Mass-loss from evolved stars: morphology and effect of metallicity

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• Éric Lagadec, University of Manchester
• Monday 11 May 2009, 16:00-17:00
• MR14, DAMTP, Pav. F.

If you have a question about this talk, please contact Dr. Aurélien Crida.

The mass-loss from AGB stars is very important for the stellar evolution and the chemical evolution of galaxies. The effect of metallicity on this mass-loss is not well understood, as well as the mechanisms responsible for the morphological changes observed during the transition from the AGB to the planetary nebulae phase, where a globally spherical AGB star can form an elliptic, bipolar or multipolar planetary nebula.

During the first part of my talk I will present new results about the effect of metalllicity on the dust composition and mass-loss rates of AGB stars, mainly based on Spitzer observations of mass-losing AGB stars in the Local Group. I will also present some results about the detection of carbon-rich dust around an AGB star with primitive abundances. This raises the possibility that carbon stars contributed carbonaceous dust in the early universe.

I will finish by presenting some interesting results for the understanding of the shaping of planetary nebulae, such as e.g. the detection of dusty discs in the core of these objects, obtained using high angular resolution observations with the VLT /VLTI.

This talk is part of the DAMTP Astrophysics Seminars series.

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