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The Bright, Turbulent and Short Life of the Most Massive Stars - Dr. Andr�-Nicolas Chen�, HIA Post Doctorate with Gemini Program - presented at the March 10, 2010 monthly meeting of RASC Victoria Centre. In spite of their rarity, the most massive stars dominate the luminosity and the dynamic of star-forming galaxies. They contribute large amounts of energy, momentum and matter to the ecology, making them crucial constituent of the universe. I will describe the stages of the life of the most massive stars, from the Main Sequence, i.e. just after their birth, to the Wolf-Rayet stage, i.e. just before their death in supernova. I will also present the theoretical and observational efforts deployed in the last decade and the biggest challenges for the next one. Presentation (1.4Mb pdf) - please right click & "Save as..." Biography: I have completed a PhD in Astrophysics at the Universite de Montreal under the supervision of Nicole St-Louis. My thesis about the observational determination of the rotation rate of Wolf-Rayet stars. In November 2007, I moved to Victoria and I started a postdoctoral fellowship with the Canadian Gemini Office at the Herzberg Institute of Astrophysics. I am currently looking for a second postdoctoral position. Site web d'Andr�-Nicolas Chen� SPACE.com -- Most Massive Star in Class By Itself Postscript from Andr�-Nicolas:
I had many question about what is the largest known star. Here is what I found:
The derived radii for VY Canis Majoris are between 1800 and 3000(!) Solar Radii
(reference).
Also, according to (reference),
the radius of WOH G64 should be pretty much the same, i.e. ~8AU~1800 SolRad.
Finally, (reference)
finds something like 1200 to 1650 SolRad for VV Cephei.
All these radii have been determined with either interferometry,
asteroseismology (pulsations), eclipse with the moon, brief, many different
methods that have their limits.
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