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Star clusters as laboratories for stellar and dynamical evolution
Jason S. Kalirai, Harvey B. Richer
Open and globular star clusters have served as benchmarks for the study of stellar evolution due to their supposed nature as simple stellar populations of the same age and metallic…
The Spectral Types of White Dwarfs in Messier 4
D. Saul Davis, Harvey B. Richer, R. Michael Rich +2
We present the spectra of 24 white dwarfs in the direction of the globular cluster Messier 4 obtained with the Keck/LRIS and Gemini/GMOS spectrographs. Determining the spectral typ…
The Masses of Population II White Dwarfs
Jason S. Kalirai, D. Saul Davis, Harvey B. Richer +4
Globular star clusters are among the first stellar populations to have formed in the Milky Way, and thus only a small sliver of their initial spectrum of stellar types are still bu…
The remnants of galaxy formation from a panoramic survey of the region around M31
Alan W. McConnachie, Michael J. Irwin, Rodrigo A. Ibata +26
In hierarchical cosmological models, galaxies grow in mass through the continual accretion of smaller ones. The tidal disruption of these systems is expected to result in loosely b…