Flux Calibration of the BATC Survey and Its Application for checking the Consistency of the Oke-Gunn Standards

Details Flux Calibration of the BATC Survey and Its Application for checking the Consistency of the Oke-Gunn Standards Flux Calibration of the BATC Survey and Its Application for checking the Consistency of the Oke-Gunn Standards

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chjaa...1..372z&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 1, pp. 372-382

Astronomy and Astrophysics

Astrophysics

53

Techniques: Photometric: Calibration

Scientific paper

Four Oke-Gunn (OG) standards, HD 19445, HD 84937, BD+26 2606 and BD+17 4708 are used as standard stars for flux calibration in the BATC project. They are also widely used in the visual wavelength region in many other photometric projects. Over the years we have observed on 58 good photometric nights, and the data obtained are used for flux calibration. Normally two or three OG standards are observed in every photometric night. The data are used for getting the atmospheric extinction coefficients and strumental magnitude zero point. We also use these data to make inter-comparisons among the magnitudes of these standard stars. As a result, we found the magnitudes of HD 19445, HD 84937 and BD+17 4708 to agree well with those estimated in previous work to within 0.03 magnitude. However, BD+26 2606 shows a larger deviation especially at short wavebands. Possible reasons are analyzed and the revised magnitudes are obtained for these standards. It is shown that the quality of flux calibration of the BATC fields is significantly improved by applying the new magnitudes.

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