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110 papers
Metal Mixing in the R-Process Enhanced Ultra-Faint Dwarf Galaxy Reticulum II
Alexander P. Ji, Joshua D. Simon, Ian U. Roederer +9
The ultra-faint dwarf galaxy Reticulum~II was enriched by a single rare and prolific r-process event. The r-process content of Reticulum~II thus provides a unique opportunity to st…
A population of luminous globular clusters and stripped nuclei with elevated mass to light ratios around NGC 5128
Antoine Dumont, Anil C. Seth, Jay Strader +8
The dense central regions of tidally disrupted galaxies can survive as ultra-compact dwarfs (UCDs) that hide among the luminous globular clusters (GCs) in the halo of massive galax…
Metallicity Distribution Function of the Eridanus~II Ultra-Faint Dwarf Galaxy from Hubble Space Telescope Narrow-band Imaging
Sal Wanying Fu, Daniel R. Weisz, Else Starkenburg +9
We use deep narrowband Ca H&K () imaging taken with the Hubble Space Telescope (HST) to construct the metallicity distribution function (MDF) of Local Group (LG) ultra-faint…
Orbital Parameters and Binary Properties of 37 FGK stars in the Cores of Open Clusters NGC 2516 and NGC 2422
Isabel Lipartito, John I. Bailey, Timothy D. Brandt +4
We present orbits for 24 binaries in the field of open cluster NGC 2516 (~150 Myr) and 13 binaries in the field of open cluster NGC 2422 (~130 Myr) using results from a multi-year…
Stellar kinematics of dwarf galaxies from multi-epoch spectroscopy: application to Triangulum II
Rachel Buttry, Andrew B. Pace, Sergey E. Koposov +9
We present new MMT/Hectochelle spectroscopic measurements for 257 stars observed along the line of sight to the ultra-faint dwarf galaxy Triangulum II. Combining with results from…
Spectroscopic Confirmation of the Sixth Globular Cluster in the Fornax Dwarf Spheroidal Galaxy
Andrew B. Pace, Matthew G. Walker, Sergey E. Koposov +5
The Fornax dwarf spheroidal galaxy has an anomalous number of globular clusters, five, for its stellar mass. There is a longstanding debate about a potential sixth globular cluster…