422 citations · 4.4k across the 64 of their papers we have counts for
5 papers · 2 filters
An Update on the 0Z Project
J. G. Cohen, N. Christlieb, A. McWilliam +2
We give an update on our 0Z Survey to find more extremely metal poor (EMP) stars with [Fe/H] < -3 dex through mining the database of the Hamburg/ESO Survey. We present the most ext…
Globular Cluster Abundances from High-Resolution Integrated Light Spectra, I: 47 Tuc
Andrew McWilliam, Rebecca A. Bernstein
We describe the detailed chemical abundance analysis of a high-resolution (R~35,000), integrated-light (IL), spectrum of the core of the Galactic globular cluster 47 Tuc, obtained…
New Extremely Metal-Poor Stars in the Galactic Halo
Judith G. Cohen, Norbert Christlieb, Andrew McWilliam +5
We present a detailed abundance analysis based on high resolution and high signal-to-noise spectra of eight extremely metal poor (EMP) stars with [Fe/H] < -3.5$ dex, four of which…
Calibration of the Relationship between Precipitable Water Vapor and 225 GHz Atmospheric Opacity via Optical Echelle Spectroscopy at Las Campanas Observatory
Joanna Thomas-Osip, Andrew McWilliam, M. M. Phillips +4
We report precipitable water vapor (PWV) measurements made at Las Campanas Observatory using optical spectra of H2O lines obtained with the Magellan echelle spectrograph, and calcu…
A New Type of Extremely Metal Poor Star
Judith G. Cohen, Andrew McWilliam, Norbert Christlieb +5
We present an abundance analysis for the extremely metal poor star HE1424-0241 based on high dispersion spectra from HIRES at Keck. This star is a giant on the lower red giant bran…