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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 …
Investigating the Pulsar Wind Nebula 3C 58 Using Emission Models
An, Hongjun; Park, Jaegeun; Kim, Seungjong
We present IR flux density measurements, models of the broadband SED, and results of SED modeling for the Pulsar Wind Nebula (PWN) 3C 58. We find that the Herschel flux density seems to be slightly lower than suggested by interpolation of previous measurements in nearby wavebands, implying that there may be multiple electron populations in 3C 58. …
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…