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56 papers · 2 filters
HST/NICMOS observations of the GLIMPSE9 stellar cluster
Maria Messineo, Donald F. Figer, Ben Davies +4
We present HST/NICMOS photometry, and low-resolution K-band spectra of the GLIMPSE9 stellar cluster. The newly obtained color-magnitude diagram shows a cluster sequence with H-Ks =…
The bottom of the white dwarf cooling sequence in the old open cluster NGC 2158
L. R. Bedin, M. Salaris, I. R. King +3
We use 10 orbits of Advanced Camera for Surveys observations to reach the end of the white dwarf cooling sequence in the solar-metallicity open cluster NGC 2158. Our photometry and…
The Presence of Two Distinct Red Giant Branches in the Globular Cluster NGC 1851
Sang-Il Han, Young-Wook Lee, Seok-Joo Joo +4
There is a growing body of evidence for the presence of multiple stellar populations in some globular clusters, including NGC 1851. For most of these peculiar globular clusters, ho…
HST's hunt for intermediate-mass black holes in star clusters
Julio Chanamé, Justice Bruursema, Rupali Chandar +3
Establishing or ruling out, either through solid mass measurements or upper limits, the presence of intermediate-mass black holes (IMBHs) at the centers of star clusters would prof…
Chemical Evolution in Hierarchical Models of Cosmic Structure II: The Formation of the Milky Way Stellar Halo and the Distribution of the Oldest Stars
Jason Tumlinson
This paper presents theoretical star formation and chemical enrichment histories for the stellar halo of the Milky Way based on new chemodynamical modeling. The goal of this study…
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…