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Investigation of Spectral Characteristics and Statistical Properties of Flicker Noise of the X-Ray Nova A0620-00

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Abstract

Methodological studies of spectral characteristics and statistical analysis of flicker noise are presented on the example of two data samples (2016–2017) on the X-ray nova A0620-00. The results obtained indicate the nature of flicker noise as aperiodic phenomenon in stellar atmospheres and in regions of interaction between stars in binary systems, including phenomena of a flare nature. We showed that flicker noise is described by distributions of non-negative random variables: gamma distribution and Weibull distribution, which makes it related to atmospheric processes in meteorology and geological processes (earthquakes). Modeling of these processes shows structural correspondence to real data (Hurst diagrams), and also indicates the presence of additional unaccounted for noise of a presumably Gaussian nature. The performed studies give recommendations to supplement the models of the light curves of binary astrophysical systems with the gamma distribution and the Weibull distribution.

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ACKNOWLEDGMENTS

The authors are grateful to N.A. Katysheva and S.Yu. Shugarov for the data provided and helpful discussions.

Funding

A.M. Cherepashchuk thanks the Russian Scientific Foundation (project no. 17-12-01241) for the support. I.I. Bulygin thanks the “Traektoria” Foundation. The research was carried out with the support of the Interdisciplinary Scientific and Educational School of Moscow University “Fundamental and Applied Space Research.”

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Authors and Affiliations

  1. Lomonosov Moscow State University, Physics Department, 119234, Moscow, Russia

    O. S. Sazhina, I. I. Bulygin & A. M. Cherepashchuk

  2. Lomonosov Moscow State University, Sternberg Astronomical Institute, 119991, Moscow, Russia

    O. S. Sazhina & A. M. Cherepashchuk

  3. Astrophysical School “Traektoria”, Moscow, Russia

    I. I. Bulygin

Authors
  1. O. S. Sazhina
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  2. I. I. Bulygin
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  3. A. M. Cherepashchuk
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Correspondence to O. S. Sazhina.

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Translated by E. Seifina

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Sazhina, O.S., Bulygin, I.I. & Cherepashchuk, A.M. Investigation of Spectral Characteristics and Statistical Properties of Flicker Noise of the X-Ray Nova A0620-00. Astron. Rep. 65, 839–863 (2021). https://doi.org/10.1134/S1063772921090067

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  • DOI: https://doi.org/10.1134/S1063772921090067

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