation:
Herschel Science Centre, European Space Astronomy Centre, ESA, Madrid, Spain email: Pedro.Garcia-Lario@sciops.esa.int
J. V. Perea Calderón
Affiliation:
European Space Astronomy Centre, ESA, Madrid, Spain
D. A. García-Hernández
Affiliation:
Instituto de Astrofísica de Canarias, Tenerife, Spain
L. Stanghellini
Affiliation:
NOAO, Tucson, AZ, USA
D. Engels
Affiliation:
Hamburger Sternwarte, Germany
A. Manchado
Affiliation:
Instituto de Astrofísica de Canarias, Tenerife, Spain
J. E. Davies
Affiliation:
NOAO, Tucson, AZ, USA
E. Villaver
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA
R. A. Shaw
Affiliation:
NOAO, Tucson, AZ, USA
M. Bobrowsky
Affiliation:
Computer Science Corporation / Space Telescope Science Institute, Baltimore, MD, USA
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Abstract

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We present the results of a systematic analysis of the solid state features identified in the circumstellar environments of a large sample of evolved stars with ISO/SWS and Spitzer/IRS spectroscopy. The sample includes several hundred stars with a wide variety of progenitor masses evolving from the early AGB phase to the PN stage. Our observations are used to propose an evolutionary scheme in which the results obtained can be interpreted as a consequence of the nucleosynthesis processes that take place in this short phase of the stellar evolution, in particular the third dredge-up and hot bottom burning, which in turn are also strongly modulated by the stellar metallicity.

Keywords

Circumstellar matterstars: AGB and post-AGBplanetary nebulae
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 217 - 218
Copyright
Copyright © International Astronomical Union 2008