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The Chemical Composition of Carbon-Rich, Very Metal-Poor Stars: A New Class of Mildly Carbon-Rich Objects Without Excess of Neutron-Capture Elements
Wako Aoki, John E. Norris, Sean G. Ryan +2
We report on an analysis of the chemical composition of five carbon-rich, very metal-poor stars based on high-resolution spectra. One star, CS22948-027, exhibits very large overabu…
Extremely Metal-Poor Stars. VIII. High-Resolution, High-Signal-To-Noise Analysis of Five Stars with [Fe/H] < -3.5
John E. Norris, Sean G. Ryan, Timothy C. Beers
High-resolution, high-signal-to-noise (<S/N> = 85) spectra have been obtained for five stars -- CD-24:17504, CD-38:245, CS 22172-002, CS 22885-096, and CS 22949-037 -- having [Fe/H…
Neutron Capture Elements in s-Process-Rich, Very Metal-Poor Stars
Wako Aoki, Sean G. Ryan, John E. Norris +6
We report abundance estimates for neutron-capture elements, including lead (Pb), and nucleosynthesis models for their origin, in two carbon-rich, very metal-poor stars, LP625-44 an…
Tuning the Clock: Uranium and Thorium Chronometers Applied to CS 31082-001
R. Toenjes, H. Schatz, K. -L. Kratz +4
We obtain age estimates for the progenitor(s) of the extremely metal-poor ([Fe/H = -2.9) halo star CS 31082-001, based on the recently reported first observation of a Uranium abund…
Galaxy Formation: One Star at a Time. New Information from the Kinematics of Field Stars in the Galaxy
Timothy C. Beers, Masashi Chiba
We present a review of recent studies of the formation and evolution of the Milky Way galaxy, in particular based on large samples of non-kinematically selected stars with availabl…
R-process pattern in the Very-Metal-Poor Halo Star CS31082-001
V. Hill, B. Plez, R. Cayrel +1
The very-metal-poor halo star CS31082-001 was discovered to be very strongly r-process-enhanced during the course of a VLT+UVES high-resolution follow-up of metal-poor stars identi…