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SUMMARY:Stellar Archaeology: New Science with Old stars - Anna Frebel (cfa
 )
DTSTART:20110412T143000Z
DTEND:20110412T153000Z
UID:TALK30828@talks.cam.ac.uk
CONTACT:Alis Deason
DESCRIPTION:The early chemical evolution of the Galaxy and the Universe is
 \nvital to our understanding of a host of astrophysical phenomena.\nSince 
 the most metal-poor Galactic stars are relics from the\nhigh-redshift Univ
 erse\, they probe the chemical and dynamical\nconditions as the Milky Way 
 began to form\, the origin and evolution of\nthe elements\, and the physic
 s of nucleosynthesis.  They also provide\nconstraints on the nature of the
  first stars\, their associated\nsupernovae and initial mass function\, an
 d early star and galaxy\nformation.  I will discuss examples of the most m
 etal-poor Galactic\nstars with extreme and unusual abundance patterns that
  can help\nelucidate the supernovae responsible for their chemical signatu
 res.\nFurthermore\, stars displaying a strong overabundance of the heavies
 t\nelements\, in particular uranium and thorium\, can be radioactively\nda
 ted\, giving formation times ~13 Gyr ago\, similar to the ~13.7 Gyr\nage o
 f the Universe. I then transition to a description of recent\ndiscoveries 
 of extremely metal-poor stars in dwarf satellites of the\nMilky Way.  Thei
 r stellar chemical signatures support the concept that\nsmall systems anal
 ogous to the surviving dwarf galaxies were the\nbuilding blocks of the Mil
 ky Way's low-metallicity halo.  This opens a\nnew window for studying gala
 xy formation through stellar chemistry.\n
LOCATION:HCR\, IoA
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