The Stability of BVRI Comparison Stars Near Selected TeV Blazars
The Stability of BVRI Comparison Stars Near Selected TeV Blazars
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BVRI 比较恒星在选定 TeV 耀变体附近的稳定性
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Bret Little
中科院分区：
文献类型：
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作者：
C. Pace;R. Pearson;J. Ward Moody;M. Joner;Bret Little
我们测量了5TeV耀变体附近的比较星的约翰逊BV星等和约翰逊RI星等。我们将我们的值与公布的值进行比较，在某些情况下跨越25年，以确定那些最有可能被证明稳定的恒星。为了避免零点偏移模拟长期变异性，我们将我们的分析建立在去除数据集之间的平均偏移后的测量值之间的标准差上。我们发现大多数恒星稳定在0.04等的水平。我们确认两颗恒星是变星，并确定另外两颗可能是变星。在这五个区域中，每一个区域都至少有两颗恒星，通常更多，没有显示出变化的证据。
We have measured Johnson BV and Cousins RI magnitudes for comparison stars near 5 TeV blazars. We compare our values with published values, spanning 25 years in some cases, to identify those stars that are most likely proven stable. To avoid zero-point offsets mimicking long-term variability, we based our analysis on the standard deviation between measurements after a mean offset between data sets was removed. We found most stars to be stable at the 0.04 mag level. We confirm two stars as variable and identify two others as possibly being variable. In each of the five fields there are at least two stars, and typically many more, that show no evidence of variability.