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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1011
DTSTART:20080131T180000Z
DURATION:PT1H0M0S
DTSTAMP:20260423T072248Z
LAST-MODIFIED:19700101T060000Z
LOCATION:6515 Sterling Hall (coffee at 11:30 am in 6521 Sterling)
SUMMARY:Not Your Grandmother's HII Regions: An X-ray Tour of Massive S
 tar- forming Regions\, Astronomy Colloquium\, Leisa Townsley\, Penn St
 ate
DESCRIPTION:The Chandra X-ray Observatory is providing remarkable new 
 views of massive star-forming regions\, revealing all stages in the li
 fe cycle of high-mass stars and their effects on their surroundings. W
 e will tour several such regions\, highlighting physical processes tha
 t characterize the life of a cluster of massive stars\, from deeply- e
 mbedded cores too young to have established an HII region to superbubb
 les so large that they shape our views of galaxies. Along the way we s
 ee that X-ray observations reveal hundreds of pre-main sequence stars 
 accompanying the massive stars that power great HII region complexes. 
 The most massive stars themselves are often anomalously hard X-ray emi
 tters\; this may be a new indicator of close binarity or strong magnet
 ic fields. These complexes are sometimes suffused by diffuse X-ray str
 uctures\, signatures of multi-million- degree plasmas created by fast 
 O-star winds. In older regions we see the X-ray remains of the deaths 
 of massive stars that stayed close to their birthplaces\, exploding as
  cavity supernovae within the superbubbles that these clusters created
 .
URL:https://www.physics.wisc.edu/events/?id=1011
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