367 citations · 8.3k across the 236 of their papers we have counts for
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Line profile variations in rapidly oscillating Ap stars: resolution of the enigma
O. Kochukhov, T. Ryabchikova, W. W. Weiss +2
We have carried out the first survey of the pulsational line profile variability in rapidly oscillating Ap (roAp) stars. We analysed high signal-to-noise time-series observations o…
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…
Pulsation in the atmosphere of the roAp star HD 24712. I. Spectroscopic observations and radial velocity measurements
T. Ryabchikova, M. Sachkov, W. W. Weiss +10
We have investigated the structure of the pulsating atmosphere of one of the best studied rapidly oscillating Ap stars, HD 24712. For this purpose we analyzed spectra collected dur…
3-D hydrodynamic simulations of convection in A stars
O. Kochukhov, B. Freytag, N. Piskunov +1
Broadening and asymmetry of spectral lines in slowly rotating late A-type stars provide evidence for high-amplitude convective motions. The properties of turbulence observed in the…
Chemical stratification in the atmosphere of Ap star HD 133792. Regularized solution of the vertical inversion problem
O. Kochukhov, V. Tsymbal, T. Ryabchikova +2
High spectral resolution studies of cool Ap stars reveal conspicuous anomalies of the shape and strength of many absorption lines. This is a signature of large atmospheric chemical…
Rare-earth elements in the atmosphere of the magnetic chemically peculiar star HD 144897. New classification of the Nd III spectrum
T. Ryabchikova, A. Ryabtsev, O. Kochukhov +1
We have obtained a UVES spectrum of a slowly rotating strongly magnetic Ap star, HD 144897, that exhibits very large overabundances of rare-earth elements. Here we present a detail…
Remarkable non-dipolar magnetic field of the Bp star HD 137509
O. Kochukhov
The southern magnetic Bp star HD 137509 exhibits complex rotational modulation of the longitudinal field and other magnetic observables. Interpretation of this magnetic variability…
Evolutionary state of magnetic chemically peculiar stars
O. Kochukhov, S. Bagnulo
We present a comprehensive statistical investigation of the evolution of magnetic CP stars, aimed at providing constraints to the theories that deal with the origin of the magnetic…