127 citations · 365 across the 11 of their papers we have counts for
11 papers
Formation and Evolution of Blue Stragglers in 47 Tucanae
Javiera Parada, Harvey Richer, Jeremy Heyl +2
Blue stragglers (BSS) are stars whose position in the Color-Magnitude Diagram (CMD) places them above the main sequence turn-off (TO) point of a star cluster. Using data from the c…
Dynamical estimate of post main sequence stellar masses in 47 Tucanae
Javiera Parada, Harvey Richer, Jeremy Heyl +2
We use the effects of mass segregation on the radial distribution of different stellar populations in the core of 47 Tucanae to find estimates for the masses of stars at different…
Constraining white dwarf structure and neutrino physics in 47 Tucanae
Ryan Goldsbury, Jeremy Heyl, Harvey Richer +2
We present a robust statistical analysis of the white dwarf cooling sequence in 47 Tucanae. We combine HST UV and optical data in the core of the cluster, Modules for Experiments i…
Constraining Neutrino Cooling using the Hot White Dwarf Luminosity Function in the Globular Cluster 47 Tucanae
Bradley Hansen, Harvey Richer, Jason Kalirai +3
We present Hubble Space Telescope observations of the upper part (T_eff> 10 000 K) of the white dwarf cooling sequence in the globular cluster 47 Tucanae and measure a luminosity f…
A Measurement of Diffusion in 47 Tucanae
Jeremy Heyl, Harvey B. Richer, Elisa Antolini +4
Using images from the Hubble Space Telescope Wide-Field Camera 3, we measure the rate of diffusion of stars through the core of the globular cluster 47 Tucanae using a sample of yo…
When do stars in 47 Tucanae lose their mass?
Jeremy Heyl, Jason Kalirai, Harvey B. Richer +4
By examining the diffusion of young white dwarfs through the core of the globular cluster 47 Tucanae, we estimate the time when the progenitor star lost the bulk of its mass to bec…
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…
Proper Motions and Internal Dynamics in the Core of the Globular Cluster M71
Raminder Singh Samra, Harvey B. Richer, Jeremy S. Heyl +4
We have used Gemini North together with the NIRI-ALTAIR adaptive optics imager in the H and K bands to explore the core of the Galactic globular cluster M71 (NGC 6838). We obtained…
The Spectral Energy Distributions of White Dwarfs in 47 Tucanae: The Distance to the Cluster
K. A. Woodley, R. Goldsbury, J. S. Kalirai +13
We present a new distance determination to the Galactic globular cluster 47 Tucanae by fitting the spectral energy distributions of its white dwarfs to pure hydrogen atmosphere whi…
The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters
Ryan Goldsbury, Harvey B. Richer, Jay Anderson +3
We present new measurements of the centers for 65 Milky Way globular clusters. Centers were determined by fitting ellipses to the density distribution within the inner $2\arcmin$ o…