TY  - GEN
AV  - public
Y1  - 2008///
TI  - Dust formation by stars and evolution in the interstellar medium
KW  - dust origin 
KW  -  dust evolution 
KW  -  SN dust 
KW  -  AGB dust 
KW  -  chemical evolution model 
KW  -  Milky May
ID  - heidok9131
A1  - Zhukovska, Svitlana
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/9131/
N2  - The main goal of this thesis is the study of the origin and evolution of interstellar dust in the Milky Way. We develop a model for the chemical evolution of the galactic disk as a basis for our new model of dust evolution, which considers for the first time the individual evolutions of stardust and of dust condensed in molecular clouds of the Galactic disk. We include dust production by AGB stars in detail, using the results of synthetic AGB models combined with models of dust condensation in stellar outflows, and estimate the efficiency of dust condensation in supernovae by matching model results for the Solar neighbourhood with observed abundances of presolar dust grains of supernova origin. Our results indicate that supernovae produce mainly carbon dust, with only small amounts of silicates, iron and silicon carbonate. We show that the interstellar dust population is dominated by dust grown in the interstellar medium across the Galactic history; moreover, dust formed in AGB stars and supernovae is a dominant source of dust only at metallicities lower than the minimal value for efficient dust growth in molecular clouds.
ER  -