103 citations · 871 across the 43 of their papers we have counts for
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Rotation and surface abundance peculiarities in A-type stars
Yoichi Takeda, Inwoo Han, Dong-Il Kang +2
In an attempt of clarifying the connection between the photospheric abundance anomalies and the stellar rotation as well as of exploring the nature of "normal A" stars, the abundan…
The pecular magnetic field morphology of the white dwarf WD 1953-011: evidence for a large-scale magnetic flux tube?
G. Valyavin, G. A. Wade, S. Bagnulo +4
We present and interpret new spectropolarimetric observations of the magnetic white dwarf WD 1953-011. Circular polarization and intensity spectra of the H spectral line demonst…
Precise Radial Velocities of Polaris: Detection of Amplitude Growth
Byeong-Cheol Lee, David. E. Mkrtichian, Inwoo Han +2
We present a first results from a long-term program of a radial velocity study of Cepheid Polaris (F7 Ib) aimed to find amplitude and period of pulsations and nature of secondary p…
The BOES spectropolarimeter for Zeeman measurements of stellar magnetic fields
Kang-Min Kim, Inwoo Han, Gennady G. Valyavin +9
We introduce a new polarimeter installed on the high-resolution fiber-fed echelle spectrograph (called BOES) of the 1.8-m telescope at the Bohyunsan Optical Astronomy Observatory,…
The Lorentz force in atmospheres of CP stars: Aurigae
D. Shulyak, G. Valyavin, O. Kochukhov +7
Several dynamical processes may induce considerable electric currents in the atmospheres of magnetic chemically peculiar (CP) stars. The Lorentz force, which results from the inter…
A search for kilogauss magnetic fields in white dwarfs and hot subdwarf stars
G. Valyavin, S. Bagnulo, S. Fabrika +4
We present new results of a survey for weak magnetic fields among DA white dwarfs with inclusion of some brighter hot subdwarf stars. We have detected variable circular polarizatio…