BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:(Ex-?)Binary stars in the Galactic thick disc - Dr. Robert Izzard 
 (University of Cambridge)
DTSTART:20170426T124500Z
DTEND:20170426T131500Z
UID:TALK72071@talks.cam.ac.uk
CONTACT:Quentin Kral
DESCRIPTION:Recent studies of old stars in the Galactic thick disc suggest
  it contains a population of “young” giant stars. These are chemically
  and kinematically members of the thick disc\, but their masses – measur
 ed by asteroseismology – are up to a factor of two greater than expected
  given the age of the thick disc. Galactic astronomers have suggested they
  come from a population of stars that have migrated from the bar of the Ga
 laxy. Because migration away from a bar is anathema to us\, we show that t
 hey could instead be (ex-?)binary stars. These stars have undergone mass t
 ransfer\, a process similar to that which forms blue stragglers in globula
 r clusters\, or they have merged. Through the carbon–to–nitrogen ratio
  we relate stellar surface chemistry to stellar mass using single and bina
 ry star models. The latter match the observations far better than we could
  have expected. We also predict binary fractions and other properties of t
 hese “young” stars ready for comparison with ongoing and upcoming obse
 rvational programmes.
LOCATION:Sackler Lecture Theatre\, IoA
END:VEVENT
END:VCALENDAR