Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..11e...7h&link_type=abstract
Pre-Solar Grains as Astrophysical Tools, 26th meeting of the IAU, Joint Discussion 11, 21 August 2006, Prague, Czech Republic, J
Astronomy and Astrophysics
Astrophysics
Scientific paper
Dust grains forming in the extended atmospheres of cool luminous giants play a crucial role in driving the massive winds observed in such stars. With their considerable opacity, they extract momentum from the radiation field and subsequently transfer it to the surrounding gas through collisions. The grains condense under non-equilibrium conditions with temperature acting as a threshold, prevailing densities and abundances determining the efficiency of grain growth, and pulsation and shock waves setting the time scales. The progress achieved during the past decade in both modelling and observations has given us valuable information about the composition of grains and insights into the conditions under which they are formed. I will summarize the current picture of grains in stellar atmospheres and winds and discuss remaining problems and challenges.
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