CCD Photometry Using Multiple Comparison Stars

Details CCD Photometry Using Multiple Comparison Stars CCD Photometry Using Multiple Comparison Stars

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jass...21..191k&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 21, no. 3, p.191-200

Astronomy and Astrophysics

Astronomy

7

Data Analysis, Ccd Photometry, Bg Cmi.

Scientific paper

The accuracy of CCD observations obtained at the Korean 1.8 m 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 0.002 m mag for exposure times of 30 sec.

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