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UBVRcIc photometry of FHB and metal-poor stars
We report broadband UBV and/or BVR_C_I_C_ CCD photometry for a total of 1857 stars in the thick-disk and halo populations of the Galaxy. The majority of our targets were... -
UBV photometry of metal-weak candidates
We present photoelectric UBV photometry for some 2600 metal-poor dwarf and giant candidates selected from the HK objective-prism/interference-filter survey of Beers and... -
High-res. MIKE obs. of metal-poor stars
Extensive progress has recently been made in our understanding of heavy-element production via the r-process in the universe, specifically with the first observed neutron star... -
Spectroscopy of low-metallicity star candidates
We present results from an observing campaign to identify low-metallicity stars in the Best & Brightest Survey. From medium-resolution (R~1200-2000) spectroscopy of 857... -
RPA Southern Pilot Search of 107 Stars
The recent detection of a binary neutron star merger and the clear evidence for the decay of radioactive material observed in this event have, after 60 years of effort, provided... -
Properties of metal-poor stars in APOGEE DR13
We find two chemically distinct populations separated relatively cleanly in the [Fe/H]-[Mg/Fe] plane, but also distinguished in other chemical planes, among metal-poor stars... -
The Carnegie-Chicago Hubble Program. II. IC 1613
IC 1613 is an isolated dwarf galaxy within the Local Group. Low foreground and internal extinction, low metallicity, and low crowding make it an invaluable testbed for the... -
Carbon-enhanced metal-poor stars
We revisit the observed frequencies of carbon-enhanced metal-poor (CEMP) stars as a function of the metallicity in the Galaxy, using data from the literature with available... -
Metal-poor stars in the thick disk of the Galaxy
A new set of very high signal-to-noise (S/N>100/1), medium-resolution (R~3000) optical spectra have been obtained for 302 of the candidate "weak-metal" stars selected by... -
NGC 6218 and NGC 5904 lithium abundances
Convergent lines of evidence suggest that globular clusters host multiple stellar populations. It appears that they experience at least two episodes of star formation whereby a... -
Candidate halo wide binaries
We present an improved catalog of halo wide binaries compiled from an extensive literature search. Most of our binaries stem from the common proper motion binary catalogs by... -
EW measurements of 6 Segue 1 red giants
We present Magellan/MIKE and Keck/HIRES high-resolution spectra of six red giant stars in the dwarf galaxy Segue 1. Including one additional Segue 1 star observed by Norris et... -
RR Lyrae variables in M32 and M31
We observed two fields near M32 with the Advanced Camera for Surveys/High Resolution Channel (ACS/HRC) on board the Hubble Space Telescope. The main field, F1, is 1.8' from the... -
La and Eu abundances in 85 stars
From newly obtained high-resolution, high signal-to-noise ratio spectra the abundances of the elements La and Eu have been determined over the stellar metallicity range... -
Oxygen in Pleiades and M34 dwarfs
We analyze the high-excitation O I {lambda}7774 triplet in high-resolution, moderate signal-to-noise ratio spectra of 15 Pleiades and eight M34 open cluster dwarfs over the... -
Teff and log(g) of low-metallicity stars
We explore the application of artificial neural networks (ANNs) for the estimation of atmospheric parameters (T_eff_, log(g), and [Fe/H]) for Galactic F- and G-type stars. The... -
The r-process enriched giant HD 115444
New high-resolution, very high signal-to-noise spectra of ultrametal-poor (UMP) giant stars HD 115444 and HD 122563 have been gathered with the High-Resolution Echelle... -
Chemical abundances for 5 stars in Tucana II
We present chemical abundances and velocities of five stars between 0.3 and 1.1kpc from the center of the TucanaII ultrafaint dwarf galaxy (UFD) from high-resolution... -
Chemical abundances for 15 extreme-velocity stars
Little is known about the origin of the fastest stars in the Galaxy. Our understanding of the chemical evolution history of the Milky Way and surrounding dwarf galaxies allows... -
Low-mass fast rotators in the solar neighborhood
The K2 mission is targeting large numbers of nearby (d<100 pc) GKM dwarfs selected from the SUPERBLINK proper motion survey ({mu}>40 mas/yr, V<20). Additionally, the...