Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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TWO-COLOR VR CCD PHOTOMETRY OF THE INTERMEDIATE POLAR `RXS J062518.2+733433

  • Kim, Yong-Gi (University Observatory, Chungbuk NAtional University, Institute for Basic Science Research, Chungbuk National University) ;
  • Andronov Ivan L. (Department of Astronomy and Astronomical Observatory, Odessa National University, Crimean Astrophysical Observatory, University Observatory, Chungbuk National University) ;
  • Park, Sung-Su (University Observatory, Chungbuk National University) ;
  • Chinarova Lidia L. (Department of Astronomy and Astronomical Observatory, Odessa National University) ;
  • Baklanov Alexey V. (Department of Astronomy and Astronomical Observatory, Odessa National University) ;
  • Jeon, Young-Beom (Korea Astronomy and Space Science Institute)
  • Published : 2005.09.01
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Abstract

Results of 7 nights of CCD VR photometry of the intermediate polar 1RXS J062518.2+733433 obtained at the Korean 1.8m telescope are reported. The corrected ephemeris for the orbital minimum is BJD (Orb.min) = 2453023.6159(42)+0.1966431(33) (E-1735). The corrected ephemeris for the spin maximum is BJD (spin max) = 2452893 78477 (10)+0.01374116815 (17) (E-15382) (cycle numbering corresponds to that of Staude et al.2003). The variations of the shape of the individual spin variations are highly correlated in V and R. The phase of the spin maximum is found to be dependent on the orbital phase. The corresponding semi-amplitude of sinusoidal variations of phase is $0.11{\pm}0.03.$ This new phenomenon is explained by the changing viewing conditions of the accreting magnetic white dwarf, and should be checked in further observations this star and for other intermediate polars. To avoid influence of this effect on the analysis of the long-term spin period variations, the runs of at least one orbital period are recommended. Results of time series analysis are presented in tables.

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