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SUMMARY:Primordial Star Formation  - Professor Ralf Klessen\, Heidelberg U
 niversity 
DTSTART:20230330T150000Z
DTEND:20230330T160000Z
UID:TALK198784@talks.cam.ac.uk
CONTACT:Please see programme below
DESCRIPTION:The first generation of stars\, often called Population III (o
 r Pop III)\, form from metal-free primordial gas at redshifts z ~ 30 and b
 elow. They dominate the cosmic star formation history until z ~ 20-15\, at
  which point the formation of metal-enriched Pop II stars takes over. I re
 view current theoretical models for the formation\, properties and impact 
 of Pop III stars\, and discuss observational constraints. I argue that pri
 mordial gas is highly susceptible to fragmentation and Pop III stars form 
 as members of small clusters with a logarithmically flat mass function. Fe
 edback from massive Pop III stars plays a central role in regulating subse
 quent star formation\, but major uncertainties remain regarding its immedi
 ate impact. Direct observations of Pop III stars in the early Universe rem
 ain extremely challenging\, whereas stellar archeological surveys allow us
  to constrain both the low-mass and the high-mass ends of the Pop III mass
  distribution. Observations suggest that most massive Pop III stars end th
 eir lives as core-collapse supernovae rather than as pair-instability supe
 rnovae.
LOCATION:Hoyle Lecture Theatre\, Institute of Astronomy\, Madingley Rise
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