Constraining dust production by AGB stars and SNs with Dust Evolution Models and Observations

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Date/Time:Friday, 09 May 2014 from 4:10 pm to 5:00 pm
Location:Room 3
Contact:Massimo Marengo
Phone:515-294-2958
Channel:Astronomy
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Research talk by Svitlana Zhukovska, Max-Planck-Institut für Astronomie

AGB stars and core-collapse SNe are well-known dust factories, but their net input to the galactic dust budget has been a long-standing debate. Models of dust evolution provide a link between studies of dust production in individual stellar sources and their contribution to the galactic dust budget. I will discuss how using evolutionary dust models with various observational constraints, from the data preserved in meteorites during the solar system formation to the relation between the dust-to-gas ratio and metallicity in dwarf galaxies, can constrain dust production by stars, in particularly highly debated efficiencies of dust condensation in type II SNe. The models for dust input from AGB stars can be tested with the Magellanic Clouds, which are the first galaxies where dust mass-loss rates have been measured from the IR observations for the entire population of evolved stars. Complementary constraints on dust-forming AGB stars come from the solar neighbourhood, which conceals the information on the mass distribution of dust-forming AGB stars in the presolar grain population preserved in meteorites. Comparison of the theoretically calculated population of AGB stars with that reconstructed from meteoritic data indicates a number of discrepancies raising new questions about formation and survival of grains from massive AGB stars. In this context, I will briefly introduce an ongoing project on fates of massive AGB stars in stellar clusters.