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SUMMARY:Dynamical properties of ancient stars in the inner Milky Way with 
 PIGS
DTSTART;VALUE=DATE-TIME:20230320T164000Z
DTEND;VALUE=DATE-TIME:20230320T165500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115719Z
UID:indico-contribution-195@meetings.aip.de
DESCRIPTION:Speakers: Anke Arentsen (Institute of Astronomy\, Cambridge)\n
 The oldest\, most metal-poor stars in the Milky Way are unique probes of e
 arly star formation and the assembly of the Milky Way. The Galactic bulge 
 region has typically been avoided in the search for metal-poor stars\, bec
 ause of the extremely high density of mostly metal-rich stars and the high
  dust extinction. The bulk of the Galactic bulge is thought to originate f
 rom the (early) Galactic disk. However\, the oldest pressure-supported com
 ponent in our Galaxy is also expected to be present in its innermost regio
 n. The most metal-poor stars in the bulge region can provide unique insigh
 ts into the ancient Milky Way. \n\nI will present results from the Pristin
 e Inner Galaxy Survey (PIGS)\, which used metallicity-sensitive narrow-ban
 d CaHK photometry to identify and follow up spectroscopically thousands of
  metal-poor candidates in the bulge. Using the bulk PIGS radial velocities
 \, we previously showed that the amount of inner Galaxy rotation decreases
  with decreasing metallicity. I will present recent work on the detailed o
 rbital properties for all stars in PIGS\, which strongly depend on their m
 etallicities and broadly show a transition from a disky bulge to a pressur
 e-supported component. It is exciting to see the growing amount of data on
  metal-poor stars in the inner regions of the Milky Way\, thanks to variou
 s surveys\, allowing us to set important constraints on the formation of t
 he ancient inner Galaxy.\n\nhttps://meetings.aip.de/event/20/contributions
 /195/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/195/
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