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(Teff,log g,[Fe/H]) Classification of Low-Resolution Stellar Spectra using Artificial Neural Networks
Shawn Snider, Yuan Qu, Carlos Allende Prieto +4
New generation large-aperture telescopes, multi-object spectrographs, and large format detectors are making it possible to acquire very large samples of stellar spectra rapidly. In…
Population III by Popular Demand - Progress and Previews
Timothy C. Beers
I discuss the ongoing search for stars of the Milky Way which have been referred to as members of Population III. Following a discussion of possible definitions for these stars, I…
Finding the First Stars: The Hamburg/ESO Objective Prism Survey
N. Christlieb, D. Reimers, L. Wisotzki +3
We report on a search for extremely metal-poor ([Fe/H]<-3.0) turnoff stars in the Hamburg/ESO objective prism survey (HES). Metal-poor stars are selected by automatic spectral clas…
Primordial Lithium and Big Bang Nucleosynthesis
S. G. Ryan, T. C. Beers, K. A. Olive +2
In the standard hot big bang nucleosynthesis (BBN) model the primordial abundances of H, H2, He3, He4, and Li7, fix the baryon density of the universe, , via the baryon-to-pho…
Abell 521: Dynamical analysis of a young cluster
S. Maurogordato, D. Proust, T. C. Beers +5
We present the results of a dynamical analysis of the rich X-Ray luminous galaxy cluster Abell 521, and discuss the nature of the arc-like structure first noted by Maurogordato et…
The Spite Lithium Plateau: Ultra-Thin but Post-Primordial
Sean G. Ryan, John E. Norris, Timothy C. Beers
We have studied 23 very metal-poor field turnoff stars, specifically chosen to enable a precise measurement of the dispersion in the lithium abundance of the Spite Li plateau. We c…