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44 papers
New Photometric Pipeline to Explore Temporal and Spatial Variability with KMTNet DEEP-South Observations
Seo-Won Chang, Yong-Ik Byun, Min-Su Shin +6
The DEEP-South photometric census of small Solar System bodies produces massive time-series data of variable, transient or moving objects as a by-product. To fully investigate unex…
Repetitive Patterns in Rapid Optical Variations in the Nearby Black-hole Binary V404 Cygni
Mariko Kimura, Keisuke Isogai, Taichi Kato +65
How black holes accrete surrounding matter is a fundamental, yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion…
A New Catalog of Variable Stars in the Field of the Open Cluster M37
S. -W. Chang, Y. -I. Byun, J. D. Hartman
We present a comprehensive re-analysis of stellar photometric variability in the field of the open cluster M37 following the application of a new photometry and de-trending method…
A New Method For Robust High-Precision Time-Series Photometry From Well-Sampled Images: Application to Archival MMT/Megacam Observations of the Open Cluster M37
S. -W. Chang, Y. -I. Byun, J. D. Hartman
We introduce new methods for robust high-precision photometry from well-sampled images of a non-crowded field with a strongly varying point-spread function. For this work, we used…
Rotational properties of Maria asteroid family
Myung-Jin Kim, Young-Jun Choi, Hong-Kyu Moon +13
Maria family is regarded as an old-type (~3 +/- 1 Gyr) asteroid family which has experienced substantial collisional and dynamical evolution in the Main-belt. It is located nearby…
Statistical Properties of Galactic δ Scuti Stars: Revisited
Seo-Won Chang, Pavlos Protopapas, Dae-Won Kim +1
We present statistical characteristics of 1,578 δ Scuti stars including nearby field stars and cluster member stars within the Milky Way. We obtained 46% of these stars (718 stars)…