141 citations · 483 across the 10 of their papers we have counts for
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Abundances of carbon-enhanced metal-poor stars as constraints on their formation
C. J. Hansen, B. Nordstroem, T. T. Hansen +6
An increasing fraction of carbon-enhanced metal-poor (CEMP) stars is found as their iron abundance, [Fe/H], decreases below [Fe/H] = -2.0. The CEMP-s stars have the highest absolut…
Seven New Carbon-Enhanced Metal-Poor RR Lyrae Stars
Catherine R. Kennedy, Richard J. Stancliffe, Charles Kuehn +6
We report estimated carbon-abundance ratios, [C/Fe], for seven newly-discovered carbon-enhanced metal-poor (CEMP) RR Lyrae stars. These are well-studied RRab stars that had previou…
Metal-Poor Stars Observed with the Magellan Telescope II. Discovery of Four Stars with [Fe/H] < -3.5
Vinicius M. Placco, Anna Frebel, Timothy C. Beers +5
We report on the discovery of seven low-metallicity stars selected from the Hamburg/ESO Survey, six of which are extremely metal-poor ([Fe/H]<-3.0), with four having [Fe/H]<-3.5. C…
Modelling the nucleosynthetic properties of carbon-enhanced metal-poor RR Lyrae stars
Richard J. Stancliffe, Catherine R. Kennedy, Herbert H. B. Lau +1
Certain carbon-enhanced metal-poor stars likely obtained their composition via pollution from some of the earliest generations of asymptotic giant branch stars and as such provide…
Searches for Metal-Poor Stars from the Hamburg/ESO Survey using the CH G-band
Vinicius M. Placco, Catherine R. Kennedy, Timothy C. Beers +6
We describe a new method to search for metal-poor candidates from the Hamburg/ESO objective-prism survey (HES) based on identifying stars with apparently strong CH G-band strengths…
[O/Fe] Estimates for Carbon-Enhanced Metal-Poor Stars from Near-IR Spectroscopy
Catherine R. Kennedy, Thirupathi Sivarani, Timothy C. Beers +6
We report on oxygen abundances determined from medium-resolution near-IR spectroscopy for a sample of 57 carbon-enhanced metal-poor (CEMP) stars selected from the Hamburg/ESO surve…
A Search for Unrecognized Carbon-Enhanced Metal-Poor Stars in the Galaxy
Vinicius M. Placco, Catherine R. Kennedy, Silvia Rossi +6
We have developed a new procedure to search for carbon-enhanced metal-poor (CEMP) stars from the Hamburg/ESO (HES) prism-survey plates. This method employs an extended line index f…