Search Publications

207 New Open Star Clusters within 1 kpc from Gaia Data Release 2

Sim, Gyuheon; Lee, Sang Hyun; Ann, Hong Bae +1 more

We conducted a survey of open clusters within 1 kpc from the Sun using the astrometric and photometric data of the Gaia Data Release 2. We found 655 cluster candidates by visual inspection of the stellar distributions in proper motion space and spatial distributions in l-b space. All of the 655 cluster candidates have a well defined main-sequence …

Origin and Status of Low-Mass Candidate Hypervelocity Stars

Koo, Jae-Rim; Beers, Timothy C.; Lee, Young Sun +2 more

We present an analysis of the chemical abundances and kinematics of six low-mass dwarf stars, previously claimed to be candidate hypervelocity stars (HVSs). We obtained moderate-resolution (R=6000) spectra of these stars to estimate the abundances of several chemical elements (Mg, Si, Ca, Ti, Cr, Fe, and Ni), and derived their space velocities and…