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  1. 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)

  2. 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)

  3. 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)

  4. 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)

  5. 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)

  6. 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)

  7. 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)