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  1. No Access

    Article

    Non-LTE effects in Mg I lines for various types of stars

    We have performed a detailed statistical-equilibrium analysis based on a 49-level model of the magnesium atom for the atmospheres of stars of various spectral types: T eff=4500–12000 K, logg=0.0–4.5, and [M/H]=0 ...

    N. N. Shimanskaya, L. I. Mashonkina, N. A. Sakhibullin in Astronomy Reports (2000)

  2. No Access

    Article

    Revised magnesium abundances in galactic halo and disk stars

    A differential analysis of the magnesium abundances in 61 F-K dwarfs and subgiants with metallicities −2.6<[Fe/H]<+0.2 is performed based on published observational data. Fundamental parameters for 36 stars ar...

    N. N. Shimanskaya, L. I. Mashonkina in Astronomy Reports (2001)

  3. No Access

    Article

    The impact of reflection effects on the parameters of the old pre-cataclysmic variables MS Peg and LM Com

    We have determined the main parameters of the old precataclysmic variable stars MS Peg and LM Com. The radial velocities of the components, reflection effects in the spectra, and light curves of the systems ar...

    V. V. Shimansky, N. V. Borisov, N. N. Shimanskaya in Astronomy Reports (2003)

  4. No Access

    Article

    Observational constraints on potassium synthesis during the formation of stars of the Galactic disk

    The non-LTE potassium abundances in the atmospheres of 33 Galactic-disk stars are derived and the parameters of the atmospheres of 23 of the stars are determined. Neglecting departures from LTE results in a sy...

    V. V. Shimansky, I. F. Bikmaev, A. I. Galeev, N. N. Shimanskaya… in Astronomy Reports (2003)

  5. No Access

    Article

    Analysis of the FF Aqr spectra

    We determine the atmospheric parameters of the secondary in the close binary system FF Aqr and analyze its chemical composition. A series of high-resolution spectra are taken at different orbital phases using ...

    N. N. Shimanskaya, I. F. Bikmaev, V. V. Shimansky in Astrophysical Bulletin (2011)

  6. No Access

    Article

    Analysis of spectra of V471 Tau and HD 115404

    We analyze the chemical composition of the atmospheres of a single K-type star HD 115404 and the secondary component of the V471 Tau variable. We use the technique of modeling of synthetic spectra to analyze t...

    V. V. Shimansky, I. F. Bikmaev, N. N. Shimanskaya in Astrophysical Bulletin (2011)

  7. No Access

    Article

    Observations of eclipses of UU Sge

    We have performed spectroscopy and photometry of eclipses of the pre-cataclysmic variable UUSge using the 6-m telescope of the Special AstrophysicalObservatory and the 1.5-mRussian-Turkish telescope. Our analy...

    V. V. Shimansky, N. V. Borisov, I. F. Bikmaev, N. N. Shimanskaya in Astronomy Reports (2012)

  8. No Access

    Article

    Non-LTE effects in Al I lines

    We present the theoretical analysis of the Al I line formation in the spectra of late-type stars ignoring the assumption of local thermodynamic equilibrium (LTE). The calculations were based on the 39-level al...

    V. S. Menzhevitski, V. V. Shimansky, N. N. Shimanskaya in Astrophysical Bulletin (2012)

  9. No Access

    Article

    Analysis of optical spectra of V1357 Cyg≡Cyg X-1

    Optical spectra and light curves of the massive X-ray binary V1357 Cyg are analyzed. The calculations were based on models of irradiated plane-parallel stellar atmospheres, taking into account reflection of th...

    V. V. Shimanskii, E. A. Karitskaya, N. G. Bochkarev… in Astronomy Reports (2012)

  10. No Access

    Article

    PG 1316+678: A young pre-cataclysmic binary with weak reflection effects

    The PG 1316+678 star is classified as a pre-cataclysmic binary, as is evidenced by its photometric and spectroscopic observations. Its orbital period is determined to be P orb = 3.3803d, which coi...

    V. V. Shimansky, N. V. Borisov, I. F. Bikmaev, N. A. Sakhibullin… in Astronomy Reports (2013)

  11. No Access

    Article

    Observational restrictions on sodium and aluminium abundance variations in evolution of the galaxy

    In this paper we construct and analyze the uniform non-LTE distributions of the aluminium ([Al/Fe]-[Fe/H]) and sodium ([Na/Fe]-[Fe/H]) abundances in the sample of 160 stars of the disk and halo of our Galaxy w...

    V. S. Menzhevitski, N. N. Shimanskaya, V. V. Shimansky… in Astrophysical Bulletin (2013)

  12. No Access

    Article

    Effect of atomic parameters on determination of aluminium abundance in atmospheres of late-type stars

    We study the effect of the photoionization cross sections for the ground state of Al I on the inferred aluminium abundance in stellar atmospheres. We match the theoretical and observed line profiles of the res...

    V. S. Menzhevitski, N. N. Shimanskaya, V. V. Shimansky… in Astrophysical Bulletin (2014)

  13. No Access

    Article

    Analysis of the Spectroscopic Observations of RS CVn Type Star V837 Tau

    We present an analysis of the spectra of the star V837 Tau, which belongs to a class of chromosphere-active RSCVn type stars. The observational material was obtained with the 1.5-m Russian-Turkish telescope RT...

    A. I. Kolbin, V. V. Shimansky, I. Yu. Alekseev, N. N. Shimanskaya… in Astrophysical Bulletin (2019)

  14. No Access

    Article

    Analysis of Integrated-Light Spectra of Galactic Globular Clusters

    We present the results of determination of the age, helium mass fraction (Y), metallicity ([Fe/H]), and abundances of the elements C, O, Na, Mg, Ca, Ti, Cr and Mn for 26 globular clusters of the Galaxy. In this w...

    M. E. Sharina, V. V. Shimansky, N. N. Shimanskaya in Astrophysical Bulletin (2020)