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SUMMARY:Reconstructing the History of the Milky Way Galaxy Using Stars - M
 elissa Ness\, Research School of Astronomy and Astrophysics (RSAA)\, Austr
 alian National University\, Canberra\, Australia
DTSTART:20250313T160000Z
DTEND:20250313T170000Z
UID:TALK226681@talks.cam.ac.uk
CONTACT:88984
DESCRIPTION:Astronomy of the Milky Way Galaxy has entered a transformative
  era. The Gaia mission and an ensemble of ground-based spectroscopic surve
 ys are delivering element abundances and velocities for millions of stars.
  These data provide both an opportunity to deepen our understanding of gal
 axy formation and to test the “limits of knowledge.” There have been s
 everal surprises that have come out of the large stellar surveys and data-
 driven methodologies built to analyse them. We have learned that up to 1 i
 n 100 stars in the disk are “abundance doppelgangers” – chemically i
 dentical but unrelated – limiting the prospect of reconstructing the dis
 k’s star cluster building blocks. Furthermore\, for stars in the disk\, 
 most of the element abundances measured for most of the stars can be predi
 cted to a precision of better than 10 percent given only two key abundance
 s. However\, this is not the case for stars in the stellar halo. These fin
 dings frame how we can most effectively work with the data to turn photons
  into a quantified description of Galactic history and provide strong cons
 traints on the star formation and mixing processes that have set the Galac
 tic environment.
LOCATION:Hoyle Lecture Theatre\, IoA (tea at 3:30 pm)
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