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BEGIN:VEVENT
DTSTAMP:20260627T105800Z
DTSTART;VALUE=DATE-TIME:20140521T140000
DTEND;VALUE=DATE-TIME:20140521T150000
SUMMARY:Robert Izzard (Bonn)
TZID:Europe/London
UID:20140521-094d43f54598ed7a0145d7da0fa9171c@warwick.ac.uk
CREATED:20140507T180243Z
DESCRIPTION:The Origin of the Elements and the Critical Role of Binary St
 ars In a few millennia of recorded history\, mankind has made great stri
 des in its understanding of the Universe. We now know that the Big Bang 
 created almost all visible matter as just two elements\, hydrogen and he
 lium\, some which was later turned into carbon\, oxygen\, iron and the 9
 0+ other chemical elements by nucleosynthesis in stars. Many of these st
 ars are gravitationally bound as close binary systems which can evolve q
 uite differently to single stars leading to exotic phenomena such as the
 rmonuclear novae and gamma-ray bursts. Binaries are crucial to galactic 
 chemical evolution\, particularly through type Ia supernovae which make 
 most of the iron in the Universe. By comparing statistical models of bin
 ary star populations with observations\, we can better understand many p
 rocesses in stellar astrophysics. For example\, chemically peculiar star
 s\, such as carbon-enhanced metal-poor and barium stars\, are difficult 
 to reproduce both in number and binary orbital properties with conventio
 nal stellar models. Much of my recent work has involved statistically te
 sting new theories of mass transfer and orbital interactions to explain 
 these and other unusual binary stars. Statistical methods are also predi
 ctive and I will report on new calculations of a binary-star source of t
 he most contemptuous element in the Universe: lithium. Canonical Galacti
 c chemical evolution models of lithium make too little by a factor of (a
 t least!) three. Mass ejection from binary stars offers an alternative\,
  hitherto ignored\, source of lithium which helps to solve this problem 
 but creates a few more along the way.
LOCATION:PS1.28
CATEGORIES:Astronomy Seminar
LAST-MODIFIED:20140507T180243Z
ORGANIZER;CN=Roberto Raddi:
END:VEVENT
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