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Project AMIGA: Distance and Metallicity Gradients Along Andromeda's Giant Southern Stream from the Red Clump
Roger E. Cohen, Jason S. Kalirai, Karoline M. Gilbert +7
The Giant Southern Stream (GSS) of M31, a keystone signature of a major accretion event, yields crucial constraints on M31 formation and evolution models. Currently, our understand…
The White Dwarf Initial-Final Mass Relation for Progenitor Stars From 0.85 to 7.5 M
Jeffrey D. Cummings, Jason S. Kalirai, P. -E. Tremblay +2
We present the initial-final mass relation (IFMR) based on the self-consistent analysis of Sirius B and 79 white dwarfs from 13 star clusters. We have also acquired additional sign…
Improved Main Sequence Turnoff Ages of Young Open Clusters: Multicolor UBV Techniques & the Challenges of Rotation
Jeffrey D. Cummings, Jason S. Kalirai
Main sequence turnoff ages in young open clusters are complicated by turnoffs that are sparse, have high binarity fractions, can be affected by differential reddening, and typicall…
The Age of the Old Metal-Poor Globular Cluster NGC6397 Using WFC3/IR Photometry
Matteo Correnti, Mario Gennaro, Jason S. Kalirai +2
Globular Clusters (GCs) in the Milky Way represent the ideal laboratory to establish the age of the oldest stellar populations and to measure the color-magnitude relation of stars.…
A Multi-Mass Velocity Dispersion Model of 47 Tucanae Indicates No Evidence for an Intermediate Mass Black Hole
Christopher Mann, Harvey Richer, Jeremy Heyl +6
In this paper, we analyze stellar proper motions in the core of the globular cluster 47 Tucanae to explore the possibility of an intermediate-mass black hole (IMBH) influence on th…
Deep Hubble Space Telescope Imaging of Globular Clusters Towards the Galactic Bulge: Observations, Data Reduction and Color-Magnitude Diagrams
Roger E. Cohen, Francesco Mauro, Javier Alonso-García +5
The Galactic globular clusters (GGCs) located towards the Galactic bulge have generally been excluded from large-scale photometric GGC surveys due to severe total and differential…