Young‐Beom Jeon
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View article: Analysis of Magma Activity during the Cerro Azul Volcanic Unrest in March 2017 Using Sentinel-1 DInSAR Observations
Analysis of Magma Activity during the Cerro Azul Volcanic Unrest in March 2017 Using Sentinel-1 DInSAR Observations Open
View article: Performance Assessment of the KASI-Deep Rolling Imaging Fast-optics Telescope pathfinder
Performance Assessment of the KASI-Deep Rolling Imaging Fast-optics Telescope pathfinder Open
In a $Λ$CDM universe, most galaxies evolve by mergers and accretions, leaving faint and/or diffuse structures, such as tidal streams and stellar halos. Although these structures are a good indicator of galaxies' recent mass assembly histor…
View article: Instabilities in Interacting Binary Stars
Instabilities in Interacting Binary Stars Open
The types of instability in the interacting binary stars are reviewed. The project "Inter-Longitude Astronomy" is a series of smaller projects on concrete stars or groups of stars. It has no special funds, and is supported from resources a…
View article: Preliminary results of variable star search using KMTNet data
Preliminary results of variable star search using KMTNet data Open
\nThe KMTNet (Korea Microlensing Telescope Network) was completed on October 2nd in 2015. There are three 1.6 m telescopes in Chile (CTIO), Australia (SSO) and South Africa (SAAO). The field of view of the CCD camera is 2 degree × 2 degree…
View article: VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER NGC 225
VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER NGC 225 Open
Through time-series BV CCD photometry of the open cluster NGC 225 region, we have detected 30 variable stars including 22 new ones. They are five ${\delta}$ Scuti-type variable stars, a slowly pulsating B star, six eclipsing binary stars a…
View article: TIME-SERIES PHOTOMETRY OF VARIABLE STARS IN THE GLOBULAR CLUSTER NGC 288
TIME-SERIES PHOTOMETRY OF VARIABLE STARS IN THE GLOBULAR CLUSTER NGC 288 Open
We present the results of BV time-series photometry of the globular cluster NGC 288. Observations were carried out to search for variable stars using the Korea Microlensing Telescope Network (KMTNet) 1.6-m telescopes and a 4k pre-science C…
View article: Metal-rich SX Phe stars in the<i>Kepler</i>field
Metal-rich SX Phe stars in the<i>Kepler</i>field Open
A spectroscopic and photometric analysis has been carried out for thirty-two\ncandidate SX_Phe variable blue straggler stars in the Kepler-field (Balona &\nNemec 2012). Radial velocities (RVs), space motions (U,V,W), projected rotation\nve…
View article: VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER NGC 1039 (M34)
VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER NGC 1039 (M34) Open
NGC 1039 영역의 변광성 탐사로부터 7개의 ${\delta}$ Scuti형 변광성, 2개의 ${\gamma}$ Doradus형 변광성, 14개의 식쌍성 및 5개의 장지기형 불규칙 변광성을 찾았다. 이 중에서 3개를 제외한 나머지는 모두 새로 발견한 것이다. 이들 중 ${\delta}$ Scuti형 변광성 4개와 ${\gamma}$ Doradus형 변광성 2개 및 장주기형 불규칙 변광성 1개는 성단구성원일 가능성이 크다.…
View article: Metal-Rich SX Phe Stars in the<i>Kepler</i>Field
Metal-Rich SX Phe Stars in the<i>Kepler</i>Field Open
High-resolution spectroscopic observations have been made for 32 of the 34 candidate SX Phe stars identified in the Kepler field by Balona & Nemec (2012). All available long- and short-cadence Q0-Q17 Kepler photometry has been analyzed for t…