Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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CCD PHOTOMETRY USING MULTIPLE COMPARISON STARS

  • Kim, Yong-gi (University Observatory, Chungbuk National University, Institute for Basic Science Research, Chungbuk National University) ;
  • Andronov, Ivan L. (University Observatory, Chungbuk National University, Department of Astronomy, Odessa National University T. G. Shevchenko Park, Crimean Astrophysical Observatory) ;
  • Jeon, Young-Beom (Korea Astronomy Observatory)
  • Published : 2004.09.01
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Abstract

The accuracy of CCD observations obtained at the Korean 1.8m telescope has been studied. Seventeen comparison stars in the vicinity of the cataclysmic variable BG CMi have been measured. The 'artificial' star has been used instead of the 'control' star, what made possible to increase accuracy estimates by a factor of 1.3-2.1 times for 'good' and 'cloudy' nights, respectively. The algorithm of iterative determination of accuracy and weights of few comparison stars contributing to the artificial star, has been presented. The accuracy estimates for 13-mag stars are around $0.^m002$ mag for exposure times of 30 sec.

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References

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