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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1852
DTSTART:20100427T203000Z
DTEND:20100427T220000Z
DTSTAMP:20260413T101628Z
LAST-MODIFIED:20100420T135726Z
LOCATION:3425 Sterling Hall
SUMMARY:The Nova Outburst: Evidence for a New Paradigm?\, Astronomy Co
 lloquium\, Dr. Robert Williams\, STSci
DESCRIPTION:Spectroscopic observations of novae date back a century an
 d the fundamental nature of the outburst has been understood for 50 ye
 ars. Yet\, recent observations suggest a possible significant modifica
 tion to the standard nova paradigm. A high-resolution spectroscopic su
 rvey of novae has revealed short-lived heavy element absorption system
 s near maximum light consisting of Fe-peak and s-process elements. The
  spectroscopic evolution of novae is interpreted in terms of two disti
 nct interacting gas systems in which the bright continuum is produced 
 by the outburst ejecta but absorption and emission lines originate in 
 gas ejected by the secondary star in a way that could explain dust for
 mation and X-ray emission from novae. The absorbing gas is circumbinar
 y and it pre-exists the outburst. Its origin appears to be mass ejecti
 on from the accretion disk or secondary star\, and it might initiate n
 ovae outbursts.
URL:https://www.physics.wisc.edu/events/?id=1852
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