Перегляд за Автор "Chekhonadskikh, F. A."

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  • Ескіз
    Документ
    Investigation of diffuse interstellar bands of organic molecules in the spectra of cepheid stars
    (Одеський національний університет імені І. І. Мечникова, 2015) Kashuba, S. V.; Andrievsky, Serhii M.; Chekhonadskikh, F. A.; Korotin, S. A.; Kovtyukh, Valery V.; Luck, R. E.; Андрієвський, Сергій Михайлович; Андриевский, Сергей Михайлович
    We describe an effective method of investigation of the Diffuse Interstellar Bands (DIBs) in the spectra of Cepheid stars. DIBs are believed to originate from the absorption of such carriers as polycyclic aromatic hydrocarbons in the interstellar gaseous clouds located between an observer and the stars whose spectra were recorded. We performed a detailed consideration of the DIB at 6613 A in our sample of spectra for more than 250 stars. The quantitative characteristics of the DIB absorption features will be studied in connection with the interstellar absorption data, and after that, they will be used in the mapping of the Galactic disc.
  • Ескіз
    Документ
    THE ABUNDANCES OF THE ELEMENTS OF THE MAGELLANIC CLOUDS
    (Astroprint, 2010) Chekhonadskikh, F. A.
    The results of the spectroscopic researches of classical Chepheids of the Magellanic Clouds (MC) are presented in this paper. 21 spectra for the Large Magellanic Cloud (LMC) and 10 for the Small Magellanic Cloud (SMC) were investigated. I obtained highly accurate values of e ective temperatures (Teff ), of the logarithm of the surface gravity(log g), of the microturbulence velocity (Vt), of abundances of elements for all of the objects. There is a good agreement with previous studies, some data were obtained for the rst time.
  • Ескіз
    Документ
    THE STUDY OF GALACTIC BEAT CEPHEIDS WITH APPLICATION OF ITS RESULTS TO THOSE IN THE MAGELLANIC CLOUDS
    (Astroprint, 2014) Chekhonadskikh, F. A.; Kovtyukh, Valery V.; Belik, S. I.
    A thorough study of the correlation between P1=P0 ratio, fundamental period, and chemical composition (abundances of metals that compose Z) was conducted to investigate the significance of the iron-peak elements on the ratio. The results suggested a more accurate P1=P0 ratio that can be useful as an alternative means of determining a beat Cepheid’s metallicity. Metallicities for a large sample of stars were analysed using the suggested ratio. The metallicity distribution function for the Magellanic Clouds projected on the celestial sphere was constructed for the first time, and several stars with anomalous metallicities were detected. The average metallicities of the Magellanic Clouds were also obtained independently: –0.30 dex for the Large Magellanic Cloud (LMC) and –0.49 dex for the Small Magellanic Cloud (SMC). The [Fe=H] values for two newly-found bimodal Cepheids in the Galactic bulge were estimated: –0.39 dex for OGLE-BLG-CEP-03 and –0.29 dex for OGLE-BLG-CEP-21.