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Mapping the Galactic Halo III. Simulated Observations of Tidal Streams
Paul Harding, Heather L. Morrison, Edward W. Olszewski +5
We have simulated the evolution of tidal debris in the Galactic halo in order to guide our ongoing survey to determine the fraction of halo mass accreted via satellite infall. Cont…
Mapping the Galactic Halo IV. Finding Distant Giants Reliably with the Washington System
H. L. Morrison, E. W. Olszewski, M. Mateo +4
We critically examine the use of the Washington photometric system (with the 51 filter) for identifying distant halo giants. While this is the most powerful photometric technique f…
s- and r-process elements in two very metal-poor stars
Sean G. Ryan, Wako Aoki, Lisa A. J. Blake +5
New measurements of neutron-capture elements are presented for two very metal-poor stars ([Fe/H] ~ -3). One (LP 625-44) has an s-process signature believed to be due to mass transf…
Mapping the Galactic Halo II: Photometric Survey
R. C. Dohm-Palmer, Mario Mateo, E. Olszewski +4
We present imaging results from a high Galactic latitude survey designed to examine the structure of the Galactic halo. The objective of the survey is to identify candidate halo st…
Detection of Lead in the Carbon-Rich, Very Metal-Poor Star LP625-44: A Strong Constraint on s-Process Nucleosynthesis at Low Metallicity
W. Aoki, J. E. Norris, S. G. Ryan +2
We report the detection of the Pb I 4057.8A line in the very metal-poor ([Fe/H]=-2.7), carbon-rich star, LP625-44. We determine the abundance of Pb ([Pb/Fe] = 2.65) and 15 other ne…
Extremely Metal-Poor Stars. VII. The Most Metal-Poor Dwarf, CS 22876-032
John E. Norris, Timothy C. Beers, Sean G. Ryan
We report high-resolution, high-signal-to-noise, observations of the extremely metal-poor double-lined spectroscopic binary CS 22876-032. The system has a long period : P = 424.7 $…