Ian Ulysses Roederer

Abundances of Neutron-capture Elements in 62 Stars in the Globular Cluster Messier 15

ASTROPHYSICAL JOURNAL, 967(2).

Atomic Transition Probabilities for Ultraviolet and Optical Lines of Tm ii

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 274(1).

Discovery of a Metal-poor Red Giant Star with the Highest Ultralithium Enhancement

ASTROPHYSICAL JOURNAL, 973(2).

Measurement of the 140Ceðn;γþ Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe

PHYSICAL REVIEW LETTERS, 132(12).

The <i>R</i>-Process Alliance: 2MASS J22132050-5137385, the Star with the Highest-known <i>r</i>-process Enhancement at [Eu/Fe] =+2.45

ASTROPHYSICAL JOURNAL, 971(2).

The <i>R</i>-Process Alliance: Analysis of limited-<i>r</i> stars

ASTRONOMY & ASTROPHYSICS, 688.

The <i>R</i>-process Alliance: Fifth Data Release from the Search for <i>R</i>-process-enhanced Metal-poor Stars in the Galactic Halo with the GTC

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 274(2).

The R-Process Alliance: detailed chemical composition of an r-process enhanced star with UV and optical spectroscopy

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 529(3), 1917–1940.

The discovery space of ELT-ANDES. Stars and stellar populations

EXPERIMENTAL ASTRONOMY, 57(2).

Abundance Analysis of Stars at Large Radius in the Sextans Dwarf Spheroidal Galaxy*

The Astrophysical Journal, 954(1), 55.

Atomic Transition Probabilities for Transitions of Si i and Si ii and the Silicon Abundances of Several Very Metal-poor Stars <sup>∗  

The Astrophysical Journal Supplement Series, 265(2), 42.

Element abundance patterns in stars indicate fission of nuclei heavier than uranium

Evidence for transuranic fission fragments in stars

Bulletin of the American Astronomical Society, 55(2).

Finding r-II Sibling Stars in the Milky Way with the Greedy Optimistic Clustering Algorithm

The Astrophysical Journal, 946(1), 48.

HD 222925: A New Opportunity to Explore the Astrophysical and Nuclear Conditions of r-process Sites

The Astrophysical Journal, 951(1), 30.

Iron-peak Element Abundances in Warm Very Metal-poor Stars

The Astrophysical Journal, 953(1), 31.

Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo*

The Astrophysical Journal Supplement Series, 268(1), 19.

Metal Mixing in the r-process Enhanced Ultrafaint Dwarf Galaxy Reticulum II*

The Astronomical Journal, 165(3), 100.

SPLUS J142445.34-254247.1: An <i>r</i>-process-enhanced, Actinide-boost, Extremely Metal-poor Star Observed with GHOST

ASTROPHYSICAL JOURNAL, 959(1).

The R-Process Alliance: Chemodynamically Tagged Groups. II. An Extended Sample of Halo r-process-enhanced Stars

The Astrophysical Journal, 943(1), 23.

The kinematics, metallicities, and orbits of six recently discovered Galactic star clusters with Magellan/M2FS spectroscopy

Monthly Notices of the Royal Astronomical Society, 526(1), 1075–1094.

Uranium Abundances and Ages of r-process Enhanced Stars with Novel U ii Lines*

The Astrophysical Journal, 948(2), 122.

ANDES, the high resolution spectrograph for the ELT: science case, baseline design and path to construction

(C. J. Evans, J. J. Bryant, & K. Motohara, Eds.).

Discovery of an Ultra Lithium-rich Metal-Poor Red Giant star

(ArXiv Preprint No. 2209.02184).

Horizons: nuclear astrophysics in the 2020s and Beyond

Journal of Physics G: Nuclear and Particle Physics, 49(11), 110502.

The R-Process Alliance: Abundance Universality among Some Elements at and between the First and Second R-Process Peaks*

The Astrophysical Journal, 936(1), 84.

The R-process Alliance: A Nearly Complete R-process Abundance Template Derived from Ultraviolet Spectroscopy of the R-process-enhanced Metal-poor Star HD 222925*

The Astrophysical Journal Supplement Series, 260(2), 27.

The chemical abundance pattern of the extremely metal-poor thin disc star 2MASS J1808−5104 and its origins

Monthly Notices of the Royal Astronomical Society, 517(3), 3993–4004.

The complex stellar system M 22: confirming abundance variations with high precision differential measurements

Monthly Notices of the Royal Astronomical Society, 516(3), 3515–3531.

Atomic Transition Probabilities of Neutral Calcium*

The Astrophysical Journal Supplement Series, 255(2), 27.

Detection of Al ii in the Ultraviolet Spectra of Metal-poor Stars: An Empirical LTE Test of NLTE Aluminum Abundance Calculations*

The Astrophysical Journal, 912(2), 119.

Dynamical masses and mass-to-light ratios of resolved massive star clusters – II. Results for 26 star clusters in the Magellanic Clouds

Monthly Notices of the Royal Astronomical Society, 504(3), 4160–4191.

Improved Atomic Transition Probabilities for UV and Optical Lines of Hf II and Determination of the Hf Abundance in Two Metal-poor Stars*

The Astrophysical Journal Supplement Series, 254(1), 5.

Linemake: An Atomic and Molecular Line List Generator

Research Notes of the AAS, 5(4), 92.

Orbital Parameters and Binary Properties of 37 FGK Stars in the Cores of Open Clusters NGC 2516 and NGC 2422

The Astronomical Journal, 162(6), 285.

Probing the He <scp>ii</scp> re-Ionization ERa via Absorbing C <scp>iv</scp> Historical Yield (HIERACHY) I: A strong outflow from a <i>z</i> ∼ 4.7 quasar

Monthly Notices of the Royal Astronomical Society, 505(3), 4444–4455.

R-process-rich Stellar Streams in the Milky Way*

The Astrophysical Journal, 912(1), 52.

SPLUS J210428.01−004934.2: An Ultra Metal-poor Star Identified from Narrowband Photometry*

The Astrophysical Journal Letters, 912(2), L32.

The R-Process Alliance: Chemodynamically Tagged Groups of Halo r-process-enhanced Stars Reveal a Shared Chemical-evolution History

The Astrophysical Journal, 908(1), 79.

Detailed Iron-peak Element Abundances in Three Very Metal-poor Stars

The Astrophysical Journal, 890(2), 119.

Detection of Pb II in the Ultraviolet Spectra of Three Metal-poor Stars

The Astrophysical Journal, 902(1), L24.

Hyperfine Structure Constants for Levels of <sup>175

The Astrophysical Journal Supplement Series, 248(1), 10.

The <i>R</i>-Process Alliance: A Very Metal-poor, Extremely <i>r</i>-process-enhanced Star with [Eu/Fe] = + 2.2, and the Class of <i>r-</i>III Stars

The Astrophysical Journal, 898(1), 40.

The <i>R</i>-Process Alliance: First Magellan/MIKE Release from the Southern Search for <i>R</i>-process-enhanced Stars

The Astrophysical Journal, 898(2), 150.

The Environment of the <i>r</i>-process: New Advances Enabled by the Study of the Orbits of <i>r</i>-process-enhanced Stars

Proceedings of the 15th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG15). Presented at the Proceedings of the 15th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG15).

The Habitable Exoplanet Observatory (HabEx) Mission Concept Study Final Report

(ArXiv Preprint No. 2001.06683).

The R-Process Alliance: Fourth Data Release from the Search for R-process-enhanced Stars in the Galactic Halo*

The Astrophysical Journal Supplement Series.

The R-Process Alliance: a new stellar template for the r-process abundance pattern

Bulletin of the American Astronomical Society, 52(3), 207.03.

The R-process Alliance: The Peculiar Chemical Abundance Pattern of RAVE J183013.5−455510*

The Astrophysical Journal.

Vanadium Abundance Derivations in 255 Metal-poor Stars

The Astrophysical Journal, 900(2), 106.

Dynamical masses and mass-to-light ratios of resolved massive star clusters – I. NGC 419 and NGC 1846

Monthly Notices of the Royal Astronomical Society, 490(1), 385–407.

Evidence for an Aspherical Population III Supernova Explosion Inferred from the Hyper-metal-poor Star HE 1327–2326∗

The Astrophysical Journal.

Fundamental Stellar Physics throughout the Galaxy

[Astro2020: Decadal Survey on Astronomy and Astrophysics, science white papers]. Bulletin of the American Astronomical Society, 51(3), 197.

High-resolution Optical Spectroscopy of Stars in the Sylgr Stellar Stream

The Astrophysical Journal, 883(1), 84.

Local Dwarf Galaxy Archaeology

[Astro2020: Decadal Survey on Astronomy and Astrophysics, science white papers]. Bulletin of the American Astronomical Society, 51(3), 166.

Origin of a Massive Hyper-runaway Subgiant Star LAMOST-HVS1: Implication from <i>Gaia</i> and Follow-up Spectroscopy

The Astrophysical Journal, 873(2), 116.

RELICS: Strong Lensing Analysis of MACS J0417.5–1154 and Predictions for Observing the Magnified High-redshift Universe with <i>JWST

The Astrophysical Journal, 873(1), 96.

The <i>R</i>-Process Alliance: Discovery of a Low-<i>α</i>, <i>r</i>-process-enhanced Metal-poor Star in the Galactic Halo

The Astrophysical Journal, 874(2), 148.

The First Stars and the Origin of the Elements

[Astro2020: Decadal Survey on Astronomy and Astrophysics, science white papers]. Bulletin of the American Astronomical Society, 51(3), 163.

The Potential of Ultraviolet Spectroscopy To Open New Frontiers To Study the First Stars

Bulletin of the American Astronomical Society, 51(3), 49.

The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey

The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey. The Astrophysical Journal, 870(2), 122.

The astrophysical r-process and the origin of the heaviest elements

[Astro2020: Decadal Survey on Astronomy and Astrophysics, science white papers]. Bulletin of the American Astronomical Society, 51(3), 136.

Using Gaia DR2 to study the kinematics of highly r-process-enhanced stars

Bulletin of the American Astronomical Society, 51, 23104.

r</i>-process nucleosynthesis: connecting rare-isotope beam facilities with the cosmos

Journal of Physics G: Nuclear and Particle Physics, 46(8), 083001.

A New Test of Copper and Zinc Abundances in Late-type Stars Using Ultraviolet Cu ii and Zn ii Lines

The Astrophysical Journal, 857(1), 2.

Consistent Iron Abundances Derived from Neutral and Singly Ionized Iron Lines in Ultraviolet and Optical Spectra of Six Warm Metal-poor Stars

The Astrophysical Journal, 860(2), 125.

FRIB and the GW170817 Kilonova

[ArXiv preprint]. Proceedings for the FRIB Theory Alliance workshop, (1809.00703).

Heavy elements in ultra-faint dwarf galaxies

Bulletin of the American Astronomical Society, 50, 232.

Kinematics of Highly <i>r</i>-process-enhanced Field Stars: Evidence for an Accretion Origin and Detection of Several Groups from Disrupted Satellites

The Astronomical Journal, 156(4), 179.

Old, Metal-poor Extreme Velocity Stars in the Solar Neighborhood

The Astrophysical Journal, 866(2), 121.

Spectroscopic Validation of Low-metallicity Stars from RAVE

The Astronomical Journal, 155(6), 256.

The <i>R</i>-Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-poor Star with an Extreme <i>R</i> -process Enhancement of [Eu/H] = −0.14

The Astrophysical Journal, 865(2), 129.

The <i>R</i>-Process Alliance: Chemical Abundances for a Trio of <i>r</i>-process-enhanced Stars—One Strong, One Moderate, and One Mild

The Astrophysical Journal, 864(1), 43.

The <i>R</i>-Process Alliance: First Release from the Northern Search for <i>r</i>-process-enhanced Metal-poor Stars in the Galactic Halo

The Astrophysical Journal, 868(2), 110.

The <i>R</i>-process Alliance: First Release from the Southern Search for <i>R</i>-process-enhanced Stars in the Galactic Halo

The Astrophysical Journal, 858(2), 92.

The R-Process Alliance: 2MASS J09544277+5246414, the Most Actinide-enhanced R-II Star Known

The Astrophysical Journal Letters.

The r-process Pattern of a Bright, Highly r-process-enhanced Metal-poor Halo Star at [Fe/H] ∼ −2

The Astrophysical Journal Letters.

Using CETUS to study the first stars and first metals

Bulletin of the American Astronomical Society, 50, 140.14.

Using r-process enhanced galaxies to estimate the neutron star merger rate at high redshift

Bulletin of the American Astronomical Society, 50, 231.

An Expanded Chemo-dynamical Sample of Red Giants in the Bar of the Large Magellanic Cloud

The Astronomical Journal, 153(6), 261.

An update on the r-process one year after the discovery of the Reticulum II dwarf galaxy

2017 JINA-CEE Frontiers in Nuclear Astrophysics. Presented at the 2017 JINA-CEE Frontiers in Nuclear Astrophysics, Lansing, MI.

Finding the UV–Visible Path Forward: Proceedings of the Community Workshop to Plan the Future of UV/Visible Space Astrophysics

Publications of the Astronomical Society of the Pacific, 129(977), 076001.

Hubble Space Telescope</i>Ultraviolet Spectroscopy of the Most Iron-poor Star Known

Research Notes of the AAS, 1(1), 56.

Identification of Near-infrared [Se iii] and [Kr vi] Emission Lines in Planetary Nebulae

The Astrophysical Journal, 840(2), 80.

Neutron-capture element abundances in the planetary nebula NGC 5315 from deep optical and near-infrared spectrophotometry★†

Monthly Notices of the Royal Astronomical Society, 471(2), 1341–1369.

Observations of CEMP-i Stars

A Celebration of CEMP and a Gala of GALAH. Presented at the A Celebration of CEMP and a Gala of GALAH, Melbourne, Australia.

THE ORIGIN OF THE HEAVIEST METALS IN MOST ULTRA-FAINT DWARF GALAXIES

The Astrophysical Journal, 835(1), 23.

The environment of the r-process

Forging Connections: from Nuclei to the Cosmic Web. Presented at the Forging Connections: from Nuclei to the Cosmic Web, East Lansing, MI.

DETAILED CHEMICAL ABUNDANCES IN THE<i>r</i>-PROCESS-RICH ULTRA-FAINT DWARF GALAXY RETICULUM 2

The Astronomical Journal, 151(3), 82.

DETECTION OF PHOSPHORUS, SULPHUR, AND ZINC IN THE CARBON-ENHANCED METAL-POOR STAR BD+44 493*

The Astrophysical Journal Letters.

Different Ways of Thinking about r-process observations

The r-process nucleosynthesis: connecting FRIB with the cosmos. Presented at the The r-process nucleosynthesis: connecting FRIB with the cosmos, East Lansing, MI.

Heavy Metals in Dwarf Galaxies

4th Magellan Science Symposium. Presented at the 4th Magellan Science Symposium, Washington, DC.

NEUTRON-CAPTURE ELEMENT ABUNDANCES IN MAGELLANIC CLOUD PLANETARY NEBULAE*

The Astrophysical Journal Letters.

Neutron-Capture Elements from the First Stars

First Stars V. Presented at the First Stars V, Heidelberg, Germany.

New Constraints on the r-process Provided by New Observations of Rare Elements in Metal-Poor Stars

JINA-CEE Frontiers Meeting. Presented at the JINA-CEE Frontiers Meeting, East Lansing, MI.