201 citations · 599 across the 13 of their papers we have counts for
13 papers
Silicon and Strontium abundances of very metal-poor stars determined from near-infrared spectra
Wako Aoki, Timothy C. Beers, Satoshi Honda +19
Silicon and Strontium are key elements to explore the nucleosynthesis and chemical evolution of the Galaxy by measurements of very metal-poor stars. There are, however, only a few…
The Photometric Metallicity and Carbon Distributions of the Milky Way's Halo and Solar Neighborhood from S-PLUS Observations of SDSS Stripe 82
Devin D. Whitten, Vinicius M. Placco, Timothy C. Beers +14
We report photometric estimates of effective temperature, , metallicity, [Fe/H], carbonicity, [C/Fe], and absolute carbon abundances, , for over 700,000 st…
The role of faint population III supernovae in forming CEMP stars in ultra-faint dwarf galaxies
Myoungwon Jeon, Volker Bromm, Gurtina Besla +2
CEMP-no stars, a subset of carbon enhanced metal poor (CEMP) stars ( and ) have been discovered in ultra-faint dwarf (UFD) galaxies, with $…
Two Populations of Carbon-Enhanced Metal-Poor Stars in the Disk System of the Milky Way
Sarah E. Dietz, Jinmi Yoon, Timothy C. Beers +2
We present a chemo-dynamical analysis of low-resolution () spectroscopy of stars from the AAOmega Evolution of Galactic Structure (AEGIS) survey, focusing on two key p…
The Metallicity Gradient and Complex Formation History of the Outermost Halo of the Milky Way
Sarah E. Dietz, Jinmi Yoon, Timothy C. Beers +1
We present an examination of the metallicity distribution function of the outermost stellar halo of the Galaxy based on an analysis of both local (within 4 kpc of the Sun, ~16,500…
Identification of a Group III CEMP-no Star in the Dwarf Spheroidal Galaxy Canes Venatici I
Jinmi Yoon, Devin D. Whitten, Timothy C. Beers +3
CEMP-no stars, a subclass of carbon-enhanced metal-poor (CEMP) stars, are one of the most significant stellar populations in Galactic Archaeology, because they dominate the low end…
Origin of the CEMP-no Group Morphology in the Milky Way
Jinmi Yoon, Timothy C. Beers, Di Tian +1
The elemental-abundance signatures of the very first stars are imprinted on the atmospheres of CEMP-no stars, as various evidence suggests they are bona-fide second-generation star…
FRIB and the GW170817 Kilonova
A. Aprahamian, R. Surman, A. Frebel +45
In July 2018 an FRIB Theory Alliance program was held on the implications of GW170817 and its associated kilonova for r-process nucleosynthesis. Topics of discussion included the a…
Galactic Archeology with the AEGIS Survey: The Evolution of Carbon and Iron in the Galactic Halo
Jinmi Yoon, Timothy C. Beers, Sarah Dietz +6
Understanding the evolution of carbon and iron in the Milky Way's halo is of importance because these two elements play crucial roles constraining star formation, Galactic assembly…
Chemical Cartography. I. A Carbonicity Map of the Galactic Halo
Young Sun Lee, Timothy C. Beers, Young Kwang Kim +5
We present the first map of carbonicity, [C/Fe], for the halo system of the Milky Way, based on a sample of over 100,000 main-sequence turnoff stars with available spectroscopy fro…
Observational Constraints on First-Star Nucleosynthesis. II. Spectroscopy of an Ultra Metal-Poor CEMP-no Star
Vinicius M. Placco, Anna Frebel, Timothy C. Beers +6
We report on the first high-resolution spectroscopic analysis of HE0020-1741, a bright (V=12.9), ultra metal-poor ([Fe/H] = -4.1), carbon-enhanced ([C/Fe] = +1.7) star selected fro…
Observational Constraints on First-Star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-no Stars
Jinmi Yoon, Timothy C. Beers, Vinicius M. Placco +6
We investigate anew the distribution of absolute carbon abundance, (C) (C), for carbon-enhanced metal-poor (CEMP) stars in the halo of the Milky Way, based on high-re…
The effect of rotation on the spectrum of Vega
Jinmi Yoon, Deane M. Peterson, Robert J. Zagarello +2
The discovery that Vega is a rapidly rotating pole-on star has raised a number of questions about this fundamental standard, including such issues as its composition, and in turn i…