Seminars and Colloquia at ESO/Santiago

For ESO and ESO-related Conferences and Workshops in Europe and Chile please check the main Conferences and Workshops page.


Broadcast of the ESO talks is available upon request.  If anyone is interested, kindly contact us via email
at least 60 min prior  to the beginning of the talk.


June 2015

30.06.15 (Tuesday)
12:00
"The circumstellar environment of evolved stars at high angular resolution"
Miguel MONTARGES (IRAM, Grenoble)
Abstract
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"The circumstellar environment of evolved stars at high angular resolution"

Miguel MONTARGES (IRAM, Grenoble)

Abstract

Chemical enrichment of the Galaxy, and ultimately of the Universe is caused by evolved stars. Nuclear fusion is producing heavy elements in their interior which are moved to the surface thanks to large convective motions. Pulsating models of AGB stars can correctly explain how the evolved material is expelled from the photosphere to the circumstellar environment, and how dust condensates. However, it cannot account for the bipolar structure of many planetary nebulae. We manage to directly image the dust scattering by a disk around the close AGB star L2 Puppis with VLT/NACO and of its stellar companion with VLT/SPHERE. This will help understanding the shaping of planetary nebulae of the hourglass type. On the massive star side, no scenario account for the the triggering of the mass loss of red supergiant stars (RSG) as they are not experiencing pulses nor flares. I will review our recent observations of the close environment of the nearest RSG star, Betelgeuse.


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