47 Result(s)

Article

The chemical composition of the atmospheres, the masses, radii, and other parameters of four Am stars

L. S. Lyubimkov, I. S. Savanov in Astrophysics (1983)

Article

Thorium abundance in the atmospheres of Am stars

L. S. Lyubimkov, I. S. Savanov in Astrophysics (1985)

Article

Determination of the uranium abundance in the Ap star 73 Dra using the line U II λ 3859.58

I. Kh. Iliev, L. S. Lyubimkov, I. S. Savanov in Astrophysics (1986)

Article

Element abundances in the atmosphere of the chemically peculiar star β Cr B

I. S. Savanov, V. P. Malanushenko in Astrophysics (1990)

Article

Possible presence of magnetic fields and iron content of atmospheres of “Metallic” Am-stars

Measurements with a CCD camera were made of two Fell lines at λ=6747.7 Å and 6149.2 Å in the spectra of 12 Am stars. The greater line strength of Fell λ 6147.7 Å relative to that of λ 6149.2 Å can be taken as .....

I. S. Savanov in Astrophysics (1994)

Article

Magnetic fields and the abundance of iron at the surface of late-type dwarfs

A program package developed for implementation of the Stenflo-Lindegren method for investigation of magnetic fields with complex structure is described. It has been used to carry out magnetic field diagnostics...

I. S. Savanov, Yu. Yu. Savel'eva in Astrophysics (1996)

Article

The "F str 4077" star HD 177645 as a possible barium dwarf star

The abundances of 12 elements in the atmosphere of the "F str 4077" star HD 177645 have been determined from new spectroscopic observations with the CCD camera and the model atmosphere method. The overabundanc...

I. S. Savanov in Astrophysics (1996)

Article

Vertical Chromium Distribution in the Atmosphere of a Chemically Peculiar Star. I. Diagnostics

On the basis of CCD spectrograms obtained with high resolution at the Coudé focus of the 2.6-m telescope of the Crimean Astrophysical Observatory, Cr II lines lying in the wings of the Hβ hydrogen line are inv...

I. S. Savanov, O. P. Kochukhov, V. V. Tsymbal in Astrophysics (2001)

Article

Vertical Chromium Distribution in the Atmospheres of CP Stars. II. Modeling

Vertical chromium distributions in the atmospheres of several Ap and Am stars are fitted using detailed modeling of the profiles of CrII lines. The vertical distributions obtained for Ap stars are consistent w...

I. S. Savanov, O. P. Kochukhov, V. V. Tsymbal in Astrophysics (2001)

Article

A study of the magnetic field in FK Com

We present the results of our new spectropolarimetric observations of FKCom aimed to measure the longitudinal component B _z of its magnetic field. The most inte...

V. B. Puzin, I. S. Savanov, I. I. Romanyuk, E. A. Semenko… in Astrophysical Bulletin (2014)

Article

A study of cold spots on the surfaces of stars with planetary systems from the Kepler space telescope data

Based on the photometric observations obtained with the Kepler telescope, we investigated the properties of the active regions (cold spots) on the surfaces of 737 stars with planetary systems (exoplanets). We ...

I. S. Savanov in Astrophysical Bulletin (2015)

Article

Activity and cold spots on the surface of G-type superflare stars

Based on the high precision photometric observations of the Kepler space telescope, we have investigated the properties of the active regions (cold spots) on the surface of 279 stars of the spectral class G, f...

I. S. Savanov in Astrophysical Bulletin (2015)

Article

Parameters of superflares on G-Type stars observed with the Kepler space telescope

We continued the analysis of 279 G-type stars with superflares (energies in the range of 10³³–10³⁶ erg). We calculated the SFL parameter (part of the stellar surface which emits in the flare). The SFL estimates w...

I. S. Savanov, E. S. Dmitrienko in Astrophysical Bulletin (2016)

Article

Spots and activity cycles of the star FKCom—2013–2015 data analysis

We present an analysis of new photometric and spectropolarimetric observations of a chromospherically active star FKCom. Based on this observational data and the data from the literature sources, applying a co...

V. B. Puzin, I. S. Savanov, E. S. Dmitrienko, I. I. Romanyuk… in Astrophysical Bulletin (2016)

Article

Photometric Observations of LO Peg in 2017

New observations of the ultrafast rotator of the K3 spectral type, the star LO Peg, were carried out using a robotic wide-angle observation system in the Zvenigorod observatory of INASAN in 2017. Temperature-i...

I. S. Savanov, S. A. Naroenkov, M. A. Nalivkin, V. B. Puzin… in Astrophysical Bulletin (2018)

Article

On the Differential Rotation of Stars

We discussmethods for analyzing the observational manifestations of differential rotation (DR). Based on the literary sources and our estimates (for 4 cool dwarfs), a list containing 75 stars was compiled. Usi...

I. S. Savanov, E. S. Dmitrienko, D. S. Pandei, S. Karmakar in Astrophysical Bulletin (2018)

Article

Long-Term Variability in the Magnetic Field of the Ap Star γ Equ

New measurements of the longitudinal magnetic field of the Ap star γ Equ obtained with the MSS spectrograph of the 6-m telescope of the SAO RAS in 2002–2018 are present. Analyzing our results together with all...

I. S. Savanov, I. I. Romanyuk, E. S. Dmitrienko in Astrophysical Bulletin (2018)

Article

Brightness Variability of 12 ROTD A-Stars

The brightness variability of 12 stars of spectral class A which are type ROTD objects is analyzed. The power spectra of these objects contain characteristic features including a amplitude-dominant narrow peak...

I. S. Savanov, E. S. Dmitrienko in Astrophysics (2019)

Article

Areas, Lifetimes, and Magnetic Fields of Starspots

The results of applying a method developed by us for determining the spottedness parameter A to data on the brightness variation of 34030 objects based on observations with the Kepler space telescope are prese...

I. S. Savanov in Astrophysics (2019)

Article

KIC7739728—A New FK Com-Type Star Candidate

We present a study of the parameters of objects belonging to a sparsely populated group of FKCom-type stars, as well as a brief review of our earlier studies dedicated to the search for stellar candidates of t...

I. S. Savanov in Astrophysical Bulletin (2019)