133 citations · 589 across the 23 of their papers we have counts for
17 papers · 1 filter
The porous envelope and circumstellar wind matter of the closest carbon star, CW Leonis
Hyosun Kim, Ho-Gyu Lee, Youichi Ohyama +5
Recent abrupt changes of CW Leonis may indicate that we are witnessing the moment that the central carbon star is evolving off the Asymptotic Giant Branch (AGB) and entering into t…
Transverse Wind Velocity Recorded in Spiral-Shell Pattern
Hyosun Kim
The propagation speed of a circumstellar pattern revealed in the plane of the sky is often assumed to represent the expansion speed of the wind matter ejected from a post-main-sequ…
Formation of the Asymmetric Accretion Disk from Stellar Wind Accretion in an S-type Symbiotic Star
Young-Min Lee, Hyosun Kim, Hee-Won Lee
The accretion process in a typical S-type symbiotic star, targeting~AG Draconis, is investigated through 3D hydrodynamical simulations using the FLASH code. Regardless of the wind…
Structure and dynamics of the inner nebula around the symbiotic stellar system R Aqr
V. Bujarrabal, M. Agundez, M. Gomez-Garrido +5
We investigate the structure, dynamics, and chemistry of the molecule-rich nebula around the stellar symbiotic system R Aqr, which is significantly affected by the presence of a wh…
Multi-epoch Optical Images of IRC+10216 Tell About the Central Star And the Adjacent Environment
Hyosun Kim, Ho-Gyu Lee, Youichi Ohyama +5
Six images of IRC+10216 taken by the Hubble Space Telescope at three epochs in 2001, 2011, and 2016 are compared in the rest frame of the central carbon star. An accurate astrometr…
Asymmetric distributions of H2O and SiO masers towards V627 Cas
Haneul Yang, Se-Hyung Cho, Youngjoo Yun +7
We performed simultaneous observations of the H2O 6(1,6) - 5(2,3) (22.235080 GHz) and SiO v= 1, 2, J = 1 - 0, SiO v = 1, J = 2 - 1, 3 - 2 (43.122080, 42.820587, 86.243442, and 129.…
The Nearby Evolved Stars Survey: I. JCMT/SCUBA-2 Sub-millimetre detection of the detached shell of U Antliae
Thavisha E. Dharmawardena, Francisca Kemper, Sundar Srinivasan +24
We present the highest resolution single-dish submillimetre observations of the detached shell source U Antliae to date. The observations were obtained at $450~\micron$ and $850~\m…
Templates of binary-induced spiral-shell patterns around mass-losing post-main sequence stars
Hyosun Kim, Sheng-Yuan Liu, Ronald E. Taam
The morphological properties of the outflowing circumstellar envelopes surrounding mass-losing stars in eccentric binary systems are presented from a set of three-dimensional hydro…
The large-scale nebular pattern of a superwind binary in an eccentric orbit
Hyosun Kim, Alfonso Trejo, Sheng-Yuan Liu +5
Preplanetary nebulae and planetary nebulae are evolved, mass-losing stellar objects that show a wide variety of morphologies. Many of these nebulae consist of outer structures that…
High-resolution CO observation of the carbon star CIT 6 revealing the spiral structure and a nascent bipolar outflow
Hyosun Kim, Sheng-Yuan Liu, Naomi Hirano +8
CIT 6 is a carbon star in the transitional phase from the asymptotic giant branch (AGB) to the protoplanetary nebulae (pPN). Observational evidences of two point sources in the opt…
HST Images Reveal Dramatic Changes in the Core of IRC+10216
Hyosun Kim, Ho-Gyu Lee, Nicolas Mauron +1
IRC+10216 is the nearest carbon star with a very high mass-loss rate. The existence of a binary companion has been hinted by indirect observational evidence, such as the bipolar mo…
Evidence of a Binary-Induced Spiral from an Incomplete Ring Pattern of CIT 6
Hyosun Kim, I-Ta Hsieh, Sheng-Yuan Liu +1
With the advent of high-resolution high-sensitivity observations, spiral patterns have been revealed around several asymptotic giant branch (AGB) stars. Such patterns can provide p…
High-Contrast Near-Infrared Imaging Polarimetry of the Protoplanetary Disk around RY Tau
Michihiro Takami, Jennifer L. Karr, Jun Hashimoto +50
We present near-infrared coronagraphic imaging polarimetry of RY Tau. The scattered light in the circumstellar environment was imaged at H-band at a high resolution (~0".05) for th…
A New Method of Determining the Characteristics of Evolved Binary Systems Revealed in the Observed Circumstellar Patterns: Application to AFGL 3068
Hyosun Kim, Ronald E. Taam
The binary characteristics of asymptotic giant branch (AGB) stars are imprinted in the asymmetric patterns of their circumstellar envelopes. We develop a simple method for constrai…
Wide Binary Effects on Asymmetries in Asymptotic Giant Branch Circumstellar Envelopes
Hyosun Kim, Ronald E. Taam
Observations of increasingly higher spatial resolution reveal the existence of asymmetries in the circumstellar envelopes of a small fraction of asymptotic giant branch (AGB) stars…
Probing Substellar Companions of AGB Stars through Spirals and Arcs
Hyosun Kim, Ronald E. Taam
Recent observations of strikingly well-defined spirals in the circumstellar envelopes of asymptotic giant branch (AGB) stars point to the existence of binary companions in these ob…
The Interaction of Planets and Brown Dwarfs with AGB Stellar Winds
Hyosun Kim, Ronald E. Taam
Beyond the main sequence solar type stars undergo extensive mass loss, providing an environment where planet and brown dwarf companions interact with the surrounding material. To e…