Перегляд за Автор "Keir, Leonid E."

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  • Ескіз
    Документ
    Astrometry of NASA Lucy mission targets (617) Patroclus, (3548) Eurybates, and (21900) Orus at opposition 2021
    (Odesa I. I. Mechnikov National University, 2024) Troianskyi, Volodymyr V.; Okhotko, Hanna K.; Kashuba, Volodymyr I.; Udovichenko, Serhii M.; Keir, Leonid E.; Romanyuk, Ya.; Savanevych, V.; Khlamov, S.; Briukhovetskyi, A.; Zhukov, V.; Lishchynskyi, I.; Poplavskyi, O.; Trunova, T.; Троянський, Володимир Володимирович; Охотко, Ганна Костянтинівна; Кашуба, Володимир Іванович; Удовіченко, Сергій Миколайович; Кейр, Леонід Едуардович; Романюк, Я.; Саваневич, В.; Хламов, С.; Брюховецький, О.; Жуков, В.; Ліщинський, І.; Поплавський, О.; Трунова, Т.
    In this paper we present the result of the combined use of the OMT-800, AZT-3, KIT telescopes, and the Lemur software of the CoLiTec project. The paper considers in detail several of the astrometric observations of Jupiter Trojan asteroids: (617) Patroclus, (3548) Eurybates, and (21900) Orus from a long list of small bodies of the Solar System.
  • Ескіз
    Документ
    A new approach to the analysis of light curves of pulsating RR Lyrae stars with the Blazhko effect
    (Одеський національний університет імені І. І. Мечникова, 2023) Keir, Leonid E.; Кейр, Леонід Е.
    We discuss the new approach for the analysis of the long-term dense series of observations of RR Lyr-type pulsating stars with the Blazhko effect. The standard way, namely The frequency analysis of the O–C values for the times of maxima does not allow for to detection of the complex nature of the periodic changes in the shape of the light curves, including bi-cyclicity. We have shown the perspectives of a new approach on the example of the analysis of FISge variable observations containing a total of 55 observational nights during a period of five years (AZT-3 Telescope, Mayaki Observational Station, SRI “Astronomical Observatory”, I.I. Mechnikov ONU). ThestudyisbasedonthedataobtainedbyS.N.Udovichenko during the 2013 and 2014 observational seasons as well as on data obtained by S.N. Udovichenko and the author during the 2018 observational season. Our results show that in order to understand the features in the shape of the light curve variations for RR Lyr type pulsating stars with the Blazhko effect, it is necessary to have data for full cycles of variability over a long time, and not just the moments of maxima.
  • Ескіз
    Документ
    The R-band observations and comparison with results in the V-band of FI Sge
    (Odesa I. I. Mechnikov National University, 2024) Keir, Leonid E.; Udovichenko, Serhii M.; Кейр, Леонід Едуардович; Удовіченко, Сергій Миколайович
    We present the result of the processing of our observations of the FI Sge, the pulsating RR Lyrae type variable with the Blazhko effect in the R-band. The data were obtained during 36 nights in 2018 as well as during 13 nights in 2021. We used the period and initial epoch obtained from our observations in V-band. We confirmed the presence of the Blazhko effect, the bi-cyclicity effect, and also the effect of discrete displacement of the light curves along the phase curve detected firstly in the V-band. We detect some differences in the dynamic of the light curve variability in different photometrical bands, possibly related to the Blazhko effect.