75 citations · 348 across the 8 of their papers we have counts for
8 papers
Discovery of very low amplitude 9-minute multiperiodic pulsations in the magnetic Ap star HD 75445
O. Kochukhov, S. Bagnulo, G. Lo Curto +1
We present our discovery of pulsational radial-velocity variations in the cool Ap star HD 75445, an object spectroscopically similar to the bright, rapidly-oscillating Ap (roAp) st…
Non-LTE line formation for Pr II and Pr III in A and Ap stars
L. Mashonkina, T. Ryabchikova, A. Ryabtsev +1
Non-LTE line formation for Pr II and Pr III is considered through a range of effective temperatures between 7250 K and 9500 K. A comprehensive model atom for Pr II/III is based on…
The discovery of high-amplitude 10.9-minute oscillations in the cool magnetic Ap star HD 115226
O. Kochukhov, T. Ryabchikova, S. Bagnulo +1
We present the discovery of pulsational variations in the cool magnetic Ap star HD 115226 -- the first high-amplitude rapidly oscillating Ap star discovered with time-series spectr…
Pulsation tomography of rapidly oscillating Ap stars. Resolving the third dimension in peculiar pulsating stellar atmospheres
T. Ryabchikova, M. Sachkov, O. Kochukhov +1
We present detailed analysis of the vertical pulsation mode cross-section in ten rapidly oscillating Ap (roAp) stars based on spectroscopic time-series observations. The aim of thi…
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…
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…