672 citations · 10.2k across the 148 of their papers we have counts for
18 papers · 1 filter
Evidence for multiple nucleosynthetic processes from carbon enhanced metal-poor stars in the Carina dwarf spheroidal galaxy
T. T. Hansen, J. D. Simon, T. S. Li +3
Context: Carbon Enhanced Metal-Poor (CEMP) stars () are known to exist in large numbers at low metallicity in the Milky Way halo and are important tracers of…
Vanadium Abundance Derivations in 255 Metal-poor Stars
Xiaowei Ou, Ian U. Roederer, Christopher Sneden +4
We present vanadium (V) abundances for 255 metal-poor stars, derived from high-resolution optical spectra from the Magellan Inamori Kyocera Echelle spectrograph on the Magellan Tel…
The Axial Rotation and Variable Macroturbulence of RR Lyrae and Red Horizontal Branch Stars
George W. Preston, Christopher Sneden, Merieme Chadid +2
We have derived relations between full-width-half-maxima and equivalent widths of metallic absorption lines in the spectra of RR~Lyrae stars to estimate new upper limits on the axi…
Stellar activity analysis of Barnard's Star: Very slow rotation and evidence for long-term activity cycle
B. Toledo-Padrón, J. I. González Hernández, C. Rodríguez-López +58
The search for Earth-like planets around late-type stars using ultra-stable spectrographs requires a very precise characterization of the stellar activity and the magnetic cycle of…
Metal-Rich RRc stars in the Carnegie RR Lyrae Survey
Christopher Sneden, George W. Preston, Juna A. Kollmeier +6
We describe and employ a stacking procedure to investigate abundances derived from the low S/N spectra obtained in the Carnegie RR Lyrae Survey (CARRS; Kollmeier et al. 2013). We f…
Detailed Chemical Abundances in the r-Process-Rich Ultra-Faint Dwarf Galaxy Reticulum 2
Ian U. Roederer, Mario Mateo, John I. Bailey +10
The ultra-faint dwarf galaxy Reticulum 2 (Ret 2) was recently discovered in images obtained by the Dark Energy Survey. We have observed the four brightest red giants in Ret 2 at hi…