40 Result(s)

Article

The Program Magreg for Determining the Longitudinal Component of Stellar Magnetic Fields from Spectropolarimetric Observations

The computer program magreg in IDL language has been developed for determining the longitudinal component Bz of the magnetic field of stars. The program has been tested on observations of a number of objects a...

I. S. Savanov in Astrophysics (2020)

Article

Astrophysical Space Mission Astron-2 for an All-Sky Survey in the Ultraviolet Spectral Domain

This paper presents the project of the space astrophysical observatory Astron-2 aimed to carry out the all-sky spectral and photometric survey in the ultraviolet spectral region (115–310 nm). The major instrum...

M. E. Sachkov, I. S. Savanov, B. M. Shustov, A. S. Shugarov… in Solar System Research (2019)

Article

Activity of the Star bScl Observed by the TESS Space Telescope

The rotational and flare activity of the chemically peculiar star B9.5IIIpHgMnSi βScl is studied using data from the archive of the TESS space mission. Rotational modulation of the brightness is clearly visibl...

I. S. Savanov in Astrophysics (2019)

Article

Activity of the Red Dwarf FR Cnc from Observations with a Robotic IRT-20 Telescope at the Zvenigorod Observatory of INASAN

We present the results of our new photometric observations of the chromospherically active star FR Cnc performed with a robotic telescope at the Zvenigorod Observatory of INASAN in March 2019. The observations...

I. S. Savanov, S. A. Naroenkov, M. A. Nalivkin, J. C. Pandey… in Astronomy Letters (2019)

Article

Activity of the Star ET Dra

V-band photometric observations of the FK Com type star ET Dra were made at the Zvenigorod observatory (INASAN) during March-April 2018. The new data were used in a solution of the inverse problem of recoverin...

I. S. Savanov, S. A. Naroenkov, M. A. Nalivkin, 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

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

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

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

Superlithium HD9746 – A Brilliant Case of NLTE in Stellar Spectra

Ya. Pavlenko, L. Yakovina, I.S. Savanov in Astrophysics and Space Science (1999)

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

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

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)

Chapter and Conference Paper

Is ξ Boo AB a young or an evolved system? a model atmosphere analysis

We perform a model atmosphere analysis of ξ Boo A, and make estimates for the secondary component. The abundances of 25 elements for ξ Boo A are obtained with the parameters: T _eff=(5300 ± 100) K, log g= 4.1 ± 0....

I. S. Savanov in The Sun and Cool Stars: activity, magnetism, dynamos (1991)

Chapter and Conference Paper

Spectroscopic analysis of HR 1099

We have calculated synthetic spectra for HR 1099 for the wavelenffth region λ6425-6445 Å, which includes the CaI λ6439 Å and Fel λ6430 Å lines, often used for the surface imaging of rapidly rotating late-type ...

I.S. Savanov, I. Tuominen in The Sun and Cool Stars: activity, magnetism, dynamos (1991)

Article

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

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

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

Thorium abundance in the atmospheres of Am stars

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

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)