Zoe Hackshaw
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View article: Exploring the History of Stellar Mergers with Chemistry: Examining the Origins of Massive <i>α</i> -enriched Stars Using Carbon Isotope Ratios
Exploring the History of Stellar Mergers with Chemistry: Examining the Origins of Massive <i>α</i> -enriched Stars Using Carbon Isotope Ratios Open
Recently discovered massive α -enriched (MAE) stars have surface chemistry consistent with members of the older, thick-disk Milky Way population but high masses (∼1.5–3 M ⊙ ) that suggest these stars are young. The origin of MAE stars is n…
View article: Optical Spectroscopy Reveals Hidden Neutron-capture Elemental Abundance Differences among APOGEE-identified Chemical Doppelgängers*
Optical Spectroscopy Reveals Hidden Neutron-capture Elemental Abundance Differences among APOGEE-identified Chemical Doppelgängers* Open
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 for this task. However, APOGEE lacks access to strong lines …
View article: The Nineteenth Data Release of the Sloan Digital Sky Survey
The Nineteenth Data Release of the Sloan Digital Sky Survey Open
Mapping the local and distant Universe is key to our understanding of it. For decades, the Sloan Digital Sky Survey (SDSS) has made a concerted effort to map millions of celestial objects to constrain the physical processes that govern our…
View article: [X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE
[X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE Open
Chemical cartography of the Galactic disk provides insights into its structure and assembly history over cosmic time. In this work, we use chemical cartography to explore chemical gradients and azimuthal substructure in the Milky Way disk …
View article: Discovery of a Metal-poor Red Giant Star with the Highest Ultralithium Enhancement
Discovery of a Metal-poor Red Giant Star with the Highest Ultralithium Enhancement Open
We present the discovery of 2MASS J05241392−0336543 (hereafter J0524−0336), a very metal-poor ([Fe/H] = −2.43 ± 0.16), highly r -process-enhanced ([Eu/Fe] = +1.34 ± 0.10) Milky Way halo field red giant star, with an ultrahigh Li abundance …
View article: [X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE
[X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE Open
Chemical cartography of the Galactic disk provides insights to its structure and assembly history over cosmic time. In this work, we use chemical cartography to explore chemical gradients and azimuthal substructure in the Milky Way disk wi…
View article: Uranium Abundances and Ages of r-process Enhanced Stars with Novel U ii Lines*
Uranium Abundances and Ages of r-process Enhanced Stars with Novel U ii Lines* Open
The ages of the oldest stars shed light on the birth, chemical enrichment, and chemical evolution of the universe. Nucleocosmochronometry provides an avenue to determining the ages of these stars independent from stellar-evolution models. …
View article: Uranium Abundances and Ages of $R$-process Enhanced Stars with Novel U II Lines
Uranium Abundances and Ages of $R$-process Enhanced Stars with Novel U II Lines Open
The ages of the oldest stars shed light on the birth, chemical enrichment, and chemical evolution of the Universe. Nucleocosmochronometry provides an avenue to determining the ages of these stars independent from stellar evolution models. …
View article: Discovery of a Metal-Poor Red Giant Star with the Highest Ultra-Lithium Enhancement
Discovery of a Metal-Poor Red Giant Star with the Highest Ultra-Lithium Enhancement Open
We present the discovery of 2MASS J05241392-0336543 (hereafter J0524-0336), a very metal-poor ([Fe/H]=-2.43 +- 0.16), highly r-process-enhanced ([Eu/Fe]= +1.34 +- 0.10) Milky Way halo field red giant star, with an ultra high Li abundance o…