S. Ryan

Publications198
h-index46
Citations7,105
Highly Influential Citations791
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Carbon-enhanced Metal-poor Stars. I. Chemical Compositions of 26 Stars*
The chemical compositions of 26 metal-poor stars that exhibit strong CH and/or C2 molecular bands are determined. Twenty-two stars in our sample satisfy our definition for carbon-enhanced metal-poor…
Nucleosynthetic signatures of the first stars
TLDR
The discovery of HE1327–2326 is reported, a subgiant or main-sequence star with an iron abundance about a factor of two lower than that of HE0107–5240, suggesting a similar origin of the abundance patterns.
Subdwarf studies. III, The halo metallicity distribution
We have constructed the metallicity distribution of a sample of 372 kinematically selected halo stars, most having spectroscopically determined abundances, drawn from our southern subdwarf study and…
Extremely Metal-Poor Stars. II. Elemental Abundances and the Early Chemical Enrichment of The Galaxy*
We have obtained high-resolution spectra of 23 very metal-poor stars and present an abundance analysis for 19 of these for elements between Mg and Eu. The sample comprises roughly equal numbers of…
THE MOST METAL-POOR STARS. II. CHEMICAL ABUNDANCES OF 190 METAL-POOR STARS INCLUDING 10 NEW STARS WITH [Fe/H] ⩽ –3.5*, **, ** *
We present a homogeneous chemical abundance analysis of 16 elements in 190 metal-poor Galactic halo stars (38 program and 152 literature objects). The sample includes 171 stars with [Fe/H] {<=} -2.5,…
The Spite Lithium Plateau: Ultrathin but Postprimordial
Original article can be found at: http://www.journals.uchicago.edu/loi/apj--Copyright University of Chicago Press / American Astronomical Society
A Subaru/High Dispersion Spectrograph Study of Lead (Pb) Abundances in Eight s-Process Element-rich, Metal-poor Stars
We report the abundances of neutron-capture elements in eight carbon-rich, metal-poor (� 2:7 �½ Fe=H ��� 1:9) stars observed with the Subaru Telescope High Dispersion Spectrograph. The derived…
The Most Metal-poor Stars. IV. The Two Populations with [Fe/H] ?3.0
We discuss the carbon-normal and carbon-rich populations of Galactic halo stars having [Fe/H] {approx} +1.5); the light elements Na, Mg, and Al are enhanced relative to Fe in half the sample; and for…
Neutron-Capture Elements in the Very Metal Poor Star HD 122563*
We obtained high-resolution, high signal-to-noise ratio (S/N) spectroscopy for the very metal poor star HD 122563 with the Subaru Telescope High Dispersion Spectrograph. Previous studies have shown…
High-resolution spectroscopy of Vega-like stars — I. Effective temperatures, gravities and photospheric abundances
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