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Comparing the White Dwarf Cooling Sequences in 47 Tuc and NGC 6397
Harvey B. Richer, Ryan Goldsbury, Jeremy Heyl +7
Using deep Hubble Space Telescope imaging, color-magnitude diagrams are constructed for the globular clusters 47 Tuc and NGC 6397. As expected, because of its lower metal abundance…
Quantifying mass segregation and new core radii for 54 milky way globular clusters
Ryan Goldsbury, Jeremy Heyl, Harvey Richer
We present core radii for 54 Milky Way globular clusters determined by fitting King-Michie models to cumulative projected star count distributions. We find that fitting star counts…
An Age Difference of 2 Gyr between a Metal-Rich and a Metal-Poor Globular Cluster
B. M. S. Hansen, J. S. Kalirai, J. Anderson +9
Globular clusters trace the formation history of the spheroidal components of both our Galaxy and others, which represent the bulk of star formation over the history of the univers…
A Dynamical Signature of Multiple Stellar Populations in 47 Tucanae
Harvey B. Richer, Jeremy Heyl, Jay Anderson +5
Based on the width of its main sequence, and an actual observed split when viewed through particular filters, it is widely accepted that 47 Tucanae contains multiple stellar popula…