Betelgeuse Workshop 2012

26-29 nov. 2012
Observatoire de Paris, Salle de l'Atelier - Paris (France)

Mass-loss from evolved massive stars is a major contributor to the chemical enrichment of the interstellar medium, the Galaxy, and ultimately the Universe. To have a clear view of their cosmic impact, it is essential to understand their physics, from the photosphere to the interstellar medium (ISM). The violent convective motions, low surface gravity, and high luminosity combine to trigger an intense stellar wind. As the distance from the star increases, the ejected material forms molecules, then dust particles. But this general picture is still fragmentary. For instance, the structure of the convection, the composition and molecular content of the wind, the role of the magnetic field, or the chemical evolution of dust particles (surface chemistry, growth of dust grains, ...) remain poorly known. Thanks to its proximity and brightness, Betelgeuse is a particularly important fiducial object to study in details the physical phenomena at play in red supergiants (RSGs). Impressive progress has been made recently on our understanding of this star, thanks to new observations (VLT, Herschel, VLA, ...), and important advances in theory and numerical simulations (3D hydro convection simulations, mass loss models, ...). The goal of the workshop is to assemble a comprehensive description of the different regions constitutive of Betelgeuse, to study evidence for how the different regions interact with each other, and finally to understand how objects of this class are functioning. We aim at a genuine workshop format with many opportunities for exchanges between about 50 participants who actively carry out researches on Betelgeuse, and/or on similar objects. The workshop venue will be at Paris Observatory. During four days, about 30 oral contributions and 20 posters will be presented and discussed. The posters will be exhibited during the whole workshop. All contributions will be published in a book of proceedings. Overview/review contributions, synthesis of past progresses, and new observational and modeling results are equally appropriate for this workshop. Prospective participants are invited to send a title and an abstract related to topical sessions. Each session will start with an invited overview talk. The scientific organizing committee will select contributions and posters so that the topics in each session are well balanced. The registration fees (150 euros) will include coffee breaks, a visit to the Cassini exhibit, a copy of the proceedings, and a social event. A second announcement with a preliminary programme will be issued in June 2012.
Discipline scientifique : Astrophysique stellaire et solaire

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