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Title Fast photometric variability in the Be/X-ray binary system : GRO J2058+42
Author Ψαράκης, Χαράλαμπος
Thesis advisor Reig, Pablo
Abstract Aims. I present a photometric analysis of short-term (4 days) optical monitoring observations of the optical counterpart to the Be/X-ray binary GRO J2058+42. The purpose of this analysis is to search for variabilities in the light curve of the Be star, and then, determine whether the variabilities are due to pulsation, or due to rotation. Methods. I performed optical photometric observations in the V band of the Be/X-ray binary GRO J2058+42 and several secondary standard stars near the target within the 9 arcmin field of view. The final light curve was obtained through differential photometry between the source and the average of the most stable standard stars. The reduction of the data was done by using IRAF while the frequency analysis was used with PERIOD04. Results. The timing analysis resulted in the detection of three significant frequencies at 2.64 c d-1, 2.41 c d-1 and 3.99 c d-1, which i attribute to non-radial pulsations. Conclusion. The three frequencies cannot be explained by rotation of hot spots on the surface of the Be star and can only be attributed to non-radial pulsations.
Language English
Issue date 2021-03-24
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
  Type of Work--Graduate theses
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