Publications (106)
Hunting the Parent of the Orphan Stream II: The First High-Resolution Spectroscopic Study
Andrew Casey, Stefan Keller, Gary Da Costa +2
The R-Process Alliance: Discovery of a low-alpha, r-Process-Enhanced Metal-Poor Star in the Galactic Halo
Charli M. Sakari, Ian U. Roederer, Vinicius M. Placco +24
Metal-Poor Stars
Anna Frebel
An Extremely Carbon-rich, Extremely Metal-poor Star in the Segue 1 System
John E. Norris, Gerard Gilmore, Rosemary F. G. Wyse +2
From Nuclei to the Cosmos: Tracing Heavy-Element Production with the Oldest Stars
Anna Frebel
The Caterpillar Project: A Large Suite of Milky Way Sized Halos
Brendan F. Griffen, Alexander P. Ji, Gregory A. Dooley +4
Chemical Abundances in the Ultra-Faint Dwarf Galaxies Grus I and Triangulum II: Neutron-Capture Elements as a Defining Feature of the Faintest Dwarfs
Alexander P. Ji, Joshua D. Simon, Anna Frebel +2
Preserving chemical signatures of primordial star formation in the first low-mass stars
Alexander P. Ji, Anna Frebel, Volker Bromm
Detection of a population of carbon-enhanced metal-poor stars in the Sculptor dwarf spheroidal galaxy
Anirudh Chiti, Joshua D. Simon, Anna Frebel +6
Neutron Star Mergers Might not be the Only Source of r-Process Elements in the Milky Way
Benoit Côté, Marius Eichler, Almudena Arcones +8
R-process enrichment from a single event in an ancient dwarf galaxy
Alexander P. Ji, Anna Frebel, Anirudh Chiti +1
The Chemical Compositions of Very Metal-Poor Stars HD 122563 and HD 140283; A View From the Infrared
Melike AfÅar, Christopher Sneden, Anna Frebel +11
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
The R-Process Alliance: Spectroscopic Follow-up of Low-Metallicity Star Candidates from the Best & Brightest Survey
Vinicius M. Placco, Rafael M. Santucci, Timothy C. Beers +17
The Most Metal-Poor Stars. I. Discovery, Data, and Atmospheric Parameters
John E. Norris, M. S. Bessell, David Yong +7
The Hobby-Eberly Telescope "Chemical Abundances of Stars in the Halo" (CASH) Project. I. The Lithium-, s-, and r-Enhanced Metal-Poor Giant HKII 17435-00532
Ian U. Roederer, Anna Frebel, Matthew D. Shetrone +7
Evidence for an aspherical Population III supernova explosion inferred from the hyper metal-poor star HE1327-2326
Rana Ezzeddine, Anna Frebel, Ian U. Roederer +6
Predicting the locations of possible long-lived low-mass first stars: Importance of satellite dwarf galaxies
Mattis Magg, Tilman Hartwig, Bhaskar Agarwal +4
The Most Metal-Poor Stars. II. Chemical Abundances of 190 Metal-Poor Stars Including 10 New Stars With [Fe/H] < -3.5
David Yong, John E. Norris, M. S. Bessell +6
Reconstructing the cosmic evolution of the chemical elements
Anna Frebel
Complete element abundances of nine stars in the r-process galaxy Reticulum II
Alexander P. Ji, Anna Frebel, Joshua D. Simon +1
Carbon-Enhanced Metal-Poor Star Frequencies in the Galaxy: Corrections for the Effect of Evolutionary Status on Carbon Abundances
Vinicius M. Placco, Anna Frebel, Timothy C. Beers +1
The Oxygen Abundance of HE 1327-2326
Anna Frebel, Norbert Christlieb, John E. Norris +2
The minimum stellar metallicity observable in the Galaxy
Anna Frebel, Jarrett L. Johnson, Volker Bromm
Stellar Archaeology: New Science with Old Stars
Anna Frebel
Observing the r-Process Signature in the Oldest Stars
Anna Frebel
Discovery of HE 1523-0901, a Strongly r-Process Enhanced Metal-Poor Star with Detected Uranium
Anna Frebel, Norbert Christlieb, John E. Norris +3
Portrait of a Dark Horse: a Photometric and Spectroscopic Study of the Ultra-faint Milky Way Satellite Pegasus III
Dongwon Kim, Helmut Jerjen, Marla Geha +6
Bright Metal-Poor Stars from the Hamburg/ESO Survey. II. A Chemodynamical Analysis
Timothy C. Beers, Vinicius M. Placco, Daniela Carollo +6
Chemical Diversity in the Ultra-faint Dwarf Galaxy Tucana II
Alexander P. Ji, Anna Frebel, Rana Ezzeddine +1
The 300km/s stellar stream near Segue 1: Insights From high-resolution spectroscopy of its brightest star
Anna Frebel, Ragnhild Lunnan, Andrew R. Casey +3
The $R$-Process Alliance: First Release from the Southern Search for $r$-Process-Enhanced Stars in the Galactic Halo
Terese T. Hansen, Erika M. Holmbeck, Timothy C. Beers +6
Selecting ultra-faint dwarf candidate progenitors in cosmological N-body simulations at high redshifts
Mohammadtaher Safarzadeh, Alexander P. Ji, Gregory A. Dooley +4
JINAbase: A database for chemical abundances of metal-poor stars
Abdu Abohalima, Anna Frebel
Chemical Signatures of the First Galaxies: Criteria for One-Shot Enrichment
Anna Frebel, Volker Bromm
Chemical Abundance Analysis of the Extremely Metal-Poor Star HE 1300+0157
Anna Frebel, John E. Norris, Wako Aoki +5
Hubble Space Telescope Near-Ultraviolet Spectroscopy of Bright CEMP-s Stars
Vinicius M. Placco, Timothy C. Beers, Inese I. Ivans +14
Chemical Abundance Signature of J0023+0307 -- A Second-Generation Main-Sequence Star with [Fe/H]<-6
Anna Frebel, Alexander P. Ji, Rana Ezzeddine +4
High-resolution spectroscopy of extremely metal-poor stars in the least evolved galaxies: Bootes II
Alexander P. Ji, Anna Frebel, Joshua D. Simon +1
Segue 1 - A Compressed Star Formation History Before Reionization
David Webster, Anna Frebel, Joss Bland-Hawthorn
SD 1313-0019 -- Another second-generation star with [Fe/H] = -5.0, observed with the Magellan Telescope
Anna Frebel, Anirudh Chiti, Alexander P. Ji +2
Broadband UBVRI Photometry of Horizontal-Branch and Metal-Poor Candidates from the HK and Hamburg/ESO Surveys. I
Timothy C. Beers, Chris Flynn, Silvia Rossi +17
The Role of Dwarf Galaxies in Building Large Stellar Halos
Evan N. Kirby, Puragra Guhathakurta, James S. Bullock +10
Deriving Stellar Effective Temperatures of Metal-Poor Stars with the Excitation Potential Method
Anna Frebel, Andrew R. Casey, Heather R. Jacobson +1
Four Metal-poor Stars in the Sagittarius Dwarf Spheroidal Galaxy
Anirudh Chiti, Anna Frebel
RAVE J203843.2-002333: The first highly r-process-enhanced star identified in the RAVE survey
Vinicius M. Placco, Erika M. Holmbeck, Anna Frebel +9
The predicted luminous satellite populations around SMC and LMC-mass galaxies - A missing satellite problem around the LMC?
Gregory A. Dooley, Annika H. G. Peter, Jeffrey L. Carlin +3
Detection of the Second r-process Peak Element Tellurium in Metal-Poor Stars
Ian U. Roederer, James E. Lawler, John J. Cowan +6
The Chemical Abundances of Stars in the Halo (CASH) Project. II. A Sample of 16 Extremely Metal-poor Stars
Julie K. Hollek, Anna Frebel, Ian U. Roederer +5
Chemical Signatures of the First Supernovae in the Sculptor Dwarf Spheroidal Galaxy
Joshua D. Simon, Heather R. Jacobson, Anna Frebel +3
The Effects of Varying Cosmological Parameters on Halo Substructure
Gregory A. Dooley, Brendan F. Griffen, Phillip Zukin +4
Spectroscopic Discovery of the Broad-Lined Type Ic Supernova 2010bh Associated with the Low-Redshift GRB 100316D
Ryan Chornock, Edo Berger, Emily M. Levesque +14
Spectroscopic Validation of Low-Metallicity Stars from RAVE
Vinicius M. Placco, Timothy C. Beers, Rafael M. Santucci +16
The chemical evolution of the Bootes I ultra-faint dwarf galaxy
Anna Frebel, John E. Norris, Gerard Gilmore +1
Metal-Poor Stars Observed with the Magellan Telescope I. Constraints on Progenitor Mass and Metallicity of AGB Stars Undergoing s-Process Nucleosynthesis
Vinicius M. Placco, Anna Frebel, Timothy C. Beers +5
The Most Metal-Poor Stars. IV. The Two Populations With [Fe/H] < -3.0
John E. Norris, David Yong, M. S. Bessell +8
Near-Field Cosmology with Metal-Poor Stars
Anna Frebel, John E. Norris
Chemical Enrichment in the Faintest Galaxies: the Carbon and Iron Abundance Spreads in the Boötes I Dwarf Spheroidal Galaxy and the Segue 1 System
John E. Norris, Rosemary F. G. Wyse, Gerard Gilmore +5
Exploring the Universe with Metal-Poor Stars
Anna Frebel
High-Resolution Spectroscopy of Extremely Metal-Poor Stars in the Least Evolved Galaxies: Ursa Major II and Coma Berenices
Anna Frebel, Joshua D. Simon, Marla Geha +1
Nucleosynthesis in a Primordial Supernova: Carbon and Oxygen Abundances in SMSS J031300.36-670839.31
Michael Bessell, Remo Collett, Stefan Keller +15
New Hubble Space Telescope Observations of Heavy Elements in Four Metal-Poor Stars
Ian U. Roederer, James E. Lawler, Jennifer S. Sobeck +7
From actinides to zinc: Using the full abundance pattern of the brightest star in Reticulum II to distinguish between different r-process sites
Alexander P. Ji, Anna Frebel
The Chemical Imprint of Silicate Dust on the Most Metal-Poor Stars
Alexander P. Ji, Anna Frebel, Volker Bromm
Linking dwarf galaxies to halo building blocks with the most metal-poor star in Sculptor
Anna Frebel, Evan Kirby, Joshua D. Simon
The Origin of r-process Enhanced Metal-Poor Halo Stars In Now-Destroyed Ultra-Faint Dwarf Galaxies
Kaley Brauer, Alexander P. Ji, Anna Frebel +3
Uncovering Extremely Metal-Poor Stars in the Milky Way's Ultra-Faint Dwarf Spheroidal Satellite Galaxies
Evan N. Kirby, Joshua D. Simon, Marla Geha +2
The R-Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-Poor Star with an Extreme R-Process Enhancement of [Eu/H] = -0.14
Ian U. Roederer, Charli M. Sakari, Vinicius M. Placco +4
Ultra metal-poor stars: Spectroscopic determination of stellar atmospheric parameters using iron Non-LTE line abundances
Rana Ezzeddine, Anna Frebel, Bertrand Plez
The Chemical Evolution of Phosphorus
Heather R. Jacobson, Thanawuth Thanathibodee, Anna Frebel +3
The EMBLA Survey -- Metal-poor stars in the Galactic bulge
Louise M. Howes, Martin Asplund, Stefan C. Keller +14
Stellar Archaeology -- Exploring the Universe with Metal-Poor Stars
Anna Frebel
Astro2020 Science White Paper: Local Dwarf Galaxy Archaeology
Alexander P. Ji, Rachel Beaton, Sukanya Chakrabarti +8
High-Resolution Spectroscopy of Extremely Metal-Poor Stars from SDSS/SEGUE: I. Atmospheric Parameters and Chemical Compositions
Wako Aoki, Timothy C. Beers, Young Sun Lee +8
The Effects of Patchy Reionization on Satellite Galaxies of the Milky Way
Ragnhild Lunnan, Mark Vogelsberger, Anna Frebel +3
Metal-Poor Stars Observed with the Magellan Telescope. III. New Extremely and Ultra Metal-Poor Stars from SDSS/SEGUE and Insights on the Formation of Ultra Metal-Poor Stars
Vinicius M. Placco, Anna Frebel, Young Sun Lee +5
High-Resolution Spectroscopic Study of Extremely Metal-Poor Star Candidates from the SkyMapper Survey
Heather. R. Jacobson, Stefan Keller, Anna Frebel +13
Tracing the first stars and galaxies of the Milky Way
Brendan F. Griffen, Gregory A. Dooley, Alexander P. Ji +3
Non-LTE effects on the lead and thorium abundance determinations for cool stars
Lyudmila Mashonkina, Alexander Ryabtsev, Anna Frebel
The R-Process Alliance: First Release from the Northern Search for r-Process Enhanced Metal-Poor Stars in the Galactic Halo
Charli M. Sakari, Vinicius M. Placco, Elizabeth M. Farrell +26
Enhanced tidal stripping of satellites in the galactic halo from dark matter self-interactions
Gregory A. Dooley, Annika H. G. Peter, Mark Vogelsberger +2
HE 1327-2326, an unevolved star with [Fe/H]<-5.0. II. New 3D-1D corrected abundances from a VLT/UVES spectrum
Anna Frebel, Kjell Eriksson, Remo Collet +2
Nucleosynthetic signatures of the first stars
Anna Frebel, Wako Aoki, Norbert Christlieb +16
The Metallicity of the Monoceros Stream
Aaron M. Meisner, Anna Frebel, Mario Juric +1
CD -24_17504 revisited: a new comprehensive element abundance analysis
Heather R. Jacobson, Anna Frebel
Revisiting the iron abundance in the hyper iron-poor star HE$~$1327-2326 with UV COS/$HST$ data
Rana Ezzeddine, Anna Frebel
The R-Process Alliance: 2MASS J09544277+5246414, the Most Actinide-Enhanced R-II Star Known
Erika M. Holmbeck, Timothy C. Beers, Ian U. Roederer +8
Probing the Formation of the First Low-Mass Stars with Stellar Archaeology
Anna Frebel, Jarrett L. Johnson, Volker Bromm
The R-Process Alliance: Chemical Abundances for a Trio of R-Process-Enhanced Stars -- One Strong, One Moderate, One Mild
Madelyn Cain, Anna Frebel, Maude Gull +9
Chemical Abundances of new member stars in the Tucana II dwarf galaxy
Anirudh Chiti, Anna Frebel, Alexander P. Ji +3
The Chemical Abundances of Stars in the Halo (CASH) Project. III. A New Classification Scheme for Carbon-Enhanced Metal-poor Stars with S-process Element Enhancement
Julie K. Hollek, Anna Frebel, Vinicius M. Placco +4
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
Segue 1: An Unevolved Fossil Galaxy from the Early Universe
Anna Frebel, Joshua D. Simon, Evan N. Kirby
Observational nuclear astrophysics: neutron-capture element abundances in old, metal-poor stars
Heather R. Jacobson, Anna Frebel
The Most Metal-Poor Stars. III. The Metallicity Distribution Function and CEMP Fraction
David Yong, John E. Norris, M. S. Bessell +6
New Detections of Arsenic, Selenium, and Other Heavy Elements in Two Metal-Poor Stars
Ian U. Roederer, Hendrik Schatz, James E. Lawler +6
Metal-Poor Stars and the Chemical Enrichment of the Universe
Anna Frebel, John E. Norris
The Aquarius Co-Moving Group is Not a Disrupted Classical Globular Cluster
Andrew R. Casey, Stefan Keller, Alan Alves-Brito +8
Descendants of the first stars: the distinct chemical signature of second generation stars
Tilman Hartwig, Naoki Yoshida, Mattis Magg +9
High-Resolution Spectroscopy of Extremely Metal-Poor Stars in the Least Evolved Galaxies: Leo IV
Joshua D. Simon, Anna Frebel, Andrew McWilliam +2