81 citations · 1.4k across the 56 of their papers we have counts for
56 papers
Are the surface abundance structures stable in rapidly rotating Ap star 56 Ari?
I. Potravnov, N. Piskunov, T. Ryabchikova
The surface magnetic and abundance inhomogeneities in chemically peculiar Ap/Bp stars are coupled and responsible for their rotationally modulated variability. Within the framework…
Doppler imaging of a southern ApSi star HD 152564
I. Potravnov, T. Ryabchikova, N. Piskunov +2
We present the results of the spectroscopic study of a chemically peculiar star HD 152564. Using medium-resolution () observations obtained with the HRS spectrograph mount…
Non-LTE abundance analysis of A-B stars with low rotational velocities. II. Do A-B stars with normal abundances exist?
A. M. Romanovskaya, T. A. Ryabchikova, Yu. V. Pakhomov +2
We present chemical composition and fundamental parameters (the effective temperature, surface gravity and radius) for four sharp-lined A-type stars Gem (HD 41705), o Peg (HD 2…
The Spectrum and Energy Levels of the Low-lying Configurations of Nd III
Milan Ding, Juliet C. Pickering, Alexander N. Ryabtsev +2
Emission spectra of neodymium (Nd, Z=60) were recorded using Penning and hollow cathode discharge lamps in the region 11500-54000 cm (8695-1852 Å) by Fourier transform spect…
BD+30549: young helium-weak silicon star in NGC 1333 star-forming region
I. Potravnov, L. Mashonkina, T. Ryabchikova
We present results of the spectroscopic study of the chemically peculiar star BD+30549 which is bona-fide member of young NGC 1333 star forming region. We found that the st…
Using Molecular Lines to Determine Carbon and Nitrogen Abundances in the Atmospheres of Cool Stars
T. Ryabchikova, N. Piskunov, Y. Pakhomov
Simultaneous analysis of the C_2 and CN molecular bands in the 5100-5200 and 7930-8100A spectral regions is a promising alternative for the accurate determination of the carbon (C)…