5 papers
A Detailed Chemical Analysis of the Red Giant Orbiting the Black Hole BH3: From Lithium to Thorium
Zoe Hackshaw, Keith Hawkins, Catherine Manea
Preliminary astrometric data from the fourth data release of the mission revealed a 33 M dark companion to a metal-poor red giant star, deemed BH3. This sys…
Barium Stars Across the Milky Way: Probing Their Origins via the GALAH Survey
Jaden Levine, Catherine Manea, Keith Hawkins +4
Barium stars are unusually enriched in barium ([Ba/Fe] >= 1.0 dex) and not predicted by current Galactic chemical evolution models. Previous observations of barium stars have found…
Dynamical Origins of Azimuthal Metallicity Variations in the Galactic Disk: Insights from Kinematic Ridges with Gaia
Carlos Jurado, Keith Hawkins, Jason A. S. Hunt +4
Kinematic and spectroscopic studies in the past few years have revealed coherent azimuthal metallicity variations across the Milky Way's disk that may be the result of dynamical pr…
Exploring the History of Stellar Mergers with Chemistry: Examining the Origins of Massive -Enriched Stars using Carbon Isotope Ratios
Zachary G. Maas, Keith Hawkins, Jeffrey M. Gerber +2
Recently discovered massive -enriched (MAE) stars have surface chemistry consistent with members of the older thick disk Milky Way population but high masses ( 1.5 - 3 M$…
Optical Spectroscopy Reveals Hidden Neutron-capture Elemental Abundance Differences among APOGEE-identified Chemical Doppelgängers
Catherine Manea, Melissa Ness, Keith Hawkins +9
Grouping stars by chemical similarity has the potential to reveal the Milky Way's evolutionary history. The APOGEE stellar spectroscopic survey has the resolution and sensitivity f…