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SUMMARY:Mass-loss from evolved stars: morphology and effect of metallicity
  - Éric Lagadec\, University of Manchester
DTSTART:20090511T150000Z
DTEND:20090511T160000Z
UID:TALK18197@talks.cam.ac.uk
CONTACT:Dr. Aurélien Crida
DESCRIPTION:The mass-loss from AGB stars is very important for the stellar
  evolution and the chemical evolution of galaxies. The effect of metallici
 ty on this mass-loss is not well understood\, as well as the mechanisms re
 sponsible for the morphological changes observed during the transition fro
 m the AGB to the planetary nebulae phase\, where a globally spherical AGB 
 star can form an elliptic\, bipolar or multipolar planetary nebula.\n\nDur
 ing 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 Loca
 l Group. I will also present some results about the detection of carbon-ri
 ch dust around an AGB star with primitive abundances. This raises the poss
 ibility that carbon stars contributed carbonaceous dust in the early unive
 rse.\n\nI will finish by presenting some interesting results for the under
 standing 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.
LOCATION:MR14\, DAMTP\, Pav. F
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