Alice Quillen (Univeristy of Rochester)

Motions of stars just outside the Solar neighborhood
Wann Am 23.04.2018 von 11:00 bis 12:00
Was
  • Special Seminar
  • Kolloquium
Wo SH, Hoersaal
Termin übernehmen vCal / iCal

I will show velocity distributions constructed from distance limited subsamples of 1/2 million GALAH survey stars.  The velocitydistributions depend on metallicity, galactic longitude, and whether the stars are viewed in the Northern or Southern Galactic hemisphere. Thedifferences in the distributions imply that moving groups have velocity gradients in the Galaxy.  Their velocity vectors vary by about 10 km/s acrossdistances of only a few hundred pc.  The phase space substructures and gradients are surprising as they are more complex and stronger thanenvisioned.  I will discuss dynamical processes in the Galactic disk and how they might leave imprints in local velocity distributions