15 citations · 15 across the 5 of their papers we have counts for
10 papers
Discovery of an extended halo of metal-poor stars in the Andromeda spiral galaxy
Puragra Guhathakurta, James C. Ostheimer, Karoline M. Gilbert +5
Understanding galaxy formation involves look-back and fossil-record studies of distant and nearby galaxies, respectively. Debris trails in our Galaxy's spheroidal halo of old stars…
The Dearth of Massive, Helium-Rich White Dwarfs in Young Open Star Clusters
Jasonjot Singh Kalirai, Harvey B. Richer, Brad M. S. Hansen +2
Spectra have been obtained of 21 white dwarfs (WDs) in the direction of the young, rich open star cluster NGC 2099. This represents an appreciable fraction (>30%) of the cluster's…
HST Observations of the Main Sequence of M4
H. B. Richer, G. G. Fahlman, J. Brewer +8
This paper presents new results from a photometric study of the main-sequence stars in M4, the closest globular cluster to the sun. Multi-field, multi-epoch observations at approxi…
Composition of the Galactic bulge
Andrew McWilliam, R. Michael Rich
We present detailed abundance results for 9 Galactic bulge stars in Baade's Window, based on HIRES (R=45,000--60,000) spectra taken with the Keck I telescope. The alpha elements sh…
Correlations of Globular Cluster Properties: Their Interpretations and Uses
S. G. Djorgovski, P. Cote, G. Meylan +7
Correlations among the independently measured physical properties of globular clusters (GCs) can provide powerful tests for theoretical models and new insights into their dynamics,…
The Age of the Galactic Bulge
R. Michael Rich
The dominant stellar population of the central bulge of the Milky Way is old, with roughly solar metallicity. The age is very similar to that of the old metal rich bulge globular c…