422 citations · 4.4k across the 64 of their papers we have counts for
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Evidence for a Sub-Chandrasekhar Mass Type~Ia Supernova in the Ursa Minor Dwarf Galaxy
Andrew McWilliam, Anthony L. Piro, Carles Badenes +1
A longstanding problem is identifying the elusive progenitors of Type Ia supernovae (SNe Ia), which can roughly be split into Chandraksekhar and sub-Chandrasekhar mass events. An i…
APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy
Sten Hasselquist, Matthew Shetrone, Verne Smith +23
The Apache Point Observatory Galactic Evolution Experiment (APOGEE) provides the opportunity to measure elemental abundances for C, N, O, Na, Mg, Al, Si, P, K, Ca, V, Cr, Mn, Fe, C…
High Resolution Spectroscopic Abundances of Red Giant Branch Stars in NGC 6681
Erin M. O'Malley, Alexei Kniazev, Andrew McWilliam +1
We obtain high resolution spectra of nine red giant branch stars in NGC 6681 and perform the first detailed abundance analysis of stars in this cluster. We confirm cluster membersh…
A Differential Abundance Analysis of Very Metal-Poor Stars
Erin O'Malley, Andrew McWilliam, Brian Chaboyer +1
We have performed a differential, line-by-line, chemical abundance analysis, ultimately relative to the Sun, of nine very metal-poor main sequence halo stars, near [Fe/H]=2 dex.…
Testing Metal Poor Stellar Models and Isochrones with HST Parallaxes of Metal Poor Stars
B. Chaboyer, B. E. McArthur, E. O'Malley +7
Hubble Space Telescope (HST) fine guidance sensor observations were used to obtain parallaxes of eight metal-poor ([Fe/H] < -1.4) stars. The parallaxes of these stars determined by…
Chemical Abundances of Two Stars in the Large Magellanic Cloud Globular Cluster NGC~1718
Charli Sakari, Andrew McWilliam, George Wallerstein
Detailed chemical abundances of two stars in the intermediate-age Large Magellanic Cloud (LMC) globular cluster NGC~1718 are presented, based on high resolution spectroscopic obser…