The nitrogen abundance of the very metal-poor star HD 122563.
- C. Sneden
- Physics
- 1 September 1973
THE HIGH-RESOLUTION CROSS-DISPERSED ECHELLE WHITE PUPIL SPECTROMETER OF THE MCDONALD OBSERVATORY 2.7-M TELESCOPE
- R. Tull, P. MacQueen, C. Sneden, D. Lambert
- Physics
- 1 March 1995
A new high-resolution cross-dispersed echelle spectrometer has been installed at the coude focus of the McDonald Observatory 2.7-m telescope. Its primary goal was to simultaneously gather spectra…
Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-poor Giants
- D. Burris, C. Pilachowski, T. Armandroff, C. Sneden, J. Cowan, H. Roe
- Physics
- 8 May 2000
New abundances for neutron-capture (n-capture) elements in a large sample of metal-poor giants from the Bond survey are presented. The spectra were acquired with the KPNO 4 m echelle and coudé feed…
Neutron-Capture Elements in the Early Galaxy
- C. Sneden, J. Cowan, R. Gallino
- Physics
- 15 August 2008
The content of neutron-capture (trans-iron-peak) elements in the lowmetallicity Galactic halo varies widely from star to star. The differences are both in bulk amount of the neutron-capture elements…
Abundance Variations within Globular Clusters
- R. Gratton, C. Sneden, E. Carretta
- Physics
- 17 August 2004
▪ Abstract Abundance variations within globular clusters (GCs), and of GC stars with respect to field stars, are important diagnostics of a variety of physical phenomena, related to the evolution of…
The Rise of the s-Process in the Galaxy
- J. Simmerer, C. Sneden, J. Cowan, J. Collier, V. Woolf, J. Lawler
- Physics
- 15 October 2004
From newly obtained high-resolution, high signal-to-noise ratio spectra the abundances of the elements La and Eu have been determined over the stellar metallicity range -3 < [Fe/H] < +0.3 in 159…
The Extremely Metal-poor, Neutron Capture-rich Star CS 22892-052: A Comprehensive Abundance Analysis
High-resolution spectra obtained with three ground-based facilities and the Hubble Space Telescope (HST) have been combined to produce a new abundance analysis of CS 22892-052, an extremely…
The Ultra--Metal-poor, Neutron-Capture--rich Giant Star CS 22892-052
- C. Sneden, A. McWilliam, G. Preston, J. Cowan, D. Burris, B. J. Armosky
- Physics
- 1 August 1996
Improved Laboratory Transition Parameters forEu II and Application to the Solar Europium Elemental and Isotopic Composition
- J. Lawler, M. Wickliffe, E. A. Hartog, C. Sneden
- Physics
- 20 December 2001
New radiative lifetime measurements using time-resolved laser-induced fluorescence are reported for the lowest six even-parity levels of Eu II. Branching fractions, measured from Fourier transform…
The Chemical Composition Contrast between M3 and M13 Revisited: New Abundances for 28 Giant Stars in M3
- C. Sneden, R. P. Kraft, P. Guhathakurta, R. Peterson, J. Fulbright
- Physics
- 21 November 2003
We report new chemical abundances of 23 bright red giant members of the globular cluster M3, based on high-resolution (R ∼ 45,000) spectra obtained with the Keck I telescope. The observations, which…
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