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Dust Formation and Winds around Evolved Stars The Good, the Bad and the Ugly Cases
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
2009 (English)In: COSMIC DUST - NEAR AND FAR / [ed] Henning T, Grun E, Steinacker J, 2009, Vol. 414, 3-21 p.Conference paper, Published paper (Refereed)
Abstract [en]

Cool luminous giants, in particular asymptotic giant branch stars, are among the most important sources of cosmic dust Their extended dynamical atmospheres are places where grains form and initiate outflows driven by radiation pressure, leading to considerable stellar mass loss and the enrichment of the interstellar medium with newly-produced elements This review summarizes the current understanding of dust formation and winds in such stars, sketching a system of criteria for identifying crucial types of dust grains in the range of possible condensates Starting with an overview of the specific conditions for dust formation in cool dynamic atmospheres, the role of grains as wind drivers, as well as their influence on observable properties of cool giants and the circum-stellar environment is discussed in some detail Regarding the literature, special attention is given to current developments, e g, the debate concerning the Fe-content and size of silicate grains in M-type AGB stars which are critical issues for the wind mechanism, or recent advances in spatially resolved observations and 3D modeling of giants and their dusty envelopes

Place, publisher, year, edition, pages
2009. Vol. 414, 3-21 p.
Series
Astronomical Society of the Pacific Conference Series, 414
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-140145ISI: 000284979000001ISBN: 978-1-58381-708-7 (print)OAI: oai:DiVA.org:uu-140145DiVA: diva2:383144
Conference
International Conference Cosmic Dust Near and Far HeidelBerg, GERMANY, SEP 08-12, 2008
Available from: 2011-01-04 Created: 2011-01-04 Last updated: 2012-10-11Bibliographically approved

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Höfner, Susanne

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