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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20180123T123000
DTEND;TZID=Atlantic/Canary:20180123T133000
UID:iactalks-1122
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1122
CREATED:2018-01-23T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The Pristine survey: An efficient search for extremely metal-poor s
 tars
DESCRIPTION:The Pristine survey: An efficient search for extremely metal-po
 or stars\nDr. Kris Youakim\n\nThe most metal-poor stars in the Galaxy are 
 relics from the first generations of star formation, and their properties 
 can reveal key information about the formation and evolution of the Milky 
 Way. However, only a small number of these extremely rare stars are curren
 tly known, due to the difficulty in finding them amongst the overwhelmingl
 y more abundant stars of higher metallicity. In this talk, I will present 
 the Pristine survey, a narrow-band photometric survey in the wavelength re
 gion around the Ca H&K absorption lines designed to efficiently search
  for extremely metal-poor (EMP) stars. In the first three years of the sur
 vey, we have covered ~2,500 square degrees of sky in the Northern hemisphe
 re using the CFHT on Mauna Kea in Hawaii, as well as a sizeable spectrosco
 pic follow-up sample using mostly the INT and WHT in La Palma. With this d
 ata, we have demonstrated success rates of 70% for finding stars with [Fe/
 H] < -2.5, and 22% for stars with [Fe/H] < -3.0. This represents a s
 ignificant improvement upon previous searches for EMP stars, which have re
 ported success rates of 3-4%. With this efficiency, the Pristine survey is
  poised to make a significant contribution to constraining the metal-poor 
 tail of the metallicity distribution function, as well as increasing the n
 umber of known ultra metal-poor (UMP) stars in the literature. In addition
 , I will discuss how the Pristine survey is being used to characterise the
  faint dwarf galaxy population, and analyse substructure in the Galactic H
 alo.
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