205 citations · 705 across the 41 of their papers we have counts for
42 papers
BS Cassiopeiae: A Contact Binary with Starspot-Driven Variability and Evidence for Additional Components
Min-Ji Jeong, Chun-Hwey Kim, Kyeongsoo Hong +5
We present a comprehensive photometric and spectroscopic analysis of the contact eclipsing binary BS Cas, based on 22-yr multi-site light curves and 2-yr high-resolution spectra. T…
The Double-lined Eclipsing Doradus System AX Draconis in a 0.568-day Orbit
Jae Woo Lee, Min-Ji Jeong, Kyeongsoo Hong +3
For the near-contact binary AX Dra, we present the first time-series spectroscopy collected with the echelle spectrograph BOES. From spectral analysis, we measured the projected ro…
TIC 322208686: An Eclipsing System with Doradus Pulsations and a Third Component on a Wider Orbit
Jae Woo Lee, Kyeongsoo Hong, Min-Ji Jeong +3
TIC 322208686 is known to be a detached binary that exhibits two types of variability: pulsation and eclipse. We present the physical properties of the target star using the short-…
KMTNet View of Blue Large-amplitude Pulsators Toward the Galactic Bulge: I. Discovery of Wide-orbit Companions in OGLE-BLAP-006
Seung-Lee Kim, Chung-Uk Lee, Kyeongsoo Hong +6
Blue large-amplitude pulsators (BLAPs), a recently classified type of variable stars, are evolved objects likely formed through interactions between stars in a binary system. Howev…
Pulsations and Pre-He White Dwarf in the Post-mass Transfer Eclipsing System WASP 1021-28
Jae Woo Lee, Min-Ji Jeong, Kyeongsoo Hong
We present results from VLT/UVES spectra and TESS photometric observations of the pulsating EL CVn binary WASP 1021-28, containing a He-core white dwarf precursor (pre-He WD). Doub…
WASP 0346-21: An EL CVn-Type Eclipsing Binary with Multiperiodic Pulsations in a Triple System
Jae Woo Lee, Kyeongsoo Hong, Min-Ji Jeong +1
VLT/UVES spectroscopic and TESS photometric observations for WASP 0346-21 allow the direct determination of its physical properties, along with the detection of a circumbinary obje…
Absolute Properties of the Oscillating Eclipsing Algol XZ Ursae Majoris
Jae Woo Lee, Kyeongsoo Hong, Hye-Young Kim +3
It is known from archival TESS data that the semi-detached Algol system XZ UMa is one of the candidate binary stars exhibiting short-period oscillations. We secured new high-resolu…
Improved period variations of 32 contact binaries with rapidly decreasing periods in the Galactic Bulge
Kyeongsoo Hong, Jae Woo Lee, Dong-Jin Kim +4
We present detailed analyses of updated eclipse timing diagrams for 32 contact binary merger candidates in the Galactic bulge. The photometric data was obtained from 2016 to 2021 u…
Photometric and Spectroscopic Properties of the Eclipsing System V864 Monocerotis
Jang-Ho Park, Jae Woo Lee, Kyeongsoo Hong
We present the orbital period variability and evolutionary status of the W UMa-type binary system V864 Mon from accurately measured fundamental parameters. New photometric obs…
Absolute Properties of the Oscillating Eclipsing Algol X Trianguli
Jae Woo Lee, Kyeongsoo Hong, Jang-Ho Park +2
We report results from the TESS photometric data and new high-resolution spectra of the Algol system X Tri showing short-period pulsations. From the echelle spectra, the radial vel…
A Photometric and Spectroscopic Study of the Short-Period Algol EW Boötis with a Sct Pulsator
Hye-Young Kim, Kyeongsoo Hong, Chun-Hwey Kim +4
In this paper, we present TESS photometry and high-resolution spectra of the short-period Algol EW Boo. We obtained double-lined radial velocities (RVs) from the time-series spectr…
The Pre-He White Dwarfs in Eclipsing Binaries. IV. WASP 1814+48 with Multiperiodic Pulsations
Jae Woo Lee, Kyeongsoo Hong, Hye-Young Kim +1
For the EL CVn candidate 1SWASPJ181417.43+481117.0 (WASP 1814+48), we secured the first spectroscopic observations between 2015 April and 2021 March. Using the echelle spectra, the…
Period Changes of 14,127 Contact Eclipsing Binaries in the Galactic Bulge
Kyeongsoo Hong, Jae Woo Lee, Jang-Ho Park +5
We present the orbital period variations of 14,127 contact eclipsing binaries (CEBs) based on the OGLE-III\&IV observations in the Galactic bulge. New times of minimum lights for t…
The Pre-He White Dwarfs in Eclipsing Binaries. III. WASP 1625-04
Jae Woo Lee, Kyeongsoo Hong, Jang-Ho Park
1SWASP J162545.15-043027.9 (WASP 1625-04) has been announced as one of EL CVn candidates showing total primary eclipses and ellipsoidal variations. This paper presents the absolute…
TESS Eclipsing Binary Stars. I. Short cadence observations of 4584 eclipsing binaries in Sectors 1-26
Andrej Prsa, Angela Kochoska, Kyle E. Conroy +44
In this paper we present a catalog of 4584 eclipsing binaries observed during the first two years (26 sectors) of the TESS survey. We discuss selection criteria for eclipsing binar…
Pulsation and Rotation of the EL CVn-type Eclipsing Binary 1SWASP J024743.37-251549.2
Seung-Lee Kim, Jae Woo Lee, Chung-Uk Lee +6
EL CVn-type eclipsing binaries are composed of a massive A-type main-sequence primary star and a hotter B-type secondary star. This paper presents the time-series photometric and a…
Tidally Excited Modes and Scuti Pulsations in the Eclipsing Triple Star IM Persei
Jae Woo Lee, Kyeongsoo Hong, Hye-Young Kim
IM Per is a triple star system whose eclipsing pair masses and radii are accurate to within 1 \%. The TESS light curve of the program target exhibits partial eclipses and multiple…
Cephei Pulsations in the High-mass Eclipsing System CW Cephei
Jae Woo Lee, Kyeongsoo Hong
CW Cep is an early B-type eclipsing binary with mass measurement precisions better than 1 \%. We report the discovery of pulsation signatures in the TESS time-series data of the sy…
Physical Nature of the Eclipsing δ Scuti Star AO Serpentis
Jang-Ho Park, Jae Woo Lee, Kyeongsoo Hong +2
We present the absolute properties of the eclipsing binary AO Ser with a pulsating component from our photometric and high-resolution spectroscopic observations, which were pe…
The Pre-He White Dwarfs in Eclipsing Binaries. I. WASP 0131+28
Jae Woo Lee, Jae-Rim Koo, Kyeongsoo Hong +1
We report the first light curves and high-resolution spectra of the post-mass transfer binary star WASP 0131+28 to study the absolute properties of extremely low-mass white dw…
TESS Photometry of the Eclipsing Scuti Star AI Hydrae
Jae Woo Lee, Kyeongsoo Hong, Martti H. Kristiansen
AI Hya has been known as an eclipsing binary with a monoperiodic Sct pulsator. We present the results from its {\it TESS} photometry observed during Sector 7. Including our fiv…
Absolute Properties of the Eclipsing Dor Star V404 Lyrae
Jae Woo Lee, Kyeongsoo Hong, Jae-Rim Koo +1
We present the first high-resolution spectra for the eclipsing binary V404 Lyr showing Dor pulsations, which we use to study its absolute properties. By fitting models to the d…
OGLE-2018-BLG-1011L\lowercase{b,c}: Microlensing Planetary System with Two Giant Planets Orbiting a Low-mass Star
Cheongho Han, David P. Bennett, Andrzej Udalski +70
We report a multiplanetary system found from the analysis of microlensing event OGLE-2018-BLG-1011, for which the light curve exhibits a double-bump anomaly around the peak. We fin…
Spectroscopic Mass and Host-star Metallicity Measurements for Newly Discovered Microlensing Planet OGLE-2018-BLG-0740Lb
Cheongho Han, Jennifer C. Yee, Andrzej Udalski +63
We report the discovery of the microlensing planet OGLE-2018-BLG-0740Lb. The planet is detected with a very strong signal of , but the interpretation of the signal s…