Перегляд за Автор "Klochkova, V. G."

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  • Ескіз
    Документ
    H a LINE AS AN INDICATOR OF ENVELOPE PRESENCE AROUND THE CEPHEID POLARIS Aa ( UMi)
    (Astroprint, 2015) Usenko, I. A.; Miroshnichenko, A. S.; Klochkova, V. G.; Tavolzhanskaya, N. S.
    We present the results of the radial velocity (RV ) measurements of metallic lines as well as H (H ) obtained in 55 high-resolution spectra of the Cepheid UMi (Polaris Aa) in 1994–2010. While the RV amplitudes of these lines are roughly equal, their mean RV begin to differ essentially with growth of the Polaris Aa pulsational activity. This difference is accompanied by the H core asymmetries on the red side mainly (so-called knifelike profiles) and reaches the value of 8–12 km/s in 2003 with subsequent decrease to 1.5–2 km/s. We interpret so unusual behaviour of the H line core as dynamical changes in the envelope around Polaris Aa.
  • Ескіз
    Документ
    Three giants – members of The Open cluster M 67
    (Одеський національний університет імені І. І. Мечникова, 2017) Mishenina, T. V.; Klochkova, V. G.; Panchuk, V.; Basak, N. Yu.; Kovtyukh, Valery V.; Korotin, S. A.; Velichko, A.
    We determined the atmospheric parameters and chemical composition of the three giants, which are members of the open cluster M 67. The high resolution spectra (R = 60 000) were obtained with the echelle spectrograph NES mounted on the 6-meter telescope of the SAO RAS Obtained variations in Na and Zr abundances are within the determination errors. The Li abundance suggest a depletion of Li in the course of stellar evolution. For studied giants, the iron abundances derived from the neutral and ionized iron lines have not shown any significant discrepancies. The [Ba/Fe] values are close to the solar ones.