390 citations · 911 across the 14 of their papers we have counts for
14 papers
An empirical model of the Gaia DR3 selection function
Tristan Cantat-Gaudin, Morgan Fouesneau, Hans-Walter Rix +11
Interpreting and modelling astronomical catalogues requires an understanding of the catalogues' completeness or selection function: objects of what properties had a chance to end u…
Binary parameters from astrometric and spectroscopic errors--candidate hierarchical triples and massive dark companions in Gaia DR3
Shion Andrew, Zephyr Penoyre, Vasily Belokurov +2
We show how astrometric and spectroscopic errors introduced by an unresolved binary system can be combined to give estimates of the binary period and mass ratio. This can be perfor…
Mass Segregation in the Hyades Cluster
N. Wyn Evans, Semyeong Oh
Using the Gaia colour-magnitude diagram, we assign masses to a catalogue of 979 confirmed members of the Hyades cluster and tails. By fitting the cumulative mass profile, stars wit…
Kinematic modelling of clusters with Gaia: the Death Throes of the Hyades
Semyeong Oh, N. Wyn Evans
The precision of the Gaia data offers a unique opportunity to study the internal velocity field of star clusters. We develop and validate a forward-modelling method for the interna…
Unresolved stellar companions with Gaia DR2 astrometry
Vasily Belokurov, Zephyr Penoyre, Semyeong Oh +9
For stars with unresolved companions, motions of the centre of light and that of mass decouple, causing a single-source astrometric model to perform poorly. We show that such stars…
LRP2020: The Opportunity of Young Nearby Associations with the Advent of the Gaia Mission
Jonathan Gagné, Joel Kastner, Semyeong Oh +12
This white paper proposes leveraging high-quality Gaia data available to the worldwide scientific community and complement it with support from Canadian-related facilities to place…
Spectroscopy of the Young Stellar Association Price-Whelan 1: Origin in the Magellanic Leading Arm and Constraints on the Milky Way Hot Halo
David L. Nidever, Adrian M. Price-Whelan, Yumi Choi +7
We report spectroscopic measurements of stars in the recently discovered young stellar association Price-Whelan 1 (PW 1), which was found in the vicinity of the Leading Arm (LA) of…
Kronos & Krios: Evidence for accretion of a massive, rocky planetary system in a comoving pair of solar-type stars
Semyeong Oh, Adrian M. Price-Whelan, John M. Brewer +3
We report and discuss the discovery of a comoving pair of bright solar-type stars, HD 240430 and HD 240429, with a significant difference in their chemical abundances. The two star…
Spectroscopic confirmation of very-wide stellar binaries and large-separation comoving pairs from Gaia DR1
Adrian M. Price-Whelan, Semyeong Oh, David N. Spergel
Members of widely-separated stellar binaries (> 0.1 pc) or loosely bound stellar associations and clusters are born with small spreads in kinematics and chemistry, but disrupt and…
Testing the presence of multiple photometric components in nearby early-type galaxies using SDSS
Semyeong Oh, Jenny E. Greene, Claire N. Lackner
We investigate two-dimensional image decomposition of nearby, morphologically selected early-type galaxies (ETGs). We are motivated by recent observational evidence of significant…
Comoving stars in Gaia DR1: An abundance of very wide separation co-moving pairs
Semyeong Oh, Adrian M. Price-Whelan, David W. Hogg +2
The primary sample of the {\it Gaia} Data Release 1 is the Tycho-Gaia Astrometric Solution (TGAS): 2 million Tycho-2 sources with improved parallaxes and proper motions r…
Monte Carlo Method for Calculating Oxygen Abundances and Their Uncertainties from Strong-Line Flux Measurements
Federica B. Bianco, Maryam Modjaz, Seung Man Oh +4
We present the open-source Python code pyMCZ that determines oxygen abundance and its distribution from strong emission lines in the standard metallicity calibrators, based on the…
The AGN Population in X-ray Selected Galaxy Groups at
Semyeong Oh, John S. Mulchaey, Jong-Hak Woo +6
We use Chandra data to study the incidence and properties of Active Galactic Nuclei (AGN) in 16 intermediate redshift () X-ray-selected galaxy groups in the Chandra…
The extended narrow-line region of two type-I quasi-stellar objects
Semyeong Oh, Jong-Hak Woo, Vardha N. Bennert +4
We investigate the narrow-line region (NLR) of two radio-quiet QSOs, PG1012+008 and PG1307+085, using high signal-to-noise spatially resolved long-slit spectra obtained with FORS1…