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Direct Evidence for an Enhancement of Helium in Giant Stars in Omega Centauri
A. K. Dupree, Jay Strader, Graeme H. Smith
The double main sequence identified in the globular cluster Omega Centauri has been interpreted using isochrones to indicate a large variation in the abundance of helium. If true,…
An optical/NIR survey of globular clusters in early-type galaxies II. Ages of GC systems and the relation to galaxy morphology
A. L. Chies-Santos, S. S. Larsen, H. Kuntschner +5
Context: Some photometric studies of extragalactic globular cluster (GC) systems using the optical and near-infrared colour combination have suggested the presence of a large fract…
An optical/NIR survey of globular clusters in early-type galaxies. I. Introduction and data reduction procedures
A. L. Chies-Santos, S. S. Larsen, E. M. Wehner +3
Context: The combination of optical and near-infrared (NIR) colours has the potential to break the age/metallicity degeneracy and offers a better metallicity sensitivity than optic…
Radio pulsar populations
D. R. Lorimer
The goal of this article is to summarize the current state of play in the field of radio pulsar statistics. Simply put, from the observed sample of objects from a variety of survey…
Willman 1 - a probable dwarf galaxy with an irregular kinematic distribution
Beth Willman, Marla Geha, Jay Strader +4
We investigate the kinematic properties and stellar population of the Galactic satellite Willman 1 (Wil 1) by combining Keck/DEIMOS spectroscopy with KPNO mosaic camera imaging. Wi…
Deriving Metallicities From the Integrated Spectra of Extragalactic Globular Clusters Using the Near-Infrared Calcium Triplet
Caroline Foster, Duncan A. Forbes, Robert N. Proctor +3
The Ca triplet (CaT) feature in the near-infrared has been employed as a metallicity indicator for individual stars as well as integrated light of Galactic globular clusters (GCs)…