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中文摘要：
积分时间对CCD测光结果的误差有很大影响。利用云南天文台1m望远镜对BLLac天体ON231进行了I波段不同积分时间的观测,获得了I波段BLLac天体ON231CCD测光积分时间与测光误差的关系。结果表明,当BLLac天体ON231处于低态时,在I波段的最佳积分时间约为294s,此时测光误差最小。
英文摘要：
In the CCD photometry the integration time significantly affects the photometric error. We used the 1 m telescope of the Yunnan Observatory to observe the BL Lac object ON231 at the I band in different integration times, from 20s to 470s in an incrementing sequence with a lOs interval. All the images were reduced by using the CCDRED and APPHOT tasks in the IRAF software package, resulting in a total of 46 datapoints. We also analyzed the light curve of ON231 and found it in a low state with no variation during our observation time. We obtained the relations between integration time and photometric error of ON231 and two standard stars at the I band. We apply the polynomial fit to the relation of ON231, and calculate the optimal integration time （corresponding to the minimum photometric error）. The optimal integration time for ON231 at the low state at the I band is about 294s.
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同项目期刊论文
：Zhang X, Fermi gamma-ray and multi-wave band emission from T eV active galactic nuclei , 2012，AP&am
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