Internal kinematics of globular clusters

Andrea Bellini (Space Telescope Science Institute)
Event Date and Time: 
Mon, 2018-09-24 15:00 - 16:00
Hennings 318
Local Contact: 
Hervey Richer
Intended Audience: 

With the advent of the Gaia mission, astrometry is experiencing a renaissance. Although Gaia will make important breakthroughs in many different areas, stars in the crowded central fields of globular clusters and at the faint end of the color-magnitude diagram are out of Gaia's reach. However, the stable environment of space makes the Hubble Space Telescope (HST) an excellent astrometric tool.  Its diffraction-limited resolution allows it to distinguish and measure positions and brightnesses for faint stars all the way to the center of most globular clusters. I will present recent results from our HST-based, high-precision proper-motion analysis of Galactic globular clusters, with particular focus on kinematic differences among their multiple stellar populations.

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