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Title:
Dust properties in the circumstellar shells of evolved stars: Observational constraints from ISO and Spitzer infrared spectroscopy
Authors:
García-Lario, P.; Calderón, J. V. Perea; García-Hernández, D. A.; Stanghellini, L.; Engels, D.; Manchado, A.; Davies, J. E.; Villaver, E.; Shaw, R. A.; Bobrowsky, M.
Affiliation:
AA(Herschel Science Centre, European Space Astronomy Centre, ESA, Madrid, Spain ), AB(European Space Astronomy Centre, ESA, Madrid, Spain), AC(Instituto de Astrofísica de Canarias, Tenerife, Spain), AD(NOAO, Tucson, AZ, USA), AE(Hamburger Sternwarte, Germany), AF(Instituto de Astrofísica de Canarias, Tenerife, Spain), AG(NOAO, Tucson, AZ, USA), AH(Space Telescope Science Institute, Baltimore, MD, USA), AI(NOAO, Tucson, AZ, USA), AJ(Computer Science Corporation / Space Telescope Science Institute, Baltimore, MD, USA)
Publication:
Organic Matter in Space, Proceedings of the International Astronomical Union, IAU Symposium, Volume 251, p. 217-218
Publication Date:
10/2008
Origin:
CUP
Keywords:
Circumstellar matter, stars: AGB and post-AGB, planetary nebulae
DOI:
10.1017/S1743921308021601
Bibliographic Code:
2008IAUS..251..217G

Abstract

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.
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