A STATISTICAL ANALYSIS OF THE ACCURACY OF THE DIGITIZED MAGNITUDES OF PHOTOMETRIC PLATES ON THE TIMESCALE OF DECADES WITH AN APPLICATION TO THE CENTURY-LONG LIGHT CURVE OF KIC 8462852
A STATISTICAL ANALYSIS OF THE ACCURACY OF THE DIGITIZED MAGNITUDES OF PHOTOMETRIC PLATES ON THE TIMESCALE OF DECADES WITH AN APPLICATION TO THE CENTURY-LONG LIGHT CURVE OF KIC 8462852
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光度板数字化幅度在数十年时间尺度上的准确性统计分析及其应用于KIC 8462852的百年光曲线
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发表时间：
2016
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通讯作者：
K. Stassun
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作者：
M. Hippke;D. Angerhausen;M. Lund;J. Pepper;K. Stassun
我们提出了一个统计分析的精度的数字化星等的光度板的时间尺度上的几十年。在我们对来自哈佛大学DASCH档案馆的存档约翰逊B光度学的检查中，我们发现对于所有校准，在B范围9-17内光变曲线的中值均方根散射为0.15 mag。对于大多数恒星来说，轻微的潜在系统学（趋势或通量不连续性）是在每世纪（1889-1990年）0.2等的水平上。这些历史数据可以明确地用于发生在量级上的过程，并且在接近噪声基底的情况下需要仔细检查。这些限制在光度稳定性的表征可能会指导未来的研究，在他们使用的板档案。我们解释了这些限制的例子KIC 8462852，这已被称为0.16马格每世纪暗淡的情况下，并表明，这种趋势不能被视为显着。
We present a statistical analysis of the accuracy of the digitized magnitudes of photometric plates on the timescale of decades. In our examination of archival Johnson B photometry from the Harvard DASCH archive, we find a median rms scatter of light curves of the order of 0.15 mag over the range B ∼ 9–17 for all calibrations. Slight underlying systematics (trends or flux discontinuities) are on a level of ≲0.2 mag per century (1889–1990) for the majority of constant stars. These historic data can be unambiguously used for processes that happen on scales of magnitudes, and need to be carefully examined in cases approaching the noise floor. The characterization of these limits in photometric stability may guide future studies in their use of plate archives. We explain these limitations for the example case of KIC 8462852, which has been claimed to dim by 0.16 mag per century, and show that this trend cannot be considered as significant.