514 citations · 4.4k across the 62 of their papers we have counts for
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CN and CO Features: Key Indicators of Red Giant Evolutionary Phase in Moderate-Resolution X-Shooter Spectra
Kirsten A. Banks, Chantel Y. Y. Ho, Sarah L. Martell +6
Data-driven analysis methods can help to infer physical properties of red giant stars where "gold-standard" asteroseismic data are not available. The study of optical and infrared…
A red giant orbiting a black hole
Kareem El-Badry, Hans-Walter Rix, Yvette Cendes +18
We report spectroscopic and photometric follow-up of a dormant black hole (BH) candidate from Gaia DR3. The system, which we call Gaia BH2, contains a red giant a…
The Active Chromospheres of Lithium-Rich Red Giant Stars
Christopher Sneden, Melike Afsar, Zeynep Bozkurt +17
We have gathered near-infrared -band high resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their \species{He}{i} 1083…
A Sun-like star orbiting a black hole
Kareem El-Badry, Hans-Walter Rix, Eliot Quataert +18
We report discovery of a bright, nearby () Sun-like star orbiting a dark object. We identified the system as a black hole candidate via its astrometri…
The Galactic Distribution of Phosphorus: A Survey of 163 Disk and Halo Stars
Z. G. Maas, K. Hawkins, N. R. Hinkel +3
Phosphorus (P) is a critical element for life on Earth yet the cosmic production sites of P are relatively uncertain. To understand how P has evolved in the solar neighborhood, we…
The Chemical Composition of Extreme-Velocity Stars
Henrique Reggiani, Alexander P. Ji, Kevin C. Schlaufman +5
Little is known about the origin of the fastest stars in the Galaxy. Our understanding of the Milky Way and surrounding dwarf galaxies chemical evolution history allows us to use t…
The detailed chemical abundance patterns of accreted halo stars from the optical to infrared
Andreia Carrillo, Keith Hawkins, Paula Jofré +3
Understanding the assembly of our Galaxy requires us to also characterize the systems that helped build it. In this work, we accomplish this by exploring the chemistry of accreted…
Distant Relatives: The Chemical Homogeneity of Comoving Pairs Identified in Gaia
Tyler Nelson, Yuan-Sen Ting, Keith Hawkins +3
Comoving pairs, even at the separations of AU, are a predicted reservoir of conatal stars. We present detailed chemical abundances of 62 stars in 31 comoving p…
Chemical Compositions of Red Giant Stars from Habitable Zone Planet Finder Spectroscopy
Christopher Sneden, Melike Afsar, Zeynep Bozkurt +15
We have used the Habitable Zone Planet Finder (HPF) to gather high resolution, high signal-to-noise near-infrared spectra of 13 field red horizontal-branch (RHB) stars, one open-cl…
From the Inner to Outer Milky Way: A Photometric Sample of 2.6 Million Red Clump Stars
Madeline Lucey, Yuan-Sen Ting, Nesar S. Ramachandra +1
Large pristine samples of red clump stars are highly sought after given that they are standard candles and give precise distances even at large distances. However, it is difficult…
Identical or fraternal twins? : The chemical homogeneity of wide binaries from Gaia DR2
Keith Hawkins, Madeline Lucey, Yuan-Sen Ting +7
One of the high-level goals of Galactic archaeology is chemical tagging of stars across the Milky Way to piece together its assembly history. For this to work, stars born together…
Know thy star, know thy planet: Chemo-kinematically characterizing TESS targets
Andreia Carrillo, Keith Hawkins, Brendan P. Bowler +2
The Transiting Exoplanet Survey Satellite (TESS) has already begun to discover what will ultimately be thousands of exoplanets around nearby cool bright stars. These potential host…
The Kepler Smear Campaign: Light curves for 102 Very Bright Stars
Benjamin J. S. Pope, Guy R. Davies, Keith Hawkins +19
We present the first data release of the Kepler Smear Campaign, using collateral 'smear' data obtained in the Kepler four-year mission to reconstruct light curves of 102 stars too…
Testing asteroseismology with Gaia DR2: Hierarchical models of the Red Clump
Oliver J. Hall, Guy R. Davies, Yvonne P. Elsworth +8
Asteroseismology provides fundamental stellar parameters independent of distance, but subject to systematics under calibration. Gaia DR2 has provided parallaxes for a billion stars…
The COMBS survey I: Chemical Origins of Metal-Poor Stars in the Galactic Bulge
Madeline Lucey, Keith Hawkins, Melissa Ness +7
Chemistry and kinematic studies can determine the origins of stellar population across the Milky Way. The metallicity distribution function of the bulge indicates that it comprises…
Constraining Metallicity-dependent Mixing and Extra Mixing using [C/N] in Alpha-Rich Field Giants
Matthew Shetrone, Jamie Tayar, Jennifer A. Johnson +11
Internal mixing on the giant branch is an important process which affects the evolution of stars and the chemical evolution of the galaxy. While several mechanisms have been propos…
Pushing Automated Abundance Derivations Into the Cool Star Regime: A Test Using Three G and Two K Stars in Praesepe
Marwan Gebran, Marcel A. Agüeros, Keith Hawkins +2
We present the results of an abundance analysis of three G and two K dwarfs in the Praesepe open cluster based on high-resolution, moderate signal-to-noise-ratio spectra obtained w…
The Gaia FGK benchmark stars version 2.1
Paula Jofre, Ulrike Heiter, Marcelo Tucci Maia +5
The Gaia FGK benchmark stars are among the preferred samples of reference stars to test parametrisation pipelines of spectroscopic surveys. They consist of a small but carefully se…
The Fastest Travel Together: Chemical Tagging of the Fastest Stars in Gaia DR2 to the Stellar Halo
Keith Hawkins, Rosemary F. G. Wyse
The fastest moving stars provide insight into several fundamental properties of the Galaxy, including the escape velocity as a function of Galactocentric radius, the total mass, an…
An Ultraviolet-Optical Color-Metallicity relation for Red Clump Stars using GALEX and Gaia
Steven Mohammed, David Schiminovich, Keith Hawkins +3
Although core helium-burning red clump (RC) stars are faint at ultraviolet wavelengths, their ultraviolet-optical color is a unique and accessible probe of their physical propertie…
A large and pristine sample of standard candles across the Milky Way: ~100,000 red clump stars with 3% contamination
Yuan-Sen Ting, Keith Hawkins, Hans-Walter Rix
Core helium-burning red clump (RC) stars are excellent standard candles in the Milky Way. These stars may have more precise distance estimates from spectrophotometry than from Gaia…
Photospheric diagnostics of core helium burning in giant stars
Keith Hawkins, Yuan-Sen Ting, Hans-Walter Rix
Core helium burning primary red clump (RC) stars are evolved red giant stars which are excellent standard candles. As such, these stars are routinely used to map the Milky Way or d…
Climbing the cosmic ladder with stellar twins in RAVE with Gaia
P. Jofre, G. Traven, K. Hawkins +17
We apply the twin method to determine parallaxes to 232,545 stars of the RAVE survey using the parallaxes of Gaia DR1 as a reference. To search for twins in this large dataset, we…
The Gaia-ESO Survey: Galactic evolution of sulphur and zinc
S. Duffau, E. Caffau, L. Sbordone +48
Due to their volatile nature, when sulfur and zinc are observed in external galaxies, their determined abundances represent the gas-phase abundances in the interstellar medium. Thi…