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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20141127T103000
DTEND;TZID=Atlantic/Canary:20141127T113000
UID:iactalks-689
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/689
CREATED:2014-11-27T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Pulsations in massive stars
DESCRIPTION:Pulsations in massive stars\nDr. Melanie Godart\n\n\n\n\nMassiv
 e                 stars shape and drive our Universe. Many issues         
         such as their formation, their stability and the mass             
     loss effects for example, are nowadays far                 for being c
 ompletely understood. To improve our                 understanding, astero
 seismology provides a                 powerful tool and excellent results 
 have been obtained                 over the last years. Recent ground-base
 d                 and space observations have shown the presence of       
           pulsations in massive main sequence and post-main               
   sequence                 stars, such as acoustic and gravity modes excit
 ed by the kappa-mechanism and even solar-like                 oscillations
 . Theoretical studies emphasized the                 presence of strange m
 odes in massive models,                 excited by the strange mode instab
 ility mechanism.                 Moreover, recent theoretical analyses hav
 e                 shown that hot supergiants can also pulsate in          
        oscillatory convective modes propagating in the                 sup
 erficial layers of these stars. I will expose here                 the ins
 tability domains of massive                 stars as well as their excitat
 ion mechanisms and present                 the latest results in the domai
 n. \n\n\n
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