27 citations · 71 across the 12 of their papers we have counts for
9 papers · 1 filter
Hybrid star HD 81817 accompanied by brown dwarf or substellar companion
Tae-Yang Bang, Byeong-Cheol Lee, V. Perdelwitz +4
HD 81817 is known as a hybrid star. Hybrid stars have both cool stellar wind properties and Ultraviolet (UV) or even X-ray emission features of highly ionized atoms in their spectr…
Do Hertzsprung-Gap Stars Show Any Chemical Anomaly?
Yoichi Takeda, Gwanghui Jeong, Inwoo Han
With an aim to investigate how the surface abundances of intermediate-mass stars off the main sequence (evolving toward the red-giant stage) are affected by the evolution-induced e…
Luminosity effect of O I 7771-5 triplet and atmospheric microturbulence in evolved A-, F-, and G-type stars
Yoichi Takeda, Gwanghui Jeong, Inwoo Han
It is known that the strength of neutral oxygen triplet lines at 7771-5 A shows a luminosity effect in evolved A through G stars. However, its general behavior across the HR diagra…
Magnetic field and radial velocities of the star Chi Draconis A
Byeong-Cheol Lee, D. Gadelshin, Inwoo Han +13
We present high-resolution spectropolarimetric observations of the spectroscopic binary Chi Dra. Spectral lines in the spectrum of the main component Chi Dra A show variable Zeeman…
Search for Exoplanets around Northern Circumpolar Stars- II. The Detection of Radial Velocity Variations in M Giant Stars HD 36384, HD 52030, and HD 208742
Byeong-Cheol Lee, Gwanghui Jeong, Myeong-Gu Park +8
We present the detection of long-period RV variations in HD 36384, HD 52030, and HD 208742 by using the high-resolution, fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES)…
Long-period variations in the radial velocity of spectroscopic binary m giant mu ursae majoris
Byeong-Cheol Lee, Inwoo Han, Myeong-Gu Park +4
We report that the spectroscopic binary ? Ursae Majoris (?mu UMa) has secondary RV variations of 471.2 days in addition to those of 230.0 days already known. Keplerian orbit analys…
Sejong open cluster survey (SOS) - V. The active star forming region Sh 2-255 -- 257
Beomdu Lim, Hwankyung Sung, Hyeonoh Hur +6
There is much observational evidence that active star formation is taking place in the HII regions Sh 2-255 -- 257. We present a photometric study of this star forming region (SFR)…
Search for exoplanet around northern circumpolar stars - Four planets around HD 11755, HD 12648, HD 24064, and 8 Ursae Minoris
B. -C. Lee, M. -G. Park, S. -M. Lee +7
Aims. This program originated as the north pole region extension of the established exoplanet survey using 1.8 m telescope at Bohyunsan Optical Astronomy Observatory (BOAO). The ai…
Planetary companion in K giant Sigma Persei
Byeong-Cheol Lee, Inwoo Han, Myeong-Gu Park +4
We report the detection of an exoplanet candidate in orbit around sigma Persei from a radial velocity (RV) survey. The system exhibits periodic RV variations of 579.8 +/- 2.4 days.…