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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1787
DTSTART:20100205T203000Z
DTEND:20100205T221500Z
DTSTAMP:20260405T194127Z
LAST-MODIFIED:20100202T190628Z
LOCATION:3425 Sterling Hall
SUMMARY:Breaching the Eddington Limit in the Most Massive\, Most Lumin
 ous Stars"\, SPECIAL ASTRONOMY TALK\, Professor Stan Owocki\, Universi
 ty of Delaware
DESCRIPTION:Basic stellar structure dictates that stars of ca. 100 Msu
 n or more will be close to the Eddington limit\, with luminosities in 
 excess of 106 Lsun\, and radiation pressure contributing prominently t
 o interior support against gravity. Although it is formally possible t
 o generate static structure models of even more massive stars\, extens
 ive observational surveys of massive stellar clusters suggest an upper
  stellar mass limit of ca. 140 Msun. This talk will focus on the role 
 of extreme mass loss in limiting the masses of stars\, emphasizing in 
 particular that continuum driving\, possibly associated with structura
 l instabilities of radiation dominated envelope\, can lead to much str
 onger mass loss than is possible by the usual line-scattering mechanis
 m of steady stellar winds. I will also discuss the implications for th
 e evolution of the most massive stars\, including Luminous Blue Variab
 les (LBVs)\, the first stars and GRB progenitors.<br>
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URL:https://www.physics.wisc.edu/events/?id=1787
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