60 citations · 157 across the 7 of their papers we have counts for
7 papers
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…
Absolute Ages and Distances of 22 GCs using Monte Carlo Main-Sequence Fitting
Erin M. O'Malley, Christina Gilligan, Brian Chaboyer
The recent Gaia Data Release 1 of stellar parallaxes provides ample opportunity to find metal-poor main-sequence stars with precise parallaxes. We select 21 such stars with paralla…
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…
The Power of Principled Bayesian Methods in the Study of Stellar Evolution
Ted von Hippel, David A. van Dyk, David C. Stenning +5
It takes years of effort employing the best telescopes and instruments to obtain high-quality stellar photometry, astrometry, and spectroscopy. Stellar evolution models contain the…
Update on the Cetus Polar Stream and its Progenitor
William Yam, Jeffrey L. Carlin, Heidi Jo Newberg +4
We trace the Cetus Polar Stream (CPS) with blue horizontal branch (BHB) and red giant stars (RGBs) from Data Release 8 of the Sloan Digital Sky Survey (SDSS DR8). Using a larger da…
A Bayesian Approach to Deriving Ages of Individual Field White Dwarfs
Erin M. O'Malley, Ted von Hippel, David van Dyk
We apply a self-consistent and robust Bayesian statistical approach to determining the ages, distances, and ZAMS masses of 28 field DA white dwarfs with ages of approximately 4 to…